Specifications
88
8. Lifting system
8.1 General description
The lifting system is of two-stage, rolling telescopic mast type. The inner mast
frames have J-shaped section. The outer mast frames have C-shaped section. The
masts of forklift trucks all contain a free lift range. The structure of the mast sees Fig.
8.1.
8.2 Inner & outer mast
The mast assembly is of the free lift range-contained two stage telescopic type
consisting of the inner and outer mast, and is sustained by mast supports. The mast
supports are welded to the bottom of the outer mast, being extended from the axle
housing. The outer masts are provided with brackets for lock pins of tilt cylinder
connecting hardware. The mast is tilted by operation of the tilt cylinders.
The inner mast is composed of right and left mast frames which are connected
with each other by upper and lower connecting members. At the upper inside of each
outer mast frame an end roller is installed on the end roller shaft welded to the frame,
with a snap ring. In addition, the outer mast frames are fitted with side rollers to
sustain the inner mast frames. At the lower outside of each inner mast frame an end
roller is installed on the end roller shaft with snap ring, which is welded to the inner
mast. Under the end rollers other side rollers are located to sustain transverse load.
With the aid of these rollers, the inner mast can smoothly operate.
Notice: Please pay more regard to safety when maintaining the main rollers and
side rollers on the upper of outer mast.
8.3 Lift bracket
At the lift brackets, end rollers that roll along the inside of the inner mast frames
are installed on the end roller shafts with snap rings. The end roller shafts are welded
to the lift brackets. The side rollers that roll along on the inside of the inner mast
frames are bolt fitted, being shim adjusted. To prevent the rolling of the finger bar, two
retaining rollers are used, which roll along on the outside of inner mast frames. The
longitudinal load is sustained by the end rollers of which the upper ones emerge from
the top mast when the forks reach the maximum lift height. The transverse load is