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be adjusted by adjusting the cylinder caps.
(4) Make use of the spacer of the lift cylinder to adjust the error occurred between the
right and left cylinders in height.
9.54 Lift Cylinder Assembly
Lift Cylinder Assembly make up of lift cylinders, lift chain assembly, sheave
assembly etc.
Each lift cylinder is located behind each side of outer mast frame, cylinder
bottom fixed upon the cylinder bracket of outer mast, the upper end of the piston rod
is connected with beam set bolts. The travel distance of two lift cylinders should be
equal to in-phase, otherwise, adjust the set bolts of the top of cylinder.
The lift cylinder assembly consists primarily of a cylinder body, piston, piston
rod and cylinder cap. At the lower part of the cylinder body is arranged an inlet for
high-pressure oil，and at the upper part there is an outlet for low-pressure oil above the
piston packing, to which a return pipe is connected.
The piston is fastened to the piston rod with steel wire, snap ring, cotter pin,
together with an O-ring. An oil seal and bushing are installed on the cylinder cap
which is screwed into the cylinder body. The wearing supports the piston rod，and the
Dust seal prevents dust from entering the cylinder. The upper end of the piston rod is
locked with piston head set bolts on the crossbeam.
When the lift lever is pulled backward, high-pressure oil is sent into the lift
cylinders through their inlets to push up the piston rods, the piston head and beam,
rising the forks and side suspenders by chains. As the lift lever pushed forward, the
pistons of the lift cylinders descend by the weights of the piston rods, lift bracket and
forks, pushing oil under the piston to flow out of the cylinders. The oil discharged off
the cylinders is regulated by the flow regulator and returns through the control valve
to the oil tank.
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