ELECTRIC LONG SHAFT DIE
GRINDER
44141
ASSEMBLY and OPERATING
INSTRUCTIONS
1/4” Collet Accepts Most Popular Die Grinding Accessories
Diagrams within this manual may not be drawn proportionally.
Due to continuing improvements, actual product may differ slightly from the product described herein.
Distributed exclusively by Harbor Freight Tools®.
3491 Mission Oaks Blvd., Camarillo, CA 93011
Read this material before using this product.
Failure to do so can result in serious injury.
SaVe THiS manual.
Copyright© 2000 by Harbor Freight Tools®. All rights reserved. No portion of this manual
or any artwork contained herein may be reproduced in any shape or form without the
express written consent of Harbor Freight Tools.
For technical questions or replacement parts, please call 1-800-444-3353.
REV 06b
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Wear a full face shield if you are producing metal filings or wood chips. Wear an ANSI
approved dust mask or respirator when working around metal, wood, and chemical
dusts and mists.
9. Do not overreach. Keep proper footing and balance at all times. Do not reach over or
across running machines.
10. Maintain tools with care. Keep tools sharp and clean for better and safer
performance. Follow instructions for lubricating and changing accessories. Inspect tool
cords periodically and, if damaged, have them repaired by an authorized technician.
The handles must be kept clean, dry, and free from oil and grease at all times.
11. Disconnect power. Unplug power cord when not in use.
12. Remove adjusting keys and wrenches. Check that keys and adjusting wrenches
are removed from the tool or machine work surface before plugging it in.
13. Avoid unintentional starting. Be sure the switch is in the Off position when not
in use and before plugging in. Do not carry any tool with your finger on the trigger,
whether it is plugged in or not.
14. Stay alert. Watch what you are doing, use common sense. Do not operate any tool
when you are tired.
15. Check for damaged parts. Before using any tool, any part that appears damaged
should be carefully checked to determine that it will operate properly and perform its
intended function. Check for alignment and binding of moving parts; any broken parts
or mounting fixtures; and any other condition that may affect proper operation. Any
part that is damaged should be properly repaired or replaced by a qualified technician.
Do not use the tool if any switch does not turn On and Off properly.
16. Guard against electric shock. Prevent body contact with grounded surfaces such as
pipes, radiators, ranges, and refrigerator enclosures.
17. Replacement parts and accessories. When servicing, use only identical
replacement parts. Use of any other parts will void the warranty. Only use accessories
intended for use with this tool. Approved accessories are available from Harbor Freight
Tools.
18. Do not operate tool if under the influence of alcohol or drugs. Read warning
labels on prescriptions to determine if your judgment or reflexes are impaired while
taking drugs. If there is any doubt, do not operate the tool.
19. Use proper size and type extension cord. If an extension cord is required, it must be
of the proper size and type to supply the correct current to the tool without heating up.
Otherwise, the extension cord could melt and catch fire, or cause electrical damage
to the tool. This tool requires use of an extension cord of 0 to 10 amps capability (up
to 50 feet), with wire size rated at 18 AWG. Longer extension cords require larger size
wire. If you are using the tool outdoors, use an extension cord rated for outdoor use.
(signified by “WA” on the jacket).
20. Maintenance. For your safety, maintenance should be performed regularly by a
qualified technician.
SKU 44141
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Note:Performanceofthistool(ifpoweredbylinevoltage)mayvarydependingonvariations
in local line voltage. Extension cord usage may also affect tool performance.
Warning:The warnings, cautions, and instructions discussed in this instruction manual
cannot cover all possible conditions and situations that may occur.It must be understood
by the operator that common sense and caution are factors which cannot be built into
this product, but must be supplied by the operator.
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other
construction activities, contains chemicals known [to the State of California] to cause
cancer, birth defects or other reproductive harm. Some examples of these chemicals are:
• Lead from lead-based paints
• Crystalline silica from bricks and cement or other masonry products
• Arsenic and chromium from chemically treated lumber
Your risk from these exposures varies, depending on how often you do this type of work.
To reduce your exposure to these chemicals: work in a well ventilated area, and work with
approved safety equipment, such as those dust masks that are specially designed to filter
out microscopic particles. (California Health & Safety Code § 25249.5, et seq.)
Warning:
There are certain applications for which this tool was designed. Harbor Freight Tools
strongly recommends that this tool not be modified and/or used for any application other
than which it was designed.
All accessories must be rated for at least 25,000 RPM. Wheels and other
accessories running over rated speed can fly apart and cause injury.
For safest operation, it is recommended that only these accessories be used with this
product:
Abrasive Cut-Off Discs and Wheels
Wire Brushes
1/4” Shaft Grinding Wheels
Flap Wheels
Wire Wheel Brushes
Rotary Burrs
Always use an approved and proper guard when using the above mentioned
accessories. Each accessory must have the correct arbor size and must fit properly
on the shoulder bushing. Make sure accessories are tightened down securely.
CAUTION: NEVER INSTALL A CARBIDE TIPPED OR STEEL CIRCULAR
SAW BLADE fOR USE ON ThIS DIE GRINDER. NEVER INSTALL A
WOOD CARVING BLADE, CARVING DISC WITh SAW ChAIN CUTTERS,
OR A CUTTING CARVING DISC ON ThIS DIE GRINDER.
Unpacking
When unpacking, check to make sure the parts listed on page 8 are included. If any parts
are missing or broken, please call Harbor Freight Tools at the number on the cover of this
manual as soon as possible.
SKU 44141
Page 4
Rev 01c, 08a
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Operation
Caution: Unplug the Grinder and turn the Switch Lever (#20) to the off position.
Use Type 1 grinding wheels with a 1-1-2” maximum diameter and
1/4” maximum thickness.
1. This grinder is equipped with a
Collet Chuck (#1). The Collet Chuck (#1)
is sized to accept a 1/4” mandrel.
Figure 1
To use any other sized mandrel (ie: 1/8”)
you must change the
Collet Chuck(#1). See Figure 1
Collet Shaft
Collet Chuck
2. Rotary Files and Grinding Wheels.
The maximum diameter for rotary files with a 1/4”
Figure 2
mandrel is 3/8”. The maximum diameter for
grinding wheels with a 1/4” mandrel is 1-1/2”.
See Figure 2
Warning: Never use files or wheels rated below
25,000 rpm’s. They can disintegrate during
operation causing serious injury.
1/4” Mandrel
Grinding Wheel
Max. Dia. 1-1/2”
Rotary File
Max. Dia. 3/8”
Note: Use grinding wheels when cutting or shaping hard materials.
Use rotary files for milling soft metals, such as brass, copper, or aluminum.
3. Using the two wrenches provided with the grinder kit, attach a grinding wheel or rotary
file. Hold the lower section (closest to collet shaft) of the Collet Chuck (#1) with one of the
wrenches, while turning the Collet Chuck (#1) with the other wrench to loosen.
See Figures 1 and 3.
4. Insert the mandrel into the Collet Chuck (#1)
at least 5/8”. Failure to do so could cause the
mandrel to disengage from the Collet Chuck (#1)
causing serious injury.
5. Using the wrenches, securely tighten the
Collet Chuck (#1) . See Figure 3.
Figure 3
Note: Before each use, always check that the mandrel is securely fastened into the
Collet Chuck (#1).
SKU 44141
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6. Make sure your hands and fingers are not touching the grinding wheel or file before starting
the unit. Plug in the unit.
7. For maximum safety and control hold the grinder with both hands away from your body.
Make sure you do not cover the vents on the Rear Cover (#36). Restricting air flow from the
vents could cause the motor to overheat, effecting the overall life of the tool.
Note: Make sure your workpiece is securely clamped down.
8. Holding the unit away from your body, turn the Switch Lever (#20) on. See Figure 4.
Switch Lever (#20)
Figure 4
Workpiece
Gently make contact with your workpiece. Let the tool do the work. Do not force it.
Excessive pressure could bend or break the mandrel causing injury. The grinder is designed
to run smoothly under load. If it is not running smoothly, you are putting too much pressure
on the tool.
SKU 44141
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Maintenance
Caution: Before starting maintenance make sure the tool is off and unplugged.
1. This unit uses expendable Carbon Brushes (#24).They need to be regularly inspected and
changed if necessary. The Carbon Brushes (#24) will wear down to the limit line, needing
replacement. Make sure the Carbon Brushes (#24) are always clean.They must be clean so
that they easily slide into the Carbon Brush holder (#25). Use an old toothbrush to remove
dirt or debris. See Figure 5 and the Assembly Diagram on page 9 of this manual.
3/16”
Figure 5
Carbon Brush (#24)
2. Changing Carbon Brushes (#24).
To remove the Carbon Brushes (#24) use a flat screwdriver to remove the
Carbon Brush Cap (#23). Gently remove the Carbon Brushes (#24) and the spring.
See Figure 5 and the Assembly Diagram on page 9 of this manual. Replace or clean the
brushes and slide back into the Carbon Brush holder (#25).
3. This grinder vibrates from the high rate of rpm’s utilized in operation. Frequently inspect all
screws and tighten if necessary.
4. Keep all liquids away from the grinder’s internal mechanism.
Any further maintenance must be performed by a authorized service technician.
SKU 44141
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Parts List
Part No. Description
Qty.
2
2
2
1
1
6
1
1
1
1
2
2
1
1
1
1
Part No. Description
Qty.
1
4
1
13
1
23
24
25
26
27
28
29
31
32
33
34
35
36
37
38
39
42
43
Brush Holder Cap
Carbon Brush
Carbon Brush Holder
Screw ST3.9x10-C-H
Switch
Screw ST3.9x16-C-H
Switch Base
Cover
Screw St3.9x13-C-H
Cord Guard
Nut M4
Support
Rear Cover
1
Collet
2
3
4
Screw ST3.9x32-C-H
Front Case
Washer 4
5
Spindle
6
7
8
Ball Bearing 6001-2RS 1
Retaining Ring 12
Ball Bearing 6200-2RS 1
1
9
Retaining Ring 30
Coupling
Washer
Retaining Ring 22
Ball Bearing 626-2RS 1
Inner Cover
Armature Assembly
Screw
Ball Bearing 626-2RS 1
Field Assembly
Rubber Gauge Washer 1
Switch Lever
Switch Pull Rod
Motor Housing
1
1
1
1
10
11
12
13
14
15
16
17
18
19
20
21
22
Power Cord
Description Plate
Nameplate
1
1
2
Washer
1
1
Rubber Gauge Washer
ACCESSORIES
Wrench
1
40
1
1
2
1
1
1
41
Wrench
24 A
Spare Carbon Brush
PLEASE READ ThE fOLLOWING CAREfULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDEDTHE PARTS DIAGRAM INTHIS
MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER NOR DISTRIBU-
TOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT
HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT OR THAT HE OR SHE
IS QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER
AND/OR DISTRIBUTOR EXPRESSLY STATESTHAT ALL REPAIRS AND PARTS REPLACEMENTS
SHOULD BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS AND NOT BY THE
BUYER. THE BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER
REPAIRS TO THE ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING
OUT OF HIS OR HER INSTALLATION OF REPLACEMENT PARTS THERETO.
NOTE: Some parts are listed and shown for illustration purposes only and are not available
individually as replacement parts.
SKU 44141
Page 8
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Assembly Diagram
SKU 44141
Page 9
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LIMITED 90 DAY WARRANTY
Harbor FreightTools Co.makes every effort to assure that its products meet high quality
and durability standards, and warrants to the original purchaser that this product is free from
defects in materials and workmanship for the period of 90 days from the date of purchase.This
warranty does not apply to damage due directly or indirectly, to misuse, abuse, negligence or
accidents, repairs or alterations outside our facilities, criminal activity, improper installation,
normal wear and tear, or to lack of maintenance. We shall in no event be liable for death,
injuries to persons or property, or for incidental, contingent, special or consequential damages
arising from the use of our product. Some states do not allow the exclusion or limitation of
incidental or consequential damages, so the above limitation of exclusion may not apply to
you.THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES, EXPRESS
OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with
transportation charges prepaid. Proof of purchase date and an explanation of the complaint
must accompany the merchandise. If our inspection verifies the defect, we will either repair or
replace the product at our election or we may elect to refund the purchase price if we cannot
readily and quickly provide you with a replacement. We will return repaired products at our
expense, but if we determine there is no defect, or that the defect resulted from causes not
within the scope of our warranty, then you must bear the cost of returning the product.
This warranty gives you specific legal rights and you may also have other rights which
vary from state to state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353
REV 08a
SKU 44141
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