MODEL H8253
AIR BELT SANDER
INSTRUCTION MANUAL
COPYRIGHT © DECEMBER, 2007 BY GRIZZLY INDUSTRIAL, INC.
WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
#JB10165 PRINTED IN CHINA
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SAFETY
For Your Own Safety Read Instruction Manual
Before Operating This Equipment
The purpose of safety symbols is to attract your attention to possible hazardous
conditions. This manual uses a series of symbols and signal words which
are intended to convey the level of importance of the safety messages. The
progression of symbols is described below. Remember that safety messages by
themselves do not eliminate danger and are not a substitute for proper accident
prevention measures.
Indicates an imminently hazardous situation which,
if not avoided, WILL result in death or serious injury.
Indicates a potentially hazardous situation which, if
not avoided, COULD result in death or serious injury.
Indicates a potentially hazardous situation which, if
not avoided, MAY result in minor or moderate injury.
It may also be used to alert against unsafe practices.
This symbol is used to alert the user to useful
NOTICE
information about proper operation of the equipment.
Safety Instructions for Pneumatic Tools
1. READ THIS MANUAL. This tool may
cause personal injury if used incor-
rectly. This manual contains proper
safety and operating instructions that
must be followed to reduce this risk.
2. WEAR EYE PROTECTION. This
tool may throw small fragments dur-
ing operation, which may cause seri-
ous eye injury. Always wear ANSI
approved safety glasses or face shield
to reduce your risk from this hazard.
3. WEAR A RESPIRATOR. This tool
may produce fine dust during oper-
ation, which can cause respiratory
injury if inhaled. Always wear a respi-
rator NIOSH approved for the type of
material being processed.
4. WEAR HEARING PROTECTION.
Operating this tool for prolonged time
periods may damage your hearing.
Your risk depends on length and fre-
quency of use. To reduce your risk of
this hazard, wear hearing protection.
5. MAINTAIN SAFETY GUARDS. Your
tool may be equipped with safety
guards or other structural compo-
nents designed to reduce the risk of
injury during operation. Never modify
or operate this tool with any guards or
components removed or damaged.
6. KEEP CHILDREN AWAY. Prevent
children from injury by keeping them
away from this tool. Disconnect and
lock the tool away when not in use.
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16. DO NOT FORCE TOOL. It will do
the job better and safer at the rate
for which it was designed.
7. AVOID ENTANGLEMENTS. Do not
wear loose clothing, gloves, neck-
ties, rings, bracelets, or other jewel-
ry, which may get caught in moving
parts, when operating this tool. Wear
a protective hair covering to contain
long hair.
8. USE CORRECT AIR PRESSURE.
Exceeding the maximum PSI rating
of this tool may cause unpredictable
operation or bursting.
9. DISCONNECT AIR PRESSURE
before servicing, changing accesso-
ries, or moving to another location.
Never leave this tool unattended
when connected to air.
10. SECURE TOOLING. Always verify
tooling is secure before operation.
11. SHARP SURFACES. DO NOT
place hands near the tooling sur-
faces when in operation.
12. REMOVE ADJUSTING KEYS AND
WRENCHES AFTER USE. These
tools become dangerous projectiles
if left on the tool when it is started.
13. AVOID FLAMMABLES. Do not use
this tool around any flammables that
may be ignited by sparks.
14. SECURE WORK. Use clamps or a
vise to hold work when practical. It is
safer than using your hand and frees
both hands to operate tool.
15. MAINTAIN TOOLS WITH CARE.
Keep tools lubricated and clean
for best and safest performance.
Follow instructions for lubricating
and changing accessories.
17. CHECK FOR DAMAGED PARTS
BEFORE USING. Check for bind-
ing and alignment of parts, broken
parts, part mounting, loose bolts,
and any other conditions that may
affect operation. Repair or replace
damaged parts before operating.
18. USE GOOD LIGHTING. Keep work
area well lighted. Dark work areas
increase risk of accidental injury.
19. AVOID
UNINTENTIONAL
OPERATION. Always disconnect air
when not in use, and do not carry
tool with hand on trigger.
20. USE
THE
RECOMMENDED
ACCESSORIES. Consult owner’s
manual for recommended acces-
sories. Using improper accessories
may increase the risk of injury.
21. NEVER ALLOW UNTRAINED
USERS TO USE THIS TOOL WHILE
UNSUPERVISED.
22. IF YOU ARE UNSURE OF THE
INTENDED OPERATION, STOP
USING TOOL. Seek formal training
or research books or magazines that
specialize in pneumatic tools.
23. BE AWARE OF HOSE LOCATION.
Hoses can easily become a tripping
hazard when laid across the floor in
a disorganized fashion.
24. DO NOT USE UNDER THE
INFLUENCE OF DRUGS OR
ALCOHOL, OR WHEN TIRED.
No list of safety guidelines is complete, because every work environment is
different. Always consider safety first and use common sense. Failure to use this
tool with caution and respect could result in serious personal injury.
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INTRODUCTION
Foreword
Specifications
The
specifications,
details,
and
Motor Speed........................... 18,000 RPM
Air Consumption............................ 28 CFM
Air Inlet ......................................1⁄4"-18 NPT
Required PSI.............................. 70-90 PSI
Maximum PSI.................................. 90 PSI
Abrasive Belt Size .................. 1" W x 18" L
Sound Level ......................................84 dB
photographs in this manual represent
the Model H8253 as supplied when the
manual was prepared. However, owing to
Grizzly’s policy of continuous improvement,
changes may be made at any time with no
obligation on the part of Grizzly.
If you have any comments regarding this
manual, please write to us at the following
address:
Inventory
H8253 Inventory (Figure 1)
Qty.
Grizzly Industrial, Inc.
C/O Technical Documentation
P.O. Box 2069
Bellingham, WA 98227-2069
E-Mail: [email protected]
A. Handle................................................ 1
B. Contact Arm Assembly ...................... 1
C. Hex Wrench (3mm)............................ 1
D. Air Motor Assembly............................ 1
E. Sanding Belts 1" x 18"..................... 11
F. Cap Screw M4-.7 x 14 (Belt Guard) .. 1
G. Belt Guard.......................................... 1
Most importantly, we stand behind our
tools. If you have any service questions or
parts requests, please call or write us at
the location listed below.
B
A
D
Grizzly Industrial, Inc.
1203 Lycoming Mall Circle
Muncy, PA 17756
C
Phone: (570) 546-9663
Fax: (800) 438-5901
E-Mail: [email protected]
E
F
G
Figure 1. Model H8253 Inventory.
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Compressed Air
System
Exceeding the maximum permissible
operating pressure may damage the
sander and cause it to malfunction. To
protect yourself from personal injury,
DO NOT allow the air pressure to
exceed the recommended pressure
for this sander!
The Model H8253 is designed to be
operated between 70-90 PSI using clean,
dry, regulated, compressed air. DO NOT
exceed the 90 PSI maximum operating
pressure for your sander.
Avoid overlubricating, as excess oil may
spray out during sanding, potentially
damaging the workpiece and sanding
belt.
Before using your new sander, regulate
the air pressure to find the optimum setting
within the specified operating range. Start
by testing the sander at a low setting, then
increase the air pressure as needed for
satisfactory results.
Check the current Grizzly catalog for
availability of filters and regulators. If you
plan on installing a filter and regulator in
your compressed air system, always follow
the connection instructions that come with
those units.
An in-line filter/lubricator/regulator unit can
be installed, as depicted in Figure 2.
This filter/lubricator/regulator will protect
your tool from damaging water build-up,
allow you to adjust and maintain constant
air pressure to your tool, and save you
the inconvenience of having to manually
lubricate your tool every time you use it.
Quick
Connector
Quick
Connector
Lubricator
Regulator
Your
Tool
Air
Compressor
Quick
Coupler
Quick
Coupler
Leader Hose
Filter
Recoil Hose
Figure 2. Typical filter and regulator installation order.
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ASSEMBLY
Attaching the Handle
The Model H8253 must be assembled
before use. Assembly consists of
connecting the contact arm assembly to
the air motor and attaching the handle.
1. DO NOT YET CONNECT THE
SANDER TO THE AIR SUPPLY!
2. Thread the handle into the handle arm,
as shown in Figure 4.
Connecting the Contact Arm
1. DO NOT YET CONNECT THE
SANDER TO THE AIR SUPPLY!
2. Slide the contact arm assembly onto
the air motor, making sure it is snug
against the shoulder, as shown in
Figure 3.
Handle
Handle Arm
Cap Screw
Figure 4. Attaching the handle.
Air Motor
Contact
Arm
3. Make sure the handle is tight enough to
not come loose during operations.
Figure 3. Installing the contact arm.
3. Tighten the cap screw to secure the
contact arm assembly to the air motor.
Note: The angle of the contact arm will
later be adjusted to suit the user's pref-
erence and specific sanding task per-
formed. This procedure is discussed in
Adjustments on Page 8.
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OPERATIONS
Sanding Belt
Installing the Sanding Belt
1. DISCONNECT THE SANDER FROM
THE AIR SUPPLY!
2. Place the sanding belt over the contact
wheel, as shown in Figure 5.
Read the manual before operation.
Become familiar with this tool, its
safety instructions, and its operation
before beginning any work. Serious
personal injury may result if safety
or operational information is not
understood or followed.
Belt
Contact Wheel
Figure 5. Preparing the sanding belt.
Like all tools there is potential danger
when operating this tool. Accidents
are frequently caused by lack of
familiarity or failure to pay attention.
If normal safety precautions are
overlooked or ignored, serious
personal injury may occur.
3. Compress the contact arm shaft by
pressing the contact wheel towards
the drive wheel. Slide the belt over the
drive wheel until it is centered, then
release pressure (Figure 6).
Contact Wheel
To avoid accidental starting,
disconnect the sander from the air
supply when it is not in use.
Belt
Drive Wheel
Figure 6. Attaching the sanding belt.
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4. Attach the belt guard with the M4-.7 x 6
cap screw, as shown in Figure 7.
EYE/LUNG/EAR
INJURY HAZARD!
Wear protective
equipment when
using this tool.
Belt Guard
ACCIDENTAL
START HAZARD!
Disconnect before
service or tool
changes.
Cap Screw
AIR PRESSURE
HAZARD!
Figure 7. Installing guard.
Never exceed the
maximum PSI
rating for tool.
Replacing the Sanding Belt
When the sanding belt loses its
effectiveness, is damaged, or shows signs
of excessive wear, it must be replaced.
Operation
To operate the sander:
To replace the sanding belt:
1. Connect the sander to compressed air
regulated at 70-90 PSI.
1. DISCONNECT THE SANDER FROM
THE AIR SUPPLY!
2. Hold the sander securely and push the
throttle lever to operate. Turn the valve
screw to set the maximum belt speed
(Figure 9).
2. Remove the belt guard.
3. Compress the contact arm shaft by
pressing the contact wheel towards the
drive wheel. Slide the belt off the drive
wheel, then release pressure (Figure
8).
Throttle Lever
Contact Wheel
Valve Screw
Belt
Figure 9. Sander controls.
3. Release pressure on the throttle lever
to stop the sander.
Drive Wheel
Figure 8. Removing the sanding belt.
4. To install the new belt, refer to
"Installing the Sanding Belt" on Page
6.
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Adjusting the Belt Tracking
Adjustments
The sanding belt must be centered on
the contact wheel to avoid damaging the
sander and to allow for optimal sanding.
Adjusting the Contact Arm and
Handle
To adjust the belt tracking:
1. Loosen the cap screws shown in Figure
10.
1. Connect the sander to compressed air
regulated at 70-90 PSI.
2. Hold the sander firmly and press the
throttle lever to turn it ON. Once the
belt has reached full speed, turn the
adjustment knob to adjust the belt
tracking. Turning the knob clockwise
will move the belt towards the adjusting
knob and turning the knob counter-
clockwise will move the belt away from
the adjusting knob (Figures 12 & 13).
Cap Screws
Figure 10. Sander adjustments.
2. Rotate the handle and contact arm to
the desired position, then tighten the
cap screws.
Note: By rotating the contact arm
and handle, the Model H8253 can
be adjusted for right or left hand use
(Figure 11).
Adjustment Knob
Figure 12. Belt tracking.
Incorrect Belt
Tracking
Correct Belt
Tracking
Left Hand Use
Right Hand Use
Figure 11. Left hand/right hand setup.
Figure 13. Belt tracking.
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MAINTENANCE
Cleaning
Lubrication
The air sander MUST have 2-6 drops of
oil dropped directly into the air inlet before
and after each use and before storage.
Keeping the sander clean is vital to its
operation and leads to longer tool life.
After every use, clean and inspect the
sander.
After oiling, remove the sanding belt, then
run the sander to purge excess oil. Wipe
the tool down with a rag, re-install the
sanding belt, then begin sanding.
•
Wipe the housing with a dry cloth, or
blow off the dust and debris with com-
pressed air.
Another option to manual oiling would be
to install a lubricator in your air compressor
line. If your air compressor line already has
a lubricator, then regular lubrication of your
sander will not be necessary. Just make
sure there is always oil in the lubricator.
•
Check for damage to tooling, hoses,
housing or other accessories.
Do not allow dust, chips, sand, etc. into
the air connectors or into the body of the
sander air motor; this may result in leaks
and damage to the sander and the air
couplings.
Figure 14. Lubricating sander via air inlet.
Always disconnect air from sander
whenever servicing! During mainte-
nance, a sander connected to air may
start accidentally, causing personal
injury!
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H8253 MAIN BREAKDOWN
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H8253 MAIN PARTS LIST
REF PART #
DESCRIPTION
1
PH8253001
PH8253002
PH8253003
PH8253004
PH8253005
PH8253006
PH8253007
PH8253008
PH8253009
PFH41M
CONTACT ARM ASSEMBLY
PLUG
2
3
GUIDE POST
4
COMPRESSION SPRING
TENSION ARM
5
6
KNOB M4-.7 X 22
7
COMPRESSION SPRING
TENSION SHAFT
8
9
DUST COVER
10
11
12
13
14
15
16
17
18
19
20
21
22
23
FLAT HD SCR M4-.7 X 16
MAIN HOUSING
PH8253011
PN06M
HEX NUT M5-.8
PH8253013
PSB110M
BELT GUARD
CAP SCREW M4-.7 X 6
BALL BEARING R4RS
HANDLE ASSEMBLY
CAP SCREW M4-.7 X 14
MOTOR LOCK
PH8253015
PH8253016
PSB41M
PH8253018
PH8253019
PH8253020
PH8253021
PH8253022
PH8253023
HANDLE SUPPORT
MOTOR ASSEMBLY
CONTACT WHEEL
CONTACT WHEEL SHAFT
SANDING BELT 1 X 18"
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-11-
H8253 MOTOR BREAKDOWN
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H8253 MOTOR PARTS LIST
REF PART #
DESCRIPTION
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
PH8253101
PH8253102
PH8253103
PH8253104
PH8253105
P6000
DRIVE WHEEL
EXHAUST COVER
FELT SILENCER
AIR CONTROL RING
ROTOR NUT
BALL BEARING 6000ZZ
SHIM
PH8253107
PH8253108
PH8253109
PH8253110
PH8253111
PH8253112
PH8253113
PH8253114
P608
SPACER
FRONT BEARING CUP
PIN
CYLINDER
ROTOR
BLADE
REAR BEARING CUP
BALL BEARING 608ZZ
MOTOR HOUSING
SPECIAL SCREW
GASKET
PH8253116
PH8253117
PH8253118
PH8253119
PH8253120
PH8253121
PH8253122
PH8253123
PH8253124
PRP02
LOCK RING
COLLAR
INTERNAL GASKET
INSERT
HANDLE HOUSING
VALVE STEM
ROLL PIN 1/8 X 3/4
THROTTLE LEVER
SPEED REGULATOR
O-RING 8.8 X 1.9 P9
O-RING 8 X 1
PH8253126
PH8253127
PORP009
PH8253129
PR16M
EXT RETAINING RING 9MM
TIP VALVE SEAL
TIP VALVE
PH8253131
PH8253132
PH8253133
PORP016
COMPRESSION SPRING
O-RING 15.8 X 2.4 P16
INLET FITTING
O-RING REPLACEMENT KIT
PH8253135
PH8253136
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