17
Important Operating Instructions
TROUBLESHOOTING GUIDE
Operate safety relief valve manually
by pulling on ring. If it still leaks, it
should be replaced.
Possible defective safety relief valve
Air leaks from
safety relief valve
Defective motor/pressure switch.
Replace.
Excessive tank pressure
Replace
Defective motor/pressure switch
Air continues to leak
at motor/pressure
switch release valve
while motor is
running
Replace check valve
DANGER -
Do not disassemble the
check valve with tank pressurized.
Open tank petcock valve to allow air
to escape from tank prior to
servicing.
Check valve stuck in open position
Corrective Action
Possible Cause(s)
Symptom
Remove, clean, or replace
Defective pilot valve, the check valve
is stuck open
Air continues to leak
at motor/pressure
switch release valve
after motor stops
Limit the air pressure to the capacity
of the air compressor. Either use a
smaller tool or a larger air
compressor.
Air compressor is incorrectly sized
Check all hose & coupler fittings for
leaks with soapy water. Detach
leaky fittings and apply new Teflon
tape. If air hose is punctured,
replace.
Air Leaks
Move the motor/pressure switch to
the OFF position. If the motor does
not shut off, unplug the air
compressor. If the electrical
contacts are welded together,
replace the pressure switch.
Motor/pressure switch does not shut
off motor when air compressor
reaches “cut-out” pressure and safety
relief valve activates
When in the
start/stop option,
motor runs
continuously