Zoomlion ZT20J, Service And Maintenance Manual

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5-17
Figure 5-18 Removal of the retracting boom wire rope
g. Remove the bolt 4, use a suitable tool to pull out the pin 3, and take out the retractable boom pulley
from the end of the base boom.
h. Pull the rope head of the retractable wire rope placed on the inner side of the three-joint boom to the
outside, pass through the fabrication hole 1, and pull out the retractable wire rope from the tail of the
base boom.
Note: retracted boom rope installed at the bottom (platform end) of the boom have been removed.
5.2.7.2 Inspection
a. Inspect the wire rope for damage, especially if the wire rope is broken at the valley and joints.
When the wire rope is in a tight state, the valley break may be exposed.
b. Check whether the wire rope is corroded.
c. Check whether the rope is tangled or misused.
Install or operate the wire rope not as required, and make the wire rope rotate around its
own axis, which may cause tangling when tensioning the wire rope.
d. Inspect the extended and retracted wire rope pulley bearings for wear, scratches, or other damage,
and for ovality. Replace bearings if necessary.
e. Inspect the extending wire rope and retracted wire rope pulley pin for scratches, tapers, and ovality.
Replace pin if necessary.
f. Inspect all pulleys for excessive wear, grooves, burrs, or other damage. Replace pulley if necessary.
Use a groove abrasion meter to check whether the pulley is excessively worn.
g. The inspected wire rope should be lubricated with wire rope lubricant before reinstallation.
Pin 3
Bolt 4
retracting
fabrication hole 1
boom retracting wire rope