SANY LATIN AMERICA
7-100
SY195/205/215/225C9 Crawler Hydraulic Excavator
Troubleshooting
Shop Manual - June 2013
H-4 Abnormal noise in hydraulic pump
Trouble
●
Abnormal noise is produced from the hydraulic pump
Related information
―
Possible causes and standard value in normal
state
Cause
Standard value in normal state/Remarks on troubleshooting
1
Low level of
hydraulic oil
Make a visual check.
2
Inferior hydrau-
lic oil
Hydraulic oil probably contains air. Make a visual check.
3
Clogging of
vent on top of
hydraulic tank
It is probably the clogging of the vent on top of the hydraulic tank that
causes negative pressure in the hydraulic tank. Press the release button of
the breather valve to eliminate air. Check again if the noise disappears.
4
Clogging of
hydraulic tank
strainer
It is probably the clogging of hydraulic tank strainer that causes negative
pressure in the oil suction line. Make a visual check.
5
Failure of main
pump
The main pump may have internal defect. Check the main pump.
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