TM 11-5826-225-35
(12) With the shaft of helical gear assem-
placed, perform alignment procedures
bly (52) flush with bottom of recess in
spur gear (120), slide collar (54) over
c. Replacement of Gear Train.
the end of the shank of spur gear
( l ) If the range switch has been removed,
(120) and tighten two setscrews (53).
replaced it (b above).
(13) Push helical gear assembly (52) down-
(2) Apply a small quantity of MIL-L-
ward until helical gear (49) is the only
7870 oil to the inner surface of the
gear engaged with worm gear (73).
bearings located at the top and bottom
(14) Rotate spur gear (120) eight teeth
of frame (136), and to the right as
clockwise as viewed from the bottom
viewed from the front.
of frame (136).
(3) P l a c e thrust washer (51), torsion
spring (50), helical gear (49), helical
(15) Push helical gear assembly (52) up-
s p r i n g (48), and flat washer (47)
ward until helical gear (49) and the
around gear shank of helical gear as-
gear on helical gear assembly (52)
sembly (52).
a r e both engaged with worm gear
(4) Place the ends of torsion spring (50)
(73).
into the retaining holes in helical gear
Note. In the following procedures, do not
(49) and helical gear assembly (52).
allow helical gear (49) or the gear on helical
gear assembly (52) to become disengaged
(5) S q u e e z e flat washer (47) together
with worm gear (73). Disengagement will
with helical gear assembly (52 ), and
cause loss of spring loading between helical
p u s h retaining ring (46) into the
gear (49) and helical gear assembly (52 ).
groove around gear shank of helical
If disengagement occurs, repeat (13), (14)
gear assembly (52).
and (16) above to restore spring loading.
(6) Slide collar (44) onto the longer sec-
(16) I n s e r t s h a n k o f s p u r g e a r ( 4 3 )
tion of shaft on helical gear assembly
t h r o u g h the top bearing on frame
(52).
(136), and slide the shank of spur
gear (43) over the longer shaft of
(7) Slide collar (54) on the shorter sec-
helical gear assembly (52).
tion of shaft on helical gear assembly
(52).
(17) With the shaft of helical gear assem-
(8) Orient helical gear assembly (52) so
bly (52) flush with the bottom of the
the shorter section of shaft is pointed
recess in spur gear (43), slide collar
down.
(45) over the shank of spur gear (43)
and tighten two setscrews (44).
(9) P l a c e helical gear assembly (52),
along with collars (44 and 45), be-
(18) Loosen two setscrews (53) and slide
tween the two bearings located at the
collar (54) down until it is against
top and bottom of frame (136), and
the bearing in the bottom of frame
to the right as viewed from the front.
(136).
(10) Place flat washers (117), spring ten-
(19) Apply blue varnish to the threads of
sion washer (118) and another flat
two setscrews (53), and tighten two
washer (119) around the shank of
setscrews (53).
spur gear (120).
(20) Loosen two setscrews (44) and slide
Note. The number of flat washers ( 117)
collar (45) up until it is against the
was recorded in the disasembly procedure
bearing at the top of frame (136).
of the gear train in paragraph 35e.
(21) Apply blue varnish to the threads of
(11) Insert the shank of spur gear (120)
two setscrews (44), and tighten.
through the bottom bearing on frame
(136), and slide the shank
(22) If there are no other parts to be re-
gear, 120) over the shorter
placed, perform alignment procedures
helical gear assembly (52).
3-15
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