8475014
Please read this manual before use.
V 3.4
80 Gallon 2-stage Cast Iron
Industrial Air Compressor
200-2915-F_1-10-19
User Manual
2For technical questions call 1-800-665-8685
8475014
V 3.4
80 Gallon 2-stage Cast Iron
Industrial Air Compressor
SPECIFICATIONS
Air Delivery 21 CFM @ 100 PSI
20 CFM @ 175 PSI
Air Tank Capacity 80 Gallons (302.8 litres)
Max. Air Pressure 175 PSI
Cut-In Pressure 145 PSI
Cut-Out Pressure 175 PSI
Compressor Type Belt Driven
Pump Style Cast Iron, Two Stage, Oil lubricated
Pump Oil Capacity 53.25 oz (1.57 litres)
Current Rating 31A
Voltage Rating 240V
Noise Rating 82 dB
INTRODUCTION
Designed for auto body shops, agricultural operations and industrial applications
FUNCTIONS
Industrial performance delivers maximum CFM @ 175 PSI; provides enough power to operate
more than one air tool or device at one time. Cast iron, industrial duty, two stage compressor
pump features hardened steel disc valves, oversized taper roller bearings, fully balanced cast
iron flywheel and splash type lubrication. Industrial class, single phase electric motor equipped
with pre-wired and mounted magnetic starter. Uniquely designed metal belt guard improves
compressor pump cooling by as much as 60° F over other belt guard designs. Large capacity,
80 gallon ASME certified tank.
80 Gallon 2-stage Cast Iron Industrial Air Compressor
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8475014 V 3.4
SAFETY
WARNING! Read and understand all instructions before using this device. The operator must
follow basic precautions to reduce the risk of personal injury and/or damage to the equipment.
Keep this manual for safety warnings, precautions, operating or inspection and
maintenance instructions.
HAZARD DEFINITIONS
Please familiarize yourself with the hazard notices found in this manual. A notice is an alert that
there is a possibility of property damage, injury or death if certain instructions are not followed.
DANGER! This notice indicates an immediate and specific hazard that will result in severe
personal injury or death if the proper precautions are not taken.
WARNING! This notice indicates a specific hazard or unsafe practice that could result in severe
personal injury or death if the proper precautions are not taken.
CAUTION! This notice indicates a potentially hazardous situation that may result in minor or
moderate injury if proper practices are not taken.
NOTICE! This notice indicates that a specific hazard or unsafe practice will result in
equipment or property damage, but not personal injury.
WORK AREA
1. Operate in a safe work environment. Keep your work area clean, well lit and free
of distractions.
2. Keep anyone not wearing the appropriate safety equipment away from the work area.
3. Store devices properly in a safe and dry location. Keep devices out of the reach of children.
4. Do not install or use in the presence of flammable gases or liquids.
Always operate compressor in a well-ventilated area. Locate the compressor at least 20 feet away
from work area if spraying flammable materials.
PERSONAL SAFETY
WARNING! Wear personal protective equipment approved by the Canadian Standards
Association (CSA) or American National Standards Institute (ANSI).
1. Wear personal protection equipment such as ANSI Z87.1 approved safety goggles, respirator,
gloves, steel toe footwear or a hard hat as warranted by the work environment.
1.1 This device can cause hearing damage. Wear hearing protection with an appropriate
Noise Reduction Rating, especially if using it for extended periods.
2. Control the device, personal movement and the work environment to avoid personal injury or
damage to the device.
3. Do not operate any device when tired or under the influence of drugs, alcohol
or medications.
80 Gallon 2-stage Cast Iron Industrial Air Compressor
4For technical questions call 1-800-665-8685
8475014
V 3.4
SPECIFIC SAFETY PRECAUTIONS
1. Risk of Bursting
1.1 Serious injury or death may occur from an air tank explosion if the air tank is not
properly maintained or if modifications, alterations or repairs are attempted. Drain air
tank daily or after each use. Never drill into, weld, patch or modify the air tank. Replace
the tank immediately or replace the entire compressor, if a leak develops.
1.2 Serious injury or death may occur if modifications are made to the pressure switch,
safety relief valve or other components that control the tank pressure. Never make
adjustments to the components that control tank pressure. Do not make alterations to
the factory operating pressure settings. Check operation of the pressure relief valve on
a regular basis and never operate without a factory approved pressure relief valve.
1.3 Do not use plastic or pvc pipe for compressed air. Use only galvanized steel pipe and
fittings for compressed air distribution lines.
1.4 Check the manufacturer’s maximum pressure rating for air tools and accessories.
Compressor outlet pressure must be regulated so as to never exceed the maximum
pressure rating of the tool.
2. Risk of Explosion or Fire
2.1 Serious injury may occur if a fire is caused by overheating due to inadequate ventilation
or restrictions to any of the compressor’s ventilation openings. Never place objects
against or on top of an air compressor. Always operate air compressor at least 12 in.
away from any wall or obstruction. Always operate in a clean, dry and
well-ventilated area.
2.2 Unattended operation of this compressor could result in personal injury or property
damage. To reduce the risk of fire, do not allow the compressor to operate unattended.
Always disconnect electrical power by turning the pressure switch to o and drain the
tank daily or after each use.
3. Risk of Burn
Serious burn injuries could occur from touching exposed metal parts such as the
compressor head or motor during operation and even after the compressor is shut
down for some time. Never touch any of the exposed metal parts during operation and
for an extended period of time after the air compressor has shut down. Do not attempt
maintenance on the unit until it has been allowed to completely cool.
4. Risk from Moving Parts
4.1 Serious injury may occur from moving parts such as the flywheel or belts if they came
in contact with you or your clothing. Never operate the air compressor without the
protective cover installed. Replace a damaged protective cover immediately.
4.2 Serious injury may occur if repairs are attempted with damaged, missing or removed
protective guards, shrouds or missing covers. All repairs to the air compressor should be
made only by authorized or trained service personnel.
4.3 This unit starts automatically. Always shut o the compressor and bleed all pressure
from the system before servicing the compressor and when the compressor is not
in use.
5. Flying Objects
5.1 Serious injury may occur from loose debris being propelled at high speeds from the
compressed air stream. Always wear OSHA approved safety glasses to protect the eyes
during operation of the air compressor.
5.2 Never point the air stream or tools at any point of your body, other people or animals.
Debris and dust may be ejected without warning. Always turn o the air compressor
and drain tank pressure completely before attempting maintenance or attaching air
tools. Release pressure slowly from the system.
6. Risk of Damage to Air Compressor or Property
6.1 Failure to transport or operate the air compressor properly may result in major repair
expenses. Always run the compressor in a level, secure position that keeps it from
tipping or falling during use.
80 Gallon 2-stage Cast Iron Industrial Air Compressor
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8475014 V 3.4
6.2 Do not operate without an air filter or in a corrosive environment.
6.3 Always transport in a level position and use protective mats to keep truck beds clean,
etc. Fasten the compressor down securely. Pressure must be released from the tank
before transporting.
6.4 In cold climates, drain the tank after each use to avoid ice build up.
7. Stationary tanks should be level to distribute oil properly and prevent damage to the tank
and compressor. The tank’s feet should be shimmed so the pump base is level to within 1/8 in.
All feet must be supported prior to attaching to the floor.
7.1 Always operate the compressor in a stable secure position to prevent accidental
movement of the unit.
GENERAL SAFETY PRECAUTIONS
ELECTRICAL SAFETY
WARNING! All wiring should be performed by a qualified electrician.
1. Disconnect device from power source before cleaning, servicing, changing parts/accessories
or when not in use.
2. Protect yourself against electric shocks when working on electrical equipment. Avoid body
contact with grounded surfaces. There is an increased chance of electrical shock if your body
is grounded.
3. Failure to provide adequate grounding to this product could result in serious injury or
death from electrocution. Make certain that the electrical circuit to which the compressor is
connected provides proper electrical grounding, correct voltage and adequate
fuse protection.
4. Do not alter any parts of the device or accessories. All parts and accessories are designed
with built-in safety features that may be compromised if altered.
5. Make certain that power source conforms to requirements of your equipment.
6. To reduce the risk of electric shock, do not expose to rain or use on a wet surface. Store the
compressor indoors.
7. When wiring an electrically driven device, follow all electrical and safety codes, as well as the
most recent Canadian Electrical Code (CE) and Canadian Centre for Occupational Health and
Safety (CCOHS).
USE AND CARE OF THE DEVICE
1. Use the correct device for the job. This device was designed for a specific function. Do not
modify or alter this device or use it for an unintended purpose.
2. Conduct regular maintenance according to the schedule found in the Maintenance section.
PARTS IDENTIFICATION
WARNING! Do not operate the device if any part is missing. Replace the missing part before
operating. Failure to do so could result in a malfunction and personal injury.
Remove the parts and accessories from the packaging and inspect for damage. Make sure that all
items in the parts list are included.
Contents:
• Air Compressor
80 Gallon 2-stage Cast Iron Industrial Air Compressor
6For technical questions call 1-800-665-8685
8475014
V 3.4
BASIC AIR COMPRESSOR COMPONENTS
The basic components of the air compressor are the
electric motor, pump, pressure switch,
and tank.
The electric motor (A) powers the pump.
The pump (B) compresses the air and discharges it into
the tank. The tank (C) stores the compressed air.
The pressure switch (D) 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 and the pump resumes
compressing air.
A magnetic starter (E) is required for the proper
operation of the compressor. A magnetic starter that is
not factory mounted on the compressor can be mounted
on the wall if desired. Mount as close to compressor
as possible. Size the wires, protect them with conduit and provide branch circuit protection per
electrical and safety codes, as well as the most recent Canadian Electrical Code (CE) and Canadian
Centre for Occupational Health and Safety (CCOHS).
COMPRESSOR CONTROLS
Main Power Disconnect
Install a main power disconnect switch in the power line to the compressor, near the compressor’s
location for ease of use and safety. The disconnect switch functions are selected manually. When
the switch is in the ON position, power is supplied to the compressor. The pressure switch will start
up or shut down the compressor automatically, based on air demand. Always select OFF when the
compressor is not being used. When turned OFF, the main power disconnect switch shuts o all
power to the compressor.
Magnetic Starter Reset Switch
WARNING! Ensure that all guards and shrouds are in place before pressing the reset switch to
restart the motor.
If the motor shuts down because of an overload, wait 10–15 minutes so the motor can cool down,
then press (never force) the reset switch on front of the magnetic starter to restart the motor.
A. PRESSURE SWITCH
WARNING! The pressure switch is preset. Do not attempt to tamper or adjust the setting.
The pressure switch controls the level of air pressure in the tank by automatically starting and
stopping the motor, as required to maintain the factory preset pressure level. The pressure switch
also automatically bleeds pressure from the pump head when the pump stops. This feature
eliminates back pressure in the pump, ensuring easier starting.
Fig.1
80 Gallon 2-stage Cast Iron Industrial Air Compressor
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8475014 V 3.4
B. TANK SAFETY VALVE
The tank safety valve is designed to discharge
tank pressure at a predetermined setting,
slightly above the compressor’s cut-out pressure
setting. The safety valve will protect against high
pressure ruptures if the pressure switch does not
shut o the compressor. Do not tamper with or
attempt to eliminate the tank safety valve.
C. PRESSURE RELIEF VALVE
The air compressor is equipped with a pressure
relief valve (located on the bottom of the
pressure switch) that is designed to release
compressed air from the compressor head and
outlet tube when the compressor reaches the
cut-out pressure setting or is shut o. The
pressure valve allows the motor to restart freely.
When the motor stops running, air will be heard
escaping from this valve for a few seconds. No
air should be heard leaking when the motor is running or after a brief release of air after reaching
the cut-out pressure.
Do not tamper with or attempt to eliminate the safety relief valve.
D. 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.
ASSEMBLY
LOCATION INSTALLATION
Locate the compressor according to the
following guidelines:
1. For optimum performance, locate the
compressor close to the power panel (see
section Main Power Panel) and as close as
possible to the place where the air will be
used. This ensures maximum power to the
compressor and maximum air pressure to the
air tool. If both of these conditions cannot
be met, it is better to locate the compressor
close to the power panel and use a longer
hose to reach the usage area.
2. The flywheel side of the compressor must be
at least 12 inches (30.5 cm) from any wall or
obstruction, in a clean, well-ventilated area, to ensure sucient air flow and cooling.
3. In cold climates, locate the compressor in a heated building to reduce problems with
lubrication, motor starting and freezing of water condensation.
4. The compressor must be level to ensure proper lubrication of the pump and good drainage
of the moisture in the tank.
5. Vibration pads under the tank’s feet are recommended.
Fig.2
Fig.3
80 Gallon 2-stage Cast Iron Industrial Air Compressor
8For technical questions call 1-800-665-8685
8475014
V 3.4
ELECTRICAL POWER REQUIREMENTS
WARNING! All wiring should be performed by a qualified electrician.
Refer to the air compressor’s serial label for the unit’s voltage and amperage requirements. Ensure
that all wiring is done by a licensed electrician in accordance with all electrical and safety codes,
as well as the most recent Canadian Electrical Code (CE) and Canadian Centre for Occupational
Health and Safety (CCOHS).
MAIN POWER PANEL
For best performance and reliable starting, the air compressor must be plugged or wired into
a dedicated 240V circuit, as close as possible to the main power panel. A circuit breaker is
recommended. Use a time delay fuse if the air compressor is connected to a circuit protected by a
fuse, as the compressor will momentarily draw several times its specific amperage when
first started.
MAIN POWER DISCONNECT SWITCH
Low voltage or an overloaded circuit can make it dicult to start the motor or can cause the
circuit breaker to trip, especially in cold conditions. Low voltage can have several sources:
• Low supply voltage from the local power company.
• Other equipment running on the same line. The compressor may fail to start if any other
electrical devices are drawing from the compressor’s circuit.
• Inadequate wiring to the power source. The input voltage will drop by 20 to 40 volts at
startup if the wiring is not adequate. Inadequate wiring depends on the distance between
the compressor and the 240V power source. As distance increases without a change in wire
gauge (thickness), the power will drop and not enough Volts/Amps will reach the motor.
The wire gauge must increase in size (gauge 8 is larger than gauge 10) to accommodate the
voltage drop. Refer to the Canadian Electrical Code (CE) to determine proper wire size for
your circuit.
GROUNDING INSTRUCTIONS
This product must be connected to a permanent, metallic wiring system or a grounding terminal/
lead on the equipment.
OPERATION
BREAK-IN THE PUMP
NOTICE! The pump is shipped with break–in oil, which should be changed after the first 8 hours
of operation. To reduce maintenance and repair problems, use only a premium compressor oil.
1. Check the level of oil in the pump with the sight glass. The pump oil level must be between A
and B (Fig. 4). Do not overfill or underfill.
2. Make sure the power is connected at the power panel.
3. Turn the pressure switch to the OFF position (A).
4. Open the drain valve (C) by turning it clockwise.
5. Turn ON the main power disconnect switch. Turn the pressure switch to the AUTO position
(B). The motor should start. Allow the compressor to run for 30 minutes, to break in the
internal parts. (Fig. 5)
NOTICE! Shut the compressor down immediately if the unit does not operate properly after 30
minutes and contact Princess Auto Ltd. for a solution.
80 Gallon 2-stage Cast Iron Industrial Air Compressor
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8475014 V 3.4
6. After about 30 minutes, shut o the main power disconnect.
7. Turn the pressure switch to o (A).
8. Close the drain valve (D). Turn it clockwise.
9. Turn ON the main power disconnect switch. Turn the pressure switch to the AUTO position.
The compressor will start and fill the tank to the cut-out pressure and stop.
A
B
Fig.4 Fig.5 Fig.6
PRE-START CHECKLIST
1. Inspect/clean/change intake elements on a regular basis. The ingestion of dirt into the pump
is the primary cause of premature wear. Check intake filters daily.
2. Check oil level daily and change at regular intervals.
3. Check the tension of bolts and hardware on a regular basis. Operation of any equipment with
loose bolts and/or fittings will lead to excessive vibration and the premature failure of the
compressor system control components.
4. Drain moisture from the air tank daily. Water is a natural byproduct of compressed air. Drain
the air tank after each use to avoid internal tank corrosion. Keep drain valves open when not
in use.
DAILY START UP
WARNING! High temperatures are generated by the electric motor and the pump. To prevent
burns or other injuries, DO NOT touch the compressor while it is running. Allow it to cool before
handling or servicing. Keep children away from the compressor at all times.
1. Check the sight glass to ensure the level of oil in the pump is at the required level.
2. Turn the main power disconnect switch to the OFF position.
3. Close the tank drain valve.
4. Turn ON the main power disconnect switch. Turn the pressure switch to the ON position. The
pump will start filling the tank with air. When the air pressure in the tank reaches the level
preset at the factory, the pressure switch will turn o the electric motor. As air is used and
the pressure level in the tank drops, the pressure switch will start the motor and the pump
will begin refilling the tank.
80 Gallon 2-stage Cast Iron Industrial Air Compressor
10 For technical questions call 1-800-665-8685
8475014
V 3.4
SHUTDOWN
1. Turn the pressure switch to the OFF position.
2. Turn the power disconnect switch to the OFF position.
3. Reduce pressure in the tank by slowly opening the drain valve at the bottom of the tank. The
escaping air will also blow condensation out. Leave the drain valve open until the next use.
MAINTENANCE
WARNING! Only qualified service personnel should repair the device. An improperly repaired
device may present a hazard to the user and/or others.
CAUTION! Always unplug or shut down your compressor and drain the air tank completely before
attempting any type of maintenance. Wait for compressor to cool before servicing.
1. Maintain the device with care. A device in good condition is ecient, easier to control and
will have fewer problems.
2. Follow the maintenance schedule for your compressor.
3. Drain tank of moisture after each day’s use. Leave the drain valve open until the next time it
is used. This will allow moisture to completely drain out and help prevent corrosion on the
inside of tank (Fig. 6).
4. Inspect the device fittings, alignment and hoses periodically. Have damaged or worn
components repaired or replaced by an authorized technician.
4.1 Pull the relief valve daily to ensure that it is operating properly and to clear the valve
of any possible obstructions.
4.2 Check that all connections are tight and don’t leak.
5. Maintain the device’s label and name plate. These carry important information. If unreadable
or missing, contact Princess Auto Ltd. for replacements.
MAINTENANCE SCHEDULE
TASK INTERVAL
Check Pump Oil Level Daily or After Each Use
Operate the Pressure Relief Valves Daily or After Each Use
Drain Tank Daily or After Each Use
Inspect and Clean Air Filter Daily or After Each Use
Change Pump Oil Every 200 operating hours or 1 year
Check Belt Tension Every 50 operating hours or monthly
Check and Tighten All Bolts After first 8 hours and every 500 operating hours
Check Operation of System Controls Every 3 months
Check Air tank for Dents/Leaks Every 3 months
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8475014 V 3.4
LUBRICATION
Inspect and lubricate the device when required.
Only use full synthetic, non-detergent air compressor oil to lubricate the pump.
Other lubricants may not be suitable and could damage the device or cause a malfunction
during use.
CHECKING THE OIL
Prior to daily operation, check the oil level in your compressor pump. Check the sight glass to
ensure the level is between A and B. The optimal level is 2/3 full on the sight gauge. Do not
operate the pump with an inadequate or excessive amount of oil.
NOTICE! Use full synthetic, non-detergent air compressor oil.
CHANGING THE OIL
1. Remove the oil plug (C) and drain the
oil until it slows to a drip, then close
(Fig.7).
2. Add oil to the pump by first removing
the breather plug (D).
3. Add compressor oil (approx. 53.26
oz/1.58.litres) until the level viewed
through the sight glass is between FULL
(A) and ADD (B).
4. Replace the breather plug.
Fig.7
80 Gallon 2-stage Cast Iron Industrial Air Compressor
12 For technical questions call 1-800-665-8685
8475014
V 3.4
PULLEY ALIGNMENT
NOTICE! Once the motor pulley is moved from its factory set location, the grooves of the flywheel
and pulley must be aligned to within 1/16 in. to prevent excessive belt wear.
To check pulley alignment, remove the belt guard and place a straightedge (A) against the pump
flywheel (B) (Fig. 10). Measure and record the distance from the straightedge to the edge of the
drive belt at point C. Then measure the distance from the straightedge to the edge of the drive
belt again at points D and E. Both distances should be the same as at point C. If either D or E are
dierent from C, there is a misalignment which must be corrected before the compressor is run.
To correct a pulley misalignment, use the
following procedure.
1. Remove the belt guard with a star
head screwdriver.
2. Loosen the motor mounting bolts.
3. Remove the 2 screws and lock
washers from the hub using a 7/16
in. wrench.
4. Insert the screws into the threaded
holes on the hub and tighten to
pull hub away from sheave,
remove screws.
DRIVE BELT TENSION ADJUSTMENT
Drive belt tensioning and pulley alignment are
done at the same time. They are discussed
separately for clarity.
Proper belt tension and pulley alignment
must be maintained for maximum drive
eciency and belt life. The correct tension
exists if a deflection (A) of 1/2 in. (13 mm)
occurs by placing 10 lb (4.6kg) of force (B)
midway between the motor pulley and the
pump flywheel (Fig. 8). Thisdeflection can
be adjusted by the following procedure. The
pulley should be carefully aligned with the
flywheel and all set screws should be
kept tight.
1. Remove the belt guard by removing the
screws using a star head screwdriver.
2. Loosen the motor mounting bolts.
3. Shift the motor to the point where the correct
deflection exists (A and B).
4. Retighten the motor mounting bolts to 10.8 to
15 ft-lb (14.7 to 20.3 N-m).
5. Check to ensure that the tension
remained correct.
6. Reinstall the belt guard. All moving parts must
be guarded.
Fig.10
Fig.8
Fig.9
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8475014 V 3.4
5. Align the motor pulley with the pump flywheel (C-D-E must be equal).
6. Replace hub by aligning non-threaded holes in hub to holes in sheave. Insert screws and lock
washers and tighten.
7. Adjust the proper belt tension.
8. Retighten the motor mounting bolts to 10.8 to 15 ft-lb (14.7 to 20.3 N-m).
9. Reinstall the belt guard. All moving parts must be guarded
DRIVE BELT REPLACEMENT
1. Remove the front of the belt guard by removing the screws using a star head screwdriver.
2. Loosen the motor mounting bolts.
3. Shift the motor towards the pump to the point where the belts can be easily removed
and installed.
4. Remove and replace belts. The belts must be centered over the grooves on the flywheel and
motor pulley.
5. Shift the motor back to the point where the correct deflection exists (see Drive Belt
Tension Adjustment).
6. Retighten the motor mounting bolts to 10.8 to 15 ft-lb (14.7 to 20.3 N-m).
7. Check to ensure that the tension remained correct.
8. Reinstall the belt guard. All moving parts must be guarded.
TO REPLACE OR CLEAN A CHECK VALVE
1. Shut OFF the main power disconnect. Relieve all the air pressure from the tank (refer to
Shutdown in Operations). Make sure the compressor
has cooled down before servicing.
2. Using the appropriately sized wrench, loosen the
compression nuts (A) on the check valve (B) and
pump head (C). Remove the transfer tube (D).
3. Using the appropriately sized wrench, loosen
the compression nut (F) from the connector (G),
located on the side of the check valve. Remove the
bleedertube (E).
4. Making note of the orientation for reassembly,
unscrew the check valve from the tank
(counterclockwise) using the appropriately
sizedwrench.
5. Using a pencil or screwdriver, carefully push the valve
disc up and down (H). If the valve disc does not move
freely up and down, the check valve needs to be
cleaned or replaced.
6. Clean the check valve with warm soapy water and
make sure to dry thoroughly before reinstalling.If the
disc valve still does not move freely up and down, it will need
to be replaced.
7. Apply thread sealant to the check valve threads and reinstall into the tank by turning
clockwise. Make sure it is the same orientation as when it was removed.
8. Replace the bleeder tube and tighten compression nut.
9. Replace the transfer tube and tighten compression nuts.
10. Perform the Break-in The Pump procedure in Operations to make sure there are no leaks and
the check valve isworking properly.
Fig.11
80 Gallon 2-stage Cast Iron Industrial Air Compressor
14 For technical questions call 1-800-665-8685
8475014
V 3.4
CLEANING THE AIR FILTER
A dirty air filter will reduce the compressor’s performance and
life. To avoid any internal contamination of the pump, the filter
should be cleaned frequently and replaced on a regular basis.
Remove the wing nut (A) and metal cover (B) to access the
filter element (C).
Felt filters should be cleaned in warm, soapy water, rinsed and
allowed to air dry before reinstallation. Paper filters should
be replaced when dirty. Do not allow the filter to become
filled with dirt or paint. Replace the filter if it becomes filled
withpaint.
TESTING FOR LEAKS
Check that all connections are tight. A small leak in any of
the hoses, transfer tubes or pipe connections will substantially reduce the performance of your
air compressor. Locate a leak by spraying a small amount of soapy water around the area of the
suspected leak. Repair or replace the faulty component if bubbles appear. Do not over tighten
any connections.
STORAGE
Before storing the compressor for a prolonged period, use an air blowgun to clean all dust and
debris from the compressor. Turn the power disconnect switch to the OFF position. Open the drain
valve to release all pressure from the tank. This will also drain all moisture from the tank. Clean
the filter element and filter housing; replace the element if necessary. Drain the oil from the pump
crankcase and replace it with new oil. Cover the entire unit to protect it from moisture
and dust.
DISPOSAL
Recycle a device damaged beyond repair at the appropriate facility.
Contact your local municipality for a list of disposal facilities or by-laws for electronic devices,
batteries, oil or other toxic liquids.
IMPORTANT! DO NOT pollute the environment by allowing uncontrolled discharge of waste oil.
TROUBLESHOOTING
Contact Princess Auto Ltd. for a solution if the device does not function properly or parts are
missing. If unable to do so, have a qualified technician service the device.
Problem(s) Possible Cause(s) Suggested Solution(s)
Pump is slow to build
tank pressure.
1. Tank drain valve is open.
2. Loose/slipping belt.
3. Leaks in system.
4. Blown gasket.
5. Broken reed valve.
6. Obstructed intake filter.
7. Leaking regulator.
8. Defective pressure
relief valve.
1. Close drain valve.
2. Adjust belt tension.
3. Correct air leaks.
4. Replace head gaskets.
5. Replace reed valves.
6. Clean or replace
intake element.
7. Replace regulator.
8. Replace pressure relief valve.
Fig.12
80 Gallon 2-stage Cast Iron Industrial Air Compressor
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8475014 V 3.4
Problem(s) Possible Cause(s) Suggested Solution(s)
Excessive oil
consumption.
1. Too much oil
in crankcase.
2. Improper weight of oil.
3. Obstructed
crankcase vent.
4. Dirty/plugged
intake filter.
5. Worn piston rings.
6. Scored cylinder.
1. Drain to proper level.
2. Replace with proper oil.
3. Replace dipstick or oil fill plug/
crankcase vent.
4. Clean/replace intake filter.
5. Contact Princess Auto Ltd.
for solution.
6. Contact Princess Auto Ltd.
for solution.
Low discharge
pressure.
OR
Compressor does
not stop.
1. Tank drain valve is open.
2. Air leaks.
3. Restricted air intake.
4. Prolonged excessive
use of air.
5. Compressor not
large enough.
6. Tank leaks.
7. Blown seals or gaskets.
8. Leaking/worn piston
rings or cylinder.
1. Close drain valve.
2. Tighten or replace leaking fittings or
connections (do not over tighten).
Check air hose. Replace parts
if necessary.
3. Clean or replace air filterelement(s).
4. Decrease amount of air used.
5. Check air requirement of accessory.
If it is higher than CFM and pressure
supplied by compressor, you need a
larger compressor. Most accessories
are rated at 25% of actual CFM while
running continuously.
6. Immediately replace tank. DO NOT
attempt to repair.
7. Replace seals or gasket.
8. Replace piston ring or cylinder.
Air leaks from
regulator.
Or
Regulator does not
regulate pressure.
Dirty or damaged
regulator internal parts.
Replace regulator or internal parts.
Regulated pressure
gauge reading drops
when air accessory is
being used.
1. This is normal.
2. Compressor not
large enough.
1. If pressure drops too low, adjust air
device regulator while accessory
is used.
2. Check air requirement of accessory.
If it is higher than CFM and pressure
supplied by compressor, you need a
larger compressor. Most accessories
are rated at 25% of actual CFM while
running continuously.
Pressure relief
valveopens.
1. Tank pressure
exceeded normal
operating pressure.
2. Pressure switch stuck.
1. Replace pressure switch.
2. Replace pressure switch.
80 Gallon 2-stage Cast Iron Industrial Air Compressor
16 For technical questions call 1-800-665-8685
8475014
V 3.4
Problem(s) Possible Cause(s) Suggested Solution(s)
Motor will not run. 1. Tank pressure exceeds
preset pressure
switch limit.
2. Check valve stuck open.
3. Wrong wire gauge in
power line.
4. Loose electrical
connections.
5. Paint spray on internal
motor parts.
6. Possible
defective motor.
1. Motor will start automatically when
tank pressure drops below cut-in
pressure of pressure tank.
2. Remove and clean or replace.
3. Check for proper gauge for
distance between power source and
compressor.
4. Contact Princess Auto Ltd.
for a solution.
5. Have checked at service center. Do
not operate compressor in the paint
spray area.
6. Contact Princess Auto Ltd.
for a solution.
Excessive current
draw trips circuit
breaker.
1. Low voltage/
motor overload.
2. Drive belt too tight.
3. Restricted air passages.
1. Check that power supply is adequate
and that compressor is on a
dedicated circuit.
2. Readjust belt tension.
3. Inspect and replace transfer tubes or
check valve, as required.
Compressor stalls. 1. Low voltage motor.
2. Bad check valve.
3. Seized pump.
1. Furnish adequate power.
2. Replace the check valve.
3. Contact Princess Auto Ltd.
for a solution.
Compressor pump
knocking.
1. Loose engine pulley or
compressor flywheel.
2. Low oil level in
pump crankcase.
3. Excess carbon on
valves or top of piston.
1. Retighten pulley and flywheel.
Check alignment.
2. Keep oil at proper level at
all times.
3. Contact Princess Auto Ltd.
for a solution.
Oil in discharge air. 1. Worn piston rings
or cylinder.
2. Restricted air intake.
3. Oil level too high.
1. Contact Princess Auto Ltd. for
a solution.
2. Clean or replace the
air filter element(s).
3. Reduce to proper level.
Overheating. 1. Poor ventilation.
2. Dirty cooling surfaces.
3. Restricted air passages.
1. Relocate compressor to an area with
cool, dry, well circulated air, at least 12
in. from nearest wall.
2. Clean all cooling surfaces thoroughly.
3. Replace transfer tubes
and/or unloaded.
Excessive belt wear. 1. Pulley out of alignment.
2. Improper belt tension.
3. Pulley wobbles.
1. Realign pulley with
compressor flywheel.
2. Readjust.
3. Replace the pulley and check for a
damaged crankshaft
or flywheel.
80 Gallon 2-stage Cast Iron Industrial Air Compressor
17
Visit www.princessauto.com for more information
8475014 V 3.4
PARTS BREAKDOWN
Problem(s) Possible Cause(s) Suggested Solution(s)
Compressor
won’t start in cold
temperatures.
1. Too much back pressure
in tank.
2. 40W oil in crankcase.
3. Compressor too cold.
1. Open drain valve when starting motor.
2. Use full synthetic, non-detergent air
compressor oil suitable for
low temperatures.
3. Move compressor to a
warmer location.
Fig. 13
80 Gallon 2-stage Cast Iron Industrial Air Compressor
18 For technical questions call 1-800-665-8685
8475014
V 3.4
PARTS LIST – COMPRESSOR
PART # DESCRIPTION QT Y. PART IDENTIFIER
1 Tank Assy 1 021-0307
1a Drain Valve, 1/4 in. NPT 1 072-0019
1b Bushing, 2 NPSM x 1/4 in. NPT 1 512-0041
1c Bushing, 2 NPSM x 3/4 in. NPT 1 512-0043
1d 2 in. O-ring 2 513-0001
2 Nipple, 1/4 x 2-1/2 in. 1 065-0005
3 Washer, #10 4 060-0146
4 Pump Assy 1 See pages 4-6
5 Screw, 3/8 -16 x 2 in. lg 4 059-0119
6 Washer, 3/8 in. 8 060-0023
7 Nut, 3/8 in. -16 8 058-0009
8 Tube, Bleeder 1 145-0495
9 Elbow 1 064-0003
10 Check Valve 1 031-0104
11 Tube, Transfer 1 145-0670
12 Screw, 3/8 -16 x 1 in. lg 4 059-1007
13 Motor 1 160-0335
14 Key, 1/4 in. Square x 1-1/4 in. lg 1 146-0021
15 Bracket, Belt Guard 2 114-0349
16 Screw M5 x 20 mm 5 061-0255
17 Belt Guard (Inner) 1 125-0219
18 Belt Guard (Outer) 1 125-0204
19 Pulley, 2AK74 1 006-0163
20 V-belt, A68 2 007-0071
21 U-nut, Spring 5 103-0205
22 Screw, 3/8 -16 x 3/4 in. lg 6 059-0164
23 Screw, #10 x 3/4 in. lg 2 061-0212
24 Lock Nut, 10-32 2 058-0158
25 Switch Assy 1 See page 6
26 Magnetic Starter 1 001-0163
27 Bracket 1 114-0849
28 Screw 2 059-0012
29 Strain Relief, 3/8 in. 90° 2 071-0003
30 Cord, Interconnect 1 026-0191
31 Cord, Interconnect 1 026-0223
32 Strain Relief, 3/8 in. Straight 1 071-0002
33 Warning Label 1 098-3870
34 Warning Label 1 098-3031
80 Gallon 2-stage Cast Iron Industrial Air Compressor
19
Visit www.princessauto.com for more information
8475014 V 3.4
PART # DESCRIPTION QT Y. PART IDENTIFIER
35 Connector, 3/4 NPT x 3/4 Tube 1 068-0003
36 Compression Nut & Sleeve 2 058-0012
37 Bushing, 1 x 3/4 in. 1 063-0011
38 Shield 1 125-0224
39 Warning Label 1 098-2896
40 Hub 1 004-0002
41 Screw, 1/4-20 x 3/4 in. 2 N/A (order # 40)
42 Washer 1 to 3/4 in. 1 060-0232
43 Locknut, Conduit 3/4 in. 1 058-0194
44 Washer, 5/16 in. 2 060-0202
45 Nut, 5/16-18 2 058-0125
46 Screw, 5/16-18 2 059-0389
Vibration Pads (Available Separately) 094-0137
Fig. 14
80 Gallon 2-stage Cast Iron Industrial Air Compressor
20 For technical questions call 1-800-665-8685
8475014
V 3.4
PARTS LIST - PUMP ASSEMBLY
PART # DESCRIPTION QT Y. PART IDENTIFIER
1 Filter, Cannister Assy (includes item 2) 1 019-0300
2 Element, Filter Replacement 1 019-0299
3 Bolt, Head, M10 x 100 mm lg 9 059-0421
4 Washer, Lock M10 22 060-0209
5 Head, Cylinder 1 042-0137
6 Gasket, Cylinder Head 1 046-0345
7 Bolt, M5 x 12 mm lg 4 N/A (Order Part #54)
8 Seat, Valve (Upper) 1 N/A (Order Part #54)
9 Gasket, Valve Plate 1 046-0346
10 Reed Valve, LP 4 N/A (Order Part #54)
11 Reed Valve, HP 2 N/A (Order Part #54)
12 Seat, Valve (Lower) 1 N/A (Order Part #54)
13 Gasket, Valve Cylinder 1 046-0347
14 Connector 1 064-0127
15 Compression Nut 1 058-0190
16 Piston, Low Pressure 1 048-0137
17 Pin, Wrist, Low Pressure 1 052-0044
18 Piston, High Pressure 1 048-0138
19 Pin, Wrist, High Pressure 1 052-0045
20 Retaining Ring 4 054-0273
21 Cylinder 1 050-0073
22 Gasket, Cylinder/Crankcase 1 046-0348
23 Nut, M12 6 058-0189
24 Bolt, M12 x 30 mm lg 6 059-0423
25 Rod, Connecting Assy 2 047-0103
26 Connecting Rod 2 N/A (Order Part #25)
27 Insert, Bearing 2 pair 051-0116
28 Needle Bearing 2 051-0115
29 Oil Dipper 2 N/A (Order Part #25)
30 Washer, Spring 2 N/A (Order Part #25)
31 Bolt, M5 x 10 mm lg 2 N/A (Order Part #25)
32 Breather Cap 1 059-0097
33 Connector 1 068-0104
34 Breather Tube 1 065-0113
35 Bolt, M10 x 30 mm lg 6 059-0407
36 Bearing Carrier, Rear 1 045-0056
37 Gasket, Bearing Carrier 1 046-0340
38 Filter, Oil Screen 1 019-0296
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