SANY LATIN AMERICA
7-97
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
H-1 Work equipment speed slow, or swing and travel speeds slow
Trouble
●
Work equipment speed is slow or the travel and swing speeds
are slow.
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
adjustment or
malfunction
of main relief
valve
●
Stop the engine. Perform troubleshooting while the engine is running at
high idle.
Control levers
Main relief pressure
Arm in
33~34.3 MPa
{337~350 kg/cm²}
If normal pressure cannot be restored after adjustment, it is possible the fail-
ure of main relief valve or internal defect. Check the valve directly.
2
Malfunction
of pilot relief
valve
●
Stop the engine. Perform troubleshooting while the engine is running at
high idle.
Control levers
Pilot control pressure
All levers in "NEUTRAL"
3.9~4.1 MPa
{40~42 kg/cm²}
3
Malfunction of
regulator
The regulator possibly fails. Check the servo mechanism of the regulator.
4
Malfunction of
main pump
If the trouble is caused by other factors, it might be the main pump that has
performance deterioration, malfunction or internal defect.
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