Troubles Shooting 6-3
Characteristics of faults
Cause
Remedy
Arm lifting force or bucket
digging up force inadequate
Wear or damage of cylinder oil seal
Replace oil seal
Distribution valve excessively worn.
Fit clearance between valve stem
and valve body exceeds the specified
value
Disassemble, check and repair
to make the clearance meet
requirements on specified value , or
replace distribution valve
Oil leakage in pipeline system
Locate the leakage point and repair
Severe internal leaking of working
pump
Replace working pump
Improper adjustment of safety valve,
and system pressure too low
Adjust the system pressure to the
specified value
Oil suction pipe and oil filter blocked
Clean oil filter and change oil
Bucket or arm rises slowly
even at high speed of engine
See above
See above
Dual action safety valve blocked
Disassemble the dual action safety
valve to check
HYDRAULIC SYSTEM FOR WORKING DEVICE
Summary of Contents for HL630VL
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Page 61: ...2 10 Operation Controls Schematic Fig 11 ...
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Page 126: ...Inspection Maintenance and Adjustment 4 7 LUBRICATION OIL AND MAINTENANCE CHART Figure 4 ...
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