Jet Tools Cordless Sander J 4200A User Manual

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Operating Instructions and Parts Manual

Disc, Belt and Combination Disc/Belt Sanders

Models: J-4200A

J-4200A-2

J-4300A

J-4301A

J-4400A

J-4401A

J-4202A

J-4200A Disc/Belt Sander

J-4300A Belt Sander

J-4400A Disc Sander

WALTER MEIER (Manufacturing) Inc.

427 New Sanford Road

LaVergne, Tennessee 37086

Ph.: 800-274-6848

Part No. M-414551

Revision B1 01/2013

www.waltermeier.com

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2.0 Table of contents

Section

Page

1.0 Warranty and Service.....................................................................................................................................2

2.0 Table of contents............................................................................................................................................3

3.0 Safety Warnings.............................................................................................................................................4

4.0 Machine and Manual Overview......................................................................................................................6

5.0 Specifications.................................................................................................................................................7

6.0 Operating instructions ....................................................................................................................................8

6.1 Belt sander....................................................................................................................................8

6.2 Adjusting the belt sander table.......................................................................................................8

6.3 Using the indexing lock handle ......................................................................................................8

6.4 Adjusting the belt sander arm ........................................................................................................8

6.5 Adjusting disc sander table............................................................................................................9

6.6 Use of the Miter Gauge .................................................................................................................9

7.0 Maintenance.................................................................................................................................................10

7.1 Belt replacement .........................................................................................................................10

7.2 Track mechanism maintenance...................................................................................................10

7.3 Installing abrasive discs...............................................................................................................11

7.4 Replacing the v-belt.....................................................................................................................11

8.0 Machine setup..............................................................................................................................................13

8.1 Basic setup .................................................................................................................................13

8.2 Disc table angle adjustment.........................................................................................................13

8.3 Disc table miter parallelism adjustment........................................................................................13

8.4 Disc table gap adjustment ...........................................................................................................14

8.5 Belt table miter slot parallelism adjustment ..................................................................................14

8.6 Belt table angle adjustment .........................................................................................................14

8.7 Adjusting or replacing the platen..................................................................................................15

9.0 Electrical connections ..................................................................................................................................15

9.1 Single phase electrical hookup ....................................................................................................16

9.2 Three phase electrical hookup.....................................................................................................16

10.0 Troubleshooting .........................................................................................................................................17

11.0 Replacement parts.....................................................................................................................................18

11.1.1 Model J-4200A Belt and Disc Sander Assembly – Exploded View...........................................18

11.1.2 Model J-4200A Belt and Disc Sander Assembly – Parts List ...................................................19

11.2.1 Model J-4300A Belt Sander Assembly – Exploded View .........................................................21

11.2.2 Model J-4300A Belt Sander Assembly – Parts List..................................................................22

11.3.1 Model J-4400A Disc Sander Assembly – Exploded View ........................................................24

11.3.2 Model J-4400A Disc Sander Assembly – Parts List.................................................................25

11.4.1 Base Assembly: All 1 Phase Models – Exploded View............................................................26

11.4.2 Base Assembly: All 1 Phase Models – Parts List.....................................................................27

11.5.1 Base Assembly: All 3 Phase Models – Exploded View............................................................28

11.5.2 Base Assembly: All 3 Phase Models – Parts List.....................................................................29

12.1 Electrical schematic – single phase ...........................................................................................................30

12.2 Electrical schematic – 3 phase...................................................................................................................31

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General Machinery Warnings

1. Always wear protective eye wear when operating

machinery. Eye wear shall be impact resistant,

protective safety glasses with side shields which

comply with ANSI Z87.1 specifications. Use of

eye wear which does not comply with ANSI Z87.1

specifications could result in severe injury from

the breakage of the eye protection.

3.0 Safety Warnings

General Cautions

- Misuse of this machine can cause serious injury.

2. Wear proper apparel. No loose clothing or jewelry

which can get caught in moving parts. Rubber

soled, nonslip, footwear is recommended for best

footing.

- For safety, the machine must be set up, used and

serviced properly.

- Read, understand and follow the instructions in the

operator’s and parts manual which was shipped

with your machine.

3. Do not overreach. Failure to maintain a proper

working position can cause you to fall into the

machine or cause your clothing to get caught —

pulling you into the machine.

When setting up the machine:

- Always avoid using the machine in damp or poorly

lighted work areas.

4. Keep the guards in place and in proper working

order. Do not operate the machine with the

guards removed.

- Always be sure the machine is securely anchored to

the floor.

5. Avoid dangerous working environments. Do not

use stationary machine tools in wet or damp

locations. Keep work areas clean and well lit.

- Always keep the machine guards in place.

- Always put the start switch in the “OFF” position

before plugging in the machine.

6. Special electrical precautions should be taken

when working on flammable materials.

When using the machine:

7. Avoid accidental starts by being sure that the

start switch is in the “OFF” position before

plugging in the machine.

- Never operate the machine with safety guards

missing.

- Always wear safety glasses with side shields (See

ANSI Z87.1)

8. Never leave the machine running while

unattended. The machine shall be shut off

whenever it is not being used.

- Never wear loose clothing or jewelry.

- Never overreach; you may slip and fall into the

machine.

9. Disconnect the electrical power before servicing,

whenever changing accessories or when general

maintenance is done on the machine.

- Never leave the machine running while unattended.

- Always shut the machine off when not in use.

When servicing the machine:

10. Maintain all machine tools with care. Follow all

maintenance instructions for lubricating and the

changing of accessories. No attempt shall be

made to modify or have makeshift repairs done to

the machine. This not only voids the warranty but

also renders the machine unsafe.

- Always unplug the machine from the electrical

power before servicing.

- Always follow the instructions in the operators and

parts manual when changing accessory tools or

parts.

11. If there is any risk of tipping or sliding, the

machinery must be anchored to the floor.

12. Secure your work. Use clamps or a vise to hold

your work, when practical. It is safer than using

your hands and it frees both hands to operate the

machine.

- Never modify the machine without consulting

Walter Meier (Manufacturing) Inc.

You — the stationary power tool user — hold the key

to safety.

13. Never brush chips away while the machine is in

operation.

Read and follow these simple rules for best results

and full benefits from your machine. Used properly,

JET machinery is among the best in design and

safety. However, any machine used improperly can

be rendered inefficient and unsafe. It is mandatory

that those who use our products be properly trained in

how to use them correctly. They should read and

understand the Operator’s and Parts Manual as well

as all labels affixed to the machine. Failure in

following all of these warnings can cause serious

injuries.

14. Keep work area clean. Cluttered areas invite

accidents.

15. Remove adjusting keys and wrenches before

turning the machine on.

16. Use the right tool. Don’t force

tool or

attachment to do a job it was not designed for.

17. Use only recommended accessories and follow

manufacturer’s instructions pertaining to them.

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18. Keep hands in sight and clear of all moving parts

and cutting surfaces.

other hazardous properties. You should always

consult the manufacturer of such materials for

instructions on sanding and handling.

19. All visitors should be kept at a safe distance from

the work area. Make your workshop completely

safe by using padlocks, master switches, or by

removing starter keys.

5. Do not force or jam the workpiece into the

sanding disc.

6. Before sanding, always allow the motor to come

up to operating speed, then check the sanding

disc for wobble, run-out, or any unbalanced

condition. If the disc is not operating accurately

and smoothly, immediately stop the motor and

make repairs before attempting any sanding

operations.

20. Know the tool you are using; its application,

limitations, and potential hazards.

General Electrical Cautions

This machine should be grounded in accordance with

the National Electrical Code and local codes and

ordinances. The work should be done by a qualified

electrician. The machine should be grounded to

protect the user from electrical shock.

7. Abrasive discs must be stored in a controlled

environment . Relative humidity should be 35% to

50% and the temperature should be between 60°

and 80° Fahrenheit. Failure to do so could cause

premature disc failure.

Wire Sizes

8. Examine the face of the sanding disc carefully.

Excessive sanding that wears down to the

backing material can tear the disc. Never use a

disc which shows backing, nicks or cuts on the

surface or edge, or damage due to creasing or

poor handling.

Caution: For circuits that are a great distance from

the electrical service box, the wire size must be

increased in order to deliver ample voltage to the

motor. To minimize power losses and to prevent

motor overheating and burnout, the use of wire sizes

for branch circuits or electrical extension cords

according to the following table is recommended:

9. When installing a new disc, be certain the disc is

accurately centered on the drive wheel. Failure to

do so could cause

condition.

serious unbalanced

Conductor AWG (American Wire Gauge) number

length

10. Always present the workpiece to the wheel while

resting the workpiece firmly on the table. Failure

to do so could result in damage to the workpiece

or throwing of the workpiece off the wheel.

240 volt lines

No. 14

120 volt lines

No. 14

0-50 feet

50-100 feet

Over 100 feet

No. 14

No. 12

No. 8

11. Safety shoes which comply with ANSI Z41.1

should be worn.

Safety Requirements for Abrasive Sanding

Machines

12. Personal hearing protection such as ear plugs or

ear muffs should be used to protect against the

effect of noise exposure.

Abrasive sanding can be hazardous to operators and

bystanders. Sanding sparks, chips and dust particles

thrown off by the sanding disc can cause serious

injury if contacted or inhaled. To avoid such injuries

you must comply with the following safety

requirements:

1. Always wear protective eyewear when operating

machinery. Eye wear shall be impact resistant,

safety glasses with side shields which comply

with ANSI Z87.1. Use of eye wear which does not

comply with ANSI Z87.1 specifications could

result in severe injury from the breakage of the

eye protection.

2. Wear leather safety gloves, arm guards, leather

aprons and safety shoes.

3. A dust collection system is recommended. The

operator should also wear a dust mask at all

times.

4. Additional precautions may be necessary for

sanding materials which are flammable or have

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4.0 Machine and Manual Overview

JET Abrasive Finishing Machines are available in three different configurations: disc, belt, and combination disc and

belt. Each configuration is a rugged, heavy-duty machine designed for maximum high production work in an industrial

environment.

The speed of stock removal and the quality of finish achieved is determined largely by the aggressiveness of the

abrasive disc or belt mounted on the machine. With very aggressive grits, these machines are typically considered

grinding machines. With very fine grits, these machines are typically considered sanding machines. Whatever you

call them, and however you use them, the instructions in this manual will help you use them safely and productively.

You will note there are several types of electrical systems available for these machines. All of these systems are

equally effective in providing power to the grinding mechanism – however, local codes and the type of environment in

which the machine is used will often be a factor in your choice of system.

Instructions in this manual assume that you are using one of the Model J-4200A Series Belt and Disc machines. If

you have a disc only, or belt only machine, you can bypass those instructions which do not apply to you.

If there are questions or comments, please contact your local supplier or Walter Meier. Walter Meier can also be

reached at our web site: www.waltermeier.com.

Retain this manual for future reference. If the machine transfers ownership, the manual should accompany it.

Read and understand the entire contents of this manual before attempting assembly or

operation! Failure to comply may cause serious injury!

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5.0 Specifications

Model

Stock No.

J-4200A

414551

J-4200A-2 414552

J-4202A

J-4300A

J-4301A

J-4400A

J-4401A

414553

414600

414601

414602

414603

J-4200A Disc/Belt Sander

J-4300A Belt Sander

J-4400A Disc Sander

Disc/Belt Sander

Belt Sander

Disc Sander

Disc:12x16-3/8 in.

(254x416mm)

Belt: 7 3/8x14 3/4 in.

(187x355mm)

7-3/8x14-3/4 in.

(187x355mm)

Table size

Table tilt

12x16-3/8 in. (254x416mm)

(both) 45° down, 20° up

45° down, 20° up

(both) 3/8x3/4 in.

(9.5x19mm)

Miter gauge groove

3/8x3/4 in. (9.5x19mm)

Disc diameter

Disc Speed

12 in. (305mm)

1960 RPM

12 in. (305mm)

1960 RPM

6-1/4x14-3/4 in.

(159x375mm)

6-1/4x14-3/4 in.

(159x375mm)

Platen size

Belt size

6x48 in. (152x1214mm)

2850 SFM

6x48 in. (152x1214mm)

2850 SFM

Belt speed

Dimensions

29x17x42-3/4 in.

(1070x725x4250mm)

(depth, W, H)

Dimensions w/platen

vertical (depth,W, H)

19x16x57-1/2 in.

(475x400x1437mm)

19x16x57-1/2 in.

(475x400x1437mm)

Dimensions w/platen

horizontal

(depth, W, H)

25-1/2x16x43 in.

(637x400x1075mm)

25-1/2x16x43 in.

(637x400x1075mm)

Model J-4200A 1 PH 1.5HP

115/220V (prewired 115V)

Model J-4400A 1 PH 1.5HP

115/230V (prewired 115V)

Model J-4300A 1 PH

1.5HP 115/230V (prewired

115V)

Model J-4200A-2 1 PH

1.5HP 220V

Motor options

Weight

Model J-4202A 3 PH 1.5HP Model J-4301A 3 PH 1.5HP Model J-4401A 3 PH 1.5HP

230V/460V (prewired 230V) 230V/460V (prewired 230V) 230V/460V (prewired 230V)

250 lbs. (113 kg.)

211 lbs. (96 kg.)

164 lbs. (74 kg.)

The specifications in this manual were current at time of publication, but because of our policy of continuous

improvement, Walter Meier (Manufacturing) Inc., reserves the right to change specifications at any time and without

prior notice, without incurring obligations.

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6.0 Operating instructions

These sanders can be used to remove stock from a

wide variety of machinable materials. Different

materials require different grit types and grades to

achieve the desired stock removal rate and surface

finish. Please consult with your abrasive materials

supplier for specific recommendations on the correct

grit material and grade required for your specific

needs.

Figure 1: Locking handle for belt table

When removing stock from soft materials (wood,

plastic, etc.) these machines are typically called

"sanders." When removing stock from hard materials

(cast iron, steel, etc.) they are referred to as

"grinders". The word "sander" is used, more-or-less

consistently, throughout this manual. It refers to the

machines and not the type of abrasive finishing being

performed.

6.3 Using the indexing lock handle

The lock handle (Figure 1) is spring loaded and can

be repositioned on its shaft to permit easy locking and

unlocking.

To Reposition the Handle:

1. Pull outward against its spring.

2. Rotate the handle to the position you require.

Before operating your sander, please read the basic

instructions on safe machine usage on the preceding

pages.

3. Release the handle and its spring will return it to

the correct operating position.

6.1 Belt sander

The sanding belt must be in good condition, at proper

tension, and tracking correctly, before doing any

sanding, grinding or other abrasive machining

operations. Refer to the section on Track Mechanism

Maintenance if you have any problems with belt

tension or tracking.

6.4 Adjusting the belt sander arm

The arm which holds the sanding belt can be

positioned at a full vertical position, a full horizontal

position, or at any angle in between which is

convenient to the type of sanding you are doing.

A positive stop mechanism is used to permit quick

adjustment to the vertical or horizontal positions.

6.2 Adjusting the belt sander table

You can tilt the table in a range between 20° upward

and 45° downward. A single locking handle on the

side of the table is used to lock and unlock the table

to permit adjustment.

Never adjust the arm angle

while the sander is running. Always turn off the

motor before adjusting the arm angle.

There are two positive lock stop positions: at 90° (that

is, at a right angle to the platen) and at 45° downward

(essentially 90° + 45° or 135° total to the platen.)

To adjust to vertical:

1. Unlock both lock bolts. These are located under

the arbor cover.

2. Move the arm to vertical until it contacts its stop.

3. Tighten both lock bolts, and replace arbor cover.

Never adjust the table angle

while the sander is running. Always turn the

motor off before adjusting the table angle.

To Tilt the Belt Sander Table:

1. Unlock the locking handle on the side of the

table.

2. Using the pointer and scale, set the angle to any

required angle between 20° upward and 45°

downward.

3. Lock the lock handle.

To Tilt the Table to Exactly 45^o:

1. Flip out the stop bracket (see Figure 20).

2. Unlock the locking handle.

Figure 2: Lock bolts for belt arm

3. Move the table until it contacts the stop bracket.

4. Lock the table lock handle.

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To adjust to horizontal:

6.6 Use of the Miter Gauge

1. Unlock both lock bolts.

The miter gauge can be used on either the disc or belt

surfaces to sand accurate angles on workpieces.

When using the gauge alone, you sand a single

angle. However, by tilting the table and using the

miter gauge in combination with the table tilt, it is

possible to sand compound angles, as well.

2. Move arm to horizontal until it contacts its stop.

(See Figure 3.)

3. Tighten both lock bolts and replace arbor cover.

When grinding a compound angle you should always

check the accuracy of your setup by sanding a piece

of scrap material before doing any finish sanding on

the actual workpiece.

1. Set the angle you wish to sand using the scale on

the miter gauge.

2. Tighten the miter gauge securely so the miter

reference surface will not move while you are

sanding.

3. Place the workpiece against the miter reference

surface and slide it along the reference surface

and into the sanding disc or belt. The basic

method is shown in Figure 5, below.

Figure 3: Arm at horizontal – note that the table is

removed. The table may be removed or left in

position, and may also be set to any angle to allow

horizontal sanding of various angles.

To adjust arm to any angle between vertical

and horizontal:

1. Unlock both lock bolts.

2. Use a machinist's protractor and level to set the

arm to the required angle.

3. Tighten both lock bolts and replace arbor cover.

6.5 Adjusting disc sander table

Never adjust the table angle

while the sander is running. Always turn off the

motor before adjusting table angle.

1. Unlock the two locking knobs underneath the

table at each end. (See Figure 4.)

Figure 5: Use of the miter system

2. Using the pointer and scale, set the angle to any

required angle between 20° upward and 45°

downward.

3. Lock the two locking knobs underneath the table.

Figure 4: Disc sander table adjustment

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5. Remove the belt.

7.0 Maintenance

6. Check the drums and platen for scoring or signs

of wear which might require service or

replacement.

7.1 Belt replacement

1. Disconnect the power to the machine to prevent

accidental start-ups. If the machine is plugged

into an outlet, unplug it. If the machine is

hardwired to a branch circuit with a junction box,

remove the fuse or trip the circuit breaker to the

branch.

7. Check the height of the platen with a straight

edge. If it is not 1/32 inch above the drums,

adjust it according to the instructions in Platen

Replacement or Adjustment in the Machine

Setup section of this manual.

8. Check the drums for looseness which might

cause tracking problems. Correct any loose

condition by tightening or replacing any parts as

required.

2. Remove the lock knob and top cover (See Figure

6).

9. Slip the new belt onto the drums and platen.

10. Adjust the tension handle clockwise until the belt

is flat against the platen and there is no curling or

buckling of the belt in the middle.

11. Turn the drums by hand to see if the belt tracks

more-or-less true. JUST BECAUSE THE OLD

BELT TRACKED CORRECTLY DOES NOT

MEAN THE NEW BELT WILL. Always check the

tracking when replacing a belt.

12. To adjust the tracking:

12.1. Plug the machine back into the outlet or

reestablish power in the branch.

12.2. Loosen the tracking lock knob.

Figure 6: Top cover components

12.3. Jog the motor on and off as necessary to

observe the tracking, and turn the tracking knob

as necessary to make the belt track in the center

of the platen and drums. Turn the tracking knob

clockwise to move the belt toward the right and

counterclockwise to move the belt toward the left.

3. Remove the side guard and table.

4. Release the belt tension by turning the tension

handle in a counterclockwise direction (See

Figure 7). If the handle is difficult to turn, perform

Track mechanism maintenance according to the

instructions in section 7.2.

12.4. When the belt seems to be tracking

correctly, turn the motor on and leave it running

while fine tuning the tracking.

12.5. Lock the tracking lock knob.

12.6. When the lock knob is secure, turn the

power off and disconnect the machine from the

outlet or branch as in Step 1, above.

13. Replace the table, side guard, top cover and lock

knob by reversing steps 3 and 2, above.

14. If you have not already done so, reconnect the

power to the machine and return it to service.

7.2 Track mechanism maintenance

While the use of a dust collection system can extend

service intervals, an accumulation of dust will almost

certainly require periodic cleaning of the tracking

mechanism. The more continuous the use of the

machine, the more frequently this maintenance

should be performed.

As mentioned in the preceding section, the need for

required maintenance is often indicated by difficulty in

adjusting the tension/tracking mechanism.

1. With the belt removed according to the

instructions in section 7.1 Belt replacement, pull

out the upper tracking system and clean away all

Figure 7: Belt adjustment components (Note top cover

removed for removal and replacement of belt.)

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built up material in the upper part of the bracket

casting.

2. Take the two keys off of the idler pin bracket,

wipe off, and re-grease.

3. Reverse the above steps to make the machine

ready for reinstallation of the belt according to the

Belt replacement instructions.

7.3 Installing abrasive discs

1. Disconnect power to the machine to prevent

accidental start-ups.

2. Peel off the old abrasive disc.

3. Clean the drive disc surface using naptha or a

similar nonflammable solvent that will dry film-

free.

4. Pull the protective backing half off the new

abrasive disc.

5. Position the new disc carefully so it is centered

accurately on the drive disc. (See Figure 8.)

6. When accurately centered, remove the rest of the

protective backing and press the abrasive disc

firmly against the drive disc so complete

adhesive contact is made.

Figure 9: Removing belt guard

7. Reconnect the power to the machine.

Figure 10: Disc table lock knob

Figure 8: Installing new abrasive disc

5. Remove the belt from the motor pulley.

6. Remove three of the base mounting bolts, then

loosen the fourth bolt slightly. This allows you to

rotate the machine on the machine base (See

Figure 11).

7.4 Replacing the v-belt

1. Disconnect power to the machine to prevent

accidental start-ups.

7. Remove the two bolts, underneath the machine

casting, that secure the disc guard to the casting

(See Figure 11).

2. Remove the belt guard (Figure 9) and disc table.

3. Remove the table tilt lock knob (Figure 10).

4. Loosen the four motor bolts so the motor can

slide on its plate.

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Figure 13: Removing the guard and drive disc,

together.

12. Slide the disc and guard back into position.

13. Reinstall the disc guard bolts underneath the

table.

Figure 11: Rotating the machine casting to remove

the disc guard bolts

14. Position the drive disc so that it is no more than

1/16 inch away from the table, then tighten BOTH

of the set screws by inserting the hex wrench

through the hole in the disc guard casting.

15. Rotate the machine back onto its base and

secure it with all four mounting bolts.

16. Install the belt over the bottom pulley.

17. Tension the belt so that when pressed, in the

middle of its travel, it has no more than one belt's

width of movement – then tighten the four motor

bolts.

18. Observe the alignment of the motor pulley and

arbor pulley. If necessary, correct their alignment

by shifting the motor slightly on its mount (which

involves loosening and retightening the mounting

bolts and checking tension) or by shifting the

pulley slightly on the motor shaft (which involves

loosening the motor pulley set screw and sliding

the pulley into alignment) or by moving the arbor

pulley slightly on its shaft (See Figure 14).

19. When the pulleys are accurately aligned, reinstall

the belt guard.

Figure 12: Locating the set screws that secure the

disc to the arbor

20. Reestablish electrical power to the machine.

8. Through the hole in the disc guard casting, locate

and remove the TWO set screws that secure the

drive disc to the arbor (Figure 12). One set screw

clamps on the arbor key and the other clamps on

the arbor shaft, itself. Be sure you loosen both of

them.

9. Slide the disc and its guard off of the machine,

together (See Figure 13).

10. The V-belt can now be removed from the drive

arbor.

11. Install the new belt on the top pulley.

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8.2 Disc table angle adjustment

1. Disconnect power to the machine to prevent

accidental start-ups.

2. Loosen the table locking knobs on either end of

the table.

3. Using a machinist's square against the table and

disc, set the table at exactly 90° to the disc (See

Figure 15).

4. Tighten the table locking knobs.

5. Check the pointer. If it is not exactly on the zero

mark, loosen the pointer attaching screw, adjust

the pointer, and retighten the screw.

6. Reconnect the power to the machine.

Figure 14: Loosening pulley set screws to allow the

adjustment of pulley on arbor shaft.

8.0 Machine setup

8.1 Basic setup

1. Position the machine where it will be located on

the shop floor. When positioning the machine,

consider the type of work which will be done on it

so you allow sufficient room not only for the

workpieces, but also for service to the machine.

Figure 15: Using a square to check the disc table

scale.

2. Open the door in the base of the machine and,

using the holes in the base as a template, mark

the floor for the position of the hold-down bolts.

8.3 Disc table miter parallelism

adjustment

1. Disconnect power to the machine to prevent

accidental start-ups.

3. Move the machine to expose the hold-down bolt

marks and install anchors for the hold-down

bolts.

2. Set the table angle to zero.

4. Put the machine back over the hold-down

anchors and bolt the machine securely to the

shop floor. THIS MUST BE DONE FOR SAFE

OPERATION OF THE MACHINE.

3. Place a scale or adjustable machinist's square

against either the left or right edge of the disc

face and measure the distance to the miter slot

edge (See Figure 16).

5. Establish an electrical service connection to the

machine. This will vary according to the model

purchased. ALL ELECTRICAL CONNECTIONS

SHOULD BE MADE BY

QUALIFIED

ELECTRICIAN WHO IS FAMILIAR WITH YOUR

STATE AND LOCAL CODES. Many models of

these machines make use of high voltages which

pose a significant risk of serious injury or DEATH

if proper knowledge and precautions are not

used. Electrical instructions are included in

section 9.0 Electrical connections.

6. Machines with belts are shipped with the belts in

slack condition. During the electrical hookup

phase of machine setup, the belt will have to be

tightened and checked for tracking. See the Belt

Replacement section for instructions on this

procedure.

Figure 16: Using an adjustable square to set the table

parallelism.

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4. Move the measuring device to the opposite edge

of the disc and measure the distance to the miter

slot.

8.5 Belt table miter slot parallelism

adjustment

1. Disconnect power to the machine to prevent

accidental start-ups.

5. Adjust the table by loosening the four attachment

screws under the table, then move the table until

the distance between the miter slot and the disc

is equal on both sides (See Figure 17).

2. Set the table angle to zero.

3. Place a scale or adjustable machinist's square

against either the left or right edge of the belt or

platen and measure the distance to the miter slot

edge (See Figure 19).

6. Tighten the four attachment screws.

7. Reconnect the electrical power to the machine.

4. Move the measuring device to the opposite edge

of the belt or platen and measure the distance to

the miter slot.

5. Adjust the table by loosening the three

attachment screws under the table, then move

the table until the distance between the miter slot

and belt or platen is equal on both sides.

6. Tighten the three attachment screws.

7. Reconnect the electrical power to the machine.

Figure 17: Table attachment screws – loosen to

adjust miter groove parallelism.

8.4 Disc table gap adjustment

1. Using a scale, check the gap between the edge

of the table and the face of the disc. It should be

very close to 3/32 inch. If it is much more or less

than that distance, adjust it as follows:

Figure 19: Using an adjustable square to check and

set miter slot parallelism on the belt table.

8.6 Belt table angle adjustment

2. Disconnect the electrical power to the machine.

1. Loosen the table locking handle and tilt the table

upward to about 15°.

3. Using the access hole on the top of the disc

guard, locate and loosen the two set screws that

secure the disc to the shaft.

2. Flip out the stop bracket (See Figure 21).

3. Lower the table until its adjusting screw touches

the stop bracket.

4. Slide the disc in or out along its shaft until the

table-to-disc gap is 3/32 inch (See Figure 18).

4. Place a machinist's square against the table and

belt or platen.

5. Tighten both set screws.

6. Reconnect the electrical power to the machine.

5. If adjustment is required, turn the adjusting screw

(Figure 20) until the table is exactly square to the

platen.

6. Check the pointer. If it is not on 0°, loosen the

pointer screw and adjust the pointer until it is on

0°.

7. Tighten the pointer screw.

8. Loosen the table lock handle and tilt the table

until its stop contacts the 45° stop position.

9. Using a machinist's protractor set on 135° (90° +

45°) adjust the screw until the table and platen

are in correct adjustment. DO NOT reset the

pointer after this operation.

Figure 18: Table-to-disc gap measurement.

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Figure 20: Location of adjustment (socket head)

screws and pointer attachment screw for table angle

adjustment.

Figure 21: Locations of stop lugs and stop bracket for

zero and 45° table positions.

Figure 22: Method for adjusting height of platen

above drive and idler drums.

8.7 Adjusting or replacing the platen

1. Disconnect the electrical power to the machine to

prevent accidental start-ups.

2. Remove the top cover, side guard and belt as

9.0 Electrical connections

outlined in section 7.1, Belt replacement.

Caution: JET sanders are available in a wide variety

of electrical configurations to meet the needs of the

purchaser with respect to power available and

compliance with electrical codes. Each machine is

tested at the factory for operation before shipment

and the power cord is tagged with the power

requirements for the machine, as shipped.

HOWEVER, before attempting any electrical hookup,

you should be certain:

3. Remove the table by unscrewing the locking

handling and lifting the complete table assembly,

from the machine.

4. If you are replacing the platen, remove the three

screws that hold it to its mount -- then install the

new platen and replace the mounting screws

finger tight.

5. If you are only adjusting the platen, loosen the

three mounting screws to allow adjustment.

1. The electrical characteristics of the service

branch match the requirements of the motor.

6. Using a straight edge as shown in Figure 22,

adjust the platen height until it is 1/32 inch higher

than the crown of both the drive and idler drums.

2. The service branch is equipped with wires of the

required gauge or size.

3. The branch circuit intended for the machine is

protected with a time delay fuse or circuit breaker

with rated amperage just slightly greater than the

full load current of the motor.

7. Tighten the platen adjustment screws.

8. Reinstall the table and belt.

9. Check and adjust, if necessary, the tracking of

the belt according to instructions in section 7.1,

Belt replacement.

MOTOR AMPERAGE full load current

10. Reinstall the guards and covers.

Phase Voltage Amperage

11. Check and adjust the table angles and miter slot

squareness according to table adjustment

instructions in this manual.

115

220

440

5.2

2.6

12. Reconnect the electrical power to the machine.

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machine connection is made and the time delay fuse

or circuit breaker should be a value just slightly higher

than the maximum load current draw.

All electrical service work on

your JET sander should be performed by a

qualified, licensed electrician who is familiar with

all safe standard electrical installation practices

and all applicable electrical codes. This includes

local electrical codes which may affect the

connection and operation of the sander in your

specific manufacturing operation.

9.2 Three phase electrical hookup

1. Be certain the power to the branch you are

connecting is off and locked out, so power cannot

be reestablished accidentally.

2. Connect the ground wires. These wires will be

either green, or green with a white stripe.

9.1 Single phase electrical hookup

When connecting your machine to single phase

power, you may be connecting to either 115 or 230

volts, depending upon the motor type provided. Local

codes may, or may not, permit the use of a plug type

of connection for your machine. Where a plug

connection is permitted, the following installation

practices must be followed:

3. Connect the remaining three cable wires to the

three power wires in the service branch.

4. Reestablish the power to the branch.

Motor rotation

The motor should be turning counterclockwise, the

belt sander should be moving downward and the disc

sander should be turning clockwise. If this is the case,

the machine can be considered wired correctly. If the

motor is not turning in the correct direction, take the

following corrective action:

1. The plug used must be a grounding type of plug.

That is, on a 115 volt single phase connection,

the plug must be a three-prong plug with two flat,

parallel blades for the power wires and a single

rounded or U-shaped prong for the ground

connection. On 230 volt single phase

connections, the lug must be a three prong plug

with two flat blades in tandem to carry the

current, and a third round or U-shaped prong for

the ground connection.

1. Disconnect power in the branch again and be

certain it cannot be accidentally turned on while

you correct the wiring.

2. Reverse ANY TWO of the power wires to the

machine.

2. The service branch to which the plug is

connected must be a branch with a separate

ground wire so the grounding prong of the plug

can be connected to ground effectively.

3. Reestablish the power to the machine.

4. Turn the machine on. The motor should now be

turning in the correct direction.

Note: Local electrical codes in many jurisdictions

DO NOT ALLOW THE USE OF PLUG TYPE

CONNECTIONS FOR SINGLE PHASE POWER

WHEN THE MACHINE IS USED IN A COMMERCIAL

OR INDUSTRIAL ESTABLISHMENT.

Voltage conversion

Three phase machines are pre-wired for 230V or

460V per customer request. If it becomes necessary

to change the voltage:

In these cases you must connect your machine to the

service branch using a hardwired junction box

connection.

1. Remove back cover from the base and place

machine on its side.

Motor rotation

2. Remove terminal cover from motor. Rewire the

motor according to the motor connection

diagram in section 12.2.

The motor's rotation should result in the belt sander

moving downward and the disc sander rotating

counterclockwise.

3. Replace the current magnetic switch with the

460V switch (p/n 4202A-5095, purchased

separately – see your dealer or contact Walter

Meier to order).

Voltage conversion

Single phase machines are pre-wired for 115V or

230V per customer request. If it becomes necessary

to change the voltage, remove the back cover from

the base and place the machine on its side. Remove

the terminal cover from the motor. Rewire the motor

according to the motor connection diagram in section

12.1. Different electrical plugs are required depending

on which voltage you select. This completes the

voltage conversion process.

4. This completes the voltage conversion

process.

Circuit protection

Where the service branch is protected with a fuse or

circuit breaker that has too high a value to offer

protection to the motor supplied, a fuse or circuit

breaker box should be used at the point where the

machine connection is made and the time delay fuse

or circuit breaker should be a value just slightly higher

than the maximum load current draw.

Circuit protection

Where the service branch is protected with a fuse or

circuit breaker that has too high a value to offer

protection to the motor supplied, a fuse or circuit

breaker box should be used at the point where the

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10.0 Troubleshooting

Symptom

Possible Cause

Correction

Motor will not run

Voltage is too low.

Check power supply for proper voltage.

Branch circuit fuse is blown or circuit

breaker is tripped.

Determine the reason for the blown fuse or

tripped circuit breaker; then replace the fuse

or reset the breaker.

Branch is shut down for service.

Check all personnel and machines on

the branch to be certain someone has

not shut down the branch for service. DO

NOT replace the fuse or reset the breaker

unless you are certain no personnel are

working on the machines, wires or controls in

the circuit.

Open circuit in the wiring.

Inspect all wire connections for loose or

open connections.

Motor is defective.

Switch is defective.

Low voltage.

Replace the motor.

Replace the switch.

Motor stalls easily

Check for proper voltage at the motor;

correct as necessary.

Fuse blown (three phase motors only).

Improper wiring.

Replace the blown fuse.

Check for proper connections.

Replace the belt.

Abrasive belt or disc

slows down although

motor keeps running at

working speed

Belt is slipping.

Poor tracking

Tracking is out of adjustment.

Too much belt tension.

Adjust the belt tracking.

Loosen the tension until the belt is just taut.

Tighten the tension until the belt is more taut.

Check belt for an irregular seam or shape.

Not enough belt tension.

Belt is jointed improperly.

Lack of crown on the drive roller.

Remove the belt and put a straight edge

along the drive roller. There should be a

slight crown (high spot toward the middle of

the roller.) If the crown has worn away,

replace the roller.

Worn bearings.

Check all the bearings for excessive heat or

loose shafts. Replace if necessary.

Unsteady belt

Short belt life

Slack in the abrasive belt

Adjust the belt tension.

Excessive pressure applied while Allow the belt to do the cutting. Excessive

grinding.

pressure only dulls the grit and removes it

from the cloth.

Working on only one side of the belt or Use all surface areas of the abrasive cloth.

only in one area of the disc.

Incorrect abrasive material or grit size.

Check with your abrasives supplier for

recommendations on the type and

coarseness of the abrasive required for the

workpieces you are sanding or grinding.

CAUTION: For all of the electrical faults and corrections in the above table JET recommends the use of a qualified

and licensed electrician for all circuit tracing, diagnosis and repair.

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11.0 Replacement parts

Replacement parts are listed on the following pages. To order parts or reach our service department, call 1-800-274-

6848 Monday through Friday (see our website for business hours, www.waltermeier.com). Having the Model Number

and Serial Number of your machine available when you call will allow us to serve you quickly and accurately.

11.1.1 Model J-4200A Belt and Disc Sander Assembly – Exploded View

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11.1.2 Model J-4200A Belt and Disc Sander Assembly – Parts List

Index No Part No Description Size

Qty

1 ................J-5508427 ................. Bracket..................................................................... ......................................1

2 ................5511833 .................... Square Nut............................................................... M10...............................1

3 ................5051081 .................... Spring ...................................................................... ......................................1

4 ................5051091 .................... Sleeve...................................................................... ......................................1

5 ................5051131 .................... Collar ....................................................................... ......................................1

6 ................5508431 .................... Shaft with Collar....................................................... ......................................1

7 ................J-5051151 ................. Cap.......................................................................... ......................................1

8 ................TS-2361051 .............. Lock Washer............................................................ M5.................................2

9 ................TS-1513051 .............. Socket Head Flat Screw.......................................... M5x25 ...........................2

10 ..............5051721 .................... Hand Wheel............................................................. ......................................1

12 ..............TS-1550071 .............. Flat Washer ............................................................. M10...............................2

13 ..............J-5508432 ................. Tilting Table ............................................................. ......................................1

14 ..............5508450 .................... Hand Knob............................................................... ......................................4

15 ..............5508429 .................... Belt Adjustment Knob .............................................. M10...............................1

16 ..............5511824 .................... Drive Screw ............................................................. Ø2x5 .............................5

17 ..............5508437 .................... Stop Lock................................................................. ......................................1

18 ..............5511828 .................... Groove Pin............................................................... Ø5x45 ...........................1

19 ..............5051351 .................... Tilting Scale ............................................................. ......................................1

20 ..............TS-1523011 .............. Socket Set Screw .................................................... M6x6 .............................2

21 ..............5511827 .................... Groove Pin............................................................... Ø4x8 .............................2

22 ..............5051331 .................... Segment .................................................................. ......................................1

23 ..............5511725 .................... 4200 Arbor Pulley.................................................... ......................................1

24 ..............TS-1504061 .............. Socket Head Cap Screw.......................................... M8x30 ...........................4

25 ..............TS-2361081 .............. Lock Washer............................................................ M8.................................4

26 ..............J-5508433 ................. Trunnion................................................................... ......................................1

27 ..............TS-1550061 .............. Flat Washer ............................................................. M8.................................9

28 ..............TS-2361081 .............. Lock Washer............................................................ M8.................................9

29 ..............TS-1490041 .............. Hex Cap Screw........................................................ M8x25 ...........................3

30 ..............5508435 .................... Stud ......................................................................... M10...............................1

31 ..............TS-1550071 .............. Flat Washer ............................................................. M10...............................4

32 ..............5508436 .................... Acorn Nut and Handle ............................................. ......................................1

33 ..............TS-2361061 .............. Lock Washer............................................................ M6.................................3

34 ..............TS-1482031 .............. Hex Cap Screw........................................................ M6x16 ...........................3

35 ..............5508439 .................... Preload Bushing ...................................................... M54...............................1

36 ..............BB-6205ZZ................ Ball Bearing ............................................................. 6205ZZ..........................1

37 ..............J-5508438 ................. Bearing Housing ...................................................... ......................................1

38 ..............TS-2210951 .............. Hex Cap Screw........................................................ M10x140 .......................2

39 ..............5051421 .................... Key........................................................................... 5x5x70 mm ...................1

40 ..............5508441 .................... Drive Shaft............................................................... ......................................1

41 ..............5051451 .................... Key........................................................................... 5x5x35 mm ...................1

42 ..............4200A-042................. Key........................................................................... 5x5x55 mm ...................1

43 ..............BB-6204ZZ................ Ball Bearing ............................................................. 6204ZZ..........................1

44 ..............5051471 .................... Retaining Ring ......................................................... S20................................1

45 ..............VB-A59...................... V-Belt....................................................................... 17610............................1

46 ..............TS-2245081 .............. Socket Head Flat Screw.......................................... M5x8 .............................4

47 ..............J-5508444 ................. Belt Guard Assembly............................................... ......................................1

49 ..............TS-1540071 .............. Hex Nut, Full............................................................ M10...............................5

50 ..............5508446 .................... Stop Pin................................................................... ......................................1

51 ..............J-5508447 ................. Base......................................................................... ......................................1

52 ..............TS-2210801 .............. Hex Cap Screw........................................................ M10x80 .........................4

53 ..............TS-1550071 .............. Flat Washer ............................................................. M10...............................8

54 ..............TS-2361101 .............. Lock Washer............................................................ M10...............................6

55 ..............5051841 .................... Garnet Belt............................................................... ......................................1

56 ..............J-5508455 ................. Deflector Plate......................................................... ......................................1

57 ..............TS-2361051 .............. Lock Washer............................................................ M5.................................2

58 ..............TS-1513021 .............. Socket Head Flat Screw.......................................... M5x12 ...........................2

59 ..............J-5508454 ................. Drive Drum Guard.................................................... ......................................1

60 ..............5508456 .................... Dust Deflector.......................................................... ......................................1

61 ..............TS-2361101 .............. Lock Washer............................................................ M10...............................3

62 ..............TS-1491021 .............. Hex Cap Screw........................................................ M10x20 .........................3

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Index No Part No

Description

Size

Qty

63 ..............J-5508457 ................. Platen....................................................................... ......................................1

64 ..............TS-1514011 .............. Socket Head Flat Screw.......................................... M6x12 ...........................2

65 ..............J-5051601A............... Side Guard............................................................... ......................................1

66 ..............TS-1540231 .............. Hex Nut.................................................................... M24x18.........................1

67 ..............9058121 .................... Lock Washer, Ext..................................................... M24...............................1

68 ..............5051981 .................... Spacer ..................................................................... ......................................1

69 ..............5051971A.................. Drive Drum............................................................... ......................................1

70 ..............5508458 .................... Clamp Ring.............................................................. ......................................1

71 ..............5544728 .................... Drum Spacer............................................................ ......................................2

72 ..............5051031 .................... Tension Lever Pin.................................................... ......................................1

73 ..............5051021 .................... Belt Tension Lever................................................... ......................................1

74 ..............BB-6202ZZ................ Ball Bearing ............................................................. 6202ZZ..........................2

75 ..............5508461 .................... Idler Drum Shaft with Lock Nut................................ ......................................1

76 ..............TS-2342121 .............. Nylon Lock Hex Nut................................................. M12...............................2

77 ..............5508460 .................... Bearing Lock Nut ..................................................... ......................................1

78 ..............J-5051591A............... Idler Drum Guard..................................................... ......................................1

79 ..............5508462 .................... Stud ......................................................................... ......................................3

80 ..............5508463 .................... Clamp Bar................................................................ ......................................2

81 ..............J-5052121 ................. Bottom Guard .......................................................... ......................................1

82 ..............TS-2361061 .............. Lock Washer............................................................ M6.................................4

83 ..............5052061B.................. Idler Drum Spacer.................................................... ......................................2

84 ..............J-5508459 ................. Idler Pin Bracket ...................................................... ......................................1

85 ..............TS-0367061 .............. Roll Pin .................................................................... 1/4”x1-1/4”.....................2

86 ..............5052001 .................... Block........................................................................ ......................................2

87 ..............5052061A.................. Idler Drum................................................................ ......................................2

88 ..............5508434 .................... Pointer ..................................................................... ......................................1

89 ..............5508451 .................... Clamp with Pins....................................................... ......................................2

90 ..............4200A-090................. Roll Pin .................................................................... Ø6x45 ...........................4

91 ..............J-5508453 ................. Disc Guard............................................................... ......................................1

92 ..............TS-2239551 .............. Socket Head Cap Screw.......................................... M10x55 .........................2

93 ..............5051741 .................... Pointer ..................................................................... ......................................1

94 ..............TS-1523031 .............. SHSS....................................................................... M6x10...........................2

95 ..............5051641 .................... Disc, Aluminum........................................................ ......................................1

96 ..............5051631 .................... Garnet Disc.............................................................. ......................................1

97 ..............5051681 .................... Trunnion................................................................... ......................................2

98 ..............TS-1490041 .............. Hex Cap Screw........................................................ M8x25 ...........................4

99 ..............J-5508449 ................. Table........................................................................ ......................................1

100 ............5051701 .................... Tilting Table Scale ................................................... ......................................1

101 ............5052271 .................... Deluxe Miter Gauge................................................. ......................................1

102 ............TS-1550071 .............. Flat Washer ............................................................. M10...............................2

103 ............TS-1482032 .............. Hex Cap Screw........................................................ M6x16 ...........................4

104 ............4200A-104J............... JET Logo Plate........................................................ ......................................1

105 ............4200A-105................. Label, Direction........................................................ ......................................2

106 ............TS-1482081 .............. Hex Cap Screw........................................................ M6x40 ...........................2

107 ............TS-1540041 .............. Hex Nut, Full............................................................ M6.................................2

108 ............TS-1523021 .............. Socket Head Flat Screw.......................................... M6x8 .............................1

111 ............5511818 .................... Flat Head Screw...................................................... M5x6 .............................4

113 ............4200A-113................. Sponge .................................................................... 300x7.5mm, t=2mm......2

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11.2.1 Model J-4300A Belt Sander Assembly – Exploded View

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11.2.2 Model J-4300A Belt Sander Assembly – Parts List

Index No Part No Description