Grizzly G0954 User manual

MODEL G0954/G0955/
G0956/G0957
G0957G0954 G0956
G0955
STATIONARY AIR COMPRESSORS
OWNER'S MANUAL
(For models manufactured since 11/21)

This manual provides critical safety instructions on the proper setup, operation,
maintenance, and service of this machine/tool. Save this document, refer to it often,
and use it to instruct other operators.
Failure to read, understand and follow the instructions in this manual may result in
fire or serious personal injury—including amputation, electrocution, or death.
The owner of this machine/tool is solely responsible for its safe use. This
responsibility includes but is not limited to proper installation in a safe environment,
personnel training and usage authorization, proper inspection and maintenance,
manual availability and comprehension, application of safety devices, cutting/
sanding/grinding tool integrity, and the usage of personal protective equipment.
The manufacturer will not be held liable for injury or property damage from
negligence, improper training, machine modifications or misuse.
Some dust created by power sanding, sawing, grinding, drilling, and other
construction activities contains chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm. Some examples of these
chemicals are:
• Lead from lead-based paints.
• Crystalline silica from bricks, cement and other masonry products.
• Arsenic and chromium from chemically-treated lumber.
Your risk from these exposures varies, depending on how often you do this type of
work. To reduce your exposure to these chemicals: Work in a well ventilated area,
and work with approved safety equipment, such as those dust masks that are
specially designed to filter out microscopic particles.

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How To Contact Us
Controls & Components
Machine Data Sheet Table
Safety Instructions for Machinery
Safety Guidelines – Definitions
Important Safety Instructions
Before Using the Air Compressor
Power Supply
When Installing or Moving the Compressor
Before Each Use
Power Connection
Plan Ahead to Protect Your Eyes, Hands, Face & Ears
When Operating
Spraying Precautions
Typical Compressor Installation
Glossary of Terms
Starting the Compressor
Draining the Tank
Troubleshooting Guide
Maintenance Operations
Wiring
Parts
Table of Contents
2

2
Compressor Controls
Power Switch: This switch turns the
compressor power ON and OFF.
Pressure Relief Valve: If the pressure
switch does not shut down the motor when
pressure reaches the pre-set level, this
valve will pop open automatically to prevent
over-pressurization. To operate manually,
pull the ring on the valve to relieve air
pressure in the tank.
Tank Pressure Gauge: This gauge
measures the pressure level of the air
stored in the tank. It is not adjustable by the
operator and does not indicate line
pressure.
Drain Valve: Located at the bottom of the
tank, this is used to release moisture that
accumulated through usage.
(G0954 Shown)
Power
Switch
Pressure
Relief Valve
Tank
Pressure
Gauge
Drain Valve
Motor
Pump
Outlet Port
How To Contact Us
To order parts, or other services and inquiries, contact us by phone at
[phone] or email at [email protected].
Record the following information below for service or warranty assistance.
The pump compresses the air and discharges it into the tank, where the air is stored. The
pressure switch (located internally) then shuts down the motor and relieves air pressure in the
pump and transfer tube when the air pressure in the tank reaches the cut-out pressure. As
compressed air is used, and the pressure level in the tank drops to the cut-in pressure, the
pressure switch restarts the motor automatically, without warning, and the pump resumes
compressing air.
The basic components of the air compressor are the electric motor, pump, pressure switch, and
tank. The motor is equipped with an overload protector and an automatic reset. If the motor gets
overheated, the overload protector will shut it down to prevent damage to the motor. When the
motor sufficiently cools, it will automatically restart.
Date of Purchase:
Model Number:
Serial Number:
Controls & Components

STATIONARY
AIR COMPRESSORS
Model # G0954 G0955 G0956 G0957
Product Dimensions
Weight 305 lbs. 325 lbs. 380 lbs.
Width (side-
to-side)/Depth
(front-to-back)/
Height
30" x 22" x
66-1/2" 30" x 22" x 68" 31-1/2" x 26" x 67" 26" x 32" x 68"
Footprint
(Length/Width) 22-1/2" x 19-1/2" 24" x 21-1/2" 24-1/2" x 21"
Shipping Dimensions
Carton Type Wood Crate
Content Machine
Weight 325 lbs. 345 lbs. 400 lbs.
Length x
Width x Height 31" x 24" x 74" 32" x 31" x 76"
Must Ship
Upright Yes
Electricalnce
Power
Requirement
240V,
Single-Phase,
60 Hz
230V, Single-Phase, 60 Hz
Full-Load
Current Rating 15A 22.5A
Minimum
Circuit Size 20A 30A
Connection
Type Permanent (Hardwire to Shutoff Switch)
Switch Type Pressure Switch w/Motor Reset Button
Machine Data Sheet Table
3

Model # G0954 G0955 G0956 G0957
Motor
Horsepower 3 HP 5 HP
Phase Single-Phase
Amps 15A 22.5A
Speed 3450 RPM
Type ODP Capacitor-Start Induction
Power
Transfer Belt
Bearings Shielded & Permanently Lubricated
Centrifugal
Switch/
Contacts Type
External
Operation Information
Compressor
Style Vertical
Pump Type One-Stage Two-Stage
Max. Airflow/
Delivery
(40 PSI)
12 CFM 20 CFM 24 CFM
Max. Airflow/
Delivery
(90 PSI)
10.2 CFM 18 CFM 18.5 CFM
Cut-Out
Pressure 125 PSI 175 PSI
Cut-In
Pressure 95 PSI 145 PSI
Duty Cycle 65/35 85/15
Tank Size 60 Gallons 80 Gallons
Number of
Cylinders 2 3
Pump
Lubrication
Grizzly Model T28041 or 100% Full Synthetic Non-Detergent Air
Compressor Oil
Drain Valve
Type Ball Valve
Regulator No
4

Model # G0954 G0955 G0956 G0957
Output Port Information
Connection
Type Female Threaded Ball Valve
Connection
Size 1/2" NPT
Number of
Connections 1
Hose Included No
Construction Information
Tank Steel
Valves Brass
Paint Type/
Finish Enamel
Other Specifications
Country of
Origin USA
Warranty 1 Year
Serial Number
Location ID Label
Sound Rating 75–78 dB 79–81 dB 77–79 dB 75–77 dB
5

6
OWNER’S MANUAL. Read and understand this owner’s manual BEFORE using machine.
TRAINED OPERATORS ONLY. Untrained operators have a higher risk of being hurt or killed. Only
allow trained/supervised people to use this machine. When machine is not being used, disconnect
power, remove switch keys, or lock-out machine to prevent unauthorized use—especially around
children. Make your workshop kid proof!
DANGEROUS ENVIRONMENTS. Do not use machinery in areas that are wet, cluttered, or have
poor lighting. Operating machinery in these areas greatly increases the risk of accidents and injury.
MENTAL ALERTNESS REQUIRED. Full mental alertness is required for safe operation of
machinery. Never operate under the influence of drugs or alcohol, when tired, or when distracted.
ELECTRICAL EQUIPMENT INJURY RISKS. You can be shocked, burned, or killed by touching
live electrical components or improperly grounded machinery. To reduce this risk, only allow
qualified service personnel to do electrical installation or repair work, and always disconnect power
before accessing or exposing electrical equipment.
DISCONNECT POWER FIRST. Always disconnect machine from power supply BEFORE making
adjustments, changing tooling, or servicing machine. This prevents an injury risk from unintended
startup or contact with live electrical components.
EYE PROTECTION. Always wear ANSI-approved safety glasses or a face shield when operating
or observing machinery to reduce the risk of eye injury or blindness from flying particles. Everyday
eyeglasses are NOT approved safety glasses.
WEARING PROPER APPAREL. Do not wear clothing, apparel or jewelry that can become
entangled in moving parts. Always tie back or cover long hair. Wear non-slip footwear to reduce risk
of slipping and losing control or accidentally contacting cutting tool or moving parts.
HAZARDOUS DUST. Dust created by machinery operations may cause cancer, birth defects, or
long-term respiratory damage. Be aware of dust hazards associated with each workpiece material.
Always wear a NIOSH-approved respirator to reduce your risk.
HEARING PROTECTION. Always wear hearing protection when operating or observing loud
machinery. Extended exposure to this noise without hearing protection can cause permanent
hearing loss.
REMOVE ADJUSTING TOOLS. Tools left on machinery can become dangerous projectiles upon
startup. Never leave chuck keys, wrenches, or any other tools on machine. Always verify removal
before starting!
USE CORRECT TOOL FOR THE JOB. Only use this tool for its intended purpose—do not force it
or an attachment to do a job for which it was not designed. Never make unapproved modifications—
modifying tool or using it differently than intended may result in malfunction or mechanical failure
that can lead to personal injury or death!
Safety Instructions for Machinery

7
AWKWARD POSITIONS. Keep proper footing and balance at all times when operating machine.
Do not overreach! Avoid awkward hand positions that make workpiece control difficult or increase
the risk of accidental injury.
CHILDREN & BYSTANDERS. Keep children and bystanders at a safe distance from the work area.
Stop using machine if they become a distraction.
GUARDS & COVERS. Guards and covers reduce accidental contact with moving parts or flying
debris. Make sure they are properly installed, undamaged, and working correctly BEFORE operating
machine.
FORCING MACHINERY. Do not force machine. It will do the job safer and better at the rate for
which it was designed.
NEVER STAND ON MACHINE. Serious injury may occur if machine is tipped or if the cutting tool
is unintentionally contacted.
STABLE MACHINE. Unexpected movement during operation greatly increases risk of injury or loss
of control. Before starting, verify machine is stable and mobile base (if used) is locked.
USE RECOMMENDED ACCESSORIES. Consult this owner’s manual or the manufacturer for
recommended accessories. Using improper accessories will increase the risk of serious injury.
UNATTENDED OPERATION. To reduce the risk of accidental injury, turn machine OFF and ensure
all moving parts completely stop before walking away. Never leave machine running while
unattended.
MAINTAIN WITH CARE. Follow all maintenance instructions and lubrication schedules to keep
machine in good working condition. A machine that is improperly maintained could malfunction,
leading to serious personal injury or death.
DAMAGED PARTS. Regularly inspect machine for damaged, loose, or mis-adjusted parts—or any
condition that could affect safe operation. Immediately repair/replace BEFORE operating machine.
For your own safety, DO NOT operate machine with damaged parts!
MAINTAIN POWER CORDS. When disconnecting cord-connected machines from power, grab and
pull the plug—NOT the cord. Pulling the cord may damage the wires inside. Do not handle cord/plug
with wet hands. Avoid cord damage by keeping it away from heated surfaces, high traffic areas,
harsh chemicals, and wet/damp locations.
EXPERIENCING DIFFICULTIES. If at any time you experience difficulties performing the intended
operation, stop using the machine! Contact Technical Support.

8
Safety is a combination of common sense, staying alert, and knowing how your compressor
works. Read this manual to understand this compressor.
DANGER
means if safety information is not followed someone will be seriously injured or killed.
WARNING
means if safety information is not followed someone could be seriously injured or killed.
CAUTION
means if safety information is not followed someone may be moderately injured.
Improper operation or maintenance of this product could result in serious injury and property
damage. Read and understand all warnings and operation instructions before using this compressor.
Things You Should Know Inspect Your Work Area
Air compressors are utilized in a variety of air
system applications. Because air compressors
and other components (hoses, connectors, air
tools, spray guns, etc.) make up a high-pressure
pumping system, the following safety pre-
cautions should be observed at all times.
Only persons familiar with these rules of
safe operation should use the air
compressor.
1. Read the instruction manual carefully before
attempting to assemble, disassemble, or
operate your system. Be thoroughly familiar
with the controls and the proper use of the
equipment.
2. Review and understand all safety instructions
and operating procedures in this manual.
3. Review the maintenance methods for this
compressor (See Maintenance
Operations section on Page 19).
1. Keep work area clean.
2. Cluttered areas and benches invite accidents.
Floors must not be slippery from wax or dust.
Inspect Your Compressor
1. To reduce the risk of injury from accidental
starting, turn switch off and disconnect the
power before checking compressor.
2. If any part is missing, bent, or broken in any
way, or any electrical part does not work
properly, keep the compressor off and
disconnected.
3. Check hoses for weak or worn conditions
before each use, making certain all connections
are secure. Do not use if defect is found.
Do not operate compressor if damaged during
shipping, handling, or use. Damage may
cause compressor to burst and cause injury or
property damage.
This compressor is not designed for and should
not be used for breathing air applications.
Safety Guidelines - Definitions
Important Safety Instructions
WARNING
DANGER
Before Using the Air Compressor

9
WARNING
CAUTION
Availability
Before installing the machine, consider the
availability and proximity of the required power
supply circuit. If an existing circuit does not meet
the requirements for this machine, a new circuit
must be installed. To minimize the risk of
electrocution, fire, or equipment damage,
installation work and electrical wiring must be
done by an electrician or a qualified service
personnel in accordance with all applicable
codes and standards.
Electrocution or fire may occur if machine is
not correctly grounded and attached to the
power supply. Use a qualified electrician to
ensure a safe power connection.
Full-Load Current Rating
The full-load current rating is the amperage a
machine draws at 100% of the rated output
power. On machines with multiple motors, this
is the amperage draws by the largest motor or
sum of all motors and electricals devices that
might operate at one time during normal
operations.
Full-Load Current Rating (G0954): 15A
Full-Load Current Rating (G0955): 22.5A
Full-Load Current Rating (G0956): 22.5A
Full-Load Current Rating (G0957): 22.5A
The full-load current is not the maximum
amount of amps that the machine will draw. If
the machine is overloaded, it will draw
additional amps beyond the full-load rating.
If the machine is overloaded for a sufficient
length of time, damage, overheating, or fire
may result—especially if connected to an
undersized circuit. To reduce the risk of these
hazards, avoid overloading the machine
during operation and make sure it is
connected to a power supply circuit that meets
the requirements in the following section.
Circuit Information
A power supply circuit includes all electrical
equipment between the main breaker box or fuse
panel in your building and the incoming power
connections inside the machine. This circuit must
be safely sized to handle the full-load current that
may be drawn from the machine for an extended
period of time. (If this machine is connected to a
circuit protected by fuses, use a time delay fuse
marked D.)
For your own safety and protection of property,
consult an electrician if you are unsure about
wiring practices or applicable electrical codes.
Note: The circuit requirements in this manual are
for a dedicated circuit—where only one machine
will be running at atime. If this machine will be
connected to ashared circuit where multiple
machines will be running at the same time,
consult aqualified electrician to ensure the circuit
is properly sized.
Circuit Requirements for 220V
These machines are prewired to operate on a
power supply circuit that has a verified ground
and meets the following requirements:
G0954
Nominal Voltage: 208V/220V/230V/240V
Cycle: 60 Hz
Phase: Single-Phase
Circuit Rating: 20A
G0955
Nominal Voltage: 208V/220V/230V/240V
Cycle: 60 Hz
Phase: Single-Phase
Circuit Rating: 30A
G0956
Nominal Voltage: 208V/220V/230V/240V
Cycle: 60 Hz
Phase: Single-Phase
Circuit Rating: 30A
G0957
Nominal Voltage: 208V/220V/230V/240V
Cycle: 60 Hz
Phase: Single-Phase
Circuit Rating: 30A
Power Supply

10
WARNING
Connection Type
A permanently connected (hardwired) power
supply is typically installed with wires running
through mounted and secured conduit. A
disconnecting means, such as a locking switch
(see following figure) must be provided to allow
the machine to be disconnected (isolated) from
the power supply when required. This
installation must be performed by an electrician
in accordance with all applicable electrical
codes and ordinances.
Grounding Requirements
These machines must be grounded! In the event
of certain types of malfunctions or breakdowns,
grounding provides a path of least resistance for
electric current in order to reduce the risk of
electric shock.
Power supply connections that are hardwired to
the power source must be connected to a
grounded metal permanent wiring system, or to a
system having an equipment-grounding
conductor.
Serious injury could occur if you connect one of
these machines to power before completing the
setup process. DO NOT connect to power until
instructed later in this manual.
Extension Cords
Since these machines must be permanently
connected to the power supply, an extension
cord cannot be used.
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11
NOTICE
This compressor is extremely top heavy. It
must be bolted to the floor with vibration pads
(see figure below) before operating to prevent
equipment damage, injury, or death. DO NOT
tighten bolts completely as this may cause
stress to the tank welds.
To Reduce the Risk of a Dangerous
Environment
1. Keep work area well lit.
2. Operate compressor in a well-ventilated
area free from flammable liquids and vapors.
3. Operate compressor in a ventilated area so
that compressor may be properly cooled and
the surrounding air temperature will not be
more than 100°F.
4. Never use a compressor in a wet
environment.
5. Protect material lines and air lines from
damage or puncture. Keep hose and
wires away from sharp objects, chemical
spills, oil, solvents, and wet floors.
Do not secure compressor with toggle bolts
into drywall. Drywall sheeting or plaster will
not support the weight of the compressor.
6. A minimum clearance of 18 inches
between the compressor and a wall is
required because objects could
obstruct airflow.
7. The compressor should be located where it
can be directly wired to a circuit breaker.
The compressor should be wired by a
qualified electrician.
8. Never store flammable liquids or
gases in the vicinity of an operating
compressor.
9. Do not locate the compressor air inlet
near steam, paint spray, sandblasting
areas, or any other source of
contamination. The debris could
damage the motor and pump.
Never use plastic (PVC) pipe for
compressed air. Serious injury or death
could result.
Never use the shipping pallet for
mounting the compressor.
Electric compressors are not suitable for
outdoor installation.
Never install a shut-off valve between the
compressor pump and tank. Personal
injury and/or equipment damage could
occur.
WARNING
WARNING
CAUTION
Flat
Washer
Floor
Vibration Pad
Compressor
Leg
Shim
(If Necessary)
Lag Bolt
WARNING
When Installing or Moving the Compressor
WARNING

12
WARNING
Inspect Your Work Area
1. Keep work area clean. Cluttered areas and
benches invite accidents.
2. The floor must not be slippery from wax or
dust.
Inspect Your Compressor
1. To reduce the risk of injury from accidental
starting, turn the switch off and disconnect
power.
2. If any part is missing, bent, or broken in
any way, or any electrical part does not
work properly, keep the compressor off
and disconnect power. Do not use if
defect is found.
3. Check hoses for weak or worn condition
before each use, making certain all
connections are secure. Do not use if a
defect is found.
4. Pull pressure relief valve ring daily to
ensure proper function and clear
possible obstructions.
Electrocution or fire may occur if machine is
ungrounded, incorrectly connected to power,
or connected to an undersized circuit. Use a
qualified electrician to ensure a safe power
connection.
Once your machine is set up and assembled
as previously described in this manual, it is
ready to be connected to the power supply.
Hardwiring to Power Supply
Hardwire setups require power supply lines
to be enclosed inside of conduit, which is
securely mounted and constructed in
adherence to applicable electrical codes.
A hardwire setup for these machines must be
equipped with a locking disconnect switch as
a means to disconnect power during
adjustments or maintenance which is a
typical requirement for many lock-out/tag-out
safety programs.
The following figure shows a simple diagram
of a hardwire setup with a locking disconnect
switch between the power supply and the
machine.
Due to the complexity required for planning,
bending, and installing the conduit necessary
for the code-compliant hardwire setup, an
electrician or other qualified person MUST
perform this type of installation.
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Before Each Use
Power Connection

13
Dress for Safety
1. Wear safety glasses meeting ANSI Z87.1 (or
in Canada CSA Z94.3-99) and use hearing
protection when operating the unit. Everyday
glasses are not safety glasses.
2. Wear shoes to prevent shock hazards.
3. Tie back long hair.
Pay Attention to Your Hands
Keep fingers away from running compressor.
Fast moving and hot parts may cause injury
and/or burns.
Be careful when touching the exterior of
compressor, pump, motor, and air lines; they
may become hot enough to cause injury.
Never operate the compressor without a belt
guard. The compressor can start automatically
without warning. Personal injury or property
damage could occur from contact with moving
parts.
The compressor may be hot even if the
unit is stopped.
Use of a mask or respirator per chemical
manufacturers’ instructions may be
necessary if there is a chance of inhaling
toxic fumes. Read mask and respirator
instructions carefully. Consult a safety
expert if you are not sure about the use of
certain masks or respirator.
1. Do not exceed the pressure rating of any
component of the system. Exceeding the
maximum pressure rating of tools or
accessories could cause an explosion
resulting in serious injury.
2. Release pressure within the system slowly
to prevent flying dust and debris.
3. If the equipment starts to abnormally vibrate,
STOP the compressor immediately and
check for the cause.
4. Never use oxygen, carbon dioxide, or other
bottled gases as a power source for air tools
and never connect to an air source that is
capable of exceeding 90 PSI.
5. DO NOT use inflator nozzles for dusting
applications.
Never change the safety valve or pressure
switch settings. Keep safety valve free from
paint and other accumulations. See machine
ID label for maximum operating pressure. Do
not operate with the pressure switch set
higher than the maximum operating pressure.
WARNING
CAUTION
WARNING
Plan Ahead to Protect Eyes, Hands, Face & Ears
When Operating
WARNING
WARNING
WARNING

14
Never point a nozzle or spray gun at yourself
or any other person or animal. Accidental
discharge may result in serious injury.
Reduce the Risk of a
Dangerous Environment
Extreme caution should be taken when
spraying flammable liquids as the spark from
a motor or pressure switch may cause a fire
or explosion. Ample ventilation must be
provided.
Spray in a well-ventilated area to keep fumes
from collecting and causing serious injury and
fire hazards.
1. Do not spray in the vicinity of open flames
or other places where a spark can cause
ignition. Do not smoke when spraying
paint, insecticides, or other flammable
substances.
Be Informed About the Materials
You Use
1. When spraying with solvents or toxic
chemicals, follow the instructions provided
by the chemical manufacturer. Consult a
safety expert if unsure about the use of
masks or respirators.
2. If the material you intend to spray contains
trichloreoethane and methylene chloride,
do not use accessories that contain
aluminum or galvanized materials, as
these chemicals can react with galvanized
components causing corrosion and
weakening equipment. Use stainless steel
accessories.
WARNING
DANGER
Vibration Pads (x4)
Spraying Precautions
Air
Dryer
Air
Regulator
Air
Tool
Typical Compressor Installation
WARNING

15
CAUTION
Air Filter
Porous element contained within a metal or
plastic housing attached to the compressor
cylinder head which removes impurities from
the intake air of the compressor.
Air Tank
Cylindrical component which contains the
compressed air.
Check Valve
Device which prevents compressed air from
flowing back from the air tank to the
compressor pump.
Electric Motor
Device which provides the rotational force
necessary to operate the compressor pump.
Pressure Gauge
Device which shows the tank or regulated
pressure of the compressed air.
Pressure Switch
Device which automatically controls the
ON/OFF cycling of the compressor. It
stops the compressor when the cut-off
pressure in the tank is reached and starts
the compressor when the air pressure
drops below the cut-in pressure.
PSI (Pounds per Square Inch)
Measurement of the pressure exerted
by the force of air. The actual PSI is
measured by a pressure gauge on the
compressor.
Pump
Device which produces the compressed air
with a reciprocating piston contained within a
cylinder.
Safety Valve
Device which prevents air pressure in
the air tank from rising over a
predetermined limit.
Thermal Overload Switch
Device, integrated into the electric motor
winding, which automatically shuts OFF the
compressor if the temperature of the
electric motor exceeds a predetermined
limit.
Prior to actually running the compressor,
check the following items:
Crankcase oil - Check oil level at sight glass.
Oil level should be 1/2 full (or slightly higher)
in the oil sight glass.
Make sure all rags, tools, oil, etc. are away
from the unit.
Open the air system to free it of any pressure.
Switch the compressor on for a few
revolutions to make sure the rotation is
correct. Correct rotation is clockwise when
facing the sight glass on the pump.
Operate the compressor for a few minutes
unloaded (air system open) then allow the
compressor to pump up. Make sure the
electrical pressure switch properly
switches off the compressor when the air
pressure reaches the PSI indicated below:
G0957: 175 PSI
G0954/G0955/G0956: 125 PSI
Make sure the pressure in the tank does
not exceed its rating. If the pressure gauge
indicates a pressure that is higher than the
maximum pressure, shut off compressor
immediately and call your distributor.
Glossary of Terms
Starting the Compressor

16
Draining the Tank
Oil and moisture residue must be drained from the air receiver daily or after
each use. Accumulations of oil residue in the receiver can be ignited by
embers of carbon created by the heat of compression—causing an explosion,
damage to property, and injury to personnel.
Do not open a manual tank drain valve on any air tank containing more than
30 PSI of air pressure!
Never attempt to relieve an air tank by removing a pipe plug or any other
system component!
Manually Draining Air Tank:
Disconnect & lockout the compressor from the power source.
Tank(s) subjected to freezing temperatures may contain ice. Store the compressor in a heated
area before attempting to drain moisture from the tank(s). Reduce the air pressure in the tank to
30 PSI by pulling the pressure relief valve ring.
Put on safety glasses to protect your eyes from debris that escaping air moisture may propel
before you slowly open the drain valve and allow the moisture and air mixture drain from the tank.
Once the moisture has been completely drained, close the drain valve.
We recommend inspecting your tank at scheduled intervals. Tanks should be visually inspected
yearly and hydrostatically inspected every 10 years.
Refer to federal, state or provincial, or local codes for mandatory air tank maintenance
information.

17
TROUBLESHOOTING GUIDE
Low discharge pressure.
1. Compressor too small for
application.
2. Air leaks.
3. Restricted intake air.
4. Blown gasket(s).
5. Broken or misaligned valves.
1. Reduce air demand or use a compressor
with more air capacity.
2. Listen for air leaks. Apply a soap solution
to all fittings and connections. Bubbles
will form at points of leakage. Tighten
or replace fittings or connections.
3. Clean or replace air filter.
4. Replace necessary gaskets.
5. Remove head and inspect for broken or
misaligned valves. Replace valves, if
broken.
Install a new head gasket each time head
is removed.
Excessive noise
“knocking”.
1. Loose drive pulley or flywheel.
2. Low on oil.
3. Worn connecting rod or
connecting rod bearing.
4. Noisy check valve.
1. Tighten drive pulley or flywheel bolt.
2. Check for proper oil level. Low or dirty
oil may cause bearing damage.
3. Replace connecting rod and/or connecting
rod bearings.
4. Replace check valve.
Do not remove check valve with air pressure
in tank.
Excessive oil carryover.
1. Worn piston rings.
2. Restricted intake air.
3. Too much oil in compressor.
4. Incorrect oil viscosity.
1. Replace with new piston rings.
2. Clean or replace air filter.
3. Drain oil to proper oil level.
4. Use a quality non-detergent oil
specified for your machine (Page 4).
Water in tank and/or
discharge line.
1. Normal. Amount of water will
increase as humidity in the
air increases.
1. Drain tank at least once per day. Add an
inline filter to reduce moisture in the air
line.
Will not run or motor
hums.
1. Low voltage.
2. Malfunctioning pressure switch.
3. Malfunctioning check valve.
1. Check voltage with volt meter across both
legs of incoming power. Check reset button
on motor.
2. Repair or replace pressure switch.
3. Replace check valve or pressure switch.
Do not remove check valve with air pressure
in tank.
WARNING
WARNING
WARNING

18
TROUBLESHOOTING GUIDE (Cont.)
Tank does not hold
pressure when not
running and shut off
valve is closed.
1. Malfunctioning check valve.
2. Loose fittings or connections.
3. Crack or pin hole in tank.
1. Replace check valve.
Do not remove check valve with air pressure in
tank.
2. Tighten or replace fittings or connections.
3. Replace tank. Do not attempt to repair tank.
Pressure switch un-
loader constantly
leaking air.
1. Malfunctioning check valve.
1. Replace check valve if unloader bleeds
constantly.
Do not remove check valve with air pressure in
tank.
Pressure switch not
unloading.
1. Malfunctioning pressure switch.
1. Replace pressure switch if it does not release
air pressure briefly when unit shuts off.
Do not remove pressure switch with air pressure
in tank.
Excessive vibration.
1. Improper installation.
2. Loose belts.
3. Misaligned flywheel or
drive pulley.
1. Make sure unit is mounted on a level surface
with vibration pads.
2. Replace belts. Align and tighten properly.
3. Align flywheel and drive pulley.
Overheating.
1. Compressor too small for
application.
2. Cooling surfaces dirty.
3. Improper cooling.
1. Reduce air demand or use a compressor
with more air capacity.
2. Clean all cooling surfaces of dirt and dust.
3. Install compressor in an area with adequate
cool, dry air.
Breaker or reset
repeatedly trips.
1. Incorrect breaker size.
2. Low voltage.
3. Malfunctioning motor.
4. Loose electrical
connections.
5. Malfunctioning pressure
switch.
6. Malfunctioning check
valve.
1. Make sure the breaker is sized properly
(Page 9-10).
2. Check voltage with volt meter across
both legs of incoming power.
3. Replace motor.
4. Check all electrical connections.
5. Adjust or replace pressure switch.
6. Replace check valve.
Do not remove check valve with air pressure in
tank.
WARNING
WARNING
WARNING
WARNING