SANY LATIN AMERICA
7-117
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
H-20 Swing acceleration poor or swing speed low
Trouble (1)
●
Swing acceleration is poor, 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 swing
motor (parking brake)
Parking brake of swing motor may have malfunction. Check it directly.
2
Improper adjustment
or malfunction of
swing motor (relief
valve)
●
Stop the engine. Perform troubleshooting while the engine is run-
ning at high idle.
Swing control lever
Swing relief valve
Swing relief
25.5~28.5 MPa
{260~291 kg/cm²}
If oil pressure does not become normal after adjustment, swing motor
relief valve may have malfunction or internal defect. Check the relief
valve directly.
3
Failure of swing mo-
tor
●
Stop the engine. Perform troubleshooting while the engine is run-
ning at high idle.
Swing control lever
Leakage from swing motor
Swing relief
≤
10 ml/min
4
Clogging of brake
control lines
Disassemble, clean and check.
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