Levelling - Kalmar DRF420-60S5 Maintenance Manual

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Condition
Control switch
Overloading system
7 Load handling – 7.8 Levelling
7.8
Mechanical levelling, function description
Mechanical levelling means that the attachment is angled in horizon-
tal direction. This enables the machine to handle loads on uneven
surfaces.
The attachment's main beam is located in the sideshift frame. The
clearance between the sideshift frame and the attachment's main
beam allows a movement of approx. 5° which makes it possible to
lift containers that lean in relation to the machine. It's the attach-
ment's dead weight that adapts the attachment's angle to the con-
tainer.
Hydraulic levelling, function description
Hydraulic levelling means that the sideshift frame is split and the
parts are connected with four hydraulic cylinders. Hydraulic levelling
increases mobility of the attachment. The hydraulic levelling has a
passive position where the attachment floats freely and an active
position where the angle can be controlled. Levelling can be locked
by blocking the connection to the levelling cylinders.
Passive levelling means that that an unloaded attachment is in a
float position and adapts itself to the angle of the container to be lift-
ed. The passive levelling transfers to active levelling as soon as the
attachment is loaded. Two pressure switches are activated when
the pressure on the levelling cylinders' rod sides becomes too high.
Active levelling means that levelling is controlled by pressurizing the
hydraulic cylinders. Levelling is controlled with the control lever.
Levelling is monitored by sequence valves that close when the feed
pressure is high enough to put all cylinders in bottom position.
Reference value
Not activated
Passive
Maintenance manual DRF 400–450
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Levelling

37
UDRF01.04GB