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6. Lifting system
6.1 Normal type lifting system general description
Normal type lifting system is of two stage roller type with veritical up and down
moving. It is made up of inner mast, outer mast, two rear lifting cylinder and fork
brakcet.
6.2 Inner mast and outer mast
Inner mast and outer mast are welded parts. Refer to figure 6.1. The weight is
beared by frame. The middle part of the outer mast is connected with frame throught
tilting cylinder and it can tilt forward and backward under the action of tilting cylinder.
The steel channel of outer mast is of C type. There is one pair of combined roller on
top of the end. The steel channel of inner mast is of H type and there is one pair of
combined roller at the lower end. The inner mast keeps a fixed ralative position
between inner mast and outer mast during moving through main roller and side roller.
The maintenance of the roller and the side rollers on the inner and outer masts is
very important. Please be careful.
Combined roller
Outer mast
Main roller
Combined roller
Figure 6-1 inner mast and outer mast
82
Main roller
Inner mast
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