Sullair 600H User Manual page 89

SECTION 5
Table 5-2: Troubleshooting Chart
SYMPTOM
Improper unloading with
an excessive pressure
build-up causing pressure
relief valve to open
Insufficient air delivery
Excessive compressor
fluid consumption
Compressor overheating
600H, 700HH, 750, 750H, 750HH, 825, 900H, 1050 USER MANUAL
PROBABLE CAUSE
Fluid charge lost from spring chamber
on inlet valve pressure regulating valve
is set too high
Running blowdown valve pressure
regulating valve set too high
Leak in control system causing loss of
pressure signal
Inlet valve jammed
Restriction in the control system
Defective pressure relief valve
Plugged air filter
Plugged air/fluid separator
Defective pressure regulator
Engine speed too low
Control air cylinder defective
Clogged return line
Leak in the lubrication system
Separator element damaged or not
functioning properly
Defective minimum pressure/check
valve
Fluid receiver tank overfilled
Loose or broken fan belt
Dirty fluid cooler core
Dirty aftercooler
Dirty radiator core
Faulty thermostat element
Plugged fluid cooler tube (internal)
Low receiver tank fluid level
Plugged compressor fluid filter
REMEDY
Add fluid to inlet valve spring chamber by
removing plugs in the top of the spring chamber
and filing with compressor fluid.
Some fluid may leak from the control regulator at
first but will stop leaking when fluid level in the
spring chamber equalizes.
Readjust.
Check control lines.
Worn seals in inlet valve. Replace seals (kit
available).
Defective pressure regulating valves; repair valves
(kits available).
Free or replace valve.
Check all control lines and components.
Ice and other contaminants could cause
restrictions.
Replace pressure relief valve.
Replace.
Replace separator element and also change
compressor fluid and fluid filter at this time.
Adjust or repair.
Readjust engine speed.
Replace cylinder.
Clear orifice.
Check all pipes, connections and components
Change separator element.
Repair or replace.
Drain to proper level.
Tighten or change belt
Clean core thoroughly.
Clean core thoroughly.
Clean core thoroughly.
Change thermostat element.
Clean tube thoroughly.
Refill.
Change element.
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