Table of Contents
Advertisement
3 - 28
REAR AXLES
•
W h e n t h e t e e t h c o n t a c t p a t t e r n s a r e o b t a i n e d
b y t h e m e t h o d d e s c r i b e d a b o v e , t h e y a r e l i k e l y
t o b e r a t h e r s m a l l . W i t h a n a c t u a l o p e r a t i n g
l o a d , h o w e v e r , t h e c o n t a c t a r e a i n c r e a s e s .
PATTERNS CLOSE TO CENTER
HEEL END-DRIVE
HEEL END-COAST
SIDE (CONVEX)
SIDE (CONCAVE)
J9003-74
Fig. 39 Desired
Teeth Contact
Patterns
(With
Light
Load)
(4) I f , after e x a m i n i n g t h e r i n g gear contact pat-
terns, i t is determined t h a t t h e patterns resemble
those i l l u s t r a t e d i n F i g . 40, t h e drive p i n i o n gear is
separated too much f r o m t h e centerline o f t h e r i n g
gear. This condition w i l l cause t h e contact patterns
to be " h i g h " on the " d r i v e " side a n d near t h e " h e e l "
of the tooth, and " h i g h " on t h e "coast" side and near
the " t o e " o f t h e tooth. To correct for this type t e e t h
contact patterns, increase t h e thickness o f the depth
shim (located between t h e drive p i n i o n gear a n d t h e
drive p i n i o n gear shaft rear bearing). This w i l l cause
the " h i g h " contact p a t t e r n on the " d r i v e " side t o be
lowered a n d t o move t o w a r d t h e " t o e " of t h e t o o t h ,
and t h e " h i g h " contact p a t t e r n on t h e "coast" side t o
be lowered a n d to move t o w a r d t h e "heel" o f t h e
tooth (Fig. 41).
THICKER SHIM REQUIRED
HEEL END-DRIVE
HEEL END-COAST
SIDE (CONVEX)
SIDE (CONCAVE)
J9003-75
Fig. 40 incorrect
Teeth
Contact
Patterns—Increase
Depth Shim
Thickness
PATTERNS MOVE TOWARD CENTER
AND DOWN
HEEL END-DRIVE
HEEL END-COAST
SIDE (CONVEX)
SIDE (CONCAVE)
J9003-76
Fig. 41 Teeth Contact
Patterns
After Depth
Shim
Thickness
Is
Increased
(5) I f , after e x a m i n i n g the contact patterns, i t is de-
t e r m i n e d t h a t t h e patterns resemble those i l l u s t r a t e d
i n F i g . 42, t h e drive p i n i o n gear is too close t o t h e
centerline of the r i n g gear. This condition w i l l cause
the contact patterns to be " l o w " on t h e " d r i v e " side
and near t h e " t o e " of the tooth, and " l o w " on "coast"
side a n d near t h e "heel" o f the tooth. To correct for
t h i s type o f teeth contact patterns, decrease t h e
thickness o f t h e depth s h i m (located between t h e
drive p i n i o n gear and t h e drive p i n i o n gear shaft
rear bearing). T h i s w i l l cause the " l o w " contact pat-
t e r n on t h e " d r i v e " side to be raised and t o move t o -
w a r d t h e " h e e l " o f t h e tooth, and t h e " l o w " contact
p a t t e r n on t h e "coast" side to be raised and to move
t o w a r d t h e " t o e " o f the tooth (Fig. 43).
THINNER SHIM REQUIRED
HEEL END-DRIVE
HEEL END-COAST
SIDE (CONVEX)
SIDE (CONCAVE)
J9003-77
Fig. 42 Incorrect
Teeth Contact
Patterns—Decrease
Depth Shim
Thickness
(6) W h e n t h e correct teeth contact patterns are ob-
tained, i n s t a l l t h e drive shaft w i t h t h e i n s t a l l a t i o n
reference m a r k s aligned. T i g h t e n the clamp screws
w i t h 19 N-m (170 in-lbs) torque.
(7) For 8 3/8-inch diameter r i n g gear axles, i n s t a l l
the replacement axle shaft seals w i t h Seal I n s t a l l a -
Advertisement
Table of Contents
