Jeep Cherokee 1999 Electronic Service Manual page 141

3 - 106 DIFFERENTIAL AND DRIVELINE
ADJ U ST M EN T S (Cont inue d)
Fig. 55 Crossbore Arbor
Fig. 56 Depth Shim(s) Selection
ple, if t h e dept h va r ia n ce is –2, a dd +0.002 in . t o t h e
dia l in dica t or r ea din g.
NOTE: Depth shims are available in 0.001-inch
increments from 0.020 inch to 0.038 inch.
(26) Rem ove t h e t ools fr om t h e differ en t ia l h ou s-
in g.
DIFFERENTIAL BEARING PRELOAD AND GEAR
BACKLASH
Th e followin g m u st be con sider ed wh en a dju st in g
bea r in g pr eloa d a n d gea r ba ckla sh :
• Th e m a xim u m r in g gea r ba ckla sh va r ia t ion is
0.003 in ch (0.076 m m ).
• Ma r k t h e gea r s so t h e sa m e t eet h a r e m esh ed
du r in g a ll ba ckla sh m ea su r em en t s.
• Ma in t a in t h e t or qu e wh ile a dju st in g t h e bea r in g
pr eloa d a n d r in g gea r ba ckla sh .
• E xcessive a dju st er t or qu e will in t r odu ce a h igh
bea r in g loa d a n d ca u se pr em a t u r e bea r in g fa ilu r e.
In su fficien t a dju st er t or qu e ca n r esu lt in excessive
differ en t ia l ca se fr ee-pla y a n d r in g gea r n oise.
• In su fficien t a dju st er t or qu e will n ot su ppor t t h e
r in g gea r cor r ect ly a n d ca n ca u se excessive differ en -
t ia l ca se fr ee-pla y a n d r in g gea r n oise.
NOTE: The differential bearing cups will not always
immediately follow the threaded adjusters as they
are moved during adjustment. To ensure accurate
bearing cup responses to the adjustments:
• Maintain the gear teeth engaged (meshed) as
marked.
• The bearings must be seated by rapidly rotat-
ing the pinion gear a half turn back and forth.
• Do this five to ten times each time the threaded
adjusters are adjusted.
(1) Use Wr en ch C-4164 t o a dju st ea ch t h r ea ded
a dju st er in wa r d u n t il t h e differ en t ia l bea r in g fr ee-
pla y is elim in a t ed (F ig. 57). Allow som e r in g gea r
ba ckla sh (a ppr oxim a t ely 0.01 in ch /0.25 m m ) bet ween
t h e r in g a n d pin ion gea r. Sea t t h e bea r in g cu ps wit h
t h e pr ocedu r e descr ibed a bove.
Fig. 57 Threaded Adjuster Tool
(2) In st a ll dia l in dica t or a n d posit ion t h e plu n ger
a ga in st t h e dr ive side of a r in g gea r t oot h (F ig. 58).
Mea su r e t h e ba ckla sh a t 4 posit ion s (90 degr ees
a pa r t ) a r ou n d t h e r in g gea r. Loca t e a n d m a r k t h e
a r ea of m in im u m ba ckla sh .
(3) Rot a t e t h e r in g gea r t o t h e posit ion of t h e lea st
ba ckla sh . Ma r k t h e gea r so t h a t a ll fu t u r e ba ckla sh
m ea su r em en t s will be t a ken wit h t h e sa m e gea r
t eet h m esh ed.
(4) Loosen t h e r igh t -side, t igh t en t h e left -side
t h r ea ded a dju st er. Obt a in ba ckla sh of 0.003 t o 0.004
in ch (0.076 t o 0.102 m m ) wit h ea ch a dju st er t igh t -
en ed t o 14 N·m (10 ft . lbs.). Sea t t h e bea r in g cu ps
wit h t h e pr ocedu r e descr ibed a bove.
(5) Tigh t en t h e differ en t ia l bea r in g ca p bolt s 95
N·m (70 ft . lbs.).
X J