SANY LATIN AMERICA
7-99
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
H-3 Work equipment, swing, and travel systems do not work
Trouble
●
Whole work equipment, swing, and travel systems do not work.
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
relief solenoid valve
●
Stop the engine. Perform troubleshooting while the engine is run-
ning at high idle.
Pilot lockout control lever
Pilot relief pressure
LOCKED
0 {0}
FREE
3.9~4.1 MPa
{40~42 kg/cm²}
2
Failure of relief valve
(pilot pump)
●
Stop the engine. Perform troubleshooting while the engine is run-
ning at high idle.
Control lever
Pilot relief pressure
All levers in "NEUTRAL"
3.9~4.1 MPa
{40~42 kg/cm²}
3
Failure of hydraulic
pump
The main pump may have malfunction or internal defect. Check it by
following method.
●
Remove the oil pressure measurement plug and start the engine. If
oil
fl
ows out of the opening, the piston pump is in good condition.
4
Failure of coupling
Internal failure of the coupling can stop rotation of the pump shaft.
Check the coupling.
●
Loosen the oil delivery line of the pilot pump. If no oil is seen, it is
probably the failure of coupling.
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