SANY LATIN AMERICA
7-77
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
E-10 Travel speed or power is low
Trouble
Travel speed or power is low during operation.
Related information
Pilot pressure of travel 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, left and right travel pressure
signals
Pressure
0 KG
Levers in operation, left and right travel 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 49 to CN-
120M A) and ground
Between harness (from controller pin 67 to CN-
121M 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-120M B Be-
tween controller pin 54 and CN-121M B
Resistance
≤
1
Ω
4
Failure of con-
troller
No troubleshooting can be done due to internal failure. (Failure lies in the con-
troller if the reasons above are ruled out)
A
C
B
A
C
B
67
49
54
56
CN-121M
(
DF-3
)
CN-120M
(
DF-3
)
ZX215-1005101
RIGHT TRAVEL
PRESS. SENSOR
LEFT TRAVEL
PRESS. SENSOR
5V
SIGNAL
GND WIRE
5V
SIGNAL
GND WIRE
CONTROLLER
RIGHT TRAVEL
PRESS SENSOR
LEFT TRAVEL
PRESS SENSOR
SENOSR 5V
SENSOR GND WIRE
CAB
CHASSIS HARNESS
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