5: Maintenance 600H, 700, 750, 750H, 750HH, 825, 900, 900H, 1050 T3 CAT User Manual
02250197-981 R01
66 Subject to EAR, ECCN EAR99 and related export control restrictions.
Compressor will not build
up full discharge pressure
Air demand is too great
Check service lines for leaks of open
valves.
Dirty air filter
Check the filter gauges on instrument
panel and change element if required.
Pressure regulator out of adjust-
ment
Adjust regulator according to control
adjustment instructions in the Mainte-
nance section.
Defective pressure regulator
Check diaphragm and replace if neces-
sary (kit available).
Defective air inlet cylinder Replace cylinder
Improper unloading with an
excessive pressure build-
up causing pressure relief
valve to open
Fluid charge lost from spring cham-
ber on inlet valve pressure regulat-
ing valve is set too high
Add fluid to inlet valve spring chamber
by removing plugs in the top of the
spring chamber and filing with com-
pressor fluid.
Some fluid may leak from the control
regulator at first but will stop leaking
when fluid level in the spring chamber
equalizes.
Running blowdown valve pressure
regulating valve set too high
Readjust.
Leak in control system causing loss
of pressure signal
Check control lines.
Worn seals in inlet valve. Replace
seals (kit available).
Defective pressure regulating valves;
repair valves (kits available).
Inlet valve jammed Free or replace valve.
Restriction in the control system
Check all control lines and compo-
nents.
Ice and other contaminants could
cause restrictions.
Defective pressure relief valve Replace pressure relief valve.
Insufficient air delivery
Plugged air filter Replace.
Plugged air/fluid separator
Replace separator element and also
change compressor fluid and fluid filter
at this time.
Defective pressure regulator Adjust or repair.
Engine speed too low Readjust engine speed.
Control air cylinder defective Replace cylinder.
Symptom Probable cause Remedy
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