7 - Fault Finding
93
Hydraulic System, Z-version
* Depending on scope of supply.
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 15 - 80 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.
To Next Page
Loading...
Need help?
General
