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Operator’s Manual for Crawler Crane
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4-49
The components of derricking mechanism will be described in the table 4-16.
Table 4-16 Components of derricking mechanism
No.
Names of the components
1
Anchoring rods
2
Derricking traveling block
3
Derricking crown block
4
A-frame assy.
5
Derricking rope
6
Main boom
7
Main boom tilting-back support
b) Operation of derricking mechanism under different boom configurations
Move right control lever to left, spool up derricking winch to raise boom.
Move right control lever to right, reel off derricking winch to lower boom.
1) Main boom configuration
Main boom angle can vary from 0
°
to 84
°
under self-assembly & dismantling
condition, while main boom angle can vary from 0
°
to 82.5
°
under any other working
condition. And derricking winch is used to control main boom.
2) Main boom with fixed jib configuration
The fixed jib can be mounted in the angle of either 10
°
or 30
°
to main boom. Once the
angle is set, it can not be changed during operation.
The main boom can be raised and lowered via derricking winch. The angle between
the fixed jib and main boom can not be changed.
3) Ratchet wheel mechanism
Derricking winch is fitted with a brake and a ratchet wheel mechanism. The derricking
winch can be locked by ratchet wheel if the crane does not work for a long time so
that the boom can be placed at anywhere. The ratchet pawl is controlled by derricking
ratchet pawl switch (No.5 in the figure 4-8).
Figure 4-44 Ratchet wheel mechanism of derricking winch
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