Zoomlion ZRT850, Руководство оператора

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Operator’s Manual for Rough Terrain Crane
7.13 MAIN BOOM EXTEND / RETRACT FUNCTION OPERATION
A. The boom has four parts to it: a basic boom and four telescopic sections. The basic
boom attaches to the superstructure with a pivot connection. The four telescopic
sections move together to increase the length / range of the boom.
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:

Telescopic cylinder

Boom extension wire-rope

Boom retraction wire-rope.
C. The figure below shows the telescoping principle:
Figure 7-11 Telescoping Principle
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 load moment indicator. The boom length data is
calculated then the boom configuration shows on the screen.
B
as
ic
Boom
Retraction
Telescopic
S
ti 1
Telescopic Section
2
Telescopic Section
4
Telescopic
Section 3
Telescopic
C li d I
Boom
Retractio
n
Wire Ro Boom
Extensi
on
Boom
Extension
Wire-Rope
Telescopic
Cylinder II
7-20 ZRT850 Rough Terrain Crane