SANY LATIN AMERICA
7-114
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
H-18 Travel system fails (only at one side)
Trouble
●
One side of the tracks cannot make a turn.
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
Defective seat of travel
control valve (makeup
valve)
Seat of makeup valve in travel control valve may have malfunction.
Check it directly.
2
Defective seat of travel
motor (relief valve)
Seat of relief valve in travel control valve may have malfunction.
Check it directly.
3
Defective seat of travel
motor valve (makeup
valve)
Seat of check valve in travel motor valve may have malfunction.
Check it directly.
4
Speed of travel motor
drops.
●
Stop the engine. Perform troubleshooting while the engine is run-
ning at high idle.
Travel control lever
Leakage from travel motor
Travel relief
27.2 ml/min
5 Failure of
fi
nal drive
Final drive may have internal defect. Check it directly.
●
Internal defect of final drive can be determined with abnormal
noise, overheat, and metal powder or debris contained in the oil
drained.
6
Defective pilot pressure
sensor
●
Stop the engine. Perform troubleshooting while the engine is run-
ning at high idle.
Travel control lever
Pilot valve output pressure
Forward
Reverse
3.5~3.9MPa
{ 36~40 kg/cm²}
Difference occurs between left and
right output
0.4 MPa {4 kg/cm²}
Check it with swapping method.
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