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7 - Fault Finding
Hydraulic System, Z-version
FAULT
No boom movements when activated.
ParaLift lock does not lock.
Boom lift raises to max. position, when tractor
hydraulics are engaged.
Oil heats up in Closed Center systems.
Individual hydraulic piston does not move.
TWIN System - Blower
FAULT
Max. revolutions cannot be obtained.
Noisy blower transmission.
Formation of foam in oil tank.
Blower speed will not stay at adjusted level.
Blower speed control does not start up.
Oil leak from pump / motor shaft seal (the seal is
pressed out).
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PROBABLE CAUSE
Insufficient hydraulic pressure.
Insufficient oil supply.
The operator has interrupted the boom folding by
releasing the folding button in the tractor for more
than 30 seconds. A built-in timer automatically
removes the oil pressure in the yaw dampers 30
seconds after activating a folding button.
Blown fuse(s).
Bad / corroded electrical connections.
Insufficient power supply.
Defective relay / diodes in junction box.
Clogged restrictors in bypass block.
Wrong polarity.
Back pressure in return line exceeds 220 psi (15 bar). Connect the return line with a free flow to hydraulic
Bypass valve does not close properly.
Internal leaks in flow regulator.
Clogged restrictor.
PROBABLE CAUSE
Tractor's PTO speed is lower than 1000 rpm
(reading failure on tractor meter).
Feed pressure too low.
Pump/motor is worn.
Wrong oil quality (foam).
Feed pressure too low.
Oil filter is clogged (pressure gauge indicator is in
the red area).
Pump/motor is worn.
Wrong oil quality (foam).
Mixture of hydraulic oil and other oil quality (e.g.
universal oil).
Oil change interval not kept.
Leak on the pump suction line.
No signal from speed sensor at the blower.
Bad / corroded electrical connections.
Blown fuse(s).
Drain hoses from motor / pump housing is blocked.
Too much pressure in pump/motor housing (pump
/ motor worn).
CONTROL / REMEDY
Check oil pressure.
Check tractor hydraulic oil level.
Oil flow must be 7-24 gal/min (depending on the
equipment on the sprayer).
Check tractor hydraulic oil level.
Unfold the boom completely. Start folding again
without letting go of the activated folding buttons
for more than 30 seconds at a time, until the folding
is completed.
Check / replace fuse in junction box.
Check / clean connections, multi plugs etc.
Voltage on activated solenoid valve must be more
than 8 volts.
Use wires of at least 10 awg. for power supply.
Check relays, diodes and soldering at PCB in junction
box. LED diodes indicate boom functions.
Remove and clean restrictors in bypass block (See
hydraulic diagram). Change hydraulic oil + filter.
Check polarity. Red positive (+), black negative (-).
oil reservoir.
Divide return line in two and lead return oil back to
reservoir via two spool valves.
Check / close (screw in) by-pass valve.
Replace flow regulator O-rings and backup rings.
Replace flow regulator.
Dismantle and clean restrictor.
CONTROL / REMEDY
Check tractor's PTO speed (rpm).
Check tractor meter.
Adjust feed pressure to correct setting.
Get transmission checked by your HARDI® dealer.
Change oil to correct quality.
Adjust feed pressure.
Change oil filter.
Get transmission checked by your HARDI® dealer.
Change oil to correct quality.
Change oil to correct quality.
Change oil to fresh, clean oil of correct quality.
Check hydraulic pump suction line for leaks.
Check the wire connection between sensor and
actuator for damages.
Check power supply and fuse.
Check the drain hose(s) for bends, damages and
proper attachment.
Get transmission checked by your HARDI® dealer.
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