TM 5-3805-281-24-2
Mechanical Drive Elements
17. Remove cap screws (B) from swing bearing (A).
18. Replace parts as necessary.
19. Slowly lower undercarriage onto track chain.
20. Lift sprocket end of undercarriage so sprocket clears
track chain.
43
4350
21. Pull undercarriage out from under upperstructure.
25
22. Remove swing bearing. (See procedure in this group.)
A--Swing Bearing
B--Cap Screw (36 used)
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1915MAY987/7
INSTALL UPPERSTRUCTURE
1. Push undercarriage under upperstructure.
2. Install guide pins to help align holes in swing bearing
(A) with holes in main frame. (See Section 99 for
instructions to make tool.)
3. Raise undercarriage into position using two 18-t
(20-ton) service jacks. It may be necessary to turn
swing bearing inner race to align teeth with teeth on
swing motor pinion shaft.
A--Swing Bearing
NOTE: If all cap screws are not accessible, tighten them
B--Cap Screw (36 used)
after the machine has been lowered and supports
have been removed.
4. Install cap screws (B) in swing bearing (A) and tighten
cap screws.
Swing Bearing-to-Upperstructure Cap Screw--Specification
Torque ....................................................................... 1230 Nm (900 lb-ft)
Continued on next page
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