Zoomlion ZT20J, Service And Maintenance Manual

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5- 20
c. Install adjusting nuts on the outrigger and retracting arm ropes (if readjusting, remove the nylon
sleeve lock nut).
d. At the same time, pre-tighten the nuts of the outrigger and retract arms, and the torque does not
exceed 20Nm/15ftlb.
e. Adjust the nut of the retractable wire rope so that the swing boom is parallel to the base boom vertical
plate (during use, if the swing arm is not parallel to the vertical plate, it can be determined that the
retractable wire rope is loose).
Figure 5-21 Swing boom parallel
f. Tighten the two nuts of the extending boom wire rope alternately, and use a torque wrench to tighten
the nuts of the extending boom wire rope to 25 ~ 30Nm/18~22ftlb (note that the roller of the travel
switch should be placed in the center of the groove of the support when tightening).
g. Tighten the nut 1 of the retractable boom rope M20, and use a torque wrench to tighten the nut of
the retractable boom rope to 55 ~ 60Nm/40~44ftlb.
h. Enable the boom telescopic function and extend the boom 1 ~ 1.5m/3.28~4.92ft.
i. Torque of shortened boom rope M20 nut 1 to 55 ~ 60Nm/40~44ftlb.
j. Enable the boom telescopic function, make the boom retract about 0.5 ~ 0.8m/1.64~2.62ft first (do
not retract the telescopic cylinder to the extreme position), and extend the boom again to the position
of 1 ~ 1.5m/3.28~4.92ft.
k. Check the torque of the retracted boom rope nut 1. If the torque is less than 55Nm, repeat steps i and
j, and check again until the torque reaches the standard.
To make the torque on all 4 ropes the same, steps i and j may need to be repeated.
l. After all wire ropes are properly tightened, install nylon sleeve lock nuts. Remove all clamping
devices and install all covers and guards. Check whether the boom function is normal.
5.3 Load Cell Check
Please follow the steps below to operate the device to adjust the load cell:
boom
Swing Vertical Nut 1