SANY LATIN AMERICA
7-112
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
H-16 Machine is not steered well or steering power is low
Trouble
●
Machine is not steered well or steering power is low
Related information
●
Set working mode to (S) and fuel control dial at position (10) to
carry out troubleshooting.
Possible causes and standard value in normal state
Cause
Standard value in normal state/Remarks on troubleshooting
1
Malfunction of travel pilot
valve
●
Stop the engine. Perform troubleshooting while the engine is
running at high idle.
Travel control lever
Pilot valve output pressure
Both sides in "NEUTRAL"
0 {0}
Either side operated
3.5~3.9 MPa
{ 36~40 kg/cm²}
2
Malfunction of travel pilot
pressure sensor
●
Stop the engine. Perform troubleshooting while the engine is
running at high idle.
Travel control lever
Solenoid valve output pressure
Both sides operated
3.5~3.9 MPa
{ 36~40 kg/cm²}
Either side operated
3.5~3.9 MPa
{ 36~40 kg/cm²}
3
Malfunction of travel
control valve (spool)
Spool of travel control valve may have malfunction. Check it direct-
ly.
4
Malfunction of travel
control valve (makeup
valve)
The makeup valve in travel control valve may have malfunction.
Check it directly.
5
Failure of travel motor
(relief valve)
Seal of relief valve in travel motor may be defective. Check it di-
rectly.
●
The failure of seal can be determined by swapping the front
and back motors or the left and right motors.
6
Failure of travel motor
(check valve)
Seal of check valve in travel motor may be defective. Check it di-
rectly.
●
The failure of seal can be determined by swapping the front
and back motors or the left and right motors.
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