AIR COMPRESSOR
MODEL G0471
INSTRUCTION MANUAL
COPYRIGHT © JULY, 2005 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.
#EW7400 PRINTED IN CHINA
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Table of Contents
INTRODUCTION.....................................................................................2
Foreword...........................................................................................2
Machine Data....................................................................................2
Contact Info.......................................................................................2
SECTION 1: SAFETY.............................................................................3
Safety Instructions for Pneumatic Tools...........................................3
Additional Safety Instructions for Air Compressors ..........................5
SECTION 2: CIRCUIT REQUIREMENTS ..............................................6
220V Operation.................................................................................6
SECTION 3: SET UP..............................................................................8
Set Up Safety....................................................................................8
Unpacking.........................................................................................8
Items Needed For Set Up.................................................................8
Inventory ...........................................................................................9
Assembly ..........................................................................................9
Placement.......................................................................................11
SECTION 4: OPERATIONS .................................................................12
Operation Safety.............................................................................12
Starting............................................................................................12
Line Pressure Regulation ...............................................................13
Connecting Tools............................................................................14
Storage ...........................................................................................15
SECTION 5: MAINTENANCE...............................................................16
Schedule.........................................................................................16
Draining Tank..................................................................................17
Pressure Safety Valve ....................................................................17
Maintenance Notes.........................................................................18
SECTION 6: SERVICE .........................................................................19
Troubleshooting ..............................................................................19
Changing Oil ...................................................................................21
Check Valve....................................................................................22
Fixing Air Leaks ..............................................................................22
Pressure Switch..............................................................................23
Changing V-Belt..............................................................................24
Service Notes..................................................................................25
G0471 Parts Breakdown.................................................................26
G0471 Parts List.............................................................................27
WARRANTY AND RETURNS ..............................................................28
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INTRODUCTION
Foreword
Contact Info
If you have any comments regarding this
manual, please write to us at the following
address:
We are proud to offer the Model G0471
3 HP Air Compressor. These models are
part of a growing Grizzly family of fine
power tools. When used according to the
guidelines set forth in this manual, you
can expect years of trouble-free, enjoy-
able operation and proof of Grizzly’s com-
mitment to customer satisfaction.
Grizzly Industrial, Inc.
C/O Technical Documentation
P.O. Box 2069
Bellingham, WA 98227-2069
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.
It is our pleasure to provide this manual
with your air compressor. It was written
to encourage safety considerations and
guide you through general operating pro-
cedures and maintenance.
Grizzly Industrial, Inc.
1203 Lycoming Mall Circle
Muncy, PA 17756
Phone: (570) 546-9663
Fax: (800) 438-5901
The specifications, details, and photo-
graphs in this manual represent these
air compressors as supplied when the
manual 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.
E-Mail: [email protected]
Machine Data
Motor ................................3 HP, 220V, 18A
Tank Volume .................................13.2 Gal
Maximum PSI ................................ 125 PSI
CFM at 40 PSI....................................... 6.7
CFM at 90 PSI....................................... 5.7
Shipping Weight .............................150 lbs.
Machine Weight..............................143 lbs.
Read the manual before operation.
Become familiar with this air com-
pressor, its safety instructions, and
its operation before beginning any
work. Serious personal injury may
result if safety or operational informa-
tion is not understood or followed.
-2-
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SECTION 1: SAFETY
For Your Own Safety Read Instruction Manual
Before Operating This Equipment
The purpose of safety symbols is to attract your attention to possible hazard-
ous 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 infor-
NOTICE
mation about proper operation of the equipment.
Safety Instructions for Pneumatic Tools
1. READ THROUGH THE ENTIRE
4. ALWAYS
USE
HEARING
MANUAL
BEFORE STARTING
PROTECTION WHEN OPERATING
MACHINERY. Machinery noise can
cause permanent hearing damage.
MACHINERY. Machinery presents
serious injury hazards to untrained
users.
5. WEAR PROPER APPAREL. DO NOT
wear loose clothing, gloves, neckties,
rings, or jewelry which may get caught
in moving parts. Wear protective hair
covering to contain long hair and
wear non-slip footwear.
2. ALWAYS USE ANSI APPROVED
SAFETY
GLASSES
WHEN
OPERATING MACHINERY. Everyday
eyeglasses only have impact resistant
lenses, they are NOT safety glasses.
3. ALWAYS
WEAR
AN
ANSI
6. NEVER OPERATE MACHINERY
WHEN TIRED, OR UNDER THE
INFLUENCE OF DRUGS OR
ALCOHOL. Be mentally alert at all
times when running machinery.
APPROVED RESPIRATOR WHEN
OPERATING MACHINERY THAT
PRODUCES DUST. Wood dust is a
carcinogen and can cause cancer and
severe respiratory illnesses.
-3-
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7. KEEP CHILDREN AND VISITORS
AWAY. Keep all children and visitors
a safe distance from the work area.
17. REDUCE
THE
RISK
OF
UNINTENTIONAL FIRING. DO NOT
carry tool with hand on trigger and
disconnect from air when not in use.
8. MAKEWORKSHOPCHILDPROOF.
Use padlocks, master switches, and
remove start switch keys. Shut off air
supply before leaving shop.
18. 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.
9. NEVER LEAVE UNATTENDED
TOOL CONNECTED TO AIR. DO
NOT leave before relieving the tool
of air pressure and disconnecting it
from the air hose.
19. DONOTFORCEMACHINERY.Work
at the speed for which the machine
or accessory was designed.
20. DO NOT OVERREACH. Keep prop-
er footing and balance at all times.
10. DO NOT USE IN DANGEROUS
ENVIRONMENTS. DO NOT use in
damp, wet locations, or where flam-
mable or noxious fumes may exist.
21. SECURE WORKPIECE. Use clamps
or a vise to hold the workpiece when
practical. A secured workpiece pro-
tects your hands and frees both
hands to operate the tool.
11. KEEP WORK AREA CLEAN AND
WELL LIT. Clutter and dark shad-
ows may cause accidents.
22. USE SUGGESTED ACCESSORIES.
Refer to the instruction manual for
recommended accessories. The use
of improper accessories may cause
risk of injury.
12. USE A GROUNDED EXTENSION
CORD RATED FOR THE MACHINE
AMPERAGE. Undersized cords
overheat and lose power. Replace
extension cords if they become dam-
aged. DO NOT use extension cords
for 220V machinery.
23. MAINTAIN MACHINERY WITH
CARE. Keep tools lubricated and
clean for best and safest perfor-
mance. Follow instructions for lubri-
cating and changing accessories.
13. ONLY ALLOW TRAINED AND
PROPERLY SUPERVISED PER-
SONNEL TO OPERATE MACHIN-
ERY. Make sure operation instruc-
tions are safe and understood.
24. ALWAYS DISCONNECT FROM
POWER
SOURCE
BEFORE
SERVICING MACHINERY. Make
sure switch is in OFF position before
reconnecting.
14. MAKE SURE GUARDS ARE IN
PLACE AND WORK CORRECTLY
BEFORE USING MACHINERY.
25. DISCONNECTPNEUMATICTOOLS
FROM COMPRESSOR. Always dis-
connect tools before servicing or
changing accessories.
15. CHECK FOR DAMAGED PARTS
BEFORE USING MACHINERY.
Check for binding and alignment of
parts, broken parts, part mounting,
loose bolts, and any other conditions
that may affect machine operation.
Repair or replace damaged parts.
26. BE AWARE THAT CERTAIN
WOODS MAY CAUSE ALLERGIC
REACTIONS IN PEOPLE AND
ANIMALS, ESPECIALLY WHEN
EXPOSED TO FINE DUST. Make
sure you know what type of wood
dust you will be exposed to and
always wear an approved respirator.
16. REMOVE ADJUSTING KEYS AND
WRENCHES. Make a habit of check-
ing for keys and adjusting wrenches
before turning machinery ON.
-4-
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Additional Safety Instructions
for Air Compressors
1. AIR NOZZLE. Never aim an air noz-
zle directly at yourself or others.
Compressed air can break the skin,
or enter the bloodstream through soft
tissue or a cut, and cause a stroke or
death.
6. COMPRESSED AIR USE. Do not
use the compressor for filling breath-
ing or diving tanks. Compressed air
from this compressor cannot be used
for pharmaceutical, food or health
applications.
2. AIR COMPRESSOR STORAGE.
DO NOT store the compressor while
plugged into power. If a leak devel-
ops, the compressor may run con-
tinuously, causing overheating and
possibly a fire.
7. PLASTIC (PVC) PIPE. DO NOT use
plastic pipe for high pressure air
lines. It could shatter, resulting in
serious injury.
8. TANK CORROSION. Drain the tank
after each use to prevent corrosion
and possible tank rupture. Inspect
the tank for unsafe conditions such
as rust, pin holes and cracks. NEVER
weld or drill holes in an air tank.
3. UNATTENDED TOOLS. DO NOT
leave before relieving the tool of air
pressure and disconnecting it from
the air hose.
4. AVOID BURNS. DO NOT touch the
motor or the air supply pipe, they will
become hot during operation.
9. SAFETY VALVE OR PRESSURE
SWITCHES. NEVER adjust safety
valve or pressure switch to allow the
compressor to build higher PSI than
rated. Keep safety valve free from
paint and other accumulations to pro-
vide safety against over-pressure.
5. AIR HOSE. Make sure your air hose
has a PSI rating exceeding the maxi-
mum PSI of your compressor, is in
good condition, and is long enough
to reach your work without stretching.
Make sure the air lines and power
cord do not come in contact with
sharp or abrasive objects.
10. CHECK OIL LEVEL. Use the sight
gauge on the bottom of the crank-
case to make sure the oil level is at
the proper height.
There is danger associated with the
use of air compressors. Accidents are
frequently caused by lack of familiar-
ity or failure to pay attention. Use
this air compressor with respect and
caution to lessen the possibility of
operator injury. If normal safety pre-
cautions are overlooked or ignored,
serious personal injury may occur.
No list of safety guidelines can be
complete. Every environment is dif-
ferent. Always consider safety first,
as it applies to your individual work-
ing conditions. Use this and other
machinery with caution and respect.
Failure to do so could result in seri-
ous personal injury, damage to equip-
ment or poor work results.
-5-
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SECTION 2: CIRCUIT
REQUIREMENTS
Plug/Receptacle Type
Plug Type ............. NEMA 6-20 (Figure 1)
220V Operation
Serious personal injury could occur
if you connect the machine to the
power source before you have com-
pleted the set up process. DO NOT
connect the machine to the power
source until instructed to do so.
Figure 1. Typical NEMA 6-20 plug and
Amperage Draw
The 3 HP motor on the Model G0471 will
draw the following amps:
receptacle.
G0471 Motor Draw......................18 Amps
Circuit Requirements
Only connect your machine to a cir-
cuit that meets the requirements below.
Always check to see if the wires and
circuit breaker in your circuit are capable
of handling the amperage draw from your
machine, as well as any other machines
that could be operating on the same cir-
cuit. If you are unsure, consult a qualified
electrician.
Minimum Circuit Requirement..... 20 Amp
-6-
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Grounding
Extension Cords
In the event of an electrical short, ground-
ing reduces the risk of electric shock. The
grounding wire in the power cord must
be properly connected to the grounding
prong on the plug; likewise, the outlet
must be properly installed and grounded.
All electrical connections must be made
in accordance with local codes and ordi-
nances.
We do not recommend the use of exten-
sion cords on 220V equipment. Instead,
arrange the placement of your equipment
and the installed wiring to eliminate the
need for extension cords.
If you find it absolutely necessary to
use an extension cord at 220V with your
machine, check with a qualified electrician
for the correct sizing, type, and maximum
possible length for your needs.
Electrocution
or
fire could result if
this machine is not
grounded correctly or
if your electrical con-
figuration does not
comply with local and
state codes. Ensure
compliance by check-
ing with
a
qualified
electrician!
-7-
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SECTION 3: SET UP
Set Up Safety
Unpacking
Your air compressor left our warehouse in
a carefully packed crate or box. If you dis-
cover the air compressor is damaged after
you have signed for delivery, please imme-
diately call Customer Service at (570) 546-
9663 for advice.
This machine pres-
ents serious injury
hazards to untrained
users. Read through
this entire manual
to become familiar
with the controls
Save the container and packing materials
for possible inspection by the carrier or its
agent. Otherwise, filing a freight claim can
be difficult.
and
operations
before starting the
machine!
Items Needed
For Set Up
The following items are needed to com-
plete the set up process, but are not
included with your machine:
Description
Qty
Wear safety glasses during the entire
set up process!
•
•
Wrench or Socket 14mm ................... 2
Wrench or Socket 17mm ................... 2
The Model G0471
has
a
shipping
weight of 150 lbs. DO
NOT over-exert your-
self while unpack-
ing or moving your
machine—get assis-
tance.
-8-
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Inventory
Assembly
After you have unpacked the carton you
should find the following.
To assemble the air compressor:
1. Remove all packing materials and any
protective plastic bags, zip tie labels or
tags from the compressor.
Model G0471 Inventory (Figure 2)
A. Compressor.........................................1
B. Wheels ................................................2
C. Handle.................................................1
D. Air Filter...............................................1
2. Insert the axle bolts into the wheels.
3. Slide the axle bolts through the struts
and secure with 10mm lock washers
and M10-1.5 hex nuts (see Figure 3).
Hardware (Not shown)
•
•
•
•
•
•
•
Axle Bolts M10-1.5 x 50......................2
Lock Washers 10mm ..........................2
Hex Nuts M10-1.5...............................2
Hex Bolts M8-1.25 x 45 ......................2
Flat Washers 8mm..............................2
Lock Washers 8mm ............................2
Hex Nuts M8-1.25...............................2
A
Figure 3. Wheels attached to the tank.
4. Attach the air filter to the cylinder head
as shown in Figure 4.
B
D
C
Figure 2. Model G0471 inventory.
In the event that any non proprietary parts
are missing (e.g. a nut or a washer), we
would be glad to replace them, or for the
sake of expediency, replacements can be
obtained at your local hardware store.
Figure 4. Air filter attached to
cylinder head.
-9-
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5. Slide the handle into the sockets on the
tank and secure with M8-1.25 x 45 hex
bolts, flat washers, lock washers, and
hex nuts as shown in Figure 5.
6. Remove the oil breather (inset in Figure
6) on top of the crankcase and add
compressor oil, or ISO 100/SAE 30W
non-detergent oil, to the crankcase.
The oil level should be in the center of
the sight glass as shown in Figure 6.
Oil Breather
Figure 5. Air compressor handle.
Figure 6. Proper oil level.
NOTICE
Never run this compressor without
a full oil reservoir. The oil provides
lubrication to the cylinder rings,
which deliver the compressed air.
Severe damage to the internal mov-
ing parts can occur if there is not
adequate oil flow. Check the oil level
frequently, and change the oil every
3 months.
NOTICE
The oil breather releases excess
pressure from the crankcase.
Clogged holes in the oil breather
can lead to damaged oil seals, gas-
kets, and may cause the compres-
sor to seize.
-10-
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Placement
When determining where to set up the
air compressor in the shop or when tak-
ing the air compressor to a job site,
an important consideration is access to
an adequate and properly fused power
supply. Refer to SECTION 2: CIRCUIT
REQUIREMENTS for the needs of your
particular compressor.
Place the compressor on a solid and
level surface. Make sure that the hoses
attached to your pneumatic device are
unrestricted in movement and not subject
to being run over by vehicles or punctured
by sharp objects.
Do not place the compressor next to
flammable liquids or gas! The com-
pressor motor and air supply pipe
can reach high temperatures and
cause the flammable gas to ignite.
Keep work area clear from flammable
gas when using the compressor.
Since air compressors are often used for
a sustained period of time, sometimes in
restricted areas, wear ear protection to
avoid long term exposure to the noise.
Make sure the compressor is operating
in an environment where there are no
explosive, flammable, or caustic fumes or
gases. A clear and well ventilated area is
best for its safe operation.
Do not place the compressor in a
paint spraying or gluing booth. The
electric motor on the compressor
could cause the fumes to explode.
-11-
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SECTION 4: OPERATIONS
Operation Safety
Starting
To start the air compressor:
1. Place the compressor on a solid, level
surface with access to a properly
fused power supply. DO NOT oper-
ate the compressor in an environment
where there are explosive, flammable,
or caustic fumes or gases.
2. Make sure the compressor switch is
in the OFF position (lever with red cap
shown in Figure 7) before connecting
to the power supply.
Long term exposure to this machine
may cause hearing loss. To protect
your hearing, always wear ANSI
approved ear protection when operat-
ing this air compressor.
AUTO/OFF
Lever
Figure 7. AUTO/OFF lever.
3. Double check the oil level to make sure
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).
the oil reservoir is full.
4. Connect the compressor to the power
supply.
5. Leave the drain valve open, flip the
switch to the AUTO position and allow
the compressor to run for 5 minutes
before completing Step 6.
Note: Whenever the compressor has
not been run for more than a few days,
allow it to run with the drain valve
open for 5 minutes to fully lubricate the
motor.
-12-
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6. Close the drain valve (Figure 8) to
Line Pressure
Regulation
allow the tank to build up pressure.
The air tool that you attach to the air com-
pressor should have a preferred PSI oper-
ating level. Set the pressure to be deliv-
ered according to the pressure required
by the tool.
To control the air supply to your tool:
Figure 8. Drain valve.
1. Adjust the air control knob, shown in
Figure 10, to set the PSI that will be
delivered to your tool. Turn the knob
clockwise to increase the pressure or
counterclockwise to decrease the pres-
sure.
7. Check the tank pressure gauge (Figure
9) to see that the tank pressure climbs
to approximately 110-120 PSI (around
8 BAR) and turns OFF.
Note: If the compressor does not turn
OFF before reaching 120 PSI, flip
the AUTO/OFF switch to OFF before
the pressure reaches 125 PSI. See
Pressure Switch on Page 23 to adjust
the automatic shut-off.
Air Control
Knob
Lock Ring
Line
Pressure
Figure 10. Tool air control knob.
2. Rotate the lock ring shown in Figure
10 against the bottom of the air control
knob to prevent changes in the air pres-
sure.
Tank
Pressure
Figure 9. G0471 Pressure gauges.
-13-
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3. Connect an air line with a 1⁄4" NPT plug
to the quick-connect coupler on the air
compressor shown in Figure 11.
Connecting Tools
Note: There are many styles of 1⁄4" NPT
quick connect couplers. If the quick
connect coupler included with the com-
pressor does not fit the plug on your air
hose, purchase a matched set at your
local hardware store.
When choosing air tools, consider the
amount of air used (cubic feet per min-
ute or CFM) by the tool. Nailers and
staple guns have a low CFM requirement
because they use air in short bursts. A
paint sprayer or a pneumatic grinder uses
a more continuous stream of air requir-
ing a high CFM. Make sure the air tool
you plan to connect does not exceed the
CFM output of your compressor. Most air
tools will have an air requirement stated
in terms of a specific CFM at a specific
pressure.
Air tools being operated with insufficient
air volume will not perform their function
satisfactorily and they will cause the air
compressor to run continually. When an
air compressor runs continually it may
overheat, causing damage to the com-
pressor and the possibility of a fire. This
compressor is fitted with thermal protec-
tion inside the motor. If the compressor
overheats, the motor will automatically
turn OFF until it cools down.
Figure 11. Quick connect coupler.
These air compressors are specifi-
cally designed for air tool operation.
DO NOT modify, or use this machine
for any other purpose. Modifications
or improper use of this tool will void
the warranty. If you are confused
about any aspect of this machine,
DO NOT use it until your questions
have been answered. Serious per-
sonal injury may occur.
To connect air tools to your air com-
pressor:
1. Follow the compressor Starting instruc-
tions on Page 12.
2. Connect the tool to a good quality air
hose that is long enough to reach from
the point of use to the compressor.
Note: Be aware of the placement of
the hose to prevent damage. Make
certain the air hose is not located
where it can become constricted, cut
by a sharp object, or run over. Running
over a hose with a vehicle may not
cause an immediate leak, but it will
shorten the life of the hose.
-14-
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Storage
Failure to unplug the air compres-
sor before storage may result in the
compressor running continuously,
causing overheating, damage to the
compressor, and possibly a fire.
When storing your air compressor, fol-
low these guidelines:
1. Turn the compressor switch lever to
OFF.
2. Unplug the compressor.
3. Turn the regulator counterclockwise to
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.
set the line pressure to zero.
4. Run the air tool to relieve the air pres-
sure in the hose, then remove the air
hose and the tool.
5. Drain water from the tank as instructed
in Draining Tank on Page 17. Leave
the valve open until the next usage.
Note: Draining the air from the tank will
be extremely loud. Wear ear protection
when draining the tank.
6. Store the air compressor in its normal
operating position in a cool protected
area.
Always disconnect the 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!
-15-
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SECTION 5: MAINTENANCE
If the compressor is used on a daily basis,
perform the following checks each week.
Schedule
Weekly
1. Blow dirt and dust off of the air filter
(Figure 12), then re-install.
Operating this equipment has the
potential to cause eye injury and
hearing loss. Always wear eye and
ear protection when operating an air
compressor. Be certain the safety
protection you wear meets the appro-
Figure 12. Air filter foam element.
priate standards of the American
National Standards Institute (ANSI).
2. Check for loose bolts or fittings.
3. Clean off all dirt and dust from the cylin-
der head, motor, fan, air lines, exhaust
pipe, couplers and frame. Dirt can lead
to overheating.
For optimum performance from your
machine, follow this maintenance sched-
ule and refer to any specific instructions
given in this section.
4. Check air lines and connectors to make
sure they are in good condition.
Daily
5. Pull the safety drain valve to make sure
it is working properly (see Draining
Tank on Page 17).
1. Check the oil level! Use the sight glass
on the crankcase to make sure the oil
reservoir is at the correct level.
2. Check for worn or damaged cords and
plugs.
3. Check for any other condition that
could hamper the safe operation of this
air compressor.
The air compressor will turn ON
automatically when it is set on AUTO.
When performing maintenance make
sure the AUTO/OFF lever is in the
OFF position, the compressor is
unplugged, and the air pressure has
been bled out of the tank.
4. When finished using the air compres-
sor, drain the condensation from the
tank as instructed in Draining Tank
on Page 17, and leave the drain valve
open until the next use.
-16-
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Monthly
Pressure Safety
Valve
After the first 50 working hours or 30 days,
perform the following maintenance:
1. Change the oil in the air compressor
pump as described in Changing Oil on
Page 21.
The pressure safety valve prevents dam-
age to the tank by releasing pressure when
the tank reaches maximum capacity.
Quarterly
After every 300 working hours or 3 months,
perform the following maintenance:
To check the pressure safety valve:
1. Locate the pressure safety valve shown
in Figure 14.
1. Change the oil in the air compressor
pump as described in Changing Oil on
Page 21.
Pressure
Safety Valve
2. Check for air leaks and correct as
needed.
Draining Tank
Some water may accumulate in the tank
depending on usage and humidity. Drain
water from the tank daily to increase the
lifespan of the compressor and air tools.
Figure 14. Pressure safety valve.
To drain the tank:
Releasing the safety valve will be
extremely loud. Protect your hearing
with ANSI approved ear protection.
1. Leave the tank pressurized and open
the drain valve, shown in Figure 13, to
drain the water out of the tank.
2. Clean any dirt or dust from the pres-
Note: Draining the air from the tank will
be extremely loud. Wear ear protection
when draining the tank.
sure safety valve.
3. Pull the metal ring on top of the safety
valve to ensure the valve will release
air. The pressure safety valve must be
replaced if it cannot be pulled, or if it
leaks after releasing pressure.
Note: The safety valve is preset to
release air if the tank exceeds its maxi-
mum pressure. DO NOT try to adjust
the safety valve pressure setting!
Figure 13. Tank drain valve.
-17-
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Maintenance Notes
This page is for tracking oil changes and other maintenance proce-
dures to ensure that they are performed at the scheduled intervals.
Date
-18-
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SECTION 6: SERVICE
This section is provided for your convenience—it is not a substitute for the Grizzly Service
Department. If you need help troubleshooting, replacing parts, or you are unsure of how
to perform the procedures in this section, then feel free to call our Technical Support at
(570) 546-9663.
Troubleshooting
Symptom
Possible Cause
Possible Solution
Motor will not start.
1. Tank already pressurized. 1. Motor will not start if tank
is fully pressurized.
2. Thermal overload switch
has tripped.
2. Wait for motor to cool.
3. Low voltage.
3. Check power line for
proper voltage.
4. Short circuit in motor or
cord, or loose connec-
tions.
4. Inspect all connections on
motor for loose or shorted
terminals or worn insula-
tion.
5. Incorrect fuses or circuit
breakers in power line.
5. Install correct fuses or cir-
cuit breakers.
6. Pressure switch is bad.
6. Replace the pressure
switch.
Motor fails to develop
full power (output of
motor decreases rapidly
with decrease in volt-
age at motor terminals).
1. Power line overloaded
with lights, appliances,
and other motors.
2. Undersized wires or cir-
cuits too long.
1. Reduce load on power
line.
2. Increase wire sizes or
reduce length of the cir-
cuit.
Motor overheats and
thermal overload turns
motor OFF.
1. Cooling fins dirty.
1. Clean cylinder fins and
motor area.
2. Air filter clogged.
3. Compressor is running
too long without a break.
2. Inspect and clean air filter.
3. Do not use air tools with
CFM needs that exceed
the compressor CFM rat-
ing.
4. Air circulation through the 4. Clean out motor to pro-
motor restricted.
vide normal air circula-
tion.
-19-
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Symptom
Possible Cause
Possible Solution
Loud repetitious noise
coming from air com-
pressor.
1. Pulley setscrews or keys
are missing or loose.
1. Inspect keys and set-
screws. Replace or
tighten if necessary.
2. Adjust fan cover mounting
position, tighten fan, or
shim fan cover.
2. Motor fan is hitting the
cover.
Low pressure at the
tool.
1. Pressure regulator.
1. Adjust pressure regulator,
if no improvement, inspect
regulator for leaks or
replace.
2. Air leaks in hoses.
2. Check air hoses and all
connections for leaks (see
Page 22).
3. Pressure gauge bad.
3. Replace the pressure
gauge.
4. Pressure switch turns the 4. Adjust the pressure switch
motor OFF too soon. (see Page 23)
Low pressure at the
tanks, or tank pressure
drops after compressor
is turned OFF.
1. Air leaks in tanks or deliv- 1. Check air tanks, pipes and
ery pipes.
all connections for leaks
(see Page 22).
2. Drain valve open.
3. Air filter clogged.
4. Leaking check valve.
2. Close drain valve.
3. Inspect and clean air filter.
4. Repair the check valve
(see Page 22).
5. Pressure relief valve
releasing below 120 PSI.
6. Gaskets leaking.
5. Replace pressure relief
valve.
6. Check gaskets on cylinder
head assembly, repair or
replace as needed.
7. Worn rings.
7. Inspect and replace pump
piston rings.
8. Pressure switch turns the 8. Adjust the pressure switch
motor OFF too soon.
(see Page 23).
Compressor knocking.
1. Improper oil level.
1. Check oil level and add oil
(see Page 10).
2. Air filter clogged.
3. Piston assembly loose.
2. Inspect and clean air filter.
3. Inspect and repair piston
and connecting rod.
Pressure relief valve
stays open and motor
won’t stop running.
1. Pressure switch adjusted
too high.
2. Faulty pressure switch,
unit is trying to overpres-
sure the tank.
1. Adjust the pressure switch
(see Page 23)
2. Turn compressor OFF,
unplug from power sup-
ply, and empty tank.
DO NOT USE until switch
is replaced.
3. Faulty pressure relief
valve.
3. Relief valve is reliev-
ing pressure too early.
Replace pressure relief
valve.
-20-
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Symptom
Possible Cause
Possible Solution
Air leaks from pressure
switch.
1. Faulty check valve.
1. Repair the check valve
(see Page 22).
2. Faulty pressure switch.
2. Replace pressure switch.
Air is dirty or has exces- 1. Tank is not drained.
sive moisture.
1. Open drain valve and
make certain all the water
is drained out.
2. Delivery pipes are dirty.
2. Remove delivery pipes,
clean out and replace.
5. Replace the oil drain cap screw and
remove the oil breather fill plug shown
in Figure 16.
Changing Oil
Change the oil in the air compressor pump
after the initial 50 hours, or 30 days of use;
and every 300 hours, or 3 months after the
first oil change. Use compressor oil or ISO
100/SAE 30W, non-detergent type oil.
Oil Breather
Fill Plug
To change the oil:
1. Unplug the air compressor and drain
all the air from the tank.
Figure 16. Oil breather fill plug.
2. Place a container on the floor to catch
the oil, then tip the compressor so the
cap screw shown in Figure 15 is over
the container.
6. Fill the crank case with oil until the oil
level is in the center of the sight glass,
then replace the oil breather fill plug.
Oil Drain
Cap Screw
Figure 15. Oil drain cap screw.
3. Use a hex wrench to remove the oil
drain cap screw shown in Figure 15.
4. Drain all of the oil from the crank case
then tip the compressor upright.
-21-
Model G0471 3 HP Air Compressor
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Check Valve
Fixing Air Leaks
The diaphragm and O-ring in the check
valve can become damaged, twisted, or
dirty and cause the check valve or pres-
sure switch to leak air.
Air leaks will cause low air output and
increase the time the compressor must
run.
To find air leaks:
To fix the check valve:
1. Turn the compressor OFF when the
tank is fully pressurized and unplug the
compressor.
1. Unplug the air compressor and drain
all the air from the tank.
2. Remove the cap from the check valve
shown in Figure 17.
2. Listen for the sound of air to find fittings
that may be leaking.
3. Spray the suspected air leak with a
soap and water solution. If you see air
bubbles, you have found your leak.
To fix air leaking around fitting threads:
1. Unplug the air compressor and drain
all the air from the tank.
Cap
2. Unscrew the fitting that is leaking. Clean
and wrap teflon tape and/or spread pipe
dope on the threads.
Figure 17. Check valve.
3. Inspect the O-ring and diaphragm
(Figure 18) for damage and dirt.
3. Re-install the fitting to the compressor.
To fix air leaking through a valve:
Diaphragm
O-ring
1. Unplug the air compressor and drain
all the air from the tank.
2. Remove the valve, clean it thoroughly,
then re-install with teflon tape and/or
pipe dope.
3. If the valve continues to leak, replace it
with a new valve.
Figure 18. Check valve diaphragm and
spring.
4. Clean dirt off of the diaphragm and O-
ring and replace any damaged parts.
5. Re-assemble the check valve. Make
sure the diaphragm presses squarely
against the air supply tube opening.
-22-
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5. Turn the black plastic pressure adjust-
ment screw (Figure 20) a half turn
clockwise to increase the maximum
tank pressure and a half turn counter-
clockwise to decrease the pressure.
Pressure Switch
The pressure switch has been factory set
for the highest PSI that is safe for this
compressor.
Maximum
Minimum Tank
Pressure
Tank Pressure
The pressure switch ensures the com-
pressor will shut OFF when the air tank
reaches maximum PSI.
NOTICE
This air compressor has been factory
set to turn ON and OFF at the proper
PSI range. Only attempt to adjust the
pressure regulator if your air com-
pressor does not reach, or pressur-
izes beyond the proper PSI level.
Figure 20. Pressure adjustment screws.
6. Adjust the metal pressure adjustment
screw to change how low the pressure
can drop before the motor turns ON.
To adjust the pressure switch:
7. Connect the compressor to the power
supply and start the compressor. If
the compressor does not automati-
cally turn OFF at 120 PSI, flip the ON/
OFF switch to OFF before the pres-
sure reaches 125 PSI.
1. Unplug the air compressor from the
power supply.
2. Make sure the compressor switch is in
the OFF position.
8. If the PSI level still needs adjustment,
repeat Steps 1–7.
3. Drain the pressure from the tank.
4. Remove the black AUTO/OFF switch
cover (Figure 19) by removing the
screw in the recess of the cover. Pull
the black cover up and set it aside.
9. Replace the cover when the proper
adjustments have been completed.
Figure 19. Pressure switch cover.
-23-
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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 to tension the belt
and secure the mounting bolts loos-
ened in step 2.
1. Remove the belt guard. The guard is
attached to the compressor frame by
the mounting bolts shown in Figure
21.
Note: A properly tensioned V-belt will
have about a ½" deflection as shown in
Figure 23.
½" of Deflection
Figure 21. Belt guard mounting bolts.
Figure 23. V-belt deflection.
6. Replace belt guard.
2. Loosen the four nuts (one side shown
in Figure 22) that secure the motor to
the compressor frame so the motor can
slide towards crankcase, relieving the
tension on the V-belt.
Make sure the V-belt is properly
tensioned. 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 22. Motor mounting bolts.
-24-
Model G0471 3 HP Air Compressor
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Service Notes
-25-
Model G0471 3 HP Air Compressor
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G0471 Parts Breakdown
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-26-
Model G0471 3 HP Air Compressor
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G0471 Parts List
REF PART #
1
2
3
DESCRIPTION
P0471001 CRANKSHAFT
P6205 BALL BEARING 6205
P0471003 CONNECTING ROD
P0471004 POSITION PIN
CAP SCREW M8-1.25 X 40
P0471006 LOWER CRANKCASE GASKET
P0471007 O-RING
P0471008 CRANKCASE
P0471009 FRONT COVER GASKET
P0471010 FRONT COVER
P0471011 OIL SEAL
REF PART #
DESCRIPTION
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
P0471053 SPECIAL WASHER
P0471054 CONNECT
P0471055 COMPRESSION NUT
P0471056 PRESSURE GAUGE
P0471057 PRESSURE GAUGE
P0471058 SAFETY VALVE
P0471059 AIR COCK
P0471060 CONNECTOR
P0471061 REGULATOR
P0471062 TANK 13.2 GAL
4
5
PSB12M
6
7
8
9
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
40
41
42
43
44
45
46
47
48
49
50
51
52
PW01M
PLW04M
PN03M
PB26M
FLAT WASHER 8MM
LOCK WASHER 8MM
HEX NUT M8-1.25
P0471012 BACK COVER
PLW03M
PB08M
LOCK WASHER 6MM
HEX BOLT M6-1 X 20
P0471015 OIL SIGHT SEAL
P0471016 OIL SIGHT
HEX BOLT M8-1.25 X 30
P0471067 MOTOR
67-1 P0471067-1 RESET BUTTON
PSB52M
CAP SCREW M8-1.25 X 10
67-2 PC040C
67-3 PC200A
67-4 P0471067-4 STRAIN RELIEF
67-5 P0471067-5 CAPACITOR BOX COVER
67-6 P0471067-6 CAPACITOR BOX
67-7 P0471094 FAN
CAPACITOR 40 MFD 450 VAC
CAPACITOR 200 MFD 250 VAC
P0471018 COMPRESSION RING
P0471019 COMPRESSION RING
P0471020 OIL RING
P0471021 PISTON
P0471022 PISTON PIN
PR05M
EXT RETAINING RING 15MM
67-8 P0471095 FAN COVER
P0471024 LOWER GASKET
P0471025 CYLINDER
P0471026 UPPER GASKET
P0471027 VALVE PLATE
PHLP HD SCR M3-.5 X 10
LOCK WASHER 3MM
P0471030 INLET VALVE
P0471031 OUTLET VALVE
P0471032 LIMITATION
68
69
70
71
72
73
74
75
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
96
97
98
P0471068 PULLEY
PK07M
KEY 6 X 6 X 20
P0471070 MOTOR POWER CORD
P0471071 POWER CORD
PS55M
PLW09M
PB08M
PW03M
PLW03M
PN01M
HEX BOLT M6-1 X 20
FLAT WASHER 6MM
LOCK WASHER 6MM
HEX NUT M6-1
P0471077 SUPPORT BRACKET
P0471078 SAFETY GUARD
P0471079 V-BELT A-34 4L340
P0471080 HANDLE
PS50M
PHLP HD SCR M3-.5 X 12
P0471034 HEAD GASKET
P0471035 CYLINDER HEAD
PSB45M
CAP SCREW M8-1.25 X 45
PB118M
HEX BOLT M8-1.25 X 45
P0471037 AIR FILTER ASSEMBLY
P0471038 EXHAUST ELBOW
P0471039 OIL FILL CAP
P0471040 O-RING
P0471082 DRAIN VALVE
PB09M
HEX BOLT M8-1.25 X 20
P0471084 RUBBER FOOT
P0471085 AXLE BOLT M10-1.5 X 50
P0471086 PNEUMATIC TIRE 8"
P0471041 FLYWHEEL
PW01M
PLW04M
PB20M
FLAT WASHER 8MM
LOCK WASHER 8MM
HEX BOLT M8-1.25 X 35
PLW06M
PN02M
LOCK WASHER 10MM
HEX NUT M10-1.5
P0471089 CABLE CONNECTOR (U)
P0471090 CABLE CONNECTOR (O)
P0471091 CRANKCASE BOTTOM PLATE
P0471045 CHECK VALVE
P0471046 ELBOW
P0471047 OUTLET TUBE
P0471048 FIN TUBING
P0471049 COMPRESSION NUT
P0471050 COMPRESSION NUT
P0471051 RELIEF TUBE
P0471052 PRESSURE SWITCH
PW05M
PS07M
FLAT WASHER 4MM
PHLP HD SCR M4-.7 X 8
P0471096 BACK COVER GASKET
PB09M HEX BOLT M8-1.25 X 20
PHTEK6M TAP SCREW M4 X 16
-27-
Model G0471 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
maintenance. 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
hereby 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,
contingent, 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
constantly 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
manual.
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!
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WARRANTY CARD
Name_________________________________________________________________
Street_________________________________________________________________
City _______________________ State_________________________ Zip _________
Phone #____________________ Email ________________________ Invoice #_____
Model # ____________________ Order #_______________________ Serial #______
The following information is given on a voluntary basis. It will be used for marketing purposes to
help us develop better products and services. All information is strictly confidential.
1. How did you learn about us?
____Advertisement
____Friend
____Catalog
____Card Deck
____Website
Other:________________________
2. Which of the following magazines do you subscribe to?
____ Cabinet Maker
____ Family Handyman
____ Hand Loader
____ Handy
____ Home Shop Machinist ____ Precision Shooter
____ Journal of Light Cont. ____ Projects in Metal
____ Popular Mechanics
____ Popular Science
____ Popular Woodworking ____ Wooden Boat
____ Practical Homeowner ____ Woodshop News
____ Today’s Homeowner
____ Wood
____ Woodsmith
____ Woodwork
____ Live Steam
____ Model Airplane News ____ Rifle
____ Modeltec
____ Old House Journal
____ RC Modeler
____ Woodworker West
____ Woodworker’s Journal
____ Other:
____ Shop Notes
____ Shotgun News
3. What is your annual household income?
____$20,000-$29,000
____$30,000-$39,000
____$40,000-$49,000
____$70,000+
____$50,000-$59,000
____$60,000-$69,000
4. What is your age group?
____20-29
____30-39
____60-69
____40-49
____70+
____50-59
5. How long have you been a woodworker/metalworker?
____0-2 Years ____2-8 Years ____8-20 Years
____20+ Years
6. How many of your machines or tools are Grizzly?
____0-2 ____3-5 ____6-9
____10+
____No
____No
7. Do you think your machine represents a good value? ____Yes
8. Would you recommend Grizzly Industrial to a friend? ____Yes
9. Would you allow us to use your name as a reference for our customers in your area?
Note: We never use names more than 3 times. ____Yes ____No
10. Comments:_________________________________________________________
______________________________________________________________________
______________________________________________________________________
______________________________________________________________________
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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 STAPLE
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