Troubleshooting - Hokuetsu AIRMAN PDS185S-6EZ1 Instruction Manual

4. Failure cause and measures

4.2 Troubleshooting

Should any trouble occur during operation, do not leave it. Investigate the cause and take
appropriate measures. Read the manual carefully and fully understand what to do in case of trouble.

The better you understand the construction and function of the unit, the faster you can find the
problem and solution.

This chapter describes the symptom, cause and countermeasures of important troubles in detail.
Symptom
Low starter revolution speed.
The starter rotates normally
but the engine does not start.
The discharge air pressure
will not rise.
The engine does not reach the
rated revolution speed.
If the discharge pressure will
not increase to the specified
one, RPM will drop.
Engine does not reach
minimum revolution at
unload.
Safety valve relieves at
unload.
Oil mixes in air.
(poor oil separation)
Cause
(1) Faulty battery
(2) Failure of battery charging
(3) Faulty alternator
(4) Faulty starter
(1) Fuel filter clogging.
(2) No fuel
(3) Air entry into fuel line system
(4) Nozzle clogging
(1) Pressure regulator insufficient
adjustment.
(2) Trouble of solenoid valve for starting
unloader.
(1) Faulty engine controller
(2) Failure of the emergency controller.
(3) Unloader orifice clogging.
(4) Engine trouble.
(5) Fuel filter clogging.
(6) Water is accumulated in fuel filter.
(7) Air filter element clogging.
(8) The engine-protecting function being
in use. (coolant rising /fuel
temperature rising)
(9) Disconnection of the solenoid valve
for starting unloader.
(1) Pressure regulator insufficient
adjustment.
(2) Trouble of pressure regulator.
(3) Unloader orifice clogging.
(1) Failure of the engine controller
(2) Failure of the emergency controller.
(1) Pressure regulator insufficient
adjustment.
(2) Unloader valve damaged･Faulty seat
(3) Faulty safety valve.
(1) Scavenging orifice strainer clogging.
(2) Excessive oil in separator receiver
tank.
(3) Low discharge pressure.
(4) Oil separator element deteriorated.
4-3
Countermeasures
Check battery→Charge
Change
Change
Change
Disassemble, clean, and
change
Fuel replenishment
Bleed air
Disassemble/Clean
Re-adjust (fasten)
Change
Call your nearest dealer
Call your nearest dealer
Disassemble/Clean
Call your nearest dealer
Disassemble/Change
Drain water
Clean or change of
element
Unload operation or stop
the engine
Change solenoid valve for
starting unloader
Re-adjust (fasten)
Change
Disassemble/Check
Call your nearest dealer
Call your nearest dealer
Re-adjust (loosen)
Change
Change
Disassemble/Clean
Drain to its proper level
Disassemble and check of
pressure control valve
Check /Change