PROPOINT 8475022 Owner's manual

Brand: PROPOINT

Model: 8475022

Category: Air compressors

Type: Owner's manual

8475022

Please read this manual before use.

V 1.3

120 Gallon 2-stage Cast Iron

Industrial Air Compressor

User Manual

P/N 200-2914-E

2For technical questions call 1-800-665-8685

8475022V 1.3

120 Gallon 2-stage Cast Iron

Industrial Air Compressor

SPECIFICATIONS

Air Delivery 31.3 CFM @ 100 PSI

30.2 CFM @ 175 PSI

Air Tank Capacity 120 Gallons (454 litres)

Max. Air Pressure 175 PSI

Cut-In Pressure 145 PSI

Cut-Out Pressure 175 PSI

Compressor Type Belt Driven, Two Stage

Pump Style Cast Iron, Two-Stage, Oil-lubricated

Oil Capacity

(Approx.)

3.25 quarts (3 litres)

Maximum RPM 850 RPM

Weight 205 lb (93 kg)

Current Rating 25A

Voltage Rating 230

Phase 3 Phase

Noise Rating 82 dB

INTRODUCTION

The 120 Gallon 2-Stage Cast Iron Industrial Stationary Air Compressor is designed for auto

body shops, agricultural operations and industrial applications. Industrial performance

delivers maximum CFM @ 175 PSI, which provides enough power to operate more than one

air tool or device at one time.

The 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. The 230/460 volt (factory wired for 230 volt) industrial class, three phase

electric motor is equipped with a pre-wired and mounted magnetic starter. Uniquely

designed metal belt guard improves compressor pump cooling by as much as 60°F (15°C)

over other belt guard designs. The extra large capacity, 120 gallon tank is ASME certiﬁed.

120 Gallon 2-stage Cast Iron Industrial Air Compressor

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8475022 V 1.3

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,

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.

120 Gallon 2-stage Cast Iron Industrial Air Compressor

4For technical questions call 1-800-665-8685

8475022V 1.3

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.

120 Gallon 2-stage Cast Iron Industrial Air Compressor

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8475022 V 1.3

5.2 Never point the air stream or air 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.

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. 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).

120 Gallon 2-stage Cast Iron Industrial Air Compressor

6For technical questions call 1-800-665-8685

8475022V 1.3

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

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).

Fig. 1

120 Gallon 2-stage Cast Iron Industrial Air Compressor

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8475022 V 1.3

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.

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.

Fig. 2

120 Gallon 2-stage Cast Iron Industrial Air Compressor

8For technical questions call 1-800-665-8685

8475022V 1.3

ASSEMBLY

When this manual refers to a part number, it refers to the included Parts List.

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 sucient 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.

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, wire the air compressor into a dedicated 230V

circuit, as close as possible to the main electrical 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.

MAGNETIC STARTER

The air compressor requires a magnetic starter to prevent motor damage in the event of a

thermal overload.

LOW VOLTAGE PROBLEMS

Low voltage or an overloaded circuit can make it dicult 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 230V power source. As distance increases without

a change in wire gauge (thickness), the power will drop and not enough Volts/Amps

120 Gallon 2-stage Cast Iron Industrial Air Compressor

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8475022 V 1.3

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. 3). 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 counterclockwise.

5. Turn ON the main power disconnect switch. Turn the pressure switch to the ON

position (B). The motor should start. Allow the compressor to run for 30 minutes,

to break in the internal parts. (Fig. 4)

NOTICE! Shut the compressor down immediately if the unit does not operate

properly after 30 minutes and contact Princess Auto Ltd. for a solution.

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. The compressor is ready for use.

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.

Fig. 3 Fig. 4 Fig. 5

120 Gallon 2-stage Cast Iron Industrial Air Compressor

10 For technical questions call 1-800-665-8685

8475022V 1.3

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.

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 ecient, 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. 4).

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.

120 Gallon 2-stage Cast Iron Industrial Air Compressor

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8475022 V 1.3

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

Check Belt Tension Every 250 operating hours

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

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. 6).

2. Add oil to the pump by ﬁrst removing the breather plug (D).

3. Add compressor oil (approx. 104 ﬂ. oz/3 litres) until the level viewed through the

sight glass is between FULL (A) and ADD (B).

4. Replace the breather plug.

120 Gallon 2-stage Cast Iron Industrial Air Compressor

12 For technical questions call 1-800-665-8685

8475022V 1.3

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 eciency

and belt life. The correct tension exists if a deﬂection (A) of 1/2 in. (13 mm) occurs by

placing 10 lb (4.6 kg) of force (B) midway between the motor pulley and the pump

ﬂywheel (Fig. 7). This deﬂection 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 and washers 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.

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. 8). 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 dierent 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.

Fig. 7

120 Gallon 2-stage Cast Iron Industrial Air Compressor

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8475022 V 1.3

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 and washers 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 bleeder tube (E).

4. Making note of the orientation for reassembly, unscrew the check valve from the tank

(counterclockwise) using the appropriately sized wrench.

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.

Fig. 8

120 Gallon 2-stage Cast Iron Industrial Air Compressor

14 For technical questions call 1-800-665-8685

8475022V 1.3

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 is working properly.

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 with paint.

Fig. 11

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.

Fig. 9

Fig. 10

Fig. 9

120 Gallon 2-stage Cast Iron Industrial Air Compressor

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8475022 V 1.3

STORAGE

Before storing the compressor for a prolonged period, use an air blowgun to clean all dust

and debris from the compressor. Disconnect the power cord and coil it up on the handle.

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.

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.

120 Gallon 2-stage Cast Iron Industrial Air Compressor

16 For technical questions call 1-800-665-8685

8475022V 1.3

Problem(s) Possible Cause(s) Suggested Solution(s)

Low discharge

pressure.

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 ﬁlter element(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.

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

tool 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

valve opens.

1. Tank pressure

exceeded normal

operating pressure.

2. Pressure switch stuck.

1. Replace pressure switch.

2. Replace pressure switch.

120 Gallon 2-stage Cast Iron Industrial Air Compressor

Visit www.princessauto.com for more information

8475022 V 1.3

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

wand 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.

120 Gallon 2-stage Cast Iron Industrial Air Compressor

18 For technical questions call 1-800-665-8685

8475022V 1.3

Problem(s) Possible Cause(s) Suggested Solution(s)

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.

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.

120 Gallon 2-stage Cast Iron Industrial Air Compressor

Visit www.princessauto.com for more information

8475022 V 1.3

PARTS BREAKDOWN

120 Gallon 2-stage Cast Iron Industrial Air Compressor

20 For technical questions call 1-800-665-8685

8475022V 1.3

PARTS LIST – COMPRESSOR

PART # DESCRIPTION QTY. PART IDENTIFIER

1 Screw, #10-14 x 3/4 in. 1 061-0152

2 Washer, #10 5 060-0146

3 U-nut, Spring M5 x 0.8 7 103-0205

4 Belt Guard (outer) 1 125-0226

5 Screw, 1/4 x 3/4 in. lg 2 N/A (Order item #7)

6 Key 5/16 x 3/16 x 1 1/4 in. lg 1 146-0007

7 Hub (includes item 5) 1 004-0002

8 Pulley 1 006-0161

9 V-belt, B64 2 008-0040

10 Belt Guard (inner) 1 125-0217

11 Screw, #10-32 x 3/4 in. 2 061-0212

12 Nut, 10-32 2 058-0158

13 Reducer Coupling, 1 x 3/4 in. 1 063-0045

14 Bracket, Belt Guard 2 114-0349

15 Bolt, Lock 3/8-16 x 3/4 in. lg 6059-0164

16 Washer, 3/8 in. 12 060-0023

17 Switch, Pressure (includes items 19 & 22 to 23) 1 034-0199

18 Gauge, 300 PSI 1 032-0025

19 Valve, Bleeder 1 136-0090

20 Nipple, 1/4 in. NPT x 2 1/2 in. lg 1 065-0005

21 Valve, Relief, 200 PSI 1 136-0007

22 Strain Relief 1 071-0033

23 Screw 1 061-0216

24 Motor, 230V 1 160-0347

25 Cord, Interconnect 10/4 (to motor) 1 026-0189

26 Cord, Interconnect 14/3 (to switch) 1 026-0223

27 Bolt, 3/8 x 1 in. lg 4 059-1007

28 Nut, 3/8 in. 4 058-0009

29 Label, Warning 1 098-3031

30 Label, Warning 1 098-3870

31 Tank Assembly (includes items 32-35) 1 515-0358

32 O-ring 2 in. 2 513-0001

33 Bushing, 2 NPSM x 3/4 in. NPT 1 512-0043

34 Bushing, 2 NPSM x 1/4 in. NPT 1 512-0041

35 Petcock, 1/4 in. NPT 1 072-0019

36 Bracket 1 114-0849

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PROPOINT 8475022 Owner's manual

Brand: PROPOINT

Model: 8475022

Category: Air compressors

Type: Owner's manual

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PROPOINT 8475022 Owner's manual

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