Zoomlion RT100 - Main Boom Extend; Retract Function Operation

RT100 Rough Terrain Crane 07 -
23
7.14 MAIN BOOM EXTEND / RETRACT FUNCTION OPERATION
A. The boom has five parts to it: a basic boom and four telescopic sections. The basic boom
section attaches to the superstructure with a pivot connection. The four telescopic
sections move together to increase the length / range of the boom. Refer to Figure 7 –
18.
B. To extend and retract the boom, a telescoping mechanism is attached in the boom
structure. The components of the telescoping mechanism are as follows:


Telescoping cylinder


Boom extension wire-rope


Boom retraction wire-rope.
C. The figure below shows the telescoping principle:
Figure 07 – 18 Telescoping Principle
1. Telescoping Cylinder I
2. Telescoping Cylinder II
3. Boom Extension Wire-Rope
4. Boom Retraction Wire-Rope
5. Boom Extension Wire-Rope
6. Boom Retraction Wire-Rope
D. The balance valve, in the hydraulic system, helps the telescoping components move
smoothly. When the boom is set the correct length, the valve causes a blockage of the
hydraulic oil flow out of the cylinder. This helps to lock the boom in position.
E. The length detector (in the main boom, on the left side) measures the boom length and
transmits the data to the rated capacity indicator. The boom length data is calculated
then the boom configuration shows on the screen.