SANY LATIN AMERICA
7-75
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
E-9 Bucket speed or power is low
Trouble
Bucket speed or power is low during operation.
Related information
Pilot pressure of the bucket can be checked on the monitor.
Possible causes and standard value in normal state
Cause
Standard value in normal state/Remarks on troubleshooting
1
Failure of
sensor
●
Turn engine start switch to OFF position. Start the engine and keep it running
to perform troubleshooting.
Levers in NEUTRAL, bucket-curl/dump pressure signals
Pressure
0 KG
Levers in operation, bucket-curl/dump pressure signals
0~39 KG
2
Short circuit
of harness
(grounded)
●
Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Between harness (from controller pin 69 to CN-124M A)
and ground
Between harness (from controller pin 50 to CN-127M A)
and ground
Resistance
≥
1M
Ω
3
Open circuit
of harness
●
Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Between controller pin 54 and CN-124M B
Between controller pin 54 and CN-127M B
Resistance
≤
1
Ω
4
Defective
bucket
con
fl
uence
solenoid
valve
●
Turn engine start switch to OFF position. Keep it at OFF position to perform
troubleshooting.
Between CN-134F 1 and 2
Resistance
About 17.5
Ω
5
Failure of
controller
No troubleshooting can be done due to internal failure. (Failure lies in the control-
ler if the reasons above are ruled out)
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