MasterCraft 58-7914-8 User manual

8-gallon Air Compressor
58-7914-8
Owner’s Manual
If any parts are missing or damaged, or if you have any questions concerning
this product, please contact the toll-free helpline, at 1-800-689-9928
6106-0170-03

2
Table of Contents
SPECIFICATIONS ---------------------------------------------------------------------------------------------------2
SAFETY GUIDELINES----------------------------------------------------------------------------------------------3
BASIC COMPRESSOR FEATURES----------------------------------------------------------------------------4
ELECTRIC MOTOR--------------------------------------------------------------------------------------------------5
AIR COMPRESSOR PUMP ---------------------------------------------------------------------------------------5
PRESSURE SWITCH ----------------------------------------------------------------------------------------------5
PRESSURE RELIEF VALVE--------------------------------------------------------------------------------------5
AIR PRESSURE REGULATOR ----------------------------------------------------------------------------------5
TANK PRESSURE GAUGE ---------------------------------------------------------------------------------------5
REGULATED PRESSURE GAUGE-----------------------------------------------------------------------------5
AIR LINE OUTLET ---------------------------------------------------------------------------------------------------5
AIR TANK DRAIN VALVE------------------------------------------------------------------------------------------5
AIR TANK---------------------------------------------------------------------------------------------------------------5
POWER CORD -------------------------------------------------------------------------------------------------------5
ASSEMBLY INSTRUCTIONS-------------------------------------------------------------------------------------6
OPERATING INSTRUCTIONS -----------------------------------------------------------------------------------7
BREAKING IN THE PUMP-----------------------------------------------------------------------------------------7
START-UP -------------------------------------------------------------------------------------------------------------7
SHUT-DOWN----------------------------------------------------------------------------------------------------------7
MAINTENANCE-------------------------------------------------------------------------------------------------------8
TROUBLESHOOTING ----------------------------------------------------------------------------------------------9
EXPLODED VIEW & PARTS LIST-----------------------------------------------------------------------------10
WARRANTY----------------------------------------------------------------------------------------------------------11
Specifications
Model #: 58-7914-8
Peak horsepower: 2
Tank size: 8
US gal. (30.3litres)
Air delivery (SCFM) @ 40 PSI: 4.3
Air delivery (SCFM) @ 90 PSI: 3.5
Cut-in pressure (PSI): 95
Maximum pressure (PSI): 125
Pump design: Cast-iron cylinder, oil-lubricated, direct drive, single phase
Motor: 3,400 RPM
Power: 120 V 60 Hz 12 A
Weight: 60 lb 10 oz (27.5 kg)
Power cord: STW 14 AWG / 96” (2.4 m)
Extension cord: SJT 14 AWG / Maximum 50’ (15 m)
NOTE: Avoid the use of extension cords whenever possible. If an extension cord must be used,
it must have a minimum wire size of 14 AWG, and must be no longer than 50’ (15 m). Use only a
3-wire extension cord that has a 3-pronged grounding plug, and plug it into a 3-holed outlet that
is suitable for the compressor’s plug.

3
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 compressor. The symbols listed below are used to indicate this information.
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
WARNING
1. RISK OF FIRE OR EXPLOSION. Do not spray a flammable or combustible liquid or paint near
sparks, flames, pilot lights, or in a confined area. The spray area must be well-ventilated. Keep
compressor at least 20' away from spray area. Do not carry and operate the compressor, or any
other electrical device near the spray area. Never smoke when spraying. Use a minimum of 25' of
hose to connect a spray gun to compressor.
2. RISK OF ELECTRIC SHOCK. Do not expose to rain. Store indoors. Hazardous voltage.
Disconnect from power source before servicing. Compressor must be grounded, do not use
grounding adaptors.
RISK OF BURSTING. Make sure the regulator is adjusted so that the compressor outlet pressure
is set lower than maximum operating pressure of the spray gun or tool. Before starting the
compressor, pull the ring on the safety valve to make sure the valve moves freely. Drain water from
tank after each use. Do not weld or repair tank.
3. RISK OF PERSONAL INJURY. Wear safety glasses. Never spray compressed air or material at
self or others. Do not use compressed air for breathing.
4. RISK OF BURSTING. Check the maximum pressure rating in the manual or the serial tag label.
The compressor outlet pressure must be regulated so that it does not exceed the maximum
pressure rating. Relieve all pressure in the hose before removing or attaching accessories.
5. RISK OF BURSTING. Do not adjust the pressure switch or relief valve for any reason. They have
been preset at the factory for this compressor’s maximum pressure. Tampering with the pressure
switch or the relief valve may cause personal injury or property damage.
6. RISK OF BURNS. The pump and the manifold generate high temperatures. In order to avoid burns
or other injuries, do not touch the pump, the manifold, or the transfer tube while the compressor is
running. Allow the parts to cool down before handling or servicing. Keep children away from the
compressor at all times.
7. RISK TO BREATHING. Be certain to read all labels when you are spraying paints or toxic
materials, and follow the safety instructions. Use a respirator mask if there is a chance of inhaling
anything you are spraying. Also, NEVER directly inhale the compressed air produced by a
compressor.
8. RISK OF EYE INJURY. Wear ANSI Z87.1 approved safety goggles when using an air compressor.
Do not point any nozzle or sprayer toward a person or any part of the body. Serious injury may
occur if the spray penetrates the skin.
CAUTION
1. Pull the pressure relief valve ring every day in order to ensure that the valve is functioning properly.
2. The compressor must be located in a well-ventilated area for cooling, and must be a minimum of
12” (30 cm) away from the nearest wall.
3. Protect the air hose and the power cord from damage and puncture. Inspect them for weak or worn
spots every week, and replace them if necessary.
4. Always wear hearing protection when using an air compressor. Failure to do so may result in
hearing loss.
5. Do not operate the compressor if it is not in a stable position. Do not operate the compressor on a
rooftop or an elevated position that could allow the unit to fall or be tipped over.

4
BASIC COMPRESSOR FEATURES
A--------ELECTRIC MOTOR
B--------AIR COMPRESSOR PUMP
C--------PRESSURE SWITCH
D--------PRESSURE RELIEF VALVE
E--------AIR PRESSURE REGULATOR
F--------TANK PRESSURE GAUGE
G--------REGULATED PRESSURE GAUGE
H--------AIR LINE OUTLET
I---------AIR TANK DRAIN VALVE
J---------AIR TANK
K--------POWER CORD
B A C
D
E
F
G
H
I
J
K

5
BASIC COMPRESSOR FEATURES
A. ELECTRIC MOTOR: The motor is used to power the pump. It is equipped with a thermal overload
protector and an automatic reset. If the motor overheats for any reason, the thermal overload protector
will shut it down in order to prevent the motor from being damaged. The motor will automatically restart
when it has cooled completely.
B. AIR COMPRESSOR PUMP: The pump compresses the air and discharges it into the tank via the
piston that moves up and down in the cylinder.
C. PRESSURE SWITCH: This switch turns the compressor on and off. It is operated manually, and when
it is in the ON position, it allows the motor to start if the pressure in the air tank is below the factory set
cut-in pressure, and allows the motor to stop if the pressure in the air tank reaches the factory set cut-
out pressure. Be sure to set this switch to the OFF position when the compressor is not being used
and before unplugging the compressor.
D. PRESSURE RELIEF VALVE: This valve is used to prevent system failure by draining pressure from
the system when it reaches a preset level if the pressure switch has not shut down the motor. It will
pop open automatically, or it can be activated manually by pulling the ring on the valve.
E. AIR PRESSURE REGULATOR: The regulator is used to adjust the pressure inside the line to the tool
that is being used. Turn the knob clockwise to increase the pressure and counter-clockwise to
decrease the pressure.
WARNING：Do not exceed the tool’s maximum working pressure.
F. TANK PRESSURE GAUGE: The gauge measures the pressure level of the air that is stored in the
tank. It cannot be adjusted by the operator, and it does not indicate the pressure inside the line.
G. REGULATED PRESSURE GAUGE: The gauge measures the regulated outlet pressure.
H. AIR LINE OUTLET: The outlet is connected to the 1/4” (6.4 mm) NPT air hose.
I. AIR TANK DRAIN VALVE: The drain valve is used to remove moisture from the air tank after the
compressor is shut off.
WARNING：Do not attempt to open the drain valve when there is more than 10 PSI of air pressure in
the tank.
J. AIR TANK: The tank is where the compressed air is stored.
K. POWER CORD: This compressor should be used on a nominal 115 V grounded circuit. Use a power
cord that is equipped with a grounding plug. Verify that the compressor is plugged into an outlet that
has the same configuration as the plug (see Figure 1). Do not use an adaptor with this compressor.
If the grounding instructions are not completely understood, or if
there is any doubt as to whether the compressor is properly
grounded, check with a licensed electrician Do not alter the plug in
any way. If it will not fit into the outlet, have the proper type of
outlet installed by a licensed electrician.
DANGER：Improper installation of the grounding plug will
result in a risk of electric shock. If it is necessary to repair or
replace the cord or plug, do not connect the grounding wire to
either flat blade terminal. The grounding wire is in the green coating.
115V/15 A
Plug
Grounded
outlet
115V/15 A
Grounding Pin
Plug

6
ASSEMBLY INSTRUCTIONS
1. Unpack the air compressor and verify that all
parts are present and undamaged. If any parts
are missing or damaged, call the toll-free
helpline, at 1-800-689-9928.
2. Check the serial tag label to ensure that the
compressor has the required pressure rating
for its intended use.
3. Take the two wheels (A), two bolts (B), four
washers (C) and two nuts (D) out of the bag,
and install them on the foot section of the tank
(see Figure 1).
4. Unpack the smaller plastic bag that contains
the air filter (E), and install the air filter on the
pump (see Figure 2).
5. Push the removable handle (F) into the fixed
steel sleeves and make sure that the tapped
holes on the handle align with the holes on the
steel sleeves. Using the four thumbscrews (G),
securely fasten the handle to the sleeves (see
Figure 3).
6. Determine the location of the compressor
according to the following guidelines:
a. Place the compressor near a grounded
electrical outlet.
b. The compressor must be at least 12’ (30
cm) away from any wall or obstruction,
and must be installed in a clean, well-
ventilated area in order to ensure
sufficient air flow and cooling.
c. The compressor must be level in order to
ensure proper drainage of moisture from
the tank.
d. In cold weather, store the compressor in
a heated building when it is not in use.
This will reduce problems related to
starting the motor and freezing of water
condensation.
6. Connect an air hose with a 1/4” (6.4 mm) NPT
fitting kit to the compressor’s air line outlet.
Figure 3
F
G
DC
A
B
Figure 1
E
Figure 2

7
OPERATING INSTRUCTIONS
BREAKING IN THE PUMP
NOTE: The pump is shipped without oil. Before using the
compressor, pour the break-in oil (included) into the pump
through the oil nozzle. Change the break-in oil after 8
hours of operation. In order to reduce maintenance and
repair problems, use 58-8143-6 Campbell Hausfeld Air
Compressor Oil. To extend the life of your compressor,
add air compressor oil before starting the air compressor.
NOTE: Please dispose of used hydraulic oil in a manner that is
compatible with the environment.
1. Check the oil level in the pump through the oil sight glass. The
pump oil level must be between A1 and A2. Do not operate the
compressor if the oil is over-filled or under-filled (see A).
2. Turn the pressure switch to the OFF position (See B)
3. Open the tank drain valve by turning it counter-clockwise (see C).
4. Plug in the power cord.
5. Turn the pressure switch to the ON position (See D). The
compressor will start. Allow the compressor to run for 30
minutes in order to break in the internal parts. If the compressor
does not operate properly after 30 minutes, turn it off
immediately and call the toll-free helpline, at 1-800-689-9928..
6. After the compressor has been running for 30 minutes, turn the
pressure switch to the OFF position.
7. Close the tank drain valve by turning it clockwise.
8. Turn the pressure switch to the ON position. The compressor
will start, fill the tank to the cut-out pressure, and then stop.
NOTE: Leaving the pressure switch in the ON position will allow
the motor to restart automatically as the compressed air is used.
START-UP
1. Before starting the compressor, check the oil sight glass in
order to verify the oil level in the pump.
2. Turn the pressure switch to the OFF position.
3. Close the tank drain valve.
4. Plug in the power cord.
5. Turn the pressure switch to the ON position.
6. Adjust the pressure regulator to the tool’s working pressure.
When lowering the pressure, turn the knob counter-clockwise
past the desired setting, and then turn it clockwise back to the
desired pressure. Do not exceed the operating pressure of the
tool or accessory that is being used.
SHUT-DOWN
1. Turn the pressure switch to the OFF position.
2. Unplug the power cord.
3. Reduce the pressure in the tank through the outlet hose.
Pulling the relief valve ring and keeping it open will also
reduce the pressure in the tank (See E).
CAUTION Escaping air and moisture can propel debris that
may cause eye injury. Wear safety goggles when opening the
drain valve
CLOSE
OPEN
ON
B
A
D
E
C
OFF
B

8
MAINTENANCE
WARNING: In order to avoid personal injury, shut off and unplug the air compressor and relieves all
air pressure from the system before performing any service.
Regular maintenance will ensure trouble-free operation. The items listed in this chart should be inspected
on a regular basis.
ITEM DESCRIPTION
SERVICE
INTERVAL
Drain the tank
To prevent corrosion of the tank from the inside, the
condensation must be drained at the end of every
workday. Be sure to wear protective goggles. Relieve the
air pressure in the system and open the drain valve on the
bottom of the tank in order to drain it.
Daily
Check the oil Check the oil level in the pump through the oil sight glass. The oil level in the pump must be within the red circle.
Do not over-fill or under-fill. Daily
Check the relief valve Pull the relief valve on the ring every day in order to ensure that it is operating properly and in order to clear
the valve of any possible obstructions. Daily
Clean the air filter
A dirty filter will reduce the performance and the life of the
compressor. In order to avoid any contamination of the
inside pump, the filter should be cleaned frequently and
replaced on a regular basis. The foam filter should be
cleaned using warm and soapy water.
Weekly
Test for leakage
Check all connections to verify that they are tight. A small
leak in the tank, hoses, pipe connections, or transfer tubes
will reduce the performance of the compressor.
Spray a small amount of soapy water around the area of
the suspected leak with a spray bottle. If bubbles appear,
repair or replace the faulty component. Do not over-tighten
the connections.
N/A
Storage
Before storing the compressor for a long period, use an air
blowgun to clean all dust and debris from the compressor.
Disconnect and coil the power cord. Pull the pressure
relief valve in order to release all pressure from the tank.
Drain all moisture from the tank. Cover the entire
compressor in order to protect it from moisture and dust.
N/A

9
TROUBLESHOOTING
NOTE: Several problems may have similar causes and solutions.
PROBLEM POSSIBLE CAUSE SOLUTION
The motor will
not run or start
The power cord is not plugged in Plug the power cord into a grounded outlet.
The pressure switch is in the “OFF”
position Turn the switch to the “ON” position
The extension cord is the wrong wire
gauge or is too long Check chart on page 2 for the proper wire gauge and cord length
The motor’s thermal overload
protection has tripped Turn the air compressor off, wait until the motor has cooled down, and then check the motor’s circuit breaker
A fuse has blown or a circuit breaker
has been tripped
-Replace the fuse or reset the circuit breaker
-Verify that the fuse has the proper amperage
-Check for low voltage conditions
-Disconnect any other electrical appliances from the
circuit, or operate the compressor on a dedicated circuit
The air tank pressure exceeds the
preset pressure switch limit The motor will start automatically when the tank pressure drops below the cut-in pressure.
The check valve is stuck open Remove the check valve and clean it or replace it.
Electrical connections are loose Have the compressor serviced by a qualified
professional.
The motor, capacitor, or check valve
is defective Have the compressor serviced by a qualified professional.
The motor runs
continuously
when the
Start/Stop
option is
activated
The pressure switch does not shut off
the motor when the air compressor
reaches the cut-out pressure and the
safety relief valve activates
Move the pressure switch to the OFF position. If the
motor does not shut off, unplug the air compressor. If the
electrical contacts are welded together, replace the
pressure switch.
The compressor is not large enough
Check the air requirement of the accessory that is being
used. If it is higher than the CFM and the pressure
supplied by compressor, a larger compressor is needed.
Most accessories are rated at 25% of actual CFM while
running continuously.
The regulator
does not
regulate the
pressure
The regulator or its internal parts are
dirty or damaged. Replace the regulator.
The pressure is
low, or there is
not enough air
There is a leak at one of the fittings Check the fittings with soapy water. Tighten or reseal
leaking fittings. Do not over-tighten.
The tank drain valve is open Close the drain valve
The air intake is restricted Clean or replace the air filter element.
Prolonged excessive use of air Decrease the amount of air used.
There is a hole in the air hose Check the air hose, and replace it if necessary.
The tank leaks Replace the tank Immediately. Do not attempt to repair it.
The valve is leaking Check for worn parts, and replace them if necessary.
There is
moisture in the
discharge air
There is condensation in air tank
caused by a high level of atmospheric
humidity or because the air
compressor has not been running
long enough.
Drain the air tank after each use. Drain the air tank more
often in humid weather, and use an air line filter.
The compressor
overheats
The ventilation is inadequate Relocate the compressor to an area with cool, dry, and
well-circulated air.
Cooling surfaces are dirty Clean all cooling surfaces on the pump and the motor
thoroughly.
The valve is leaking Replace worn parts and reassemble using new seals.

10
EXPLODED VIEW
PARTS LIST
Part No. Description Quantity Part No. Description
Q
uantity
1 SHOULDER BOLT 2 17 BLEEDING TUBE 1
2 WHEEL 2 18 PRESSURE SWITCH 1
3 WASHER 4 19 PRESSURE GAUGE 1
4 SPRING WASHER 2 20 ADAPT FITTING 1
5 NUT 4 21 REGULATOR 1
6 TANK 1 22 QUICK CONNECTOR 1
7 TRANSFER TUBE 1 23 PLASTIC ANCHOR&NUT 2
8 RIGHT ELBOW 1 24 POWER CORD 1
9 INTAKE FILTER 1 25 BOLT 2
10 PUMP ASSEMBLY 1 26 RUBBER FOOT 2
11 MOTOR ASSEMBLY 1 27 CHECK VALVE 1
12 SHROUD 1 28 DRAIN VALVE 1
13 HANDLE 1
29 BOLT 4
14 HANDLE SLEEVE 1
30 WASHER 6
15 THUMBSCREW 4
31 BOLT 2
16 RELIEF VALVE 1
32 PRESSURE GAUGE 1

11
MASTERCRAFT® LIMITED WARRANTY
This MASTERCRAFT® product is guaranteed for a period of 3 years from the date of original retail
purchase against defects in materials and workmanship.
Subject to the conditions and limitations described below, this product, if returned to us with proof of
purchase within the stated warranty period and if covered under this warranty, will be repaired or replaced
(with the same model, or one of equal value or specification), at our option. We will bear the cost of any
repair or replacement and any costs of labour relating thereto.
These warranties are subject to the following conditions and limitations:
a) a bill of sale verifying the purchase and purchase date must be provided;
b) this warranty will not apply to any product or part thereof which is worn or broken or which has
become inoperative due to abuse, misuse, accidental damage, neglect or lack of proper
installation, operation or maintenance (as outlined in the applicable owner’s manual or operating
instructions) or which is being used for industrial, professional, commercial or rental purposes;
c) this warranty will not apply to normal wear and tear or to expendable parts or accessories that may
be supplied with the product which are expected to become inoperative or unusable after a
reasonable period of use;
d) this warranty will not apply to routine maintenance and consumable items such as, but not limited
to, fuel, lubricants, vacuum bags, blades, belts, sandpaper, bits, fluids, tune-ups or adjustments;
e) this warranty will not apply where damage is caused by repairs made or attempted by others (i.e.
persons not authorized by the manufacturer);
f) this warranty will not apply to any product that was sold to the original purchaser as a
reconditioned or refurbished product (unless otherwise specified in writing);
g) this warranty will not apply to any product or part thereof if any part from another manufacturer is
installed therein or any repairs or alterations have been made or attempted by unauthorized
persons;
h) this warranty will not apply to normal deterioration of the exterior finish, such as, but not limited to,
scratches, dents, paint chips, or to any corrosion or discolouring by heat, abrasive and chemical
cleaners; and
i) this warranty will not apply to component parts sold by and identified as the product of another
company, which shall be covered under the product manufacturer’s warranty, if any.
Additional Limitations
This warranty applies only to the original purchaser and may not be transferred. Neither the retailer nor
the manufacturer shall be liable for any other expense, loss or damage, including, without limitation, any
indirect, incidental, consequential or exemplary damages arising in connection with the sale, use or
inability to use this product.
Notice to Consumer
This warranty gives you specific legal rights, and you may have other rights, which may vary from province
to province. The provisions contained in this warranty are not intended to limit, modify, take away from,
disclaim or exclude any statutory warranties set forth in any applicable provincial or federal legislation.