6: Maintenance
ShopTek™ ST45, ST55, ST75 (U.S.A. & Mexico) Operation & Maintenance Manual
88292021-240 R01
42
Subject to EAR, ECCN EAR99 and related export control restrictions.
Air supply pressure
lower than pressure
rating
Air demand higher than air supply
• Reduce air demand
• Check piping for air leaks
Air filter clogged
Replace air filter element
Inlet valve does not open completely
Check movement of inlet valve. Check
settings of the pressure relief valve and
pressure regulator.
Pressure transducer fault
Check transducer’s contacts. Replace
transducer if contacts are normal.
Pipeline pressure
higher than unloading
pressure
Pressure transducer fault
Check transducer’s contacts. Replace
transducer if contacts are normal.
Unloading components (e.g. blow-
down valve, inlet regulator valve) are
not working properly
Check if unloading components are
working normally
Solenoid valve unload failure
Check solenoid valve
Control pipeline is leaking air
Check if control pipeline is leaking air
Fluid consumption too
high
Purge oil return line filter or nozzle
blocked
Clean purge oil return line filter and noz-
zle
Fluid/air separator element damaged
or washer displaced
Check fluid/air separator element and
washer. Replace if necessary.
System piping is leaking fluid
Check if system piping is leaking fluid
Fluid level too high
Discharge some fluid
Excessive fluid foam
Change fluid
Vibration and noise
increased
Isolator damaged
Replace isolator
Fan fault
Check centrifugal fan
Table 6-2: Troubleshooting guide
Symptom
Possible causes
Remedy
