7 - Fault finding
7.3
Hydraulic system - HZ model.
FAULT PROBABLE CAUSE CONTROL/REMEDY
No boom movements when activated. Insufficient hydraulic pressure. Check output pressure of tractor hydraulics. Minimum
for sprayer is 2000 psi (130 bar).
Insufficient amount of oil in tractor reservoir. Check and top if needed.
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 10 awg. (4mm²) for
power supply.
Defective relay / diodes in junction box. Check relays, diodes and soldering at PCB in junction
box.
Restrictor blocked. Secure boom. Dismantle and clean. Change hydraulic
oil & filter.
Ram not functioning. Restrictor blocked. Secure boom. Dismantle and clean. Change hydraulic
oil & filter.
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(es).
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.
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