Grizzly Sander H8253 User Manual

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  
 
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.  
Model H8253 Air Belt Sander  
-1-  
 
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.  
-2-  
Model H8253 Air Belt Sander  
 
INTRODUCTION  
Foreword  
Specifications  
The  
specifications,  
details,  
and  
Motor Speed........................... 18,000 RPM  
Air Consumption............................ 28 CFM  
Air Inlet ......................................14"-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  
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
F
G
Figure 1. Model H8253 Inventory.  
Model H8253 Air Belt Sander  
-3-  
 
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.  
-4-  
Model H8253 Air Belt Sander  
 
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.  
Model H8253 Air Belt Sander  
-5-  
 
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.  
-6-  
Model H8253 Air Belt Sander  
 
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.  
Model H8253 Air Belt Sander  
-7-  
 
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.  
-8-  
Model H8253 Air Belt Sander  
 
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!  
Model H8253 Air Belt Sander  
-9-  
 
H8253 MAIN BREAKDOWN  
-10-  
Model H8253 Air Belt Sander  
 
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"  
Model H8253 Air Belt Sander  
 
-11-  
H8253 MOTOR BREAKDOWN  
-12-  
Model H8253 Air Belt Sander  
 
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  
Model H8253 Air Belt Sander  
 
-13-  
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