© Apr 2022 5-26 TB18 Plus&20J Plus Maintenance Manual
MAINTENANCE PROCEDURES
5. Lower the main boom to horizontal position, and
fully extend the main boom.
6. As indicated by the arrow Fig 5-27 , page 5-24,
insert 0.04mm feeler gauge in between the bolt and
washer.
7. Ensure the feeler gauge won’t go through the
outside of bolt head to the bolt shank.
B-14 Lubricate Slewing Bearing
Regulary lubricating the slewing bearing from a long
distance is vital to proper machine operation. The
Lubricating frequency and the amount of lubricant used
should be increased if the machine is operated on
successive work shifts or in hostile environment.
• Lube point：1 grease nipple (see the following
figure)
Figure 5-31
• Amount：as needed
• Lubricant：ZL-3 lithium based grease
B-15 Inspect Platform Rotate Cylinder
Fasteners
Regularly inspecting the platform rotate cylinder
fasteners is vital to proper and safe machine operation.
Figure 5-32
1. Place the machine in stowed position.
2. Locate the platform rotate motor.
3. Inspect whether the bolt #1 as indicated in the
above figure is properly torqued to specification
（125Nm[92ft-lb]）.
4. If necessary, replace the bolt, torque to specified
value, and apply threadlocker Loctite 272.
5. Inspect whether the nut #2 as indicated in the
above figure is properly torqued to specification
（630Nm[465ft-lb]）.
6. If the bolt needs to be replaced, be sure to toruqe to
specification.
B-16 Test Cylinder Drift
Platform drift
Measuring the drift from platform to ground: with rated
load on platform and power off, fully extend the main
boom. The maximum allowable drift in 10 minutes is
50mm (1.97 in). If the test result exceeds this value,
please proceed as below.
Cylinder drift
Table 5-12
Cylinder Bore
Diameter
(mm/in)
Maximum Allowable Drift in
10 Minutes
(mm/in)
63/2.48 0.96/0.037
80/3.15 0.63/0.025
100/3.94 0.39/0.015
125/4.92 0.23/0.009
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