Pressure switch un-
loader constantly
leaking air
Pressure switch not
unloading
Excessive vibration
Overheating
1. Malfunctioning check valve
1. Malfunctioning pressure
switch
1. Improper installation
2. Loose belts
3. Misaligned flywheel or
drive pulley
1. Compressor too small for
application
2. Cooling surfaces dirty
3. Improper cooling
1. Replace check valve if unloader bleeds
constantly.
Do not remove check valve
pressure in tank
1. Replace pressure switch if it does not release
air pressure briefly when unit shuts off.
1. Make sure unit is mounted on a level surface
with vibration pads.
2. Replace belts. Align and tighten properly.
3. Align flywheel and ddve pulley.
1. Reduce air demand or use a compressor
with more air capacity.
2. Clean all cooling surfaces of dirt and dust.
3, Install compressor in an area with adequate
cool dry air.
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