TM 9-2350-238-34-1
N O T E
T o i n c r e a s e b a c k l a s h , t r a n s f e r s h i m s
from shaft bearing housing to drive
g e a r b e a r i n g h o u s i n g . T o d e c r e a s e
b a c k l a s h , t r a n s f e r s h i m s f r o m d r i ve
g e a r b e a r i n g h o u s i n g t o s h a f t b e a r i ng
h o u s i n g . E a c h l a m i n a t i o n o f s h i m is
0 .0 0 2 i n . ( 0 . 0 0 5 c m ) t h i c k . A b o ut
0.001 in. (0.003 cm) change in
backlash requires transfer of two
s h i m l a m i n a t i o n s.
2 8 A p p l y w h i t e e n a m e l t o f o u r o r f i v e t e e t h of
bevel gear set spiral gear (12) and bevel
gear set spiral pinion gear (23). Rotate
g e a r s e t s h o u l d e r e d s h a f t ( 1 3 ) . E x a m i ne
w e a r p a t t e r n o n g e a r t e e t h . W e a r p a t t e rn
should be about one half length and depth
of tooth and centered on tooth face (p
2-97). Correct backlash (step 27) if wear
pattern is not correct.
2 9 R e m o v e t h r e e c a p s c r e w s ( 2 1 ) a n d d r i ve
g e a r b e a r i n g h o u s i n g ( 1 7 ) . U s i n g b e a r i ng
cup replacer (item 14, appx E), install new
plain encased seal (27) with open lip
facing into drive gear bearing housing.
2 - 1 29
