AirMan PDS185S-6C1, Service Manual

Page: 62 / 79

4. Troubleshooting
4-6
4.2.5 Engine RPM will not drop to lowest RPM during unloaded operation
4.2.6 Safety valve bursts out during unloaded operation
It bursts at less
pressure
Faulty adjustment of
rod
Re-adjust rod
Short
Check function of speed
regulator.
Malfunction of speed
regulator.
Disassemble / clean
Replace parts.
Normal
Faulty adjustment of
pressure
Re-adjust pressure
Adjustment
Change pressure gauge for
replacement one, and
re-adjust pressure gauge.
Faulty adjustment
Adjustment
Replace it.
Faulty adjustment
It works
Check pressure regulator 2
nd
side air relief circuit.
Faulty wiring
connection
Disassemble / clean
or replace parts.
Faulty safety valve.
It burst at
higher pressure
Replace it.
Faulty diaphragm of
pressure regulator.
Air leak
No air leak
No air relieved
Air relieved
Faulty pressure
regulator
Replace it.
It will not work
2
Faulty unloader.
3
Replace pressure
regulator assembly.
Disassemble / clean
or replace.
Check pressure regulator
wiring connection for air
leak.
Faulty wiring
connection
Replace parts.
Air leak
No air leak
Check adjustment of
pressure regulator.
Check and confirm that
safety valve functions at
lower pressure than set
pressure for safety valve.
Faulty pressure gauge
Check function of pressure
regulator when receiver
tank pressure exceeds ratted
pressure.
Bleed pressure regulator
and check for air leak.
Check rod length of speed
regulator.
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