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8.6
Control unit
To check the functions and to operate the
control unit, please observe the assembly
and operating instructions for the dock level-
ler control.
Emergency off function
After the interruption of the power supply, all move-
ments of the dock leveller must be blocked. It must
be possible to secure the main switch against inad-
vertent switch-on, e.g. by means of a lock that is dir-
ectly positioned at the main switch. The restart lock is
active afterwards. If the main switch is now actuated
again, the "Lift" button must first be pressed so that
the dock leveller is ready for operation again.
Carry out a visual inspection of the condition and
fastening of the electrical cables and plugs.
8.7
Hydraulic unit
Checking the oil level
If the oil level of the hydraulic unit is too low, this will
lead to an increased oil temperature and faster oil
aging. The result are damages to the pump in the hy-
draulic unit.
optimal
Fig. 8: Oil level
Please refer to the separate document for
specifications on the optimum oil level: Ad-
justment instructions for the hydraulic system.
42 - EN
MIN
MAX
MIN
Changing the hydraulic oil
The quality of the hydraulic oil has a decisive effect
on the service life of the hydraulic unit. The mainten-
ance intervals depend on the intensity of use of the
dock leveller and should be performed more often
with an increased intensity of use. For this reason,
the oil quality should be checked at appropriate inter-
vals and, if necessary, the oil should be changed be-
fore the end of the interval as specified in the table.
The quality of the hydraulic oil can be assessed by
visual inspection.
If the following conditions occur, the oil is worn and
subject to premature oil aging and must be replaced:
•
Dark colouration, milky turbidity or bubble
formation
•
Burning odour
•
Contamination by foreign matter or suspended
particles
Use only hydraulic oils approved by the manufacturer
(see chapter 3.5 - Hydraulic system)!
For further information on changing the hy-
draulic oil see separate document: Adjust-
ment instructions for the hydraulic system.
8.8
Hydraulic hoses
All hydraulic hoses are subject to a recommended
service life of six years and should be replaced upon
expiry. Depending on the intensity of use of the dock
leveller, damages, leakages, signs of wear or corro-
sion on the hydraulic hoses, the recommended period
of use may also be considerably reduced.
The date of manufacture of the hydraulic hose can be
found on the hose fitting.
Replacing the hydraulic hoses
•
Move the dock leveller to its uppermost position.
•
Switch off the main switch and secure it against
switch-on.
•
Insert the maintenance support first at the top
and then at the bottom into the receptacle on the
dock leveller.
•
Switch on the main switch. Lower the dock
leveller.
•
Switch off the main switch and secure it against
switch-on. The hydraulic unit is blocked and the
hydraulic hoses are depressurised.
•
Make sure that the hydraulic system is
depressurised.
•
Dismantle the defective hydraulic hose and place
it in a suitable container to avoid oil
contamination.
•
Mount the new hydraulic hose and bleed the
system.
•
Check the oil level of the hydraulic unit and the
function of the dock leveller.
These assembly, operation and maintenance instructions must be kept for the entire period of use!
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