TM 9-4910-663-34
b.
Removal and Replacement of SPEED CONTROL Components.
(1)
Remove the panel retaining screws from the sides and front of the control panel of the test stand, raise the
control panel, and secure it in the up position with the slide bolt. Remove bottom rear panel.
(2)
Start the varidrive and rotate the SPEED CONTROL until the chain connecting link is at the top of the
sprocket.
(3)
Stop the varidrive. Disconnect main power from the test stand.
(4)
Remove the chain connecting link from the chain, and remove the chain.
(5)
Loosen the setscrew in the sprocket and remove the sprocket and key. Loosen the two setscrews in the
flanged bearing.
(6)
Remove the attaching screw from the handwheel, and remove the handwheel, felt washer, and pointer ring
gear.
(7)
Remove grease from the dial plate.
(8)
Remove the four attaching screws from the dial plate, and remove the dial plate.
(9)
Remove the lock ring from the control shaft.
(10)
Remove the cam housing, key, and associated parts as a unit from the control shaft.
(11)
Remove the locking pins, springs, and locking cam from the cam housing.
(12)
Remove the spacer from the control shaft.
(13)
Pull the control shaft out through the front of the test stand. It may be necessary to use a block of wood
and a crow bar between the varidrive frame and the inner end of the control shaft to force the adapter bracket bearing
from the adapter bracket.
(14)
Remove the control shaft from the bracket.
(15)
Remove the snap ring and bearing from the control shaft.
(16)
Remove the two bolts from the flanged bearing, and remove the flanged bearing from the bracket.
(17)
Remove the four bolts that attach the adapter bracket to the bracket, and remove the adapter bracket.
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