SANY LATIN AMERICA
7-73
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
E-7 Boom-raise speed or power is low
Trouble
Boom-raise speed or power is low.
Related information
Pilot pressure of the boom in operation can be
checked on the monitor.
Possible causes and standard value in nor-
mal 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, boom-raise pressure signal
Pressure
0 KG
Lever in operation, boom-raise pressure signal
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 70 to CN-126M
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-126M 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)
CN-126M
(
DF-3
)
A
B
C
56
54
70
ZX215-1005099
CHASSIS HARNESS
CAB
BOOM UP
PRESS. SENSOR
SIGNAL
5V
GND WIRE
CONTROLLER
SENSOR 5V
SENSOR GND WIRE
BOOM UP
PRESSURE SENSOR
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