5: Maintenance 185 T3 Kubota User Manual
02250223-054 R01
48 Subject to EAR, ECCN EAR99 and related export control restrictions.
Compressor does not
achieve full discharge
pressure
Run/start switch not in run position
For compressors with idle warm-up
controls, switch toggle 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 ele-
ment if required
Defective pressure regulator
Check the diaphragm and replace with
kit if necessary
Defective idle warm-up control Replace control
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 compo-
nents. 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 switch not in run position
For compressors with idle warm-up
controls, switch toggle to RUN for full
operation
Plugged air filter Replace
Defective idle warm-up control Replace control
Plugged air/fluid separator
Replace separator element and also
change compressor fluid and fluid filter
Defective pressure regulator Adjust or repair
Engine speed too low Readjust engine speed
Excessive compressor
fluid consumption
Clogged return line Clear orifice and return line strainer
Lubrication system leak
Check all pipes, connections and com-
ponents
Separator element damaged or
malfunctioning
Change separator element
Excessive foaming Fluid contamination
Change fluid (fluid flush procedure is
recommended). Confirm the compres-
sor is operating in correct temperature
range.
Table 5-1: Troubleshooting guide—engine stops, does not crank, or cranks but does not start
Symptom Probable cause Remedy
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