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TROUBLESHOOTING GUIDE FOR UNITS IN SERVICE FOR A PERIOD OF TIME (CONTINUED)
Symptom
Milky oil in crankcase
Pressure switch continually
blows air out the unloader valve
Pressure switch does not
release air when the compressor
shuts off
Compressor will not shut off
Unit vibrates excessively
Water in discharge air
Possible Cause(s)
1. Low usage of compressor -
water is condesing in the
crankcase
2. Wrong type of oil
3. Improper environment
4. Rotation incorrect
5. Slight leakage of tank check
valve
Defective check valve
Pressure switch unloader not
working properly
1. Defective pressure switch
2. Defective safety valve
1. Loose fasteners
2. Loose pulley, loose belt or
misalignment or pulleys
3. Defective pump
1. Hot humid weather
2. Water accumulated in the tank
Corrective Action
1. Run the compressor continuously for 1 hour. The heat
generated during this running period will evaporate the
moisture out of the oil
2. Do not use SAE-30 automotive type oil. Using the wrong
oil can cause various problems with the pump and will void
the warranty. Only use the oils that the operating manual
recommends
3. Unit should not be installed in a poorly vented area or exposed
to extreme cold or hot conditions. Normal operating range
should be between 32°F and 100°F
4. Check to make sure the compressor is running the direction
of the flywheel arrow. Air flow should be so that the flywheel
directs air across the head of the pump. Standing in front of the
compressor (non-belt guard side) air should flow back to front
5. Air cools and condensates, then leaks back into the pump.
Draining tank of air after use will normally take care of this
situation
Replace check valve
Drain the tank of all pressure. Restart compressor under no load.
If compressor is able to start, then the unloader needs to be
checked. If this problem is not corrected it will fail the motor and /
or other electrical components
1. Replace pressure switch
2. Make sure tank pressure gauge is reading correctly and if
necessary replace tank safety valve
1. This includes mounting bolts for the pump, motor, belt guard,
mag. starter, etc. Check for loose fasteners as part of a routine
maintenance schedule. Tighten any loose fasteners
2. The pulley and belt may need to be tightened over time. The
pulleys may need to be realigned to assure proper belt wear
and lower vibration. These should be checked as part of
regular maintenance
3. A defective pump includes knocking or making noises not
normal to the pump design. Severe oil out the breather usually
indicates ring or cylinder wear. Low pump performance could
indicate valve problems. There are numerous symptoms
associated with a defective pump. The pump will need to be
evaluated
1. During hot and humid weather it is normal to accumulate water
in the compressor tank. This is normal and requires frequent
draining of tank. We recommend use of an automatic drain
along with filters and dryers if this is a problem
2. Drain tank of water to prevent tank corrosion and air tool wear.
It is recommended use of an automatic drain along with filters
and dryer to prevent water into exhaust air of the compressor
Continued on next page
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