375, 375H, 400HH, 425, 425H T4F User Manual 5: Maintenance
02250223-036 R01
Subject to EAR, ECCN EAR99 and related export control restrictions. 59
Compressor does not
achieve full discharge
pressure
RUN/START valve not in RUN
position
For compressors with idle warm-up con-
trols, switch valve to RUN for full operation
Air demand is excessive Check service lines for leaks or open valves
Dirty air filter
Check the filter and change the element if
required
Defective pressure regulator
Check the diaphragm and replace with kit if
necessary
Defective idle warm-up control Replace control
Engine warning/shutdown lamp
flashing—engine is derating
Turn the compressor OFF. Use controller
menu and user interface buttons to deter-
mine engine or compressor fault. See Sec-
tion 5.11: Single Axle Controller priority
messages for probable cause.
Improper unloading
with an excessive
pressure build-up
causing the pressure
relief valve to open
Pressure regulating valve is set too
high
Readjust
Control system leak causing loss of
pressure signal
Check control lines
Defective pressure regulating valve. Repair
valve (kit available).
Inlet valve jammed Free or replace valve
Restriction in the control system
Check all control lines and components—ice
and/or other contaminants could be the cause
Defective pressure relief valve
opens when pressure is too low
Replace the pressure relief valve
Defective pressure regulator
Check the diaphragm and replace with kit if
necessary
Insufficient air delivery
RUN/START valve not in RUN
position
For compressors with idle warm-up con-
trols, switch valve to RUN for full operation
Plugged air filter Replace
Defective idle warm-up valve Replace valve
Plugged air/fluid separator
Replace separator element and also
change compressor fluid and fluid filter
Defective pressure regulator Adjust or repair
Engine warning/shutdown lamp
flashing—engine is derating
Turn the compressor OFF. Use controller
menu and user interface buttons to deter-
mine engine or compressor fault. See Sec-
tion 5.11: Single Axle Controller priority
messages for probable cause.
Excessive compres-
sor fluid consumption
Clogged return line Clear orifice and return line strainer
Lubrication system leak Check all pipes, connections and components
Separator element damaged or
malfunctioning
Change separator element
Excessive foaming Fluid contamination
Change fluid (fluid flush procedure is rec-
ommended). Confirm the compressor is
operating in correct temperature range.
Table 5-2: Troubleshooting guide
Symptom Probable cause Remedy
To Next Page
Loading...
