7 - Fault finding
7.5
Oil change interval not kept.
CONTROL/REMEDY
Tractor P.T.O. speed is lower than 540 r.p.m.
(reading failure on tractometer).
Wrong oil quality (foam).
Pump/motor is worn.
Change oil to fresh clean oil of correct quality.
No signal from speed sensor at the fan.
Blown fuse(s).
Drain hoses from motor/pump housing is
blocked.
PROBABLE CAUSE
Check tractor’s P.T.O. r.p.m.
Check tractometer.
Change oil to correct quality.
Get transmission checked by your HARDI dealer.
Leak on the pump suction line.
Check the wire connection between sensor and actuator for
damages.
Check power supply and fuse.
Check the drain hose(s) for bendings, damages and proper
attachment.
Hydraulic fan transmission
Max. revolutions cannot be obtained.
Noisy fan transmission.
Formation of foam in oil tank.
Check hydraulic pump suction line for leaks.
Fan speed will not stay at adjusted
level.
Fan r.p.m. control does not start up.
Oil leak from pump/motor shaft seal
(seal pressed out).
FAULT
Feed pressure too low.
Feed pressure too low.
Wrong oil quality (foam).
Bad / corroded electrical connections.
Too much pressure in pump/motor housing
(pump/motor worn).
Adjust feed pressure to correct setting.
Adjust feed pressure.
Change oil to correct quality.
Get transmission checked by your HARDI dealer.
Pump/motor is worn.
Oil filter is clogged (vacuummeter indicator
in the red area).
Mixture of hydraulic oil and other quality
(e.g. universal oil).
Get transmission checked by your HARDI dealer.
Change oil filter.
Change oil to correct quality.
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