TROUBLESHOOTING
OVERALL MACHINE
V-6TB53FR
4. Inspect the main relief valve.
Measure the relief pressure of the main relief
valve.
• The valve is normal if the pressure gauge
reading is the standard value.
“ II. Specifications, Standards for Judging
Performance”
If the main relief valve’s set pressure is too low,
adjust it by tightening the valve set screw gradu-
ally.
• If the pressure doesn’t rise after 1/4 turn of the
screw, the main relief valve is faulty.
5. Pump is faulty.
If the pump is abnormally worn internally, or if it
is damaged, it is possible that pieces of metal are
mixed into the hydraulic oil. Therefore, carry out
the following treatment.
• Replace the spin filter cartridge.
• Replace the hydraulic oil or flush out the
hydraulic circuit.
(Up to NAS Class 9)
Caution : When replacing the hydraulic oil, be
sure to clean the inside of the Hydraulic Tank and
the suction strainer.
“III. Machine Configuration, Hydraulic
Tank”
If the pump seal is damaged, replace the seal.
“IV. Hydraulic Units, Hydraulic Pump”
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