Troubleshooting 2
33
2 Troubleshooting
Note 1 Air suction of suction pipe
1) Hydraulic performance will notably degrade.
2) Unusual noise will sound in relief sound at actuation of hydraulic circuit.
3) Slight vibration can be sensed if touched the hydraulic pipe with fingers.
4) Set the control valve in neutral with the lift arm in the lower limit position and press down the lift arm to
function. (Cushion by air can be felt.)
5) T/M oil will be dirty.
6) The pointer of the pressure gauge will swing largely.
Note 2 Phenomenon at oil filter clogging
1) Hydraulic operation will become uneven and start stopping.
2) When excessive clogging, it will not function at all.
3) It will function at initial stage of operation but stop functioning when foreign matters in the oil start
clogging the filter. If stopped the engine and restarted the operation after a while, it will function but will
stop shortly. This is because of the precipitation of clogged matters in the filter. It is often misunderstood as
a trouble caused by increase of the hydraulic pressure due to its correspondence to the increase of the
hydraulic pressure.
Condition Causes (Checked Place) Measures Remarks
1. Unusual noise in hydraulic
circuit
• Insufficient oil (T/M oil) • Supply up to specified
amount.
HST:
32L{8.5gal}
GEAR:
29L{7.7gal}
• Sound of cavitation due to excessive
resistance to suction
• Fix the failure valves.
• Change filter.
2. Hydraulic pressure (lift arm)
cannot be lifted.
• Insufficient oil (mission oil) • Supply up to specified
amount.
HST:
32L{8.5gal}
GEAR:
29L{7.7gal}
• The air is sucked from suction pipes. • Retighten the filter case and
mounting part and change if
any cracks on pipe or
damage on O-ring.
(Note 1)
• Oil leakage from seal
• Clogging of hydraulic filter • Change (Note 2)
• Hydraulic pump failure • Repair
• Control valve failure • Repair
• Cylinder failure • Change
3. There is an oil leakage. • Looseness of each joint • Retighten
• Cracks on pipe • Change
• Cut of O-ring • Change
4. When lifting the hydraulic
lever, relief valve will sound
"Beep".
• Adjustment failure at stopper position • Repair
5. Lift arm cannot be lifted. • Lowering speed-adjusting grip is set
locked.
• Position for lowering
• Control valve failure • Repair
• Cylinder failure • Change
• Rotating part of lift shaft is seized. • Repair
• Valve lowering spring failure • Change
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