Doka Shifting trolley DF Mode d'emploi original - Page 12

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Troubleshooting

Load not being lifted
Possible causes:
▪
Load too heavy (> 1500 kg, including Stacking
frame)
▪
Not enough hydraulic oil
▪
Mechanical guide mechanisms are damaged or are
tending to get jammed
▪
Hydraulic pump is faulty
▪
Overpressure valve is wrongly adjusted or faulty
▪
Manual lowering valve is leaking (e.g. due to con-
taminated oil)
Load not being completely lifted
Possible cause:
▪
Not enough hydraulic oil
The load is being lowered of its own
accord
Possible causes:
▪
Load too heavy (> 1500 kg, including Stacking
frame)
▪
Hydraulic tubing is leaking
▪
Overpressure valve is wrongly adjusted or faulty
▪
Non-return valve on electrical hydraulic pump is
leaking
▪
Manual lowering valve is leaking (e.g. due to con-
taminated oil)
▪
Hand-pump valves are leaking
The load cannot be lowered
Possible causes:
▪
Low ambient temperatures (hydraulic oil is too vis-
cous)
▪
Flow control valve is blocked (e.g. due to contami-
nated oil)
▪
Manual lowering valve is defective
▪
Isolation valve is defective
The load is being lifted jerkily and/or
"bounces"
Possible causes:
▪
Trapped air in the hydraulic tubing and/or the
hydraulic cylinder
▪
Mechanical guide mechanisms are damaged or are
tending to get jammed
12
Original Operating Instructions Shifting trolley DF
The hydraulic lines of the Attachable
drive unit DF cannot be connected or
disconnected (quick-acting coupling)
Possible causes:
▪
High pressure in the hydraulic system of the Shifting
trolley DF
▪
High pressure in the hydraulic system of the Attach-
able drive unit DF
▪
Residual soiling on coupling components
▪
Quick-acting coupling is faulty
Electrical hydraulic pump not
pumping
First try out whether it is possible to use the pump in
manual mode. If it is, then there are the following
Possible causes:
▪
Problems with the electric power supply
▪
Not enough hydraulic oil
▪
The ON button is faulty
▪
The electric motor is faulty (e.g. capacitor)
▪
Mechanical breakage (gear pump, coupling)
▪
Damaged pump seals
Hydraulic hand-pump is not
functioning
Possible causes:
▪
Not enough hydraulic oil
▪
Breakage in the mechanical drive system (levers,
articulated joints, pistons)
▪
Damaged or worn-out seals in the pump system
▪
Mechanical breakage (gear pump, coupling)
▪
Pump valves leaking
999216002 - 02/2020