Zoomlion RT75, Operator'S Manual

Page: 119 / 178

RT75 Rough Terrain Crane
07 - 29

Winch spool-up

Boom extension

Boom derrick-down
If you must extend the boom more, use the reel-off function (right joystick forward)
to lower the hook block.
The crane has a bypass key switch that prevents the warning indications. When the
maintenance personnel repair or check out the functions on the crane, they can turn
the bypass key switch.
G. Operate
–
retract the boom
(a) Make sure the seat occupied and activat the pedal to retract the boom.
(b) Tilt the pedal backward to retract the telescopic sections 1, 2 and 3. Refer to
Figure 07
–
22.
Figure 07
–
22 Telescopic Sections - Retract
(c) Release the pedal slowly to the neutral position to stop the telescoping movement.
The boom stops at that point.

When you extend and retract the boom, the hook block moves up and down.
Make sure that you adjust the length of the hoist wire-rope when you adjust the
length of the boom. Do not extend the boom too quickly.

The speed of the extend and retract movements change by:

The extend / retract pedal - how far you tilt it

Throttle pedal - increase or decrease the engine RPMs.

When the boom is fully retracted, it can be two seconds before the boom starts
to move.

Lift the load vertically. Do not try to lift the load diagonally. Do not pull a load
across the ground.

Do not use the bypass key switch when you do usual crane operations.

An extended boom can retract a short distance if the boom is extended for a
Caution