Power Fist 8474959 User manual

V0.1 8474959
Please read and understand all instructions before use. Retain this manual for
future reference.
P/N 200
-2696

8474959 3 Gallon Portable Air Compressor V0.1
2 For technical questions call 1-800-665-8685
SPECIFICATIONS
Air Delivery 2.0 CFM @ 90 PSI
3.0 CFM @ 40 PSI
Air Tank Capacity 3 Gallons (11.4 litres)
Max. Air Pressure 125 PSI
Cut-In Pressure 95 PSI
Cut-Out Pressure 125 PSI
Compressor Type Direct Drive, Single Stage
Pump Style Oil Free
Current Rating 12A
Voltage Rating 120V, 60Hz
Duty Cycle 50%
Noise Rating 82 dB
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.

V0.1 3 Gallon Portable Air Compressor 8474959
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INTRODUCTION
This portable air compressor is ideal for light duty pneumatic tool
applications and general household use.
SAFETY
WARNING! Read and understand all instructions before using this tool. 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.
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 the device properly in a safe and dry location. Keep 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).
PERSONAL PROTECTIVE EQUIPMENT
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.
a. 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.

8474959 3 Gallon Portable Air Compressor V0.1
4 For technical questions call 1-800-665-8685
PERSONAL PRECAUTIONS
Control the tool, personal movement and the work environment to avoid
personal injury or damage to tool.
1. Do not operate any tool when tired or under the influence of drugs,
alcohol or medications.
2. Avoid wearing clothes or jewelry that can become entangled with the
moving parts of a tool. Keep long hair covered or bound.
3. Do not overreach when operating a tool. Proper footing and balance
enables better control in unexpected situations.
SPECIFIC SAFETY PRECAUTIONS
WARNING! DO NOT let comfort or familiarity with product (gained from
repeated use) replace strict adherence to the tool safety rules. If you use
this tool unsafely or incorrectly, you can suffer serious personal injury.
1. Use the correct tool for the job. This tool was designed for a specific function.
Do not modify or alter this tool or use it for an unintended purpose.
2. Do not use the tool if any parts are damage broken or misplaced. Repair
or replace the parts.
3. Risk of Bursting
a. 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.
b. 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.
c. 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.

V0.1 3 Gallon Portable Air Compressor 8474959
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4. Risk of Explosion or Fire
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.
5. 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.
6. Risk from Moving Parts
a. 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.
b. This unit starts automatically. Always shut off the compressor and
bleed all pressure from the system before servicing the
compressor and when the compressor is not in use.
7. Risk of Damage to Air Compressor or Property
a. 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.
b. Do not operate without an air filter or in a corrosive environment.
c. 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.
d. In cold climates, drain the tank after each use to avoid ice build
up.

8474959 3 Gallon Portable Air Compressor V0.1
6 For technical questions call 1-800-665-8685
GENERAL SAFETY PRECAUTIONS
ELECTRICAL SAFETY
WARNING! To reduce risk of electric shock, be certain that the plug is
connected to a properly grounded receptacle.
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. Do not disconnect the power cord in place of using the AUTO/OFF
switch on the device. This will prevent an accidental startup when the
power cord is plugged into the power supply.
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 the 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. Use time delay fuses with this product when the circuit is connected to
a fuse box.
8. 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).
9. DO NOT use this device with a 2-prong wall receptacle.
a. Choose an available 3-prong power outlet.
b. Replace 2 prong outlet with a grounded 3-prong receptacle,
installed in accordance with the CE Code and local codes and
ordinances.
POWER CORD
1. Insert the power cord plug directly to the power supply whenever
possible. Use extension cords or surge protectors only when the
device's power cord cannot reach a power supply from the work area
(see below).

V0.1 3 Gallon Portable Air Compressor 8474959
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a. If an extension cord must be used, ensure it is at most 50 ft long
and at least 12 gauge wire thickness.
2. Do not operate this device if the power cord is frayed or damaged as an
electric shock may occur, resulting in personal injury or property
damage.
a. Inspect the device's power cord for cracks, fraying or other faults
in the insulation or plug before each use.
b. Discontinue use if a power cord feels more than comfortably
warm while operating the device.
c. Have the power cord replaced by a qualified service technician
3. Keep all connections dry and off the ground to reduce the risk of
electric shock. Do not touch plug with wet hands.
4. Prevent damage to the power cord by observing the following:
a. Do not pull on the cord to disconnect the plug from an outlet.
b. Keep cord away from heat, oil, sharp edges or moving parts.
5. Do not allow people, mobile equipment or vehicles to pass over
unprotected power cords.
a. Position power cords away from traffic areas.
b. Place cords in reinforced conduits.
c. Place planks on either side of the power cord to create a
protective trench.
UNPACKING
WARNING! Do not operate the tool 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 contents are included.
Contents:
• Air compressor
• 25 ft PE coil hose
• Blow gun with safety nozzle
• Inflation needle and adapter fitting
• Dual head tire chuck
• 1/4 in. female Quick coupler
• 1/4 in. NPT male and female QC
plugs
• Thread tape

8474959 3 Gallon Portable Air Compressor V0.1
8 For technical questions call 1-800-665-8685
BASIC AIR COMPRESSOR COMPONENTS
Oil free air compressors are factory lubricated for life and do not require
any oil.
The basic components of the air compressor are the electric motor, pump,
pressure switch and tank.
The electric motor (A) powers the pump. The electric motor is equipped with
an overload protector and an automatic reset. If the motor becomes
overheated, the overload protector will shut it down to prevent damage to
the motor. When the motor sufficiently cools, it will automatically reset.
The pump (A) compresses the air and discharges it into the tank.
The tank (B) stores the compressed air.
The pressure switch (C) shuts down the
motor 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.
COMPRESSOR CONTROLS
A. AUTO/OFF SWITCH
This switch turns on the compressor. It is operated manually, but when in
the ON position, it allows the compressor to start up or shut down
automatically, without warning, upon air demand. ALWAYS set this switch to
OFF when the compressor is not being used,
and before unplugging the compressor.
B. PRESSURE RELIEF VALVE
The air compressor is equipped with a
pressure relief valve that is designed to
discharge tank pressure at a predetermined
setting when a systems failure occurs.
Check the pressure relief valve periodically
by pulling on the ring only when the tank
pressure is completely drained. The spring
loaded valve should move freely within the
pressure relief valve body. An inoperable
Fig
. 1
Fig
. 2

V0.1 3 Gallon Portable Air Compressor 8474959
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pressure relief valve could allow an excessive amount of tank pressure to
build causing the air tank to catastrophically rupture or explode. Do not
tamper with or attempt to eliminate the pressure relief valve.
C. 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.
D. AIR PRESSURE REGULATOR
This air pressure regulator enables you to adjust line pressure to the tool
you are using. Turn the knob clockwise to increase pressure, and
counterclockwise to decrease pressure.
E. REGULATED PRESSURE GAUGE
This gauge measures the regulated outlet pressure.
F. AIR LINE OUTLET
Connect an air hose to this outlet.
ASSEMBLY & INSTALLATION
Letter references in parenthesis (A) refer to the included Identification Key.
This unit is preassembled.
LOCATION INSTALLATION
Locate the compressor according to the following guidelines:
1. Position the compressor near a grounded electrical outlet. Avoid using
an extension cord; use a longer hose instead.
2. The flywheel side of the compressor must be at least 12 inches (30 cm)
from any wall or obstruction, in a clean, well-ventilated area, to ensure
sufficient 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.
OPERATION
PRE-START CHECKLIST
1. Always operate the compressor in a level position to allow the tank to drain.

8474959 3 Gallon Portable Air Compressor V0.1
10 For technical questions call 1-800-665-8685
2. 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.
3. Check 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 by-product of
compressed air. Drain the air tank after each use to combat internal
tank corrosion. Keep drain valves open if storing compressor for any
length of time.
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.
WARNING! When adjusting from a higher to a lower
pressure, turn the knob anticlockwise past the desired
setting, then turn clockwise to reach the desired
pressure. Do not exceed operating pressure of the tool
or accessory being used.
1. Turn the pressure switch to the OFF position (A).
(Fig. 3)
2. Close the tank drain valve (D). (Fig. 4)
3. Plug in the power cord.
4. Turn the pressure switch to the
AUTO position (C).
5. Adjust the air pressure regulator to
the working pressure of the tool
being used.
SHUTDOWN
1. Turn the pressure switch to the OFF position (A).
2. Unplug the power cord.
3. Reduce pressure in the tank by slowly opening the drain valve at the
bottom of the tank (B). The escaping air will also blow condensation out.
Leave the drain valve open until the next use.
Fig
. 3
Fig
. 4

V0.1 3 Gallon Portable Air Compressor 8474959
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CARE & MAINTENANCE
WARNING! Only qualified service personnel should repair the tool. An
improperly repaired tool 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 efficient,
easier to control and will have fewer problems.
2. Inspect the device components periodically. Repair or replace damaged
or worn components.
3. Follow instructions for lubricating and changing accessories.
4. Drain tank of moisture after each day’s use. If unit will not be used for a
while, it is best to leave drain valve open until such time as it is to be
used. This will allow moisture to completely drain out and help prevent
corrosion on the inside of tank (Fig. 4).
5. Inspect the device fittings, alignment and hoses periodically. Have
damaged or worn components repaired or replaced by an authorized
technician.
a. Pull the pressure relief valve daily to ensure that it is operating
properly and to clear the valve of any possible obstructions.
b. Check that all connections are tight and don’t leak.
6. Maintain the device’s label and nameplate. These carry important
information. If unreadable or missing, contact Princess Auto Ltd. for
replacements.

8474959 3 Gallon Portable Air Compressor V0.1
12 For technical questions call 1-800-665-8685
MAINTENANCE SCHEDULE
Recommendation Daily Weekly Monthly Quarterly Annually
Drain Moisture from
Tank(s)
X
Inspect Filter(s) X
Check for Unusual Noise
or Vibration
X
Check for Air Leaks X
Clean Exterior of Air
Compressor
X
Tighten/Retorque Bolts X
Check Operation of
Pressure Relief Valve
X
Clean/Change Filter X
Perform Pump Up Time
Test
X
Check Operation of
System Controls
X
Check Air Tank(s) for
Dents/Leaks
X
Inspect Tank for Rust,
Pinholes, or other
Imperfections.
X
LUBRICATION
The oil free air compressor is factory lubricated for life and does not require
any oil for the pump.
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.

V0.1 3 Gallon Portable Air Compressor 8474959
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DISPOSAL
Recycle a tool damaged beyond repair at the appropriate facility.
TROUBLESHOOTING
Visit a Princess Auto Ltd. location for a solution if the tool does not function
properly or parts are missing. If unable to do so, have a qualified technician
service the tool.
Problem(s) Possible Cause(s) Suggested Solution(s)
Low pressure
or not enough
air or
compressor
does not stop.
1. Tank drain valve is
open.
2. Fittings leak.
3. Restricted air intake.
4. Prolonged excessive
use of air.
5. Compressor not large
enough.
6. Hole in air hose.
7. Tank leaks.
8. Blown seals.
9. Valve leaks.
10. Leaking or worn
piston.
1. Close drain valve.
2. Check fittings with soapy water.
Tighten or reseal leaking fittings. DO
NOT OVERTIGHTEN.
3. Clean or replace intake filter element.
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. Check and replace if necessary.
7. Immediately replace tank. DO NOT
attempt to repair.
8. Replace seals.
9. Replace valve.
10. Replace piston.
Air leaks from
regulator or
regulator does
not regulate
pressure.
Dirty or damaged
regulator internal parts.
Dirty or damaged regulator 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
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.

8474959 3 Gallon Portable Air Compressor V0.1
14 For technical questions call 1-800-665-8685
Pressure relief
valve opens.
1. Tank pressure
exceeded normal
operating pressure.
2. Pressure switch stuck.
1. Replace pressure switch.
2. Replace pressure switch.
Motor will not
run.
1. Tank pressure exceeds
preset pressure switch
limit.
2. Fuse blown or circuit
breaker tripped (make
sure the thermal
overload switch has
not tripped. The motor
has a built-in thermal
cut-out that trips to
protect the motor
from damagedue to
overheating).
3. Check valve stuck
open.
4. Extension cord is too
long, too light gauge
or damaged.
5. Loose electrical
connections.
6. Paint spray on internal
motor parts.
7. Possible defective
motor.
1. Motor will start automatically when
tank pressure drops below the cut-in
pressure of pressure tank.
2. Replace blown fuse or reset circuit
breaker. Do not use fuse or circuit
breaker with higher rating than
specified for your branch circuit. To
reset the motor overload, turn the
pressure switch AUTO/OFF lever to
the OFF position and unplug the unit
from the power outlet. Allow 10
minutes minimum for motor overload
cut-out to cool and reset. Unit can
then be plugged in and re-started.
2a. Check for proper fuse. A fuse
type T, such as a Fusetron, is
acceptable.
2b. Check for low voltage and
proper extension cord size.
2c. Disconnect other applications
from circuit. Operate compressor
on a dedicated circuit.
3. Remove and clean or replace.
4. Replace extension cord with another
one that is at most 50 ft long and at
least 12 gauge.
5. Contact Princess Auto Ltd. for a
solution.
6. Do not operate compressor in the
paint spray area. Contact Princess
Auto Ltd. for a solution.
7. Contact Princess Auto Ltd. for a
solution.

V0.1 3 Gallon Portable Air Compressor 8474959
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PARTS BREAKDOWN
PARTS LIST - MOTOR
# DESCRIPTION QTY KIT PART ID
1 Screw, SHC M6 x 1.0 x 30 mm 4
2
Washer, Lock M6
4
3 Head, Cylinder 1 E100227
4
Gasket, Head
1
1&2
5 Plate, Valve 2 1
6
Valve, Reed
2
1
7 Gasket, Valve Plate 1 1&2
8
Gasket, Cylinder
1
1&2
9 Cylinder 1 1
10
Assembly, Piston F1
1
1
11 Fan, Pump 1 E100776
12
Washer, Flat M5
1
13 Screw, SHC M5 x 0.7 x 14 mm 1
14
Assy, Eccentric Screw & Bearing 6202
1
3

8474959 3 Gallon Portable Air Compressor V0.1
16 For technical questions call 1-800-665-8685
15
Assy, Motor/Pump Housing F1
1
16
Fan, Motor Cooling
1
E100860
17
Ring, Retainer, 15 mm
1
18
Capacitor, Running (Motor-40μF/250VAC)
1
E104277
19
Cover, Capacitor (Metal)
2
E101561
20
Capacitor, Starting (Motor-200μF/125VAC)
1
E104276
21
Screw, PH M3 x 0.5 x 6 mm
4
22 to 25
---
PARTS LIST - COMPRESSOR
# DESCRIPTION QTY KIT PART ID
26
Base, Air Filter
1
4
27
Element, Air Filter
1
4
E100435

V0.1 3 Gallon Portable Air Compressor 8474959
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28
Cap, Air Filter
1
4
29
Shroud, F1 Pump (Mini)
1
E101716
30
Screw, PH M4 x 0.7 x 8 mm w/ Captured Lock Washer
5
31
Shroud, Rear Motor
1
E101562
32
Assy, F1 Pump/ Motor
5
33
Cord, Power, 16/3 AWG, Length 6 ft Type ST
1
E101340
34
Restraint, 16/3 AWG ST Power Cord
1
E101802
35
Gauge, Pressure 1-1/2 in.
2
E103339
36
Switch, Pressure 125 PSI
1
E100957
37
Valve, Pressure Relief
1
E102595
38
Nipple, 1/4 in. MNPT x 35 mm
1
E100853
39
Nipple, 1/4 in. MNPT x 27 mm
1
E100595
40
Regulator, 1/4 in. FNPT Left Flow (Black)
1
E100971
41
Coupling, Quick Connect 1/4 in. MNPT
1
E102822
42
Assy, Tank Weldment
2
43
Isolator
4
E104310
44
Washer, Flat M8
4
45
Screw, HH M8 x 1.25 x 25 mm Self Tapping
4
46
Valve, Drain Multi-Turn
2
E100098
47
Valve, Check, 90 Degree Right
2
E100898
48
Ferrell, 3/8 in. Comp.
2
6
49
Nut, 3/8 in. Comp.
2
6
50
Assy, Finned Outlet Tube, 3/8 in. Comp.
1
6
51
Fitting, Elbow 3/8 in. MNPT x 3/8 in. Comp.
2
E101207
52
Grip, Slide on 20 mm
2
E100097
53
Screw, SHC M8 x 1.25 x 16 mm
2
54
Washer, Lock M8
2
55
Washer, Flat M8
1
56
Nut, M8 x 1.25
1
57
Nut, 1/4 in. Comp.
1
7
58
Ferrel, 1/4 in. Comp.
1
7
59
Tube, 1/4 in. Pressure Relief (Formed)
1
7

8474959 3 Gallon Portable Air Compressor V0.1
18 For technical questions call 1-800-665-8685
PARTS LIST - KIT
KIT # KIT NAME PART # ORDER #
1 Kit, Pump Rebuild 4-10 E105013
2 Kit, Gasket 4,7-8 E101719
3 Kit, Eccentric 14 E104743
4 Kit, Air Filter 26-28 E100794
5 Kit, F1B2 Small Pump Fan w/ Right Outlet 1-21, 32 E103362
6 Kit, 3/8 in. Outlet Tube Finned 48-50 E104596
7 Kit, 1/4 in. Pressure Relief Tube 57-59 E104595

V0.1 3 Gallon Portable Air Compressor 8474959
Visit www.princessauto.com for more information 19

8474959 3 Gallon Portable Air Compressor V0.1
20 For technical questions call 1-800-665-8685