5-5
5
OVERALL MACHINE
TROUBLESHOOTING
4. Check the main relief valve.
Measure the relief pressure of the main relief valve.
• If the measured value is within specifications, the
valve is normal.
“2. Service data, Performance criteria”
If the pressure of the main relief valve is low, adjust
it to the set pressure by gradually tightening the set-
scr
ew.
• If the pressure does not increase after tightening the
setscrew by 1/4 turn, the relief valve is faulty.
5. Piston pump is faulty.
If the inside of the pump is excessively worn or dam-
aged,
it is likely that metal pieces are in the hydraulic
oil. If this is the case, do the following.
• Replace the elements of the line filter and the spin
filter.
• Replace the hydraulic oil or perform flushing.
• When replacing the hydraulic oil, clean the tank and
the suction strainer.
“4. Disassembly and assembly, Piston pump”
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