Change Pump Oil; Drain Receiver Tank And Inspect Tank; Check Drive Belt For Tension And Alignment; Keep Compressor Clean - NorthStar 25654 Owner's Manual

Change Pump Oil

WARNING: Burn hazard
Never open oil fill port while compressor is running. Hot
oil can spray over face and body.
Change oil after the first 50 hours of use then every 3
months or 500 hours; change pump oil while crankcase
is still warm. (See "Appendix A: Lubricants and
Compatibility" for suitable alternatives.)
1. Remove the oil fill and drain plugs. Collect the oil
in a suitable container.
2. Replace the oil drain plug and refill compressor
crankcase with clean oil.
3. Replace the oil fill plug.
4. Start the unit and run for several minutes. Shut
down the air compressor and recheck the oil
level. If necessary, add more oil. (Figure 7)

Drain Receiver Tank and Inspect Tank

Drain water from the receiver tank daily. Water left in the
tank can cause the tank to weaken and corrode,
increasing the risk of tank rupture. Badly rusted receiver
tanks must be replaced.
Northern Tool recommends a tank inspection after every
2 years of service. See "Inspection of Unfired Pressure
Vessels," volumes 2-9, August 2001, Bill McStraw
(available on-line at NTIS)."
WARNING: Air tank hazards
Failure to replace a rusted air receiver tank will
eventually result in tank rupture or explosion, which
could cause substantial property damage, severe
personal injury, or death. Never modify or repair a tank.
Obtain replacement from service center.

Check Drive Belt for Tension and Alignment

CAUTION: Pulley/sheave hazard
Improper pulley/sheave alignment and belt tension can
result in motor overload, excessive vibration and
premature belt and/or bearing failure. To prevent this
from happening, check the pulley/sheave alignment and
belt tension on a regular basis.
Full
Add
Figure 7
Belts will stretch from normal use. When properly
adjusted, a 5 lb. force applied to the belt between the
motor pulley and the pump will deflect the belt about ½".
To align and adjust drive belt tension:
1. Remove the belt guard cover.
2. Loosen the four fasteners securing the motor to
the compressor unit.
3. Slide the motor to achieve proper belt tension.
(Usually 1/8" to 1/4" is sufficient.) The belt must
be properly aligned before refastening the motor.
4. To align belt, lay a straight edge against the face
of the compressor sheave (flywheel) touching the
rim at two places. (Figure 8)
5. Adjust the motor pulley by shifting the motor so
that the belt runs parallel to the straight edge.
6. If necessary, use a gear puller to move the motor
pulley. Tighten set screw after motor pulley is
positioned.
7. Check for proper belt tension. (Figure 9)
8. Tighten the four fasteners holding the motor to
the top plate while tension and alignment is
maintained.
9. Attach the belt guard cover.

Keep Compressor Clean

Do not allow air intakes to become blocked. If dust or
debris accumulates in the compressor, clean the
compressor with a damp cloth or soft bristle brush.
Note: Do not spray compressor with a garden hose or
pressure washer. Water may enter the compressor
and cause damage to the engine and pump.
13
Figure 8
Figure 9