SANY LATIN AMERICA
7-116
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
Trouble (2)
●
Upper structure only fails to swing in one direction.
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.
Left control lever
Pilot valve output pressure
"NEUTRAL"
0 {0}
Swing
≥
3.5MPa {
≥
36 kg/cm²}
2
Malfunction of swing
control valve (spool)
Spool of swing control valve 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 directly.
●
Failure of the seal can be determined by swapping the right and left
makeup valves and check for any changes.
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