TM 9-2320-279-34-3
M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
17-7.1. SWING DRIVE MOTOR REMOVAL/REPAlR/INSTALLATION (M984E1) (CONT).
b. Disassembly
NOTE
There are two models of swing drive motors.
Model B has a back-up ring and no spacer
on gear shaft. Model B motor is equal in
size and functional performance and fully
interchangeable with Model A. Some
internal parts are also interchangeable.
refer to TM 9-2320-279-24P for proper
identification of parts.
(1)
(2)
(3)
(4)
(5)
(6)
Remove counterbalance valve
(para 17-6.1).
Remove tee fitting (1) from elbow (2).
Remove elbow (2) and preformed
packing (3) from end plate (4).
Remove seven screws (5), washers (6),
end plate (4), and preformed packing (7)
from gear assembly (8).
Remove gear assembly (8) and preformed
packing (9) from plate (10).
Remove star (11) from gear assembly (8).
NOTE
Model B motor has no spacer. Skip step (7) for
Model B.
(7)
Remove spacer (12) from gear shaft (14).
(8)
Remove plate (10), preformed
packing (13), and gear shaft (14) from
motor (15).
17-34.2
Change 3
