TM 55-4920-227-15
shaft (51) and secure with the retainer ring
assembled varidrive on the frame of the test
(48). Install the bearing collar (47) on the
stand. Secure the varidrive housing to the
ball bearing (49).
frame with four screws (24), flat washers
(8) Install the assembled varidisc (19) and
(25), lockwashers (26), and nuts (27).
control shaft (51) in the adapter bracket (56).
(6)
Install the stationary motor varidisc (para.
Aline the control nut (15) with the control
shaft (51), and thread the shaft into the
(7)
Connect the tagged varidrive motor
control nut, seating the end of the shaft in
electrical leads (para. 57).
the needle bearing (55).
Lubricate the
(8)
Connect the tagged tachometer generator
control shaft threads.
leads (para. 52).
(9) Aline the mounting holes in the bearing
(9)
Install tube assembly (para, 42).
collar (47) with the holes in the adapter
(10)
Start the test stand (para. 20). Rotate the
bracket (56) and secure with four screws
control shaft (51) clockwise, until the
(46).
tachometer indicates 11,000 rpm. Turn the
(10) Install the woodruff key (50) and gear (45)
stud (16) in the control nut (15) in a
on the control shaft (51) and secure with two
clockwise direction until the protruding end
washers (43 and 44) and screw (42).
of the stud contacts a boss in the adapter
e. Installation and Adjustment.
bracket which limits the travel of the control
(1) Pack the ball bearing (57) with grease and
nut and varidrive speed.
install the bearing cap (58), and ball bearing
(11)
Rotate the control shaft in a counter-
(57) on the shaft of the motor assembly (17).
clockwise direction until the tachometer
(2) Insert the shaft of the motor assembly (17)
indicates 2,000 rpm. Turn the adjusting stud
in the adapter bracket (56). Aline the ball
(52) in the adapter bracket (56) until the
bearing (57) on the motor shaft with the
protruding end of the stud contacts the
bearing bore in the adapter bracket (56) and
control nut which limits the control nut travel
seat
the
bearing
in
the
bore.
and decrease of varidrive speed.
Simultaneously, aline the splines in the
(12)
Secure the mechanical stops in position by
movable varidisc (19) with the motor shaft
applying a paste of litharge, Specification
splines and slide the varidisc onto the motor
MIL-L-1147,
and
glycerine,
Federal
shaft. Secure the motor assembly (17) to
Specification O-G-491, on the threads of the
the adapter bracket (56) with four screws
studs (16 and 52).
(53) and lockwashers (54).
(13)
Start the test stand (para. 20) and depress
(3) Aline the holes in the bearing cap (58) with
the lower button (4, fig. 9) making certain the
the holes in the adapter bracket (56) and
electric remote control assembly (37, fig. 18)
secure the bearing cap to the adapter
is in the 2,000 rpm position.
bracket with three screws (40) and
(14)
Position the electric remote control on the
lockwashers (41).
adapter bracket and secure with four screws
(4) Use a suitable lifting device and position the
(38) and lockwashers (39).
assembled adapter bracket (56) and motor
assembly (17), as a unit, on the case frame
57. Varidrive Motor
(20). Secure the adapter bracket to the
a. Removal.
case frame with four screws (10) and
(1) Remove four screws (6, fig. 19),
washers (9).
lockwashers (7), and flat washer (8) from the
(5) Attach a sling to the three eyebolts and use
cover (3) and remove the
a suitable lifting device to position the
AGO 6729A
36
