SANY LATIN AMERICA
7-74
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
E-8 Arm speed or power is low
Trouble
Arm speed or power is low during operation.
Related information
Pilot pressure of the arm in operation 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 sen-
sor
●
Turn engine start switch to OFF position. Start the engine and keep it run-
ning to perform troubleshooting.
Levers in NEUTRAL, arm-in and arm-out pressure
signals
Pressure
0 KG
Levers in operation, arm-in and dump pressure
signal
0~39 KG
2
Short circuit
of harness
(grounded)
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between harness (from controller pin 71 to CN-
128M A) and ground
Between harness (from controller pin 52 to CN-
122M A) and ground
Resistance
≥
1M
Ω
3
Open circuit of
harness
●
Turn engine start switch to OFF position. Keep it at OFF position to per-
form troubleshooting.
Between controller pin 54 and CN-128M B
Between controller pin 54 and CN-122M B
Resistance
≤
1
Ω
4
Failure of con-
troller
No troubleshooting can be done due to internal failure. (Failure lies in the
controller if the reasons above are ruled out)
52
71
54
56
A
C
B
A
C
B
CN-122M
(
DF-3
)
CN-128M
(
DF-3
)
ZX215-1005119
CHASSIS HARNESS
SIGNAL
GND WIRE
ARM-IN
PRESS. SENSOR
GND WIRE
ARM-OUT
PRESS. SENSOR
5V
5V
SIGNAL
CONTROLLER
ARM-OUT
PRESS SENSOR
ARM-IN
PRESS SENSOR
SENOSR 5V
CAB
SENSOR GND WIRE
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