Zoomlion ZT20J, Service And Maintenance Manual

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5.2.7.3 Installation
a. Please follow the reverse steps of disassembly, the wire rope needs to be lubricated with wire rope
lubricant before installation.
b. Threaded fasteners should be tightened in place according to the torque values in Section 2
Specifications.
5.2.8 Wire rope and pulley check
5.2.8.1 Daily inspection
Before operation:
a. Fully retract the boom.
b. Extending and retracting the boom.
c. Check for delays and irregularities in the expansion and contraction of the three-section boom. If a
delay occurs, the wire rope is loose.
5.2.8.2 Three months check
a. Remove the tail cover of the base boom and the cover of the side fabrication hole, and use a flashlight
to visually inspect the wire rope for rust, damage, wear, misuse and other abnormal phenomena.
b. Pull the wire rope manually to check the tightness of the wire rope. The tensioned wire rope has
almost no lateral displacement.
5.2.8.3 12 years or 7000 hours replacement
a. After 12 years or 7000 hours of use, the wire rope and pulley must be replaced compulsorily.
b. The ropes and pulleys need to be inspected more often if:
1) The machine is exposed to harsh environments.
2) The boom operation is not smooth or there is abnormal noise.
3) The machine is idle for a long time.
4) The boom is overloaded or holds shock load.
5) The boom is exposed to an arc, and the inside of the wire rope may fuse together.
5.2.8.4 Additional replacement criteria
Pulleys and wire ropes must be replaced in sets.
a. Wire rope is rusted or corroded.
b. Wire rope tangled, "knotted" or wrinkled.