SANY LATIN AMERICA
7-118
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
Trouble (2)
●
Swing acceleration is only poor on one side, or swing speed 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 pilot
valve
●
Stop the engine. Perform troubleshooting while the engine is run-
ning at high idle.
Swing control lever
Pilot valve output pressure
"NEUTRAL"
0 {0}
Left swing
Right swing
≥
3.5MPa {
≥
36 kg/cm²}
2
Malfunction of swing
motor (pressure com-
pensation valve)
Pressure compensation valve of swing motor may have malfunction.
Check it directly.
3
Defective seal of swing
motor (makeup valve)
Seal of makeup valve in swing motor may have defect. Check it di-
rectly.
●
Swap the left and right makeup valves and observe the result in
order to determine whether the seal fails.
4
One-side leakage of
swing pilot pressure
sensor (shuttle valve)
●
Stop the engine. Perform troubleshooting while the engine is run-
ning at high idle.
Swing control lever
Pilot valve output pressure
"NEUTRAL"
0 {0}
Left swing
Right swing
3.5~3.9MPa {36~40 kg/cm²}
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