AirMan PDS400S-6C3, Service Manual

Page: 85 / 102

4. Troubleshooting
4-5
4.2.6 Minimum speed not available even upon no-load operation
※
1: For the detailed countermeasures, refer to “Troubleshooting manual”, “Workshop manual”
published by engine manufacturer.
4.2.7 Safety valve bursts out during unloaded operation
It bursts at less
pressure
Faulty adjustment of
pressure
Re-adjust pressure
Adjustment
Change pressure gauge for
replacement one, and
re-adjust pressure gauge
Faulty adjustment
Adjustment
Replace assembly
Faulty adjustment
Faulty safety valve
It bursts at
excessive
pressure
Replace it
Faulty diaphragm of
pressure regulator
Air leak
No air leak
E
Replace diaphragm
Check pipe to pressure
regulator for leak
Faulty pipes
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
Faulty pressure gauge
Bleed pressure regulator
and check for air leak
Check orifice at second
stage of pressure regulator
Disassemble / clean or
replace parts
Orifice clogging
Clogging
Check if engine controller
(ECM) functions well
Faulty engine controller
(ECM) or cable connection
Replace it or repair
connection
Check accelerator
controller output voltage
(DCV)
Engine is in trouble
Repair the trouble and get
rid of the cause
Normality
Faulty
Check pressure sensor
output voltage (DCV)
Faulty pressure sensor
More than
1.0V
Replace it
Normality
Approx. 2.1V
Input cable connection or
accelerator controller fails
Approx.
less than 2.1V
Repair input cable
connection or replace the
controller
Normality
DC1.0V
B
C
D
※
1
Unload adjustment screw
rotation speed of the
accelerator controller is
sure has been adjusted
Faulty adjustment
Re-adjust
Faulty
adjustment
Normality
No clogging
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