
7 - Fault finding
67
Hydraulic system - Z model
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. 25 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.
Defect 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 (-).
Boom lift raises to max. position when tractor
hydraulics are engaged.
Wrong oil inlet to bypass block.
Connect hydraulic snap couplers opposite in tractor
outlets, or engage spool valve lever in opposite
direction.
Back pressure in return line exceeds 20 bar.
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.
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 ram does not move.
Clogged restrictor.
Dismantle and clean restrictor.
Содержание MASTER PRO VHH
Страница 6: ...Table of Contents 6 ...
Страница 8: ...1 EC Declaration 8 ...
Страница 12: ...2 Safety notes 12 ...
Страница 50: ...5 Operation 50 ...
Страница 52: ...6 Maintenance 52 Boom lubrication oiling plan Lift lubrication oiling plan ...
Страница 70: ...7 Fault finding 70 ...
Страница 76: ...8 Technical specifications 76 Charts Boom hydraulic Z ...
Страница 77: ...8 Technical specifications 77 Boom hydraulic Y A Option for slanting B Option for single side folding VHH only ...
Страница 78: ...8 Technical specifications 78 ...
Страница 82: ...HARDI INTERNATIONAL A S Helgeshøj Allé 38 DK 2630 Taastrup DENMARK ...