Hydraulic System, Z-Version - Hardi COMMANDER DELTA FORCE Instruction Book

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 Centre systems.
Individual hydraulic piston does not move.
190
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 15 bar.
Bypass valve does not close properly.
Internal leaks in flow regulator.
Clogged restrictor.
CONTROL / REMEDY
Check oil pressure.
Check tractor hydraulic oil level.
Oil flow must be 15 - 80 l/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 4 mm 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 (-).
Connect the return line with a free flow to hydraulic
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.