94
FAULT FINDING
12/154
FAULT
CAUSE
REMEDY
Air discharge capacity
too low.
Engine speed too low.
See ”
Engine speed too low”.
Blocked air cleaner.
Check the restriction indicators and replace the element(s) if necessary.
High pressure air escaping.
Check for leaks.
Incorrectly set regulation system.
Reset the regulation system. Refer to
SPEED AND PRESSURE
REGULATION ADJUSTMENT
in the
MAINTENANCE
section of this manual.
Compressor overheats.
Low oil level.
Top up the oil level and check for leaks.
Dirty or blocked oil cooler.
Clean the oil cooler fins.
Incorrect grade of oil.
Use Doosan recommended oil.
Defective by-pass valve.
Check the operation of the element and replace if necessary.
Recirculation of cooling air.
Move the machine to avoid recirculation.
Reduced cooling air from fan.
Check the fan and the drive belts. Check for any obstruction inside the fan
cowl.
Excessive oil present in
the discharge air.
Blocked scavenge line.
Check the scavenge line, drop tube and orifice. Clean and replace.
Perforated separator element.
Replace the separator element.
Pressure in the system is too low.
Check the minimum pressure valve.
Safety valve operates.
Operating pressure too high.
Refer to
SPEED AND PRESSURE REGULATION ADJUSTMENT
in the
MAINTENANCE
section of this manual.
Incorrect setting of the regulator.
Adjust the regulator.
Faulty regulator.
Replace the regulator.
Inlet valve set incorrectly.
Refer to
SPEED AND PRESSURE REGULATION ADJUSTMENT
in the
MAINTENANCE
section of this manual.
Loose pipe/hose connections.
Check all pipe/hose connections.
Faulty safety valve.
Check the relieving pressure. Replace the safety valve if faulty.
DO NOT ATTEMPT A REPAIR.
Oil is forced back into
the air filter.
Incorrect stopping procedure used.
Always employ the correct stopping procedure. Close the discharge valve
and allow the machine to run on idle before stopping.
Faulty inlet valve.
Check for free operation of the inlet valve(s).
Machine goes to full
pressure when started.
Faulty load valve.
Replace the valve.
Machine fails to load
when the load switch is
pressed.
Faulty load valve.
Replace the valve.
Faulty switch.
Test switch.
Loose pipe/hose connections.
Check all pipe/hose connections.
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