Grizzly Air Compressor H3372 User Manual

3 HP AIR COMPRESSOR  
MODEL H3372  
INSTRUCTION MANUAL  
COPYRIGHT © APRIL, 2003 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.  
PRINTED IN CHINA  
ONLINE MANUAL DISCLAIMER  
THE INFORMATION IN THIS MANUAL REPRESENTS THE CONFIGURATION OF THE MACHINE  
AS IT IS CURRENTLY BEING SHIPPED. THE MACHINE CONFIGURATION CAN CHANGE AS  
PRODUCT IMPROVEMENTS ARE INCORPORATED. IF YOU OWN AN EARLIER VERSION OF  
THE MACHINE, THIS MANUAL MAY NOT EXACTLY DEPICT YOUR MACHINE . CONTACT CUS-  
TOMER SERVICE IF YOU HAVE ANY QUESTIONS ABOUT DIFFERENCES. PREVIOUS VER-  
SIONS ARE NOT AVAILABLE ONLINE.  
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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 progres-  
sion of symbols is described below. Remember that safety messages by them-  
selves do not eliminate danger and are not a substitute for proper accident pre-  
vention 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 infor-  
mation about proper operation of the equipment.  
NOTICE  
Safety Instructions For Pneumatic Tools  
5. KEEP CHILDREN AND VISITORS  
AWAY. All children and visitors  
should be kept at a safe distance  
from work area.  
1. KEEP ALL SAFETY DEVICES IN  
PLACE and in working order.  
2. REMOVE ADJUSTING KEYS AND  
WRENCHES. Form  
a
habit of  
6. MAKE  
WORKSHOP  
CHILD  
checking to see that keys and  
adjusting wrenches are removed  
from tool before operation.  
PROOF with padlocks, master  
switches, or by removing air hoses  
from tools.  
3. KEEP WORK AREA CLEAN.  
Cluttered areas and benches invite  
accidents.  
7. DO NOT FORCE TOOL. It will do  
the job better and safer at the rate  
for which it was designed.  
4. DO NOT USE IN DANGEROUS  
ENVIRONMENT. DO NOT use  
pneumatic tools in damp or wet  
locations, or where any flammable  
or noxious fumes may exist. Keep  
work area well lighted.  
8. USE THE RIGHT TOOL. DO NOT  
force tool or attachment to do a job  
for which it was not designed.  
9. DO NOT USE UNDER THE INFLU-  
ENCE OF DRUGS OR ALCOHOL.  
H3372 3 HP Air Compressor  
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Safety Instructions For Pneumatic Tools  
18. DISCONNECT TOOLS before ser-  
10. USE PROPER AIR HOSE for the  
tool. Make sure your air hose is in  
good condition and is long enough to  
reach your work without stretching.  
vicing and changing accessories.  
19. USE  
THE  
RECOMMENDED  
Consult the  
ACCESSORIES.  
owner’s manual for recommended  
accessories. The use of improper  
accessories may cause risk of  
injury.  
11. WEAR PROPER APPAREL. DO  
NOT wear loose clothing, gloves,  
neckties, rings, bracelets, or other  
jewelry which may get caught in  
moving parts. Non-slip footwear is  
recommended. Wear a protective  
hair covering to contain long hair.  
20. CHECK  
DAMAGED  
PARTS.  
Before further use of the tool, a  
guard or other part that is damaged  
should be carefully checked to  
determine that it will operate prop-  
erly and perform its intended func-  
tion. Check for alignment of moving  
parts, binding of moving parts,  
breakage of parts, mounting, and  
any other conditions that may affect  
its operation. A guard or other part  
that is damaged should be properly  
repaired or replaced.  
12. ALWAYS USE SAFETY GLASSES.  
Also use a face or dust mask if cut-  
ting operation is dusty. Everyday  
eyeglasses only have impact resis-  
tant lenses, they are NOT safety  
glasses.  
13. WEAR APPROVED HEARING  
PROTECTION.  
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.  
21. NEVER LEAVE UNATTENDED  
TOOL CONNECTED TO AIR.  
Disconnect the air hose and DO  
NOT leave tool until it is relieved of  
any built up pressure.  
15. DO NOT OVERREACH. Keep prop-  
er footing and balance at all times.  
16. MAINTAIN TOOLS WITH CARE.  
Keep tools lubricated and clean for  
best and safest performance. Follow  
instructions for lubricating and  
changing accessories.  
22. NEVER ALLOW UNTRAINED  
USERS TO USE THIS TOOL  
WHILE UNSUPERVISED.  
23. IF YOU ARE UNSURE OF THE  
INTENDED OPERATION, STOP  
USING THE TOOL. Seek formal  
training or research books or maga-  
zines that specialize in pneumatic  
tools.  
17. REDUCE THE RISK OF UNINTEN-  
TIONAL STARTING. DO NOT carry  
tool with hand on trigger and always  
disconnect from air when not in use.  
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7. DRAIN TANK DAILY OR AT THE  
END OF EACH USE to avoid tank  
corrosion and possible tank rupture.  
8. AVOID TOUCHING THE TOP OF  
THE MOTOR HOUSING, it will  
become hot during operation.  
9. MAKE SURE TO ADD OIL! Use  
compressor oil or a non-detergent 30  
weight oil.  
10. NEVER LEAVE COMPRESSOR  
TURNED ON WHEN NO ONE IS  
AROUND! A leak could develop caus-  
ing compressor to run continuously  
causing overheating and possibly a  
fire.  
11. NEVER AIM THE AIR NOZZLE  
DIRECTLY AT YOURSELF OR OTH-  
ERS. Pressurized air can break or  
bruise the skin.  
Additional Safety For  
Air Compressors  
1. READ THIS ENTIRE MANUAL  
BEFORE  
OPERATING  
THE  
COMPRESSOR.  
2. OPERATE THE COMPRESSOR IN  
A WELL VENTILATED AREA free  
of acids, vapor, explosive gases and  
flammable or unstable materials.  
3. DO NOT PULL ON THE GAUGES  
OR REGULATORS TO MOVE THE  
COMPRESSOR!  
4. DO NOT USE THE COMPRESSOR  
FOR FILLING BREATHING OR DIV-  
ING APPARATUS. Compressed air  
from this compressor cannot be used  
for pharmaceutical, food or health  
requirements without further treat-  
ment.  
5. NEVER TRANSPORT THE COM-  
PRESSOR UNDER PRESSURE.  
Always release the pressure in the  
storage tanks before moving.  
12. NEVER LOAD YOUR COMPRES-  
SOR PAST THE MAXIMUM PSI  
RATING OF 115 PSI.  
6. NEVER RUN THE COMPRESSOR  
BEYOND THE ADVISED DUTY  
CYCLE! The advised duty cycle is  
described on page 7.  
Always be aware of the duty cycle  
for your air compressor. Failure to  
operate the air compressor proper-  
ly could result in overheating and  
motor seizure. There could also be  
risk of fire hazard due to overheat-  
ing. Be sure to use a compressor  
capable of handling the air demand  
of connected tools  
Operating this compressor can pro-  
pel objects into the air, causing  
immediate eye damage. To protect  
yourself, always wear American  
National Standards Institute (ANSI)  
approved safety glasses or goggles  
when operating this equipment.  
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INTRODUCTION AND SET UP  
Commentary  
If you have any comments regarding this  
manual, please write to us at the following  
address:  
We are proud to offer the Grizzly Model  
H3372 3 HP Air Compressor. This model  
is part of a growing Grizzly family of fine  
Grizzly Industrial, Inc.  
Technical Documentation  
P.O. Box 2069  
C
/O  
power tools. When used according to the  
guidelines set forth in this manual, you can  
expect years of trouble-free, enjoyable  
operation and proof of Grizzly’s commit-  
ment to customer satisfaction.  
Bellingham, WA 98227-2069  
Most important, we stand behind our tools.  
If you have any service questions or parts  
requests, please call or write us at the  
location listed below.  
The Model H3372 features a powerful  
220V 3 HP motor, two cylinder aluminum  
pump with cast iron cylinder liners, an  
incredible 10.9 CFM@ 40 PSI, 9.1 CFM  
@90 PSI, 11 gallon welded steel tank, and  
a 115 PSI maximum working pressure.  
The Model H3372 compressor fills its 11  
gallon tank from 0 to 115 PSI in a little over  
a minute!  
Grizzly Industrial, Inc.  
1203 Lycoming Mall Circle  
Muncy, PA 17756  
Phone: (570) 546-9663  
Fax: (800) 438-5901  
We are pleased to provide this manual  
with the Model H3372. It was written to  
encourage safety considerations and  
guide you through general operating pro-  
cedures and maintenance. This manual  
represents our effort to produce the best  
documentation possible.  
The specifications, details, and pho-  
tographs in this manual represent the  
Model H3372 as supplied when the manu-  
al was prepared. However, owing to  
Grizzly’s policy of continuous improve-  
ment, changes may be made at any time  
with no obligation on the part of Grizzly.  
Read the manual before assembly  
and 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 infor-  
mation is not understood or followed.  
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Unpacking  
Site Placement  
When determining where to set up the  
compressor in the shop, or when taking the  
air compressor to a job site, the most  
important consideration is access to an  
adequate and properly fused power sup-  
ply. Refer to Circuit Requirements for the  
needs of your particular compressor.  
This air compressor is shipped from the  
manufacturer in a carefully packed carton.  
If you discover the machine is damaged  
after you have signed for delivery, and the  
truck and driver are gone, you will need to  
file a freight claim with the carrier. Save the  
containers and all packing materials for  
possible inspection by the carrier or its  
agent. Without the packing materials, filing  
a freight claim can be difficult. If you need  
assistance determining whether you need  
to file a freight claim, or with the procedure  
to file one, please contact our Customer  
Service at (570) 546-9663.  
Also, make sure the compressor is not  
operating in an environment where there  
are any explosive, flammable or caustic  
fumes or gases. A clear and well ventilated  
area is best for its safe operation.  
Place the compressor on a solid and level  
surface. Make sure that the hoses you  
attach to your pneumatic device will be  
unrestricted in movement and not subject  
to being run over by vehicles or punctured  
by any sharp objects in the area.  
Since air compressors are often used for a  
sustained period of time, sometimes in  
restricted areas, it is also best to wear ear  
protection to avoid long term exposure to  
the sound of the electric motor and com-  
pression pump.  
The Model H3372 represents a heavy  
load at 142 pounds. Seek assistance  
before moving.  
Do not place the compressor next to  
any flammable liquids or gas! The  
compressor cylinder head and feed  
pipe can reach high temperatures and  
could cause the flammable gas to  
ignite. Keep work area clear from  
flammable gas when using the com-  
pressor.  
Long term exposure to this machine  
may cause hearing loss. Wear  
approved hearing protection while  
operating this machine to minimize  
this risk!  
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CIRCUIT REQUIREMENTS  
220V Operation  
Grounding  
In the event of an electrical short, ground-  
ing reduces the risk of electric shock by  
providing a path of least resistance to dis-  
perse electric current. These machines are  
equipped with power cords having an  
equipment-grounding conductor. See  
Figure 1. The outlet must be properly  
installed and grounded in accordance with  
all local codes and ordinances.  
Wiring:  
The Model H3372 3 HP Air Compressor is  
wired for 220V operation.  
Amperage Draw  
The Model H3372 has a 3 HP motor and  
draws the following amperage.  
H3372 Motor.................................18 Amps  
Circuit Breaker Requirements  
Install your air compressor on a dedicated  
circuit to reduce the possibility of overload-  
ing the circuit and tripping the circuit break-  
er. However, if an unusual load does not  
exist, and the circuit breaker still trips, have  
the circuit inspected by a qualified electri-  
cian. Never use a larger circuit breaker  
than stated below, or you will increase the  
risk of fire.  
Figure 1. Ground plug configuration.  
Circuit Breaker...........20 Amp Double Pole  
Extension Cords  
If you find it necessary to use an extension  
cord with your compressor, make sure the  
cord is rated Standard Service (grade S) or  
better. The extension cord must also con-  
tain a ground wire and plug pin. Always  
repair or replace extension cords when  
they become worn or damaged.  
Potential for electrical shock haz-  
ard, this equipment must be  
grounded. Verify that any existing  
electrical outlet and circuit you  
use is actually grounded.  
Overheating, short circuit and fire  
damage will result form inadequate  
wiring. Follow the guidelines in this  
section.  
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PREPARING FOR USE  
Before using your Grizzly Air  
Compressor, follow these steps :  
NOTICE  
1. Remove all packing materials and any  
protective plastic bags, zip-tie labels  
or tags from the compressor cylinder  
head or oil plug.  
The machine should never be run  
without a full oil reservoir. The oil  
provides lubrication to the cylinder  
rings which deliver the compressed  
air. Severe damage to the internal  
moving parts can occur if there is  
not adequate oil flow. Check the oil  
level frequently, and change the oil  
on a regular schedule.  
2. Be sure the air filter is attached to the  
cylinder head as shown in Figure 2.  
Duty Cycle  
The Model H3372 3 HP Air Compressor  
should not be operated on more than a  
50% duty cycle. This means an air com-  
pressor that pumps air for over 30 minutes  
in one hour is considered misuse. This  
could mean that the air compressor is  
undersized for the required air demand.  
The maximum compressor pump time per  
hour is 30 minutes.  
Figure 2. Air filter attached to  
cylinder head.  
3. ADD OIL TO THE CRANKCASE. Oil  
has been supplied with your air com-  
pressor. The oil level should be in the  
center of the sight gauge shown in  
Figure 3.  
Always be aware of the duty cycle for  
your air compressor. Failure to oper-  
ate the air compressor properly  
could result in overheating and  
motor seizure. There could also be  
risk of fire hazard due to overheat-  
ing. Be sure to use a compressor  
capable of handling the air demand.  
Figure 3.  
Proper oil level.  
4. Make sure the drain valve under the  
air tank is closed.  
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STARTING  
To start the air compressor:  
Check the pressure gauge to see that the  
tank pressure climbs to approximately 100-  
115 PSI or around 8 BAR, then automati-  
cally turns off.  
1.  
Make sure the compressor switch is  
in the OFF position (knob with red  
cap above pressure gauges shown  
in Figure 4 pressed down) before  
connecting the power supply.  
Note—If the compressor does not auto-  
matically kick off, flip the ON/OFF switch to  
OFF before pressure gets too high. See  
the Pressure Regulator sub-section.  
Operating this equipment has the  
potential for flying debris to cause  
eye injury. Always wear safety glass-  
es or goggles when operating equip-  
ment. Everyday glasses or reading  
glasses only have impact resistant  
lenses, they are not safety glasses.  
Be certain the safety glasses you  
wear meet the appropriate standards  
of the American National Standards  
Institute (ANSI).  
Figure 4. ON/OFF button.  
2.  
Close the drain valve, shown in  
Figure 5, so the tank can build up  
pressure.  
Figure 5. Drain valve location.  
3.  
4.  
5.  
Double check the oil level to make  
sure it is at the proper height.  
Connect the compressor to the  
power supply.  
Pull the switch up to the ON position  
to start compressor.  
-8-  
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AIR CONTROL  
Air Release  
Delivered Pressure  
The tank pressure is displayed on the left  
pressure gauge, and the air to be delivered  
to the tool is displayed on the right pres-  
sure gauge shown in Figure 6.  
There are two ways to release air from the  
compressor tank other than through your  
regulator and the use of air tools:  
—The drain valve.  
—The safety drain valve.  
To release air by using the drain valve,  
simply turn the release nut to allow air to  
flow out of the tank. The drain valve is  
shown in Figure 5. The drain valve is also  
used to drain condensation that builds up  
in the tank.  
The safety valve automatically releases  
pressure if the tank reaches 130 PSI.  
Figure 6. Pressure gauges.  
To manually release the air in the tank  
by using the safety drain valve:  
To control the air delivery to your tool:  
1. Locate the safety drain valve on the  
tank. The drain valve is shown below  
in Figure 8.  
1. Adjust the air control knob, shown in  
Figure 7, to set the PSI that will be  
delivered to your tool. Turn the knob  
clockwise to increase the pressure  
and counter-clockwise to decrease  
the pressure.  
Figure 8. Safety drain valve.  
2. Pull the metal ring on top of the safe-  
ty valve to bleed pressure from the  
tank. Note—The ring is preset to  
release air if the tank exceeds its  
maximum pressure of 130 PSI. DO  
NOT try to adjust the safety valve!  
Figure 7. Air control knob.  
Note—The air tool that you attach to the air  
compressor should have a preferred PSI  
operating level. Set the pressure to be  
delivered to the tool according to this pre-  
ferred level. Understand the duty cycle  
of the air compressor that is described  
on page 7.  
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Tank Pressure  
Regulator  
To adjust the pressure regulator:  
1. Unplug the air compressor from  
the power supply.  
The pressure regulator has been factory  
set for the highest quality operating perfor-  
mance.  
2. Make sure the compressor switch is in  
the OFF position.  
3. Drain the pressure from the tank.  
The pressure regulator adjusts the desired  
PSI range where the air compressor kicks  
in and out to keep the tank pressurized for  
the best operating performance.  
4. Remove the black ON/OFF switch  
cover by removing the screw which is  
in the recess on the top of the cover.  
Pull the black cover up and set it  
aside.  
NOTICE  
HP Air  
Compressors have been factory set  
to kick off at the proper PSI range.  
Only attempt to adjust the pressure  
regulator if your air compressor  
does not reach or pressurizes  
beyond the proper PSI level.  
5. Turn the pressure adjustment bolt  
(Figure 9) a half turn clockwise to  
increase the tank pressure and a half  
turn counter-clockwise to decrease  
the pressure.  
The Model H3372  
3
6. Connect the compressor to the power  
supply and start the compressor.  
7. If the PSI level still needs adjustment  
repeat steps 1 through 6.  
8. Replace the cover when the proper  
adjustments have been made.  
Figure 9. Pressure Regulator.  
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CONNECTING TOOLS  
To connect air tools to your air com-  
pressor:  
Consideration should also be given to the  
type of usage. A nailer or staple gun uses  
air in short bursts and it is easier for the  
compressor to maintain pressure. A paint  
sprayer or grinder tends to use a more  
continuous stream of air as these tools are  
run for longer time periods. It is always  
better to oversize a compressor to allow  
for variation in the type of usage and the  
number of tools to be powered. Air tools  
being operated with insufficient air volume  
will not perform their function satisfactorily.  
1. Make sure the compressor model you  
use has a sufficient cubic feet per  
minute (CFM) output for the air tool  
you plan to connect. (Most air tools  
will have an air requirement stated in  
terms of a specific CFM at a specific  
pressure.)  
2. The compressor should put out a  
higher CFM than the tool requires.  
—If you are connecting multiple tools  
that will be used simultaneously, then  
the CFM for each tool should be  
added together and compared to the  
compressor output value.  
3. Connect the tool, using a good quality  
air line with an adequate length to  
reach from the compressor to the  
point of use.  
NoteQuick-connect couplers, shown in  
Figure 10, are a good option for fast and  
sure connection of tools and air hoses.  
This accessory and many like it can be  
found in the Grizzly Catalog.  
Always disconnect air hose from  
tools whenever not in use or while  
servicing! During maintenance, a  
tool connected to air may operate  
accidentally, causing serious per-  
sonal injury!  
The Model H3372  
3
HP Air  
Compressors are specifically  
designed for air tool operation. DO  
NOT MODIFY OR USE THIS  
MACHINE FOR ANY OTHER PUR-  
POSE. Modifications or improper  
use of this tool will void the warran-  
ty. If you are confused about any  
aspect of this machine, DO NOT use  
it until you have answered all your  
questions. Serious personal injury  
may occur.  
Figure 10. Quick connect couplers.  
Make certain the air hose will not be placed  
in a position where it can become con-  
stricted or cut by a sharp object. Note—  
Running over a hose with heavy vehicles  
may not cause an immediate leak, but it  
will shorten the life of the hose.  
-11-  
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MAINTENANCE  
3. Clean off cylinder head cooling fins of  
Before Each Use  
any dirt which might hamper air flow.  
4. Check for worn or damaged cords  
Regular periodic maintenance on your Air  
Compressor will ensure its optimum perfor-  
mance. Make a habit of inspecting the fol-  
lowing items before each time you use the  
air compressor.  
and plugs.  
5. Check the air pressure in the tires  
when transporting the air compressor.  
6. Check for any other condition that  
could hamper the safe operation of  
this machine.  
Check the following items:  
1. Check Oil Level! Use the sight gauge  
on the bottom of the crankcase to  
make sure the oil level is at the prop-  
er height.  
Always wear safety glasses and use  
extreme caution when working  
around compressed air. The force of  
the air stream can cause small bits  
of debris to become airborne and  
cause potential injury to the eyes or  
other parts of the body.  
2. Drain the tanks of any condensation  
by opening the drain valve on the bot-  
tom of the tank. Note—Depending  
upon the amount of use and the  
weather conditions, a certain amount  
of condensed water may be released.  
For longevity of the compressor seals  
and the air tools you connect, it is best  
to keep the tanks free of water. The  
tanks are best drained if the drain  
valve is open when the system is  
pressurized. Once water has stopped  
coming out, you can close the drain  
valve.  
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3. Remove the V-belt from the motor pul-  
Changing V-belt  
ley and fly pulley.  
4. Install the new V-belt.  
To change the V-belt drive on your air  
compressor:  
5. Reposition the motor in its original  
place so the belt is tensioned, and  
secure the four mounting bolts loos-  
ened in step 2.  
1. Remove the belt guard from the air  
compressor shown in Figure 11. The  
guard is attached to the compressor  
frame by the two mounting bolts  
shown in Figure 11.  
6. A properly tensioned V-belt will have  
about a 12 inch deflection as shown in  
Figure 13.  
Replace the belt  
guard.  
7. Replace belt gaurd.  
1
2  
Inch of Deflection  
Figure 11. Belt Guard and  
mounting bolts.  
2. Loosen the four nuts (one side shown  
in Figure 12) that secure the motor to  
the compressor frame so the motor  
can slide towards crankcase, relieving  
the tension on the V-belt.  
Figure 13. V-belt deflection.  
Make sure the V-belt is properly ten-  
sioned. If the V-belt is too tight, the  
motor could overheat and cause  
machine damage or fire. If the V-belt  
is too loose, the belt will slip on the  
pulley and cause belt damage and  
compressor inefficiency.  
Figure 12. Mounting bolt locations.  
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After First 50  
Hours Of Use  
Weekly  
If the compressor is used on a daily  
basis, perform the following checks  
each week:  
After the first 50 working hours or 30  
days, whichever comes first, perform  
the following maintenance:  
Rinse the air filter foam element in  
water.  
Replace the oil in the motor with com-  
pressor oil (use ISO 100 of SAE 30W  
viscosity, non detergent type).  
Check for loose bolts or fittings.  
Make sure that all the fittings are tight.  
Remove the air filter foam element  
shown in Figure 14 and rinse it out  
with water. Allow it to dry and re-  
install.  
The Model H3372 3 HP Air  
Compressors  
are  
specifically  
designed for air tool operation. DO  
NOT MODIFY AND/OR USE THIS  
MACHINE FOR ANY OTHER PUR-  
POSE. Modifications or improper  
use of this tool will void the warran-  
ty. If you are confused about any  
aspect of this machine, DO NOT use  
it until you have answered all your  
questions. Serious personal injury  
may occur.  
Figure 14. Air filter foam element  
Blow out any accumulated dirt  
between the cylinder cooling fins.  
Like all power tools, there is danger  
associated with operating this  
equipment. Accidents are frequently  
caused by lack of familiarity or fail-  
ure to pay attention. Use this tool  
with respect and caution to lessen  
the possibility of operator injury. If  
normal safety precautions are over-  
looked or ignored, serious personal  
injury many occur.  
-14-  
H3372 3 HP Air Compressor  
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Every 300 Hours  
Storage  
When storing your air compressor fol-  
low these guidelines:  
After every 300 hours or 3 months of  
regular operation, perform the following  
maintenance items:  
1. Set the ON/OFF button to OFF.  
Change the compressor motor oil.  
Use compressor oil or a non-deter-  
gent 30 weight oil.  
2. Turn the regulator counter-clockwise  
to set the delivery pressure to zero.  
3. Disconnect air tools or accessories.  
Rinse the air filter foam element in  
water.  
4. Pull the safety drain valve ring to  
bleed excess pressure from tank. The  
pressure gauge for the tank should  
read 15-20 PSI.  
Check for air leaks and correct as  
needed.  
Clean the cylinder head fins for prop-  
er cooling.  
5. Drain water from the tank by opening  
the drain valve on the bottom of the  
tank.  
Check for loose bolts or fittings.  
6. Close the drain valve when all the  
water has been released.  
7. Store the air compressor in its normal  
operating position in a cool protected  
area.  
Like all power tools, there is danger  
associated with operating this  
equipment. Accidents are frequently  
caused by lack of familiarity or fail-  
ure to pay attention. Use this  
machine with respect and caution to  
lessen the possibility of operator  
injury. If normal safety precautions  
are overlooked or ignored, serious  
personal injury many occur.  
NOTICE  
Water will condense in the air com-  
pressor tank. Water left in the tank  
can cause the tank to weaken and  
corrode, increasing the risk of tank  
rupture.  
-15-  
H3372 3 HP Air Compressor  
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TROUBLESHOOTING  
ACTION  
CAUSE  
PROBLEM  
1. Low voltage.  
2. Open circuit in  
motor, switch or  
cord.  
1. Check power line for proper voltage.  
2. Inspect all lead connections on motor,  
switch and cord for loose or open connec-  
tions.  
Pump motor  
will not start.  
3. Tank already pres-  
surized.  
3. Motor will not start if tank pressure is too  
high.  
4. Thermal overload  
switch.  
4. Thermal overload switch has tripped, wait  
for motor to cool, then reset switch by  
pressing red button.  
1. Short circuit in line  
cord or plug.  
1. Inspect cord or plug for damaged insula-  
tion and shorted wires.  
Pump motor  
starts;  
but  
2. Short circuit in motor  
or loose connec-  
tions.  
2. Inspect all connections on motor for loose  
or shorted terminals or worn insulation.  
fuses blow or  
circuit break-  
ers trip.  
3. Incorrect fuses or  
circuit breakers in  
power line.  
3. Install correct fuses or circuit breakers.  
1. Air leaks in flexible  
hoses.  
1. Check air hoses and all connections for  
leaks.  
Low pressure  
at the tool.  
2. Pressure gauge bad.  
2. Check pressure in line with known good  
gauge.  
3. Pressure regulator  
bad.  
3. Adjust pressure regulator, if no improve-  
ment inspect regulator for leaks or  
replacement.  
4. Hose is too long.  
4. Install a shorter hose.  
1. Air leaks in tanks or  
delivery pipes.  
1. Check air tanks, pipes and all connections  
for leaks.  
Low pressure  
at the tanks.  
2. Drain valve open.  
3. Safety valve releas-  
ing below 125 PSI.  
4. Air filter clogged.  
5. Gaskets leaking.  
2. Close drain valve.  
3. Replace safety valve.  
4. Inspect and clean air filter.  
5. Check gaskets on cylinder head assem-  
bly, repair or replace as needed.  
6. Worn rings.  
6. Inspect and replace pump piston rings.  
1. Improper oil level.  
2. Air filter clogged.  
1. Check oil level and add oil.  
2. Inspect and clean air filter.  
3. Inspect and repair piston and connecting  
rod.  
Compressor  
knocking.  
3. Piston  
loose.  
assembly  
-16-  
H3372 3 HP Air Compressor  
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ACTION  
PROBLEM  
CAUSE  
1. Cooling fins dirty.  
2. Air filter clogged.  
3. Compressor  
exceeding its duty-  
cycle.  
1. Clean cylinder fins and motor area.  
2. Inspect and clean air filter.  
3. Do not allow the compressor to run over  
its recommended duty cycle.  
Motor runs  
hot.  
is  
Pressure relief  
1. Turn compressor off, unplug from power  
supply, drain tank. DO NOT USE until  
switch is repaired or replaced.  
2. Relief valve is relieving pressure too  
early, test pressure relief and repair or  
replace.  
1. Faulty  
pressure  
switch, unit is trying  
to overpressure the  
tank.  
valve  
open  
stays  
and  
motor won’t  
stop running.  
2. Faulty  
relief valve.  
pressure  
Air leaks from  
p r e s s u r e  
switch.  
1. Clean dirt or debris from rubber mem-  
brane of check valve after removing top  
nut.  
1. Faulty check valves.  
2. faulty  
switch.  
pressure  
2. Repair or replace pressure switch.  
Air is dirty or  
has excessive  
moisture.  
1. Open drain cocks on both tanks and make  
certain all condensation water is drained  
out.  
1. Tank is not drained.  
2. Remove delivery pipes, clean out and  
replace.  
2. Delivery pipes are  
dirty.  
H3372 3 HP Air Compressor  
-17-  
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Model H3372 3 HP Air Compressor  
36  
47  
35  
37  
48  
49  
18  
38  
19  
34  
51  
50  
20  
22  
23  
33  
29  
32  
76  
94  
21  
27  
3
77  
31  
5
90  
78  
30  
4
7
29  
28  
6
93  
79  
80  
26  
25  
1
2
11  
24  
44  
43  
10  
39  
40  
9
69  
68  
9
42  
41  
12  
8
67  
13  
14  
60  
61  
59  
65  
63  
91  
15  
92  
16  
64  
63  
66  
66  
52  
58  
65  
64  
17  
65  
63  
57  
55  
54  
53  
64  
56  
81  
71  
46  
45  
75  
74  
73  
89  
72  
65  
63  
82  
70  
84  
63  
62  
88  
96  
83  
87  
85  
86  
95  
-18-  
H3372 3 HP Air Compressor  
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DESCRIPTION  
CRANK  
BEARING 6202  
REF  
PART #  
1
2
PH3372001  
P6202  
3
4
5
6
PH3372003  
PH3372004  
PSB29M  
PLW03M  
PN01M  
CONNECTING ROD  
ROD BEARING  
CAP SCREW M6-1 X 40  
LOCK WASHER 6MM  
HEX NUT M6-1.0  
7
8
9
PH3372008  
PH3372009  
PH3372010  
PH3372011  
PH3372012  
PW01M  
CRANKCASE  
GASKET  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
32  
33  
34  
35  
36  
37  
38  
39  
CRANK CASE FRONT COVER  
OIL SEAL B25 X 47 X 7  
REAR COVER  
FLAT WASHER 8MM  
HEX BOLT M8-1.25 X 20.  
GASKET  
OIL SIGHT GLASS G12  
HEX BOLT 18 MPT  
COMPRESSION RING  
COMPRESSION RING  
OIL RING  
PB09M  
PH3372015  
PH3370024  
PH3372017  
PH3372018  
PH3372019  
PH3372020  
PH3372021  
PH3370017  
PR49M  
PH3372024  
PH3372025  
PH3372026  
PH3372027  
PB108M  
PISTON  
PISTON PIN 12 X 37.5MM  
INT RETAINING RING 12MM  
CYLINDER TO CRANKCASE GASKET  
CYLINDER  
GASKET  
VALVE PLANK  
HEX BOLT M3-.5 X 10  
LOCK WASHER 3MM  
INLET VALVE PATCH  
OUTLET VALVE PATCH  
RISE LIMITER  
HEX BOLT M3-.5 X 12  
CYLINDER HEAD GASKET  
CYLINDER HEAD  
CAP SCREW M8-1.25 X 160  
AIR INTAKE FILTER  
90˚ ELBOW 12 MPT X 38-16 UNF  
OIL BREATHER  
PLW09M  
PH3372030  
PH3372031  
PH3372032  
PB109M  
PH3372034  
PH3372035  
PSB98M  
PH3372037  
PH3372038  
PH3372039  
-19-  
H3372 3 HP Air Compressor  
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DESCRIPTION  
O-RING  
PULLEY  
REF  
PART #  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
62  
63  
64  
65  
66  
67  
68  
69  
70  
71  
72  
73  
74  
75  
76  
77  
78  
PH3372040  
PH3372041  
PH3372042  
PLW04M  
GASKET 8MM  
LOCK WASHER 8MM  
HEX BOLT M8-1.25 X 35  
CHECK VALVE  
ELBOW 18 MPT X 116 MPT  
DISCHARGE PIPE 12MM  
COOLER  
COMPRESSION NUT 38 FPT  
FLARE CONNECTOR ID10MM  
EXHAUST PIPE 6MM  
PRESSURE SWITCH  
GASKET  
PB20M  
PH3372045  
PH3372046  
PH3372047  
PH3372048  
PH3372049  
PH3370062  
PH3372051  
PH3372052  
PH3372053  
PH3370057  
PH3370058  
PH3372056  
PH3372057  
PH3372058  
PH3372059  
PH3372060  
PH3372061  
PH3372062  
PW01M  
PLW04M  
PN03M  
PB26M  
PH3372067  
PH3372068  
PK41M  
PH3372070  
PH3372071  
PB08M  
STEM ADAPTER 14 MPT  
FLARE CONNECTOR 38 FPT  
PRESSURE GAUGE  
PRESSURE GAUGE  
SAFETY VALVE  
BALL VALVE 14 NPT  
1
NIPPLE ⁄4 X 18 NPT  
REGULATOR  
TANK 11 GALLON  
FLAT WASHER 8MM  
LOCK WASHER 8MM  
HEX NUT M8-1.25  
HEX BOLT M8-1.25 X 30  
MOTOR  
MOTOR PULLEY  
KEY 8 X 8 X 40  
POWER CORD  
RING TERMINAL #10  
HEX BOLT M6-1 X 20  
FLAT WASHER 6MM  
LOCK WASHER 6MM  
HEX NUT M6-1.0  
BUTTON  
PW03M  
PLW03M  
PN01M  
PH3372076  
PH3372077  
PH3372078  
SUPPORTING PLATE  
BELT GUARD  
-20-  
H3372 3 HP Air Compressor  
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DESCRIPTION  
BELT A1143  
HANDLE  
REF  
PART #  
79  
80  
81  
82  
83  
84  
85  
86  
87  
88  
89  
90  
91  
92  
93  
94  
95  
96  
PH3372079  
PH3372080  
PB21M  
PH3370070  
PB09M  
PH3372084  
PB80M  
PH3372086  
PW08M  
HEX BOLT M8-1.25 X 42  
DRAIN VALVE 14MM  
HEX BOLT M8-1.25 X 20  
CUSHION FOOT  
HEX BOLT M16-2.0 X 55  
PNEUMATIC TIRE 8.5"  
FLAT WASHER 16MM  
HEX NUT M16-2.0  
PN13M  
PH3372089  
PH3372090  
PH3372091  
PH3372092  
PH3372093  
PH3372094  
PH3372095  
PH3372096  
FORK TERMINAL #10  
CAPACITOR 250 MFD 250VAC  
MOTOR FAN  
FAN COVER  
CAPACITOR COVER  
CAPACITOR 40 MFD 400VAC  
GRIZZLY LOGO LABEL  
MACHINE ID LABEL  
-21-  
H3372 3 HP Air Compressor  
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WARRANTY AND RETURNS  
Grizzly Industrial, Inc. warrants every product it sells for a period of 1 year to the original  
purchaser from the date of purchase. This warranty does not apply to defects due directly  
or indirectly to misuse, abuse, negligence, accidents, repairs or alterations or lack of main-  
tenance. This is Grizzly’s sole written warranty and any and all warranties that may be  
implied by law, including any merchantability or fitness, for any particular purpose, are here-  
by limited to the duration of this written warranty. We do not warrant or represent that the  
merchandise complies with the provisions of any law or acts unless the manufacturer so  
warrants. In no event shall Grizzly’s liability under this warranty exceed the purchase price  
paid for the product and any legal actions brought against Grizzly shall be tried in the State  
of Washington, County of Whatcom.  
We shall in no event be liable for death, injuries to persons or property or for incidental, con-  
tingent, special, or consequential damages arising from the use of our products.  
To take advantage of this warranty, contact us by mail or phone and give us all the details.  
We will then issue you a “Return Authorization Number,” which must be clearly posted on  
the outside as well as the inside of the carton. We will not accept any item back without this  
number. Proof of purchase must accompany the merchandise.  
The manufacturers reserve the right to change specifications at any time because they con-  
stantly strive to achieve better quality equipment. We make every effort to ensure that our  
products meet high quality and durability standards and we hope you never need to use this  
warranty.  
Please feel free to write or call us if you have any questions about the machine or the man-  
ual.  
Grizzly Industrial, Inc.  
1203 Lycoming Mall Circle  
Muncy, PA 17756  
Phone: (570) 546-9663  
Fax: (800) 438-5901  
E-Mail:  
Thank you again for your business and continued support. We hope to serve you again  
soon!  
-22-  
H3372 3 HP Air Compressor  
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WARRANTY CARD  
Name__________________________________________________________  
Street__________________________________________________________  
City____________________State________Zip_________  
Phone Number____________E-Mail___________________FAX____________  
Model #_______________Serial#________________Order #______________  
The following information is given on a voluntary basis. It will be used for marketing purposes to help  
us develop better products and services. Of course, all information is strictly confidential.  
9. How many of the machines checked above are  
Grizzly? ____________  
1. How did you learn about us?  
___Advertisement  
___Friend  
___Catalog  
___World Wide Web  
___Other__________________________  
___Card Deck  
10. Which portable/hand held power tools do you own?  
Check all that apply.  
___Belt Sander  
___Biscuit Joiner  
___Circular Saw  
___Detail Sander  
___Drill/Driver  
___Orbital Sander  
___Palm Sander  
___Portable Planer  
___Saber Saw  
___Reciprocating Saw  
___Router  
2. What is your annual household income?  
___$20,000-$29,999  
___$30,000-$39,999  
___$40,000-$49,999  
___$50,000-$59,999  
___$60,000-$69,999  
___$70,000-$79,999  
___$80,000-$89,999  
___$90,000 +  
___Miter Saw  
___Other_________________________________  
3. What is your age group?  
___20-29  
11. What machines/supplies would you like Grizzly  
Industrial to carry?  
___50-59  
___60-69  
___70 +  
___30-39  
___40-49  
________________________________________  
________________________________________  
________________________________________  
________________________________________  
4. How long have you been a woodworker?  
___0 - 2 Years  
___2 - 8 Years  
___8 - 20 Years  
___20+ Years  
12. What new accessories would you like Grizzly  
Industrial to carry?  
5. How would you rank your woodworking skills?  
________________________________________  
________________________________________  
________________________________________  
________________________________________  
___Simple  
___Advanced  
___Intermediate  
___Master Craftsman  
6. What stationary woodworking tools do you own?  
Check all that apply.  
13. What other companies do you purchase your tools  
and supplies from?  
___Air Compressor  
___Band Saw  
___Panel Saw  
___Planer  
_________________________________________  
_________________________________________  
_________________________________________  
___Drill Press  
___Power Feeder  
___Radial Arm Saw  
___Shaper  
___Jointer  
___Lathe  
___Drum Sander  
___Dust Collector  
___Spindle Sander  
___Table Saw  
14. Do you think your purchase represents good value?  
___Yes  
___No  
___Mortiser  
___Wide Belt Sander  
___Horiz.Boring Machine  
___Vacuum Veneer Press  
___Other______________________________  
15. Would you recommend Grizzly to a friend?  
___Yes ___No  
16. Would you allow us to use your name as a refer-  
ence for Grizzly customers in your area? Note: We  
never use names more than three times.  
7. How many of your woodworking machines are  
Grizzly? _____________  
___Yes  
___No  
8. Which benchtop tools do you own? Check all  
that apply.  
17.Comments:________________________________  
_________________________________________  
_________________________________________  
_________________________________________  
___1"x42" Belt Sander ___6" - 8" Grinder  
___5" - 8" Drill Press ___Mini Lathe  
___8" Table Saw  
___Scroll Saw  
___8" - 10" Bandsaw  
___Disc/Belt Sander  
___Spindle/Belt Sander ___Mini Jointer  
___10"-12"Thickness Planer  
___Other______________________________  
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Send a Grizzly Catalog to a friend:  
Name________________________________  
Street________________________________  
City______________State______Zip_______  
FOLD ALONG DOTTED LINE  
Place  
Stamp  
Here  
GRIZZLY INDUSTRIAL, INC.  
P.O. BOX 2069  
BELLINGHAM, WA 98227-2069  
TAPE ALONG EDGES--PLEASE DO NOT NAIL  
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