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8.2 TROUBLESHOOTING GUIDE
SYMPTOM/MESSAGE
HI T4 SD (CONT.)
HI T5 SD
AIR FLTR DP SD
COMPRESSOR DOES NOT BUILD
FULL DISCHARGE PRESSURE
ENGINE OVERHEATING
PROBABLE CAUSE
Compressor Air Inlet Temperature
Above 115°F (46°C)
High Interstage Pressure (Loaded)
High Interstage Pressure (Unloaded)
Blowdown Valve Failed to Open During
Unload
Low Fan Speed
Temperature Transducer Failure
Aftercooler Core Fouled
Inlet Throttling Valve Not Fully Open
During Loaded Operation
Blowdown Valve Failed to Open or
Opened Sluggishly
Low Fan Speed
Dirty Air Intake Filter and Bad Switch
Air Demand Exceeds Supply
Inlet Air Filter Clogged
Inlet Air Valve Not Fully Open
Transducer P2 Malfunction
Blowdown Valve Leaking or Sluggish
Defective LP Stage
Loose or Broken Fan Belt
Dirty Radiator Core
Dirty Charger Cooler
Low Oil Level
Faulty Water Pump
TROUBLESHOOTING
REMEDY
Maintain air inlet temperature below 115°F
(46°C).
Insufficient coolant flow to jackets. Defective
HP stage.
Clogged blowdown silencer- clean and
replace.
Refer to
Section 7.9.7
for blowdown valve
maintenance.
Re-tension fan belt or replace if damaged.
Check connections from transducer. If ade-
quate, replace transducer.
Clean fins.
See inlet valve adjustment, or low oil pressure,
defective 4-way solenoid valve, or defective
hydraulic cylinder.
Refer to
Section 7.9.7
for valve maintenance.
Re-tension fan belt or replace if damaged.
Clean pre-filter with water. Replace both filter
elements. If necessary, check switch.
Check air service lines for open valves or
leaks.
Check for maintenance message on
Supervisor display. Change element.
Check actuation and butterfly disc position.
Low oil pressure defective control solenoid
valve.
Check connections from transducer. If ade-
quate, replace transducer.
Refer to
Section 7.9.7
for blowdown valve
maintenance.
Consult Sullair Service
Department.
Tighten or change belt. Refer to the Engine
Operator's Manual for details.
Clean thoroughly. Refer to the Engine
Operator's Manual for details.
Clean thoroughly. Refer to the Engine
Operator's Manual for details.
Refill. Refer to the Engine Operator's Manual
for details.
Change pump. Refer to the Engine Operator's
Manual for details.
Section 8
39
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