Zoomlion ZT20J, Руководство по обслуживанию и ремонту

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5-7
Figure 5-5 Lower leveling cylinder disassembly diagram
a. Follow the removal steps to disassemble the working platform, the jib and the upper leveling cylinder.
b. Adjusting the attitude of the boom to a position where the pin 1 and the pin 2 are completely exposed
and easy to disassemble.
c. Mark and disconnect the hydraulic line connecting the two cylinders balancing valve, collect the
hydraulic oil in the pipeline with a suitable container, and seal the port of the pipeline after collecting.
d. Use appropriate lifting equipment to support leveling both ends of the cylinder, and remove pin 2
and pin 1.
e. With the assistance of lifting equipment, slowly and carefully remove the leveling cylinder to avoid
damage caused by the collision between the leveling cylinder and the connecting rod.
f. Use a suitable plug to block the connector of the lower leveling cylinder balancing valve to prevent
dust and other pollutants from entering the oil line.
5.2.3.2 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.
Refer to the Pin and Bearing Inspection Instructions in the Section 3 for pin and bearing inspection.
5.2.3.3 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.
Pin 2
Pin 1
Leveling rod
Lower leveling cylinder
Rear linkage
Front linkage
Base boom