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2 - 48
FRONT SUSPENSION
•
Fig. 66 Ring Gear "Backlash" Measurement
cording t o t h e instructions and i n f o r m a t i o n provided
i n t h e procedures above, good gear teeth contact pat-
terns should exist.
(1) A p p l y a t h i n coat of H y d r a t e d Ferric
Oxide
(commonly referred to as Yellow Oxide of Iron), or a n
equivalent product, t o b o t h t h e " d r i v e " side a n d t h e
"coast" side o f the r i n g gear teeth.
(2) Rotate t h e r i n g gear one complete revolution i n
both directions w h i l e a load is b e i n g applied w i t h a
round b a r or screwdriver inserted between t h e differ-
ential housing and t h e differential case flange. This
action w i l l produce a d i s t i n c t contact p a t t e r n o n both
the " d r i v e " side and t h e "coast" side o f the r i n g gear
teeth.
T h e g e a r teeth c o n t a c t p a t t e r n w i l l disclose
w h e t h e r o r not the d r i v e p i n i o n g e a r shaft r e a r
b e a r i n g
depth s h i m h a s t h e c o r r e c t t h i c k n e s s
a n d w h e t h e r o r not the r i n g g e a r " b a c k l a s h " h a s
been
adjusted
correctly. T h e " b a c k l a s h " be-
tween t h e r i n g g e a r a n d the d r i v e p i n i o n gear
must b e m a i n t a i n e d w i t h i n t h e specified limits
until t h e c o r r e c t teeth c o n t a c t p a t t e r n i s ob-
tained.
(3) E x a m i n e t h e contact patterns on t h e r i n g gear
teeth a n d compare t h e m w i t h those i n Figures 67
t h r o u g h 7 1 to determine i f the patterns are correct.
W i t h t h e drive p i n i o n gear depth o f mesh correct and
the r i n g gear "backlash" adjusted correctly, t h e teeth
contact patterns should closely resemble the patterns
i l l u s t r a t e d i n F i g . 67. Notice t h a t t h e i l l u s t r a t e d
teeth contact patterns are w e l l centered on both the
" d r i v e " side and t h e "coast" side o f the teeth.
W h e n t h e teeth c o n t a c t p a t t e r n s a r e obtained
by the method d e s c r i b e d above, they a r e likely
to be r a t h e r small. With a n a c t u a l
operating
load, h o w e v e r , the c o n t a c t a r e a i n c r e a s e s .
(4) If, 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 . 68, the d r i v e p i n i o n gear is
separated too much f r o m t h e centerline of t h e r i n g
PATTERNS CLOSE TO CENTER
HEEL END-DRIVE
HEEL END-COAST
SIDE (CONVEX)
SIDE (CONCAVE)
J9003-74
Fig. 67 Desired Teeth Contact Patterns (With Light
Load)
gear. This condition w i l l cause t h e contact patterns
to be " h i g h " o n t h e " 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 " o n t h e "coast" side and near
the " t o e " o f t h e tooth. To correct for t h i s type teeth
contact patterns, increase t h e thickness of the 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 inner/rear bearing). This w i l l
cause t h e " h i g h " contact p a t t e r n o n t h e " d r i v e " side
to be lowered a n d t o move t o w a r d t h e "toe" o f t h e
tooth, a n d t h e " h i g h " contact p a t t e r n on t h e "coast"
side to be lowered and t o move t o w a r d the " h e e l " of
the tooth ( F i g . 69).
THICKER SHIM REQUIRED
HEEL END-DRIVE
HEEL END-COAST
SIDE (CONVEX)
SIDE (CONCAVE)
J9003-75
Fig. 68 Incorrect Teeth Contact Patterns—Increase
Depth Shim
Thickness
(5) If, after e x a m i n i n g t h e 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 . 70, t h e drive p i n i o n gear is too close to t h e
centerline o f the r i n g gear. T h i s condition w i l l cause
the contact patterns to be " l o w " o n t h e " d r i v e " side
and near t h e "toe" of the tooth, a n d " l o w " on "coast"
side a n d near t h e " h e e l " o f t h e tooth. To correct for
t h i s type o f teeth contact patterns, decrease the
thickness o f t h e depth s h i m (located between t h e
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