Zoomlion ZT20J, Service And Maintenance Manual

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5-5
container, and seal the port of the pipeline after collecting.
d. Use suitable lifting equipment to hang the ends of the fixed pipe of the cable along the entire length.
e. Remove the bolts 1 fixing the moving pipe 1 on the three-section arm.
f. Remove the bolt 2 supporting the moving pipe 1 on the two-section arm.
g. Support the towline, take all feasible safety protection measures, remove the bolts 3 and 4 that fix
the fixed pipe on the base boom, and use the lifting equipment to lift the towline together with the
moving pipe and fixed pipe.
5.2.1.2 Inspection
a. Check the line for wear and replace the wiring harness if necessary.
b. Check hydraulic oil leaks and replace the line if necessary.
c. Inspect all threaded parts for damage such as stretching, thread deformation or distortion and replace
if necessary.
d. Check the cable structure for bending, cracking, weld separation or other damage and replace the
cable structure if necessary.
5.2.1.3 Installation
a. Follow the reverse steps of disassembly. The pipe joints of the hydraulic lines before installation
should be cleaned to prevent contaminants from entering the hydraulic system.
b. A hydraulic system pipe joint equipped with a sealing device needs to replace a sealing device before
the hydraulic line is connected.
c. Threaded fasteners should be tightened in place according to the torque values in Section 2
Specifications.
5.2.2 Leveling cylinder
5.2.2.1 Disassembly
Figure 5-4 Upper leveling cylinder disassembly diagram
jib Pin 2 telescopic Pin 3
Upper
leveling
Pin 1