Zoomlion ZT20J, Руководство по обслуживанию и ремонту

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4-12
objects from approaching or entering the meshing area.
c) Check the integrity of the slewing bearing seal and repair or replace it in time if damaged.
d) Check the meshing operation of the slewing gear. In order to reduce the wear of the small gear and
the large gear, adjust the meshing gap between the small gear and the large gear within the range of
(0.15 to 0.25) mm/(0.00591-0.00984)in.
4.11.3 Disassembly
a) Install the appropriate spreader on the turntable and tension the spreader properly. Provide support
or obstructions to the boom if feasible.
b) Remove the hydraulic pipe of the rotary joint and properly fix the hydraulic pipe; remove the
rotary reducer and keep it properly.
c) Remove the connecting bolts between the slewing bearing and the turntable.
d) Lift off the car part, as shown in Figure 2. The weight of the car part is about 10T/22046lb. To
ensure safety, please use a crane of more than 15T/33069lb.
e) Remove the connecting bolts between the slewing bearing and the chassis.
f) Install 2 M16 eyebolts, lift off the slewing bearing and place it properly.
g) The slewing bearing installation process is the reverse of the above process. Bolt installation must
use thread locking glue, and the bolt tightening torque is not less than 520Nm/384ftlb.
The bolt of the slewing bearing is a very important connection piece of this equipment. Users
should not continue to use the removed bolt, but use a new bolt.
Figure 4-10 Upper Part Disassembly
4.12 Gear clearance adjustment of slewing mechanism
The gear gap of the slewing mechanism refers to the meshing clearance between the small gear on the
slewing reducer and the slewing bearing (large gear). If the clearance is too tight, it will cause unsmooth
rotation and even damage to components. If the clearance is too loose, it will cause the vehicle to shake