© Feb. 2023 42 TB20J Plus Maintenance Manual
CHASSIS AND TURNTABLE ASSEMBLY
Fig 10 Instruction for inserting feeler gauge
Check the connecting bolt between the chassis
and the slewing bearing
1. Adjust the machine to the position as shown in the
Figure (b) below.
2. Locate the connecting bolt between the chassis and
the slewing bearing.
3. As indicated by Page 42, Instruction for inserting
feeler gauge, insert the 0.04mm (0.0016in) feeler
gauge between the bolt and washer in the quadrant
opposite to the turntable counterweight.
4. Make sure that the feeler gauge will not penetrate
under the bolt head to the bolt shank.
5. Rotate the turntable 90° to check the bolts in the
next quadrant.
6. Rotate the turntable 90° again until all bolts have
been inspected.
Check the connecting bolts between the turnta-
ble and the slewing bearing
1. Adjust the machine to the position as shown in the
Figure (b) below.
2. Locate the connecting bolt between the turntable
and the slewing bearing.
3. As indicated by Page 42, Instruction for inserting
feeler gauge, insert the 0.04mm (0.0016in) feeler
gauge between the bolt and washer in the semi-
circle opposite to the turntable counterweight.
4. Make sure that the feeler gauge will not penetrate
under the bolt head to the bolt shank.
5. Adjust the machine to the position as shown in the
Figure (a) below.
6. As indicated by Page 42, Instruction for inserting
feeler gauge, insert the 0.04mm (0.0016in) feeler
gauge between the bolt and washer in the other
semicircle (turntable counterweight).
7. Make sure that the feeler gauge will not penetrate
under the bolt head to the bolt shank.
Fig 11 Checking slewing bearing connecting bolts (a)
1. Main boom fully extended;
2. Main boom horizontal.
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