7 - Fault finding
75
Hydraulic functions - Z boom
FAULT PROBABLE CAUSE VERIFICATION/SOLUTION
No hydraulic response from the boom. Insufficient hydraulic pressure. Check the oil pressure.
Check the tractor's hydraulic oil level.
Insufficient oil flow. The flow must be at least 25l/min., with a max. of
130l/min.
Check the tractor's hydraulic oil level.
Blown fuse(s). Check/replace the connection box fuse.
Oxidised/poorly connected electrical plugs. Check/clean all connections, plugs, etc.
Insufficient supply. The electro valves require at least 8 volts.
Use at least 4mm cables for the power supply.
Defective relays/diodes in the connection box. Check relays, diodes and solder joints on the printed
circuit board in the connection box. LEDs indicate the
operation of the boom.
Blocked restrictors a or b in the bypass block. Disassemble and clean restrictors a and b (see
hydraulic system diagram). Replace hydraulic oil and
filter.
Incorrect polarity. Check polarity. Red positive (+), Black negative (-).
The boom rises to the max. when the tractor control
valves are under pressure.
Poor flow of oil into the hydraulic block. Reverse the direction of the hydraulic feed in the pipes
or reverse the direction of the tractor valve lever.
Return pressure greater than 20 bar. Connect the free return to the tractor's oil reservoir.
Split the return in two and route each one to the
reservoir via two valves.
The oil is heated in closed centre systems. Bypass valve 0 does not close properly. Check/close (screw) valve 0.
Internal leak in the flow regulator. Replace regulator gaskets and contact washers.
Replace the regulator.
A cylinder is not working. Blocked restrictor. Disassemble and clean the restrictor.
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