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Squirt soapy water around joints during
compressor operation and watch for bubbles.
Developing bubbles indicate a leak is present.
Tighten fittings if necessary.
Engine Maintenance
Perform engine maintenance as specified in the engine
Owner’s Manual. Items include:
Change oil after the first 20 operating hours, and
at least every 100 operating hours thereafter and
oil filter, as directed in engine Owner’s Manual.
WARNING: Burn hazard
Never open oil port while engine is running. Hot oil can
spray over face and body.
Air filter check/replacement
Spark plug cleaning/replacement
Fuel filter check/replacement
Fuel tank cleaning
Change Pump 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” 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 5)
Figure 5
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 rested 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 could 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.
Belts will stretch from normal use. When properly
adjusted, a 5 lb. force applied to the belt between the
engine 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 holding the engine to
the compressor.
3. Shift the engine in the proper direction The belt
must be properly aligned when adjustment is
made.
4. To align belt, lay a straight edge against the face
of the flywheel touching the rim at two places.
(Figure 6)
Figure 6
5. Adjust flywheel or engine pulley so that the belt
runs parallel to the straight edge.
6. If necessary, use a gear puller to move the pulley
on the motor shaft. Tighten set screw after pulley
is positioned.
7. Check for proper belt tension. (Figure 7)
Figure 7
8. Tighten the four fasteners holding the engine to
the top plate while tension and alignment is
maintained.
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