AIR COMPRESSOR
MODEL G0471
INSTRUCTION MANUAL
WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
COPYRIGHT © JULY, 2005 BY GRIZZLY INDUSTRIAL, INC.
#EW7400 PRINTED IN CHINA
Table of Contents
INTRODUCTION .....................................................................................2
Foreword ...........................................................................................2
Machine Data ....................................................................................
Contact Info .......................................................................................
SECTION 1: SAFETY ............................................................................. 3
Safety Instructions for
Additional Safety Instructions for Air Compressor
SECTION 2: CIRCUIT REQUIREMENTS ..............................................6
220V Operation ................................................................................. 6
SECTION 3: SET UP ..............................................................................8
Set Up Safety ....................................................................................
Unpacking .........................................................................................8
Items Needed For Set Up .................................................................8
Inventory ...........................................................................................9
Assembly ..........................................................................................9
Placement .......................................................................................11
SECTION 4: OPERATIONS .................................................................12
Operation Safety .............................................................................
Starting ............................................................................................12
Line Pressure Regulation ...............................................................13
Connecting Tools ............................................................................
Storage ...........................................................................................15
SECTION 5: MAINTENANCE ...............................................................16
Schedule .........................................................................................16
Draining Tank ..................................................................................
Pressure Safety Valve ....................................................................
Maintenance Notes .........................................................................
SECTION 6: SERVICE .........................................................................19
Troubleshooting ..............................................................................19
Changing Oil ...................................................................................
Check Valve .................................................................................... 22
Fixing Air Leaks ..............................................................................
Pressure Switch ..............................................................................23
Changing V-Belt .............................................................................. 24
Service Notes ..................................................................................25
G0471 Parts Breakdown .................................................................
G0471 Parts
WARRANTY AND RETURNS ..............................................................28
List .............................................................................27
Pneumatic Tools ........................................... 3
s .......................... 5
12
14
17
17
18
21
22
26
2
2
8
INTRODUCTION
Foreword Contact Info
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 commitment to customer satisfaction.
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 procedures and maintenance.
The specifications, details, and photographs in this manual represent these
air compressors 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.
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.
If you have any comments regarding this
manual, please write to us at the following
address:
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.
Grizzly Industrial, Inc.
1203 Lycoming Mall Circle
Muncy, PA 17756
Phone: (570) 546-9663
Fax: (800) 438-5901
E-Mail: techsupport@grizzly.com
Web Site: http://www.grizzly.com
Read the manual before operation.
Become familiar with this air compressor, 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.
-2-
Model G0471 3 HP Air Compressor
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 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.
NOTICE
This symbol is used to alert the user to useful information about proper operation of the equipment.
Safety Instructions for Pneumatic Tools
1. READ THROUGH THE ENTIRE
MANUAL BEFORE STARTING
MACHINERY. Machinery presents
serious injury hazards to untrained
users.
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
APPROVED RESPIRATOR WHEN
OPERATING MACHINERY THAT
PRODUCES DUST. Wood dust is a
carcinogen and can cause cancer and
severe respiratory illnesses.
Model G0471 3 HP Air Compressor
4. ALWAY S USE HEAR ING
PROTECTION WHEN OPERATING
MACHINERY. Machinery noise can
cause permanent hearing damage.
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.
6. NEVER OPERATE MACHINERY
WHEN TIRED, OR UNDER THE
INFLUENCE OF DRUGS OR
ALCOHOL. Be mentally alert at all
times when running machinery.
-3-
7. KEEP CHILDREN AND VISITORS
AWAY. Keep all children and visitors
a safe distance from the work area.
8. MAKE WORKSHOP CHILD PROOF.
Use padlocks, master switches, and
remove start switch keys. Shut off air
supply before leaving shop.
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.
10. DO NOT USE IN DANGEROUS
ENVIRONMENTS. DO NOT use in
damp, wet locations, or where flammable or noxious fumes may exist.
11. KEEP WORK AREA CLEAN AND
WELL LIT. Clutter and dark shad-
ows may cause accidents.
12. USE A GROUNDED EXTENSION
CORD RATED FOR THE MACHINE
AMPERAGE. Undersized cords
overheat and lose power. Replace
extension cords if they become damaged. DO NOT use extension cords
for 220V machinery.
13. ONLY ALLOW TRAINED AND
PROPERLY SUPERVISED PERSONNEL TO OPERATE MACHINERY. Make sure operation instruc-
tions are safe and understood.
14. MAKE SURE GUARDS ARE IN
PLACE AND WORK CORRECTLY
BEFORE USING MACHINERY.
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.
16. REMOVE ADJUSTING KEYS AND
WRENCHES. Make a habit of check-
ing for keys and adjusting wrenches
before turning machinery ON.
17. REDUCE THE RISK OF
UNINTENTIONAL FIRING. DO NOT
carry tool with hand on trigger and
disconnect from air when not in use.
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.
19. DO NOT FORCE MACHINERY. Work
at the speed for which the machine
or accessory was designed.
20. DO NOT OVERREACH. Keep proper footing and balance at all times.
21. SECURE WORKPIECE. Use clamps
or a vise to hold the workpiece when
practical. A secured workpiece protects your hands and frees both
hands to operate the tool.
22. USE SUGGESTED ACCESSORIES.
Refer to the instruction manual for
recommended accessories. The use
of improper accessories may cause
risk of injury.
23. MAINTAIN MACHINERY WITH
CARE. Keep tools lubricated and
clean for best and safest performance. Follow instructions for lubricating and changing accessories.
24. ALWAYS DISCONNECT FROM
POWER SOURC E BEFORE
SERVICING MACHINERY. Make
sure switch is in OFF position before
reconnecting.
25. DISCONNECT PNEUMATIC TOOLS
FROM COMPRESSOR. Always dis-
connect tools before servicing or
changing accessories.
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.
-4-
Model G0471 3 HP Air Compressor
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.
2. AIR COMPRESSOR STORAGE.
DO NOT store the compressor while
plugged into power. If a leak develops, the compressor may run continuously, causing overheating and
possibly a fire.
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.
5. AIR HOSE. Make sure your air hose
has a PSI rating exceeding the maximum 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.
6. COMPRESSED AIR USE. Do not
use the compressor for filling breathing or diving tanks. Compressed air
from this compressor cannot be used
for pharmaceutical, food or health
applications.
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.
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 provide safety against over-pressure.
10. CHECK OIL LEVEL. Use the sight
gauge on the bottom of the crankcase 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 familiarity or failure to pay attention. Use
this air compressor with respect and
caution to lessen the possibility of
operator injury. If normal safety precautions are overlooked or ignored,
serious personal injury may occur.
Model G0471 3 HP Air Compressor
No list of safety guidelines can be
complete. Every environment is different. Always consider safety first,
as it applies to your individual working conditions. Use this and other
machinery with caution and respect.
Failure to do so could result in serious personal injury, damage to equipment or poor work results.
-5-
SECTION 2: CIRCUIT
REQUIREMENTS
220V Operation
Serious personal injury could occur
if you connect the machine to the
power source before you have completed the set up process. DO NOT
connect the machine to the power
source until instructed to do so.
Amperage Draw
The 3 HP motor on the Model G0471 will
draw the following amps:
G0471 Motor Draw ......................18 Amps
Circuit Requirements
Only connect your machine to a circuit 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 circuit. If you are unsure, consult a qualified
electrician.
Plug/Receptacle Type
Plug Type ............. NEMA 6-20 (Figure 1)
Figure 1. Typical NEMA 6-20 plug and
receptacle.
Minimum Circuit Requirement ..... 20 Amp
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Model G0471 3 HP Air Compressor
Grounding
In the event of an electrical short, grounding 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 ordinances.
El e ctro c utio n o r
fire could result if
this machine is not
grounded correctly or
if your electrical configuration does not
comply with local and
state codes. Ensure
compliance by checking with a qualified
electrician!
Extension Cords
We do not recommend the use of extension 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.
Model G0471 3 HP Air Compressor
-7-
SECTION 3: SET UP
Set Up Safety
This machine presents serious injury
hazards to untrained
users. Read through
this entire manual
to become familiar
with the contro ls
an d op e rati ons
before starting the
machine !
Wear safety glasses during the entire
set up process!
Unpacking
Your air compressor left our warehouse in
a carefully packed crate or box. If you discover the air compressor is damaged after
you have signed for delivery, please imme-
diately call Customer Service at (570) 5469663 for advice.
Save the container and packing materials
for possible inspection by the carrier or its
agent. Otherwise, filing a freight claim can
be difficult.
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
• Wrench or Socket 14mm ................... 2
• Wrench or Socket 17mm ................... 2
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-8-
The Model G0471
has a shipping
weight of 150 lbs. DO
NOT over-exert yourself while unpacking or moving your
machine —get assistance.
Model G0471 3 HP Air Compressor
Inventory
Assembly
After you have unpacked the carton you
should find the following.
Model G0471 Inventory (Figure 2 )
A. Compressor. ........................................1
B. Wheels ................................................2
C. Handle ................................................. 1
D. Air Filter ............................................... 1
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
C
D
Figure 2. Model G0471 inventory.
B
To assemble the air compressor:
1. Remove all packing materials and any
protective plastic bags, zip tie labels or
tags from the compressor.
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).
Figure 3. Wheels attached to the tank.
4. Attach the air filter to the cylinder head
as shown in Figure 4.
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.
Model G0471 3 HP Air Compressor
Figure 4. Air filter attached to
cylinder head.
-9-
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.
Figure 5. Air compressor handle.
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 moving parts can occur if there is not
adequate oil flow. Check the oil level
frequently, and change the oil every
3 months.
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 6. Proper oil level.
NOTICE
The oil breather releases excess
pressure from the crankcase.
Clogged holes in the oil breather
can lead to damaged oil seals, gaskets, and may cause the compressor to seize.
-10-
Model G0471 3 HP Air Compressor
Placement
When determining where to set up the
air compressor in the shop or when taking 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.
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 next to
flammable liquids or gas! The compressor 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.
Do not place the compressor in a
paint spraying or gluing booth. The
electric motor on the compressor
could cause the fumes to explode.
Model G0471 3 HP Air Compressor
-11-
SECTION 4: OPERATIONS
Operation Safety
Long term exposure to this machine
may cause hearing loss. To protect
your hearing, always wear ANSI
approved ear protection when operating this air compressor.
Operating this equipment has the
potential for flying debris to cause
eye injury. Always wear safety glasses 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) .
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 operate 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.
AUTO/OFF
Lever
Figure 7. AUTO/OFF lever.
3. Double check the oil level to make sure
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.
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Model G0471 3 HP Air Compressor
6. Close the drain valve (Figure 8) to
allow the tank to build up pressure.
Line Pressure
Regulation
Figure 8. Drain valve.
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.
Line
Pressure
Tank
Pressure
Figure 9. G0471 Pressure gauges.
The air tool that you attach to the air com
pressor should have a preferred PSI operating level. Set the pressure to be delivered according to the pressure required
by the tool.
To control the air supply to your tool:
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 pressure.
Air Control
Knob
Lock Ring
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 pressure.
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Model G0471 3 HP Air Compressor
-13-
Connecting Tools
3. Connect an air line with a
to the quick-connect coupler on the air
compressor shown in Figure 11.
1
⁄4" NPT plug
When choosing air tools, consider the
amount of air used (cubic feet per minute 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 requiring 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 compressor and the possibility of a fire. This
compressor is fitted with thermal protection inside the motor. If the compressor
overheats, the motor will automatically
turn OFF until it cools down.
To connect air tools to your air compressor:
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: There are many styles of
quick connect couplers. If the quick
connect coupler included with the compressor does not fit the plug on your air
hose, purchase a matched set at your
local hardware store.
Figure 11. Quick connect coupler.
These air compressors are specifically 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 personal injury may occur.
1
⁄4" NPT
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-
Model G0471 3 HP Air Compressor
Storage
When storing your air compressor, follow these guidelines :
1. Turn the compressor switch lever to
OFF.
2. Unplug the compressor.
Failure to unplug the air compressor before storage may result in the
compressor running continuously,
causing overheating, damage to the
compressor, and possibly a fire.
3. Turn the regulator counterclockwise to
set the line pressure to zero.
4. Run the air tool to relieve the air pressure 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.
Water will condense in the air compressor tank. Water left in the tank
can cause the tank to weaken and
corrode, increasing the risk of tank
rupture.
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 personal injury!
Model G0471 3 HP Air Compressor
-15-
SECTION 5: MAINTENANCE
Schedule
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 priate standards of the American
National Standards Institute (ANSI) .
For optimum per formance from your
machine, follow this maintenance schedule and refer to any specific instructions
given in this section.
Daily
1. Check the oil level! Use the sight glass
on the crankcase to make sure the oil
reservoir is at the correct level.
If the compressor is used on a daily basis,
perform the following checks each week.
Weekly
1. Blow dirt and dust off of the air filter
(Figure 12), then re-install.
Figure 12. Air filter foam element.
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.
4. Check air lines and connectors to make
sure they are in good condition.
5. Pull the safety drain valve to make sure
it is working properly (see Draining
Tank on Page 17).
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.
4. When finished using the air compressor, 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-
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.
Model G0471 3 HP Air Compressor
Monthly
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.
Quarterly
After every 300 working hours or 3 months,
perform the following maintenance:
Pressure Safety
Valve
The pressure safety valve prevents damage to the tank by releasing pressure when
the tank reaches maximum capacity.
To check the pressure safety valve:
1. Change the oil in the air compressor
pump as described in Changing Oil on
Page 21.
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.
To drain the tank:
1. Leave the tank pressurized and open
the drain valve, shown in Figure 13, to
drain the water out of the tank.
Note: Draining the air from the tank will
be extremely loud. Wear ear protection
when draining the tank.
1. Locate the pressure safety valve shown
in Figure 14.
Pressure
Safety Valve
Figure 14. Pressure safety valve.
Releasing the safety valve will be
extremely loud. Protect your hearing
with ANSI approved ear protection.
2. Clean any dirt or dust from the pres-
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.
Figure 13. Tank drain valve.
Model G0471 3 HP Air Compressor
Note: The safety valve is preset to
release air if the tank exceeds its maximum pressure. DO NOT try to adjust
the safety valve pressure setting!
-17-
Maintenance Notes
Date
This page is for tracking oil changes and other maintenance procedures to ensure that they are performed at the scheduled intervals.
-18-
Model G0471 3 HP Air Compressor
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.
Motor fails to develop
full power (output of
motor decreases rapidly
with decrease in volt
age at motor terminals).
Motor overheats and
thermal overload turns
motor OFF
.
1. Tank already pressurized.
2. Thermal overload switch
has tripped.
3. Low voltage.
4. Short circuit in motor or
cord, or loose connections.
5. Incorrect fuses or circuit
breakers in power line.
6. Pressure switch is bad.
1. Power line overloaded
with lights, appliances,
and other motors.
-
2. Undersized wires or circuits too long.
1. Cooling fins dirty.
2. Air filter clogged.
3. Compressor is running
too long without a break.
4. Air circulation through the
motor restricted.
1. Motor will not start if tank
is fully pressurized.
2. Wait for motor to cool.
3. Check power line for
proper voltage.
4. Inspect all connections on
motor for loose or shorted
terminals or worn insulation.
5. Install correct fuses or circuit breakers.
6. Replace the pressure
switch.
1. Reduce load on power
line.
2. Increase wire sizes or
reduce length of the circuit.
1. Clean cylinder fins and
motor area.
2. Inspect and clean air filter.
3. Do not use air tools with
CFM needs that exceed
the compressor CFM rating.
4. Clean out motor to pro-
vide normal air circulation.
Model G0471 3 HP Air Compressor
-19-
Symptom Possible Cause Possible Solution
Loud repetitious noise
coming from air com
pressor.
Low pressure at the
tool.
Low pressure at the
tanks, or tank pressure
drops after co
is turned OFF.
Compressor knocking. 1. Improper oil level.
Pressure relief valve
stays open and motor
won’t stop running.
mpressor
1. Pulley setscrews or keys
-
are missing or loose.
2. Motor fan is hitting the
cover.
1. Pressure regulator.
2. Air leaks in hoses.
3. Pressure gauge bad.
4. Pressure switch turns the
motor OFF too soon.
1. Air leaks in tanks or delivery pipes.
2. Drain valve open.
3. Air filter clogged.
4. Leaking check valve.
5. Pressure relief valve
releasing below 120 PSI.
6. Gaskets leaking.
7. Worn rings.
8. Pressure switch turns the
motor OFF too soon.
2. Air filter clogged.
3. Piston assembly loose.
1. Pressure switch
too high.
2. Faulty pressure switch,
unit is trying to overpressure the tank.
3. Faulty pressure relief
valve.
adjusted
1. Inspect keys and setscrews. Replace or
tighten if necessary.
2. Adjust fan cover mounting
position, tighten fan, or
shim fan cover.
1. Adjust pressure regulator,
if no improvement, inspect
regulator for leaks or
replace.
2. Check air hoses and all
connections for leaks (see
Page 22).
3. Replace the pressure
gauge.
4. Adjust the pressure switch
(see Page 23)
1. Check air tanks, pipes and
all connections for leaks
(see Page 22).
2. Close drain valve.
3. Inspect and clean air filter.
4. Repair the check valve
(see Page 22).
5. Replace pressure relief
valve.
6. Check gaskets on cylinder
head assembly, repair or
replace as needed.
7. Inspect and replace pump
piston rings.
8. Adjust the pressure switch
(see Page 23).
1. Check oil level and add oil
(see Page 10).
2. Inspect and clean air filter.
3. Inspect and repair piston
and connecting rod.
1. Adjust the pressure switch
(see Page 23)
2. Turn compressor OFF,
unplug from power supply, and empty tank.
DO NOT USE until switch
is replaced.
3. Relief valve is reliev-
ing pressure too early.
Replace pressure relief
valve.
-20-
Model G0471 3 HP Air Compressor
Symptom Possible Cause Possible Solution
Air leaks from pressure
switch.
Air is dirty or has exces
sive moisture.
1. Faulty check valve.
2. Faulty pressure switch.
-
1. Tank is not drained.
2. Delivery pipes are dirty.
1. Repair the check valve
(see Page 22).
2. Replace pressure switch.
1. Open drain valve and
make certain all the water
is drained out.
2. Remove delivery pipes,
clean out and replace.
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.
To change the oil:
1. Unplug the air compressor and drain
all the air from the tank.
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.
Oil Drain
Cap Screw
5. Replace the oil drain cap screw and
remove the oil breather fill plug shown
in Figure 16.
Oil Breather
Fill Plug
Figure 16. Oil breather fill plug.
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.
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.
Model G0471 3 HP Air Compressor
-21-
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 pressure switch to leak air.
To fix the check valve:
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.
Cap
Figure 17. Check valve.
3. Inspect the O-ring and diaphragm
(Figure 18) for damage and dirt.
Diaphragm
O-ring
Air leaks will cause low air output and
increase the time the compressor must
run.
To find air leaks:
1. Turn the compressor OFF when the
tank is fully pressurized and unplug the
compressor.
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.
2. Unscrew the fitting that is leaking. Clean
and wrap teflon tape and/or spread pipe
dope on the threads.
3. Re-install the fitting to the compressor.
To fix air leaking through a valve:
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.
Figure 18. Check valve diaphragm and
spring.
4. Clean dirt off of the diaphragm and Oring and replace any damaged parts.
5. Re-assemble the check valve. Make
sure the diaphragm presses squarely
against the air supply tube opening.
-22-
3. If the valve continues to leak, replace it
with a new valve.
Model G0471 3 HP Air Compressor
Pressure Switch
The pressure switch has been factory set
for the highest PSI that is safe for this
compressor.
The pressure switch ensures the compressor 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 compressor does not reach, or pressurizes beyond the proper PSI level.
To adjust the pressure switch:
1. Unplug the air compressor from the
power supply.
2. Make sure the compressor switch is in
the OFF position.
5. Turn the black plastic pressure adjustment screw (Figure 20) a half turn
clockwise to increase the maximum
tank pressure and a half turn counterclockwise to decrease the pressure.
Maximum
Tank Pressure
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.
7. Connect the compressor to the power
supply and start the compressor. If
the compressor does not automatically turn OFF at 120 PSI, flip the ON/
OFF switch to OFF before the pressure reaches 125 PSI.
Minimum Tank
Pressure
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.
Figure 19. Pressure switch cover.
Model G0471 3 HP Air Compressor
8. If the PSI level still needs adjustment,
repeat Steps 1–7.
9. Replace the cover when the proper
adjustments have been completed.
-23-
Changing V-Belt
3. Remove the V-belt from the motor pul-
ley and fly pulley.
To change the V-belt drive on your air
compressor:
1. Remove the belt guard. The guard is
attached to the compressor frame by
the mounting bolts shown in Figure
21.
Figure 21. Belt guard mounting bolts.
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.
4. Install the new V-belt.
5. Reposition the motor to tension the belt
and secure the mounting bolts loosened in step 2.
Note: A properly tensioned V-belt will
have about a ½" deflection as shown in
Figure 23.
½" of Deflection
Figure 23. V-belt deflection.
6. Replace belt guard.
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
Service Notes
Model G0471 3 HP Air Compressor
-25-
G0471 Parts Breakdown
-26-
Model G0471 3 HP Air Compressor
G0471 Parts List
REF PART # DESCRIPTION REF PART # DESCRIPTION
1 P0471001 CRANKSHAFT 53 P0471053 SPECIAL WASHER
2 P6205 BALL BEARING 6205 54 P0471054 CONNECT
3 P0471003 CONNECTING ROD 55 P0471055 COMPRESSION NUT
4 P0471004 POSITION PIN 56 P0471056 PRESSURE GAUGE
5 PSB12M CAP SCREW M8-1.25 X 40 57 P0471057 PRESSURE GAUGE
6 P0471006 LOWER CRANKCASE GASKET 58 P0471058 SAFETY VALVE
7 P0471007 O-RING 59 P0471059 AIR COCK
8 P0471008 CRANKCASE 60 P0471060 CONNECTOR
9 P0471009 FRONT COVER GASKET 61 P0471061 REGULATOR
10 P0471010 FRONT COVER 62 P0471062 TANK 13.2 GAL
11 P0471011 OIL SEAL 63 PW01M FLAT WASHER 8MM
12 P0471012 BACK COVER 64 PLW04M LOCK WASHER 8MM
13 PLW03M LOCK WASHER 6MM 65 PN03M HEX NUT M8-1.25
14 PB08M HEX BOLT M6-1 X 20 66 PB26M HEX BOLT M8-1.25 X 30
15 P0471015 OIL SIGHT SEAL 67 P0471067 MOTOR
16 P0471016 OIL SIGHT 67-1 P0471067-1 RESET BUTTON
17 PSB52M CAP SCREW M8-1.25 X 10 67-2 PC040C CAPACITOR 40 MFD 450 VAC
18 P0471018 COMPRESSION RING 67-3 PC200A CAPACITOR 200 MFD 250 VAC
19 P0471019 COMPRESSION RING 67-4 P0471067-4 STRAIN RELIEF
20 P0471020 OIL RING 67-5 P0471067-5 CAPACITOR BOX COVER
21 P0471021 PISTON 67-6 P0471067-6 CAPACITOR BOX
22 P0471022 PISTON PIN 67-7 P0471094 FAN
23 PR05M EXT RETAINING RING 15MM 67-8 P0471095 FAN COVER
24 P0471024 LOWER GASKET 68 P0471068 PULLEY
25 P0471025 CYLINDER 69 PK07M KEY 6 X 6 X 20
26 P0471026 UPPER GASKET 70 P0471070 MOTOR POWER CORD
27 P0471027 VALVE PLATE 71 P0471071 POWER CORD
28 PS55M PHLP HD SCR M3-.5 X 10 72 PB08M HEX BOLT M6-1 X 20
29 PLW09M LOCK WASHER 3MM 73 PW03M FLAT WASHER 6MM
30 P0471030 INLET VALVE 74 PLW03M LOCK WASHER 6MM
31 P0471031 OUTLET VALVE 75 PN01M HEX NUT M6-1
32 P0471032 LIMITATION 77 P0471077 SUPPORT BRACKET
33 PS50M PHLP HD SCR M3-.5 X 12 78 P0471078 SAFETY GUARD
34 P0471034 HEAD GASKET 79 P0471079 V-BELT A-34 4L340
35 P0471035 CYLINDER HEAD 80 P0471080 HANDLE
36 PSB45M CAP SCREW M8-1.25 X 45 81 PB118M HEX BOLT M8-1.25 X 45
37 P0471037 AIR FILTER ASSEMBLY 82 P0471082 DRAIN VALVE
38 P0471038 EXHAUST ELBOW 83 PB09M HEX BOLT M8-1.25 X 20
39 P0471039 OIL FILL CAP 84 P0471084 RUBBER FOOT
40 P0471040 O-RING 85 P0471085 AXLE BOLT M10-1.5 X 50
41 P0471041 FLYWHEEL 86 P0471086 PNEUMATIC TIRE 8"
42 PW01M FLAT WASHER 8MM 87 PLW06M LOCK WASHER 10MM
43 PLW04M LOCK WASHER 8MM 88 PN02M HEX NUT M10-1.5
44 PB20M HEX BOLT M8-1.25 X 35 89 P0471089 CABLE CONNECTOR (U)
45 P0471045 CHECK VALVE 90 P0471090 CABLE CONNECTOR (O)
46 P0471046 ELBOW 91 P0471091 CRANKCASE BOTTOM PLATE
47 P0471047 OUTLET TUBE 92 PW05M FLAT WASHER 4MM
48 P0471048 FIN TUBING 93 PS07M PHLP HD SCR M4-.7 X 8
49 P0471049 COMPRESSION NUT 96 P0471096 BACK COVER GASKET
50 P0471050 COMPRESSION NUT 97 PB09M HEX BOLT M8-1.25 X 20
51 P0471051 RELIEF TUBE 98 PHTEK6M TAP SCREW M4 X 16
52 P0471052 PRESSURE SWITCH
Model G0471 3 HP Air Compressor
-27-
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:
techsupport@grizzly.com
Web Site: http://www.grizzly.com
Thank you again for your business and continued support. We hope to serve you again
soon!
WARRANTY CARD
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help us develop better products and services.
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