Kalmar DRD450-80S4X, Maintenance Manual

Page: 158 / 600

UDRF01.04GB
Maintenance manual DRF 400–450
10 7 Load handling – 7.3 Protruding
7.3 Protruding
page –
Extension, function description
Extension means to push the inner boom in and out in the outer
boom. The inner boom is pushed in and out by the extension cylinder
which is pressurized by Control valve lift, lower and extension. Ex-
tension is controlled with Control lever (S815).
Damping
Damping means that the speed of functions is reduced automatical-
ly near the end-positions. This results in less stress on the mechan-
ical parts when stopping in the end-positions.
Position sensors sense when damping should be activated. When
damping is activated, the control unit in question reduces the con-
trol current to the solenoid valve for that function.
Regeneration
To increase the extension speed, oil from the rod side (2) is reused
to the piston side (1), this is called regeneration. Engagement of re-
generation is controlled by the control system.
001110
000455
1 2
Condition Reference value
Control switch Not activated
Overloading system Boom out: passive
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