Lifting/Lowering - Kalmar DRF420-60S5 Maintenance Manual

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Control switch

Overloading system

7 Load handling – 7.2 Lifting/lowering

Lift and lower, function description

Lift and lower means to angle the boom up and down so that the at-

tachment is lifted and lowered. The lift boom is angled with two lift

cylinders that are pressurized by Control valve lift, lower and exten-

sion. The lift function is controlled with Control lever (S815).

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 speed, oil from the rod side (2) is reused to the piston

side (1), this is called regeneration. Engagement of regeneration is

controlled by the control system.

Reference value

Not activated

Locked or unlocked, not intermediate position

Boom up: passive

Boom down: passive or by-pass activated

Boom down: no alignment

Maintenance manual DRF 400–450

https://www.forkliftpdfmanuals.com/

Lifting/lowering

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