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§5.6 - The electric motor M in the hydraulic power pack doesn't switch off, when the UP button is released.
• The button or switch for LIFT in the wander lead doesn't return to the neutral 0-position.
• The button or switch returns to 0-position, but one of the electric contacts behind the switch
is stuck or burnt.
• Short circuit between the various wires in one of the electrical cables.
• The contacts of the starter solenoid R are burnt and remain activated.
§5.7 - The lift capacity is insufficient, the HTL doesn't reach the full nominal capacity.
• The load is too heavy, or removed too far from the centre of gravity.
• The pressure relief valve PV is set too low.
• The pressure relief valve PV is polluted or mechanically blocked in open position.
• The pump P sucks insufficient oil: the oil or filter are polluted, clogged up with ice or dirt, or
the oil is too viscous (after refilling with oil of incorrect specifications).
• The hydraulic pump P is worn out.
• The seal of one of the lift cylinders is leaking.
§5.8 - The electric motor M in the hydraulic power pack seemingly runs at normal speed, but the platform doesn't move
• Insufficient quantity of oil in the reservoir. The hydraulic pump P sucks air.
• The oil filter between the reservoir and pump is clogged up (dirt or ice formation).
• The drive shaft between the electric motor M and the hydraulic pump P is broken.
• The hydraulic pump P is completely worn out.
• The seal of one of the lift cylinders is leaking.
DHOLLANDIA
EN
Remove the connectors of the control power to the starter solenoid R: (if this action doesn't remove the fault, the starter
solenoid is burnt and remains activated).
If the fault lies with the control circuit: uncouple the auxiliary controls to narrow down the scope.
Measure the electrical distribution block in the power pack, and repair the electric fault.
If the control circuit isn't at fault, switch off the power relay Rbat in the power pack (or cut the power in a different way,
e.g. remove the main battery fuse) and replace the starter solenoid R.
Check the battery voltage , when the system is under load (push the function LIFT). Insufficient battery voltage
(doorbelling) is a frequent cause of starter solenoid failure !!
Fit a pressure gauge to the power pack, and measure the maximum pressure delivered by the pump P.
If set too low, try to adjust the pressure relief valve PV (to max. 220 bar, and only as far as required).
If the adjustment of the pressure relief valve PV doesn't show any result, try first to purge this valve, or replace it.
If no result, dismount the oil filter and clean it (dirt or ice when freezing).
If also without result, the pump P is probably worn out. (A worn out pump heats up quickly).
If the oil pressure can be raised, but the lift capacity remains insufficient, check for visible, significant oil leaks at the head
of the lift cylinders.
Verify the oil level in the power pack, and top-up oil if necessary. The max. oil level reaches to 30mm below the fill-up
inlet when the platform is at the ground. The min. oil level reaches to 40mm above the under side of the reservoir when
the platform is closed.
Dismount the filter and clean it. Replace the filter if a complete rinse is not possible.
Feel the temperature of the pump P (a worn out pump heats up quickly).
Dismount the pump P off the electric motor M, and verify the condition of the drive shaft.
Test and verify the tightness of the hydraulic cylinders.
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