MasterCraft Maximum User manual

INSTRUCTION MANUAL
058-9308-0

Quick Start Guide
If any parts are
missing or damaged,
or if you have any
questions, please call
1-800-689-9928.
Read and understand this instruction manual
thoroughly before using the product. It contains
important information for your safety as well as
operating and maintenance advice.
Keep this instruction manual for future use. Should
this product be passed on to a third party, then this
instruction manual must be included.
5 U.S. GALLONS (18.9 L) ·150 PSI (MAX) AIR COMPRESSOR 058-9308-0

QUICK START GUIDE
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
STEP 1
Place the compressor (1) on a flat, even,
concrete floor surface or separate concrete
foundation. Locate the compressor near a
grounded electrical outlet (2).
page 13, steps 1-2
STEP 2
Make sure the drain valves at the bottom of
the tanks are closed. Connect the air hose (1)
to the air line outlet (2) and the air
tool (3). page 16, steps 1-2
MC-589308-03
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STEP 3
Plug the power cord (1) into the electrical
outlet. Turn the ON/OFF switch (2) to the AUTO
position. Let the motor run.
page 16, steps 3-4
STEP 4
Turn the pressure regulator knob (1) clockwise
to adjust the hose pressure with respect to the
air tool. page 16, step 5
0
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TABLE OF CONTENTS
2
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
QUICK START GUIDE
TECHNICAL SPECIFICATIONS 3
SAFETY GUIDELINES 4–9
KEY PARTS DIAGRAM 10
IMPORTANT INFORMATION 11–12
ASSEMBLY INSTRUCTIONS 13
OPERATING INSTRUCTIONS 14–17
MAINTENANCE 18–20
TROUBLESHOOTING 21–22
EXPLODED VIEW 23
PARTS LIST 24
WARRANTY 25–26

TECHNICAL SPECIFICATIONS
3
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
*CFM: Cubic feet per minute
**PSI: Pounds per square inch
RUNNING HORSEPOWER 2
POWER 120 V, 60 Hz, 12 A
COMPRESSOR TYPE Oil-less
TANK TYPE Black twin tank
TANK SIZE 5 U.S. gallons (18.9 L)
MOTOR Induction
CUT-IN PRESSURE 120 PSI (8.27 bar)
CUT-OFF PRESSURE 150 PSI (10.34 bar)
AIR DELIVERY 5 CFM* @ 40 PSI**
4 CFM* @ 90 PSI**
WEIGHT 52 lb (23.6 kg)

SAFETY GUIDELINES
4
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
Safety guidelines
This manual contains information that relates to PROTECTING PERSONAL SAFETY and PREVENTING
EQUIPMENT PROBLEMS. It is very important to read this manual carefully and understand it
thoroughly before using the product. The symbols listed below are used to indicate this information.
Note: The word “Note” is used to inform the
reader of something the user needs to know
about the tool.
SAFETY RECOMMENDATIONS
These precautions are intended for the personal safety of the user and others working with the user.
Failure to follow these instructions may result in a permanent loss of vision, serious personal, or
even fatal, injury, property damage, and/or tool damage. Please take the time to read and
understand them.
DANGER!
Potential hazard that will result in serious
injury or loss of life.
WARNING!
Potential hazard that could result in
serious injury or loss of life.
CAUTION!
Potential hazard that may result in
moderate injury or damage to equipment.

SAFETY GUIDELINES
5
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
DANGER!
Potential hazard that will result in serious injury or loss of life.
•Keep bystanders, children and visitors away from the work area while
operating the compressor. Do not allow children to handle the compressor.
Distractions can affect the control of the compressor.
•Never point any nozzle or sprayer toward yourself, other people or animals.
Fast moving air may spread dust and debris which are harmful. Always
release air slowly when draining tank or depressurizing the compressor
system.
•Always shut OFF the compressor, remove the power plug from the electrical
outlet, and release all pressure from the air system, before attempting to
install, service, relocate, or perform any maintenance on the compressor.
•Never use plastic PVC pipe with the compressor. Failure to comply will result
in serious personal injury or death.
•Do not operate the compressor if the power cord or plug is damaged. Have
the cord or plug serviced at a qualified service centre.
•Follow all local electrical and safety codes.
Risk of burns: To prevent burns or other injuries, do not touch the
compressor while operating. Once stopped, allow it to cool before touching.
The compressor parts may be hot even if it is stopped.
•Motor, electrical equipment and control can produce an
electrical spark that will ignite a flammable gas or
vapour. Never use the compressor in a combustible
environment or in the presence of combustible materials,
such as flammable chemicals, adhesives, gasoline or
solvents, as the internal combustion produces hot exhaust
gases that may ignite flammable materials. Failure to
observe this warning can cause explosion and serious
personal injury or death.
Oxygen
Hydrogen
Explosive
Combustible
MC-OM-02

SAFETY GUIDELINES
6
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
•Risk of electric shock: Do not expose the compressor to rain or wet
conditions. Store it indoors. Make sure the power supply outlet and
grounding wire are grounded properly. Keep the power cord away from heat,
oil, sharp edges, moving parts, chemical spills, solvents and wet floors.
•Risk of bursting: Make sure the safety relief valve installed in the tank
complies with ASME code and has a setting not higher than maximum
working pressure. Never attempt to adjust the safety relief valve. Keep the
valve free from paint and other accumulations.
•Risk of fire or explosion: Always operate the compressor in a well-ventilated
area. Do not smoke while spraying paint or insecticides. Never spray
flammable liquids near ignition sources or in a confined area or the area
where spark or flame is present. Keep the compressor as far as possible
from the spraying area and all flammable materials.
• Never attempt to repair or modify the air tank, as doing so may damage the
tank, resulting in an explosion. Always replace the tank if it is worn, cracked,
or damaged.
•Risk of inhalation: Do not use the compressor to spray chemicals, as doing
so may affect your lungs by inhaling toxic fumes. Use a respirator in dusty
environment or when spraying paints.
WARNING!
Potential hazard that could result in serious injury or loss of life.
•Do not allow inexperienced or untrained individuals to operate the
compressor.
•Stay alert and use caution when operating the compressor. Do not use the
compressor when you are tired or under the influence of drugs, alcohol or
medication.
•Never leave the compressor unattended. Failure to comply will result in fire
or serious personal injury.
•Do not stand on the compressor.
•Make sure all fasteners of the compressor are tightened securely in proper
place.

SAFETY GUIDELINES
7
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
CAUTION!
Potential hazard that may result in moderate injury or damage to
equipment.
•Do not wear watches, rings, bracelets or loose clothing when using the
compressor. Keep your hair, clothing and gloves away from moving parts.
•Use the compressor only for its intended purpose. Do not alter or modify the
compressor from its original design or function.
• Always operate the compressor in a stable, secure position to prevent
accidental movement.
•Do not misuse the power cord. Never use the cord to carry the compressor.
Always use grip handle to move it. Remove the power plug from the power
supply outlet after use.
•Drain out the moisture from the air tank on a regular basis to prevent
corrosion of the tank. Inspect the tank periodically.
•Make sure the compressor vibrates normally during operation. If not, stop
the compressor and immediately find the cause of the vibration.
•Keep the compressor and the work area clean and well lit. A cluttered or
dirty workplace may lead to an accident. Floors should be kept clear.
•Protect the air hose and electric cord from damage and puncture. Inspect
them weekly for weak or worn spots, and replace them if necessary.
•Use safety glasses and ear protection.
Wear safety glasses with side shields when operating the
tool and verify that others in the work area are also wearing
safety glasses. Safety glasses must conform to American
National Standards Institute (ANSI Z87.1) requirements and
must provide protection from flying particles from the front
and the sides.
The compressor is loud, and the sound can cause hearing
damage. Always wear ear protection to help prevent hearing
damage and loss. Failure to comply may result in moderate
injury.
MC-OM-01

SAFETY GUIDELINES
8
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
SAFETY INSTRUCTIONS FOR USING THE AIR TOOL
•The air tool is not a toy. Careless and improper use of the air tool may result in a serious
accident.
•Never leave or store the tool with the air hose attached to avoid accidental starting of the tool
and serious personal injury.
•Protect the air hose from damage or puncture. Keep the air hose away from sharp objects,
chemical spills, oil, solvents and wet floors.
•Make sure the air hose is free of obstructions or snags. Entangled or snarled hoses can cause
loss of balance or footing, and may become damaged.
•Inspect the power cord of the air tool and air hose before each use. Ensure that all
connections are proper. Do not use the damaged hose. Have a qualified electrician repair or
replace the damaged part.
•Stay alert and use proper sense when operating the tool. Do not use the tool when you are
tired or under the influence of drugs, alcohol or medication.
•Do not overreach. Keep proper footing and balance at all times to enable better control of the
tool in unexpected situations.
• For personal safety, use an extension cord marked as “W-A” or “W” while operating the tool
outdoors.
•Maintain the tool with care.
• Make sure the tool is serviced only by a qualified technician.
• Store idle tools out of reach of children and other untrained people.
• Always wear eye protection when using the air tool. If required, use a dust mask, non-skid
safety footwear, a hard hat or hearing protection.

SAFETY GUIDELINES
9
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
ELECTRICAL SAFETY
Grounding instructions: In the event of a
malfunction or breakdown, grounding provides
the path of least resistance for electrical
current in order to reduce the risk of electric
shock. This tool is equipped with an electric
cord that has a grounding wire and a
grounding plug (1). The plug must be plugged
into a matching power supply outlet (2) that is
properly installed and grounded in accordance
with all local codes and ordinances, or a
grounded wall socket, for optimum
performance. The grounding plug has two
flat-blade terminals and a grounding pin.
If the grounding plug does not fit into the outlet, do not try to modify it. Have a qualified electrician
repair the proper outlet.
If the compressor's electrical cord requires repair or replacement, have this done by an authorized,
qualified service technician.
Guidelines for using extension cords
Note: Do not use the extension cord unless it is necessary. It is better to use a longer air hose that
reaches the work area where air is needed.
• Use only a three-wired extension cord that has a three-prong grounding plug that fits into a
three-slot receptacle.
• Ensure the extension cord is properly wired and in good electrical condition. Always replace a
damaged extension cord immediately or have it repaired by a qualified technician.
• Protect the extension cords from sharp objects, excess heat and damp or wet areas.
• Using extension cords with inadequately sized wires will cause a serious drop in voltage,
resulting in loss of power and tool damage. The smaller the gauge number, the heavier the
extension cord. If in doubt, select the next heavier gauge.
Note: Recycle unwanted materials rather than disposing of them as waste. When the tool is no
longer of use, sort the tool and its components in specific categories and take to the local recycling
center or dispose of them in an environmentally safe way.
MC-589308-01
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KEY PARTS DIAGRAM
10
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
No. Description No. Description
1 Motor 8 Power cord
2 Air filter 9 Check valve
3 Air tank 10 Air line outlet
4 Drain valve 11 Safety relief valve
5 Outlet pressure gauge 12 ON/OFF switch
6 Pressure regulator knob 13 Grip handle
7 Tank pressure gauge
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MC-589308-02
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IMPORTANT INFORMATION
11
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
General use
This Mastercraft Maximum®5 U.S. Gallons (18.9 L) Air Compressor is designed to provide compressed
air to power air tools. This compressor is provided with an ON/OFF switch, an air tank and a motor with
automatic reset thermal overload protector.
Air compressor components
Air filter
The filter is attached to the compressor cylinder head for removing impurities from the air intake of
the compressor.
Air tanks
These air tanks are cylindrical components that are used to store the compressed air.
Check valve
This valve is an one-way valve that is connected between the air tank and pressure transfer tube to
prevent backflow of compressed air from the air tank to the compressor pump.
Drain valves
These valves are located at the bottom of the air tanks to drain moisture from the tank.
Pressure regulator knob
The knob can be adjusted to regulate the pressure at the air line outlet of the compressor. Turn the
knob clockwise to increase pressure and counter-clockwise to decrease pressure.
ON/OFF switch
This switch is operated manually to turn ON or OFF the compressor. When switch is in the AUTO
position, the compressor shuts down or starts up automatically based on air pressure level in the air
tank. Always set this switch to OFF position when the compressor is not being used and before
unplugging the compressor.
Pump
The pump is used to compress the air and discharge the compressed air into the air tank through a
reciprocating piston.

IMPORTANT INFORMATION
12
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
Safety relief valve
This valve automatically gets activated if the compressor does not shut down automatically due to
high pressure in the air tank. To operate manually, pull the relief valve ring to relieve air pressure in
the tank.
Tank pressure gauge
The gauge indicates the pressure level of stored air in the air tank. It cannot be adjusted manually.
Thermal overload protector
This protector will automatically turn OFF the compressor if the temperature of the electric motor
exceeds a predetermined limit. If the thermal overload protector is activated, the motor must be
allowed to cool down before starting.
Outlet pressure gauge
The gauge is used to measure the regulated pressure at the air line outlet.
Effects of moisture in compressed air
Moisture in compressed air will form droplets when passing through the pump. When humidity is high
or when a compressor is in continuous use for an extended period of time, this moisture gets collected
in the air tank. If the compressor is connected to air tools for spraying applications, this water will flow
from the tank through the hose and outside the gun as droplets mixed with the spray material.
In paint spray application, water spots will be formed on painting surface due to condensation. In
sandblasting application, sand clumps will form and clog the gun, thereby causing the gun to be
ineffective.
Note: To reduce the moisture in compressed air, place a filter near the gun.

ASSEMBLY INSTRUCTIONS
13
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
Before assembly
• Unpack the carton and take out the air compressor. Make sure all parts are present. Inspect
the unit for damage.
• If any part is missing or damaged, do not attempt to assemble the product. Contact customer
service for replacement parts.
• Complete a damage claim for replacement parts immediately as there is time limitation.
• Check the compressor’s serial label to ensure that the correct model was received, and that it
has the required pressure rating (120/150 PSI) for its intended use.
Assembly of the compressor
1. Place the compressor (1) on a flat, even,
concrete floor surface or separate
concrete foundation in a clean,
well-ventilated area
(fig A) .
Note: Make sure the compressor is placed on a
flat surface to ensure proper drainage of the
moisture in the tank.
2. Locate the compressor near a grounded
electrical outlet (2)
(fig A) .
Note: During cold weather, store the
compressor in a heated place when not in use.
This will reduce motor starting problems and
freezing of water condensation.
CAUTION!
Potential hazard that may result in moderate injury or damage to
equipment.
• To avoid damaging the motor, do not use the compressor in areas
containing dust particles.
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OPERATING INSTRUCTIONS
14
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
Break-in procedure
1. Make sure the ON/OFF switch (1) is in
the OFF position
(fig B).
2. Open the drain valves (1) by turning
them counter-clockwise to permit air to
escape and prevent air pressure
build-up in the air tank during the
break-in period
(fig C) .
WARNING!
Potential hazard that could result in serious injury or loss of life.
• Do not touch the compressor while operating, as the motor will be very hot.
Allow the compressor to cool before handling or servicing it to avoid skin
burns or other injuries.
• Do not move or attempt to service the compressor when the air tank is
under pressure.
• Never use air hose or power cord to pull or move the compressor. If
required, use the handle to move it.
• Never direct air stream toward yourself or other people standing nearby.
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MC-589308-04
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fig C
MC-589308-05
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OPERATING INSTRUCTIONS
15
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
3. Turn the pressure regulator knob (1)
counter-clockwise to reduce the
pressure at the air line outlet
(fig D) .
4. Plug the power cord (1) into the
electrical outlet (2)
(fig E) .
5. Set the ON/OFF switch (1) to the AUTO
position
(fig F) .
6. Allow the motor to run for 30 minutes at
zero PSI under no load conditions.
7. After 30 minutes, move the ON/OFF
switch to the OFF position and close the
drain valves. The compressor is now
ready for use.
CAUTION!
Potential hazard that may result in moderate injury or damage to
equipment.
• Wear safety glasses when opening the drain valves, as the air and moisture
released from the tank can propel debris that may cause eye injury.
MC-589308-06
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MC-589308-07
fig E
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MC-589308-08
fig F
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OPERATING INSTRUCTIONS
16
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
Start-up procedure
1. Make sure the drain valves are closed.
2. Connect an air hose (1) to the air line
outlet (2). Then connect the air hose to
an air tool (3)
(fig G) .
3. Turn ON the power supply to the
compressor. Set the ON/OFF switch (1)
to the AUTO position
(fig H) .
4. Let the motor run.
5. Adjust the air hose pressure gradually
with respect to the operating pressure of
the air tool by turning the pressure
regulator knob (1) clockwise
(fig I) .
WARNING!
Potential hazard that could result in serious injury or loss of life.
• Check the manufacturer's maximum pressure rating for air tools and
accessories. The outlet pressure must never exceed the maximum pressure
rating of the air tool.
• Do not use any storage cover to cover the compressor during operation.
• Never leave the compressor unattended. Failure to comply will result in fire
or serious personal injury.
MC-589308-09
fig G
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MC-589308-10
fig H
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MC-589308-11
fig I
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OPERATING INSTRUCTIONS
17
5 U.S. GALLONS (18.9 L) AIR COMPRESSOR 058-9308-0
Shut down procedure
1. Turn the ON/OFF switch (1) to the OFF
position. Turn OFF the power supply and
unplug the power cord (2) from the
electrical outlet
(fig J) .
2. Reduce the pressure in the tank
through
the air hose. Pulling the safety valve
ring (1) will also reduce the pressure in
the tank
(fig K) .
3. Open the drain valves and release all
moisture in the tank.
MC-589308-12
fig J
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MC-589308-12
fig K
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CAUTION!
Potential hazard that may result in moderate injury or damage to
equipment.
• Wear safety glasses when opening the drain valves, as the air and moisture
released from the tank can propel debris that may cause eye injury.