OPERATOR'S MANUAL MAINTENANCE

Section 3 - Maintenance
Routine Maintenance
Troubleshooting
3-105 3-105
9803/JSM-0412
Working Attachments
Table 50. Overall low power
Table 51. Defective operations
Table 52. Insufficient work power
Table 53. Attachment sinks down
Table 54. Abnormal noise from joints of the attachment
Cause Remedy
Insufficient engine output Refer to Engine Service Manual
Function drops due to wear of hydraulic pump
Replace hydraulic pump
(1)
Defective main relief valve
Adjust the pressure or replace
(1)
Low hydraulic oil Refill
Viscosity of hydraulic oil incorrect Replace with hydraulic oil of proper viscosity
Suction filter clogged Replace suction filter
Cause Remedy
Hydraulic pump broken
Replace hydraulic pump
(1)
Hydraulic oil low Replace suction filter
Cause Remedy
Set pressure for main or port relief valve is low or incorrect
Adjust pressure or replace relief valve
(1)
Damaged hydraulic ram seals
Replace hydraulic ram seals
(1)
Damaged hydraulic ram, cylinder
Replace hydraulic ram/cylinder or the assembly
(1)
Cause Remedy
Damaged hydraulic ram seals
Replace hydraulic ram seals
(1)
Damaged hydraulic ram, cylinder
Replace hydraulic ram/cylinder or the assembly
(1)
Oil leakage inside control valve
Repair valve assembly, replace
(1)
Oil leakage inside holding valve
Repair valve assembly, replace
(1)
(1) Indicates jobs which should be done by a specialist.
Cause Remedy
Insufficient grease Grease
Connecting pin seizure Replace the bushing and/or pin