795-94048
12 of 49
12/15/21
TROUBLESHOOTING GUIDE
CONDITION
POSSIBLE CAUSE
CORRECTION
P
ump
Pump does not run
(-A and -B units)
Machine is unplugged
Plug machine into outlet
Circuit breaker is tripped
Check breaker and correct.
If problems persist, contact
Graymills.
Pump motor is burned out
Replace pump
Faulty switch
Replace switch
Pump does not run
(-GAM units)
Insufficient air pressure
Ensure air pressure is set to 60
psi min
Air motor vanes seized
Inject 5 drops #10 oil into air
motor inlet
Pump runs but does not
pump fluid
(ALL units)
Selector valve is out of
position
Correct valve position
Pump filter screen is clogged
Clear debris from around pump
Flexible metal hose clogged
Clear debris from metal hose
Pump rubber discharge hose
clogged
Clear debris from hose or
replace hose
Pump runs but does not
pump fluid
(External filter units)
External filter is clogged
Replace external filters
Pump runs but is noisy
(Some noise is normal).
Cavitation due to low liquid
level
Raise liquid level to correct
level
