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model no. 299-1978-8  |  contact us 1-800-689-9928

KEY PARTS DIAGRAM

KEY PARTS LIST

AIR TANK

DRAIN VALVE (I)

ELECTRIC

MOTOR (A)

AIR 

R

O

S

S

E

R

M

O

C

PUMP (B)

OUTLET 

PRESSURE

GAUGE (G)

TANK

PRESSURE

GAUGE (F)

AIR 

OUTLET (H)

POWER 

CORD (K)

ON/OFF 

SWITCH (C)

AIR PRESSURE 

REGULATOR (E)

SAFETY 

VALVE (D)

AIR

TANK (J)

WARNING!

Do not exceed the tool’s maximum working pressure.

 

  

 

 

 

WARNING!

Do not attempt to open the drain valve when there is more than 10 PSI of air  pressure in the tank.

 

Plug

Grounding pin

Grounded 
outlets

 

 

  

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. ON/OFF SWITCH: 

This switch turns on the compressor and is operated manually. When in the ON 

position, it allows the operated manually. When in the ON demand. ALWAYS set this switch to OFF when the 
compressor is not being used and before unplugging the compressor.

 

D. SAFETY 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 counterclockwise to decrease the 
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. OUTLET PRESSURE GAUGE: 

The gauge measures the regulated outlet pressure.

H. AIR 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.

 

J. AIR TANK: 

The tank is where the compressed air is stored.

 

K. POWER CORD: 

This compressor should be used on a nominal 120 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. Do not use an adapter with this compressor.    

A. ELECTRIC MOTOR: 

The motor is used to power the pump. It is equipped with a thermal overload protector. 

If the motor overheats for any reason,  the thermal overload protector will shut it down in order to prevent 
the motor from being damaged.        

Summary of Contents for 299-1978-8

Page 1: ...UCTION MANUAL IMPORTANT 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 MA...

Page 2: ...TIONS 14 MAINTENANCE 18 TROUBLESHOOTING 20 EXPLODED VIEW 22 NOTE If any parts are missing or damaged or if you have any questions please call our toll free helpline at 1 800 689 9928 SAVE THESE INSTRU...

Page 3: ...voltage Disconnect from power source before servicing Compressor must be grounded Do not use grounding adaptors 3 RISK OF BURSTING Make sure the regulator is adjusted so that the compressor outlet 4 R...

Page 4: ...read all labels when you are spraying paints or toxic materials and follow all safety instructions Use a respirator mask if there is a chance of inhaling anything you are spraying Also NEVER directly...

Page 5: ...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 clo...

Page 6: ...rs Polishers Grease Caulking Guns Before you start This Mastercraft Air Compressor is ideal for a wide range of applications from fastening to greasing and engine cleaning The 11 gallon 41 6 L design...

Page 7: ...tended use 3 Positioning of the air compressor a Position the air compressor near an electrical outlet b The compressor must be at least 12 31 cm from any wall or obstruction in a clean well ventilate...

Page 8: ...utes If it fails turn it off immediately and call the toll free helpline at 1 800 689 9928 Please note that breaking in the unit is only required prior to first use 6 After 30 minutes turn off the pre...

Page 9: ...avoid personal injury always shut off and unplug the unit and relieve all air pressure from the system before performing any service on the air compressor Risk of unsafe operation Unit cycles automati...

Page 10: ...ll reduce problems related to starting the motor and the freezing of water condensation Prior to storing NOTE Refer to instructions on how to drain tank page 19 Daily Clean the air filter A dirty air...

Page 11: ...If the pressure switch is defective replace it The compressor s capacity is not enough Check the air requirements of the accessory that is being used If it is higher than the CFM Cubic Feet per Minute...

Page 12: ...valve Screw ST3 9 X 16F Rear housing Capacitor 200 uF Motor pump assembly If any parts are missing or damaged or if you have any questions please call our toll free helpline at 1 800 689 9928 15 3 1...

Page 13: ...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 I This warranty will not apply to component par...

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