Maintenance – Northern Industrial Tools 2 HP / 4 GALLON AIR COMPRESSOR User Manual

Page 7

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these tips:

1. Try to keep Air Compressor stored in

temperatures above 32° fahrenheit.

2. Open the Air Tank Drain Valve and release all

air pressure from the Air Tank before attempting

to start in cold weather. (After air is released

3. Plug Air Compressor directly into a 120 volt

electrical outlet. Do not use an extension cord

when starting your Air Compressor in cold



Daily (or before each use)

1. Check oil level

2. Drain condensation from the air tank.

3. Check for any unusual noise or vibration.

4. Be sure all nuts and bolts are tight.


1. Clean breather hole on Oil Breather Cap.


1. Inspect air system for leaks by applying soapy

water to all joints. Tighten these joints if leaks

are discovered.

6 Months (or after 250 hours of operation -

whichever comes first)

1. Change Air Compressor Oil.

Note: Change oil more often if Air Compressor is

used near paint spraying operations or in dusty


Checking the Air Compressor Oil

1. Place Air Compressor on level surface. The oil

level should be at the red dot on the Oil Sight


2. If oil level is low, remove Oil Breather Cap and

add enough oil to bring the oil level to the red

dot on the Oil Sight Glass.

3. Replace Oil Breather Cap before starting


Changing the Air Compressor Oil

Note: This compressor uses only SAE 5W-30

motor oil.

1. Remove the Drain Plug under the Oil Sight

Glass by turning the nut counter-clockwise with

wrench. (See Figure 2.)

Note: Oil will begin to drain as Drain Plug is

loosened. Place a funnel and oil pan in place

BEFORE loosening Drain Plug.

2. Once Drain Plug is removed, tilt Air Compressor

backwards to allow all of the oil to drain out of

the crankcase.

3. Once oil is drained, replace Drain Plug and

securely tighten in place with a wrench. Be

careful not to overtighten the Drain Plug, as this

could damage the rubber seal.

4. Place Air Compressor on level surface.

5. Remove the Oil Breather Cap.

6. Slowly pour the oil into the Oil Fill hole, until the

oil level rises to the center of the red dot on the

Oil Sight Glass.

7. Install the Oil Breather Cap into the Oil Fill hole.

Firmly hand tighten the Oil Breather Cap by

turning clockwise.

Always inspect the tool before use, and make sure

it is in good working condition. Make sure all air

vents are clear, (use compressed air to clean the

machine where possible). Check the power cable to

make sure it is intact and free from cracks, bare

wires etc. Avoid using solvents when cleaning

plastic parts. Most plastics are susceptible to

damage from the various types of commercial