Hydraulic System - Z Model; Hydraulic System - Y Model - Hardi COMMANDER TWIN FORCE Instruction Book

Hydraulic system - Z model

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 ram does not move.

Hydraulic system - Y model

FAULT
Boom slow/eradic.
Ram not functioning.
Hydraulic system fold/tilt functions will not operate. Power supply.
One function (fold or tilt) will not operate.
Multiple hydraulic functions with one switch
activated.
PROBABLE CAUSE
Insufficient hydraulic pressure.
Insufficient oil supply.
Blown fuse(s).
Bad / corroded electrical connections.
Insufficient power supply.
Defect 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.
PROBABLE CAUSE
Air in system.
Regulation valve incorrectly set.
Insufficient hydraulic pressure.
Insufficient amount of oil in tractor reservoir.
Restrictor or regulation valve blocked.
Various.
Various.
7 - Fault finding
CONTROL/REMEDY
Check oil pressure.
Check tractor hydraulic oil level.
Oil flow must be min. l/min. and max. 130 l/min.
Check tractor hydraulic oil level.
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 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.
CONTROL/REMEDY
Loosen ram connection and activate hydraulics until
oil flow has no air in it (not whitish).
Open or close until desired speed is achieved
(clockwise = less speed).
Remember oil must be at operating temperature.
Check output pressure of tractor hydraulics. Minimum
for sprayer is 170 bar.
Check and top if needed.
Secure boom. Dismantle and clean.
Check for proper 12V power supply.
Check for defective switch(s).
Check continuity of cables.
Check for operation of applicable solenoid (coil not
activating or plunger stuck).
Check for short circuit in wiring junction box at rear of
sprayer.
Dirt in the restrictor port of the cylinder.
Check for correct solenoid electric/hydraulic hook-up.
Check for short circuit in wiring in the junction box at
rear of sprayer.
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