Zoomlion ZT20J, Service And Maintenance Manual

Page: 62 / 113

5-3
bearing if necessary.
c. Inspect all threaded parts for damage such as stretching, thread deformation or distortion and replace
if necessary.
5.1.2.3 Installation
a. Follow the reverse steps of disassembly. The interface of the hydraulic pipe joint and balance valve
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
.
5.1.3 Jib lifting cylinder
5.1.3.1 Disassembly
a) Mark and disconnect the hydraulic line connecting the jib lifting cylinder balancing valve, collect
the hydraulic oil in the pipeline with a suitable container, and seal the port of the pipeline after
collecting.
b) Disassemble the connecting bolt of the support and the lower link 1, the connecting bolt of the
support and the upper link 2, the stopper pin, and remove the pin to remove the jib lifting cylinder.
5.1.3.2 Inspection
a. Inspect the shaft pin for wear, scratches, taper, ovality or other damage and replace the pin if
necessary.
b. Inspect the inner ring of the bearing for scratches, distortion, wear or other damage and replace the
bearing if necessary.
c. Inspect all threaded parts for damage such as stretching, thread deformation or distortion and replace
if necessary.
5.1.3.3 Installation
a. Follow the reverse steps of disassembly. The interface of the hydraulic pipe joint and balance valve
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.