TM 9-4910-663-34
(13)
Tighten clamping bolts (12) on the varidisc split hub securely.
(14)
Remove the block of wood from between variable discs (1 and 2).
(15)
Rotate the varidisc by hand and turn the speed control handwheel until all varibelt slack is taken up. Do
not force the speed control handwheel.
(16)
Install support bracket (5) and end cover (13) using screws (4 and 14) and lockwashers (4.1 and 14.1).
(17)
Install plug adapter (6) on support bracket (5) end of the variable shaft. Install bearing retaining hardware
in the support bracket.
(18)
Install coupling bushing (7), and install tachometer generator with bracket (9) using screws (8) and
lockwashers (8.1).
(19)
Install the right side cover of the varidrive.
(20)
Install the upper and lower rear panels of the test stand.
b.
Removal and Replacement of Gearcase Front Bearings (fig 3-5).
(1)
Remove the varidrive assembly from the test stand. Refer to paragraph 2-19.
(2)
Remove two 5/16-18 hex head screws (121) and lockwashers (122) from each of two bearing caps (123).
(3)
Remove 10 3/8-16 hex head screws (31) from gearcase and generator mounting bracket (75) and remove
the gearcase and generator mounting bracket.
(4)
Remove two bearing locknuts (73) and washers (74).
(5)
Remove bearings (77).
(6)
Reverse the procedures of steps (1) through (5) to install the replacement gearcase front bearings. Use
gasketing material to reseal gearcase and generator mounting bracket (75).
c.
Removal and Replacement of Gearcase Rear Bearings (fig 3-5).
(1)
Remove the varidrive assembly from the test stand, and remove the gearcase front bearings. (Refer to
paragraphs 2-19 and 3-19b.)
(2)
Remove two locknuts (94) from input shaft (98).
Change 1 3-35
