Hardi NAVIGATOR 4000, Instruction Book

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7 - Fault finding
97
Hydraulic System, Y-boom version
Hydraulic System, Z-boom version
FAULT PROBABLE CAUSE CONTROL/REMEDY
Boom slow/eradic. Air in system. Loosen ram connection and activate hydraulics until
oil flow has no air in it (not whitish).
Regulation valve incorrectly set. Open or close until desired speed is achieved
(clockwise = less speed).
Remember oil must be at operating temperature.
Insufficient hydraulic pressure. Check output pressure of tractor hydraulics. Minimum
for sprayer is 170 bar.
Insufficient amount of oil in tractor reservoir. Check and top if needed.
Ram not functioning. Restrictor or regulation valve blocked. Secure boom. Dismantle and clean.
Hydraulic system fold/tilt functions will not operate. Power supply. Check for proper 12V power supply.
One function (fold or tilt) will not operate. Various. 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.
Multiple hydraulic functions with one switch
activated. Various. Check for correct solenoid electric/hydraulic hook-up.
Check for short circuit in wiring in the junction box at
rear of sprayer.
FAULT PROBABLE CAUSE CONTROL/REMEDY
No boom movements when activated. Insufficient hydraulic pressure. Check oil pressure.
Check tractor hydraulic oil level.
Insufficient oil supply. Oil flow must be min. l/min. and max. 130 l/min.
Check tractor hydraulic oil level.
Blown fuse(s). Check / replace fuse in junction box.
Bad / corroded electrical connections. Check / clean connections, multi plugs etc.
Insufficient power supply. Voltage on activated solenoid valve must be more
than 8 volts.
Use wires of at least 4 mm for power supply.
Defective relay / diodes in junction box. Check relays, diodes and soldering at PCB in junction
box. LED diodes indicate boom functions.
Clogged restrictors in bypass block. Remove and clean restrictors in bypass block (See
hydraulic diagram). Change hydraulic oil + filter.
Wrong polarity. Check polarity. Red positive (+), black negative (-).
ParaLift lock does not lock.
Boom lift raises to max. position, when tractor
hydraulics are engaged.
Back pressure in return line exceeds 15 bar. 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.
Oil heats up in Closed Centre systems. Bypass valve does not close properly. Check / close (screw in) by-pass valve.
Internal leaks in flow regulator. Replace flow regulator O-rings and backup rings.
Replace flow regulator.
Individual hydraulic piston does not move. Clogged restrictor. Dismantle and clean restrictor.