Jeep Cherokee 1999 Electronic Service Manual page 1326

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GEN ERAL I N FORM AT I ON (Cont inue d)
DI AGN OSI S AN D T EST I N G
LOW LUBRICANT LEVEL
A low t r a n sm ission lu br ica n t level is gen er a lly t h e
r esu lt of a lea k, in a dequ a t e lu br ica n t fill, or a n in cor-
r ect lu br ica n t level ch eck.
Lea ks ca n occu r a t t h e m a t in g su r fa ces of t h e gea r
ca se, in t er m edia t e pla t e a n d a da pt or or ext en sion
h ou sin g, or fr om t h e fr on t /r ea r sea ls. A su spect ed
lea k cou ld a lso be t h e r esu lt of a n over fill con dit ion .
Lea ks a t t h e r ea r of t h e ext en sion or a da pt er h ou s-
in g will be fr om t h e h ou sin g oil sea ls. Lea ks a t com -
pon en t m a t in g su r fa ces will pr oba bly be t h e r esu lt of
in a dequ a t e sea ler, ga ps in t h e sea ler, in cor r ect bolt
t igh t en in g, or u se of a n on –r ecom m en ded sea ler.
A lea k a t t h e fr on t of t h e t r a n sm ission will be fr om
eit h er t h e fr on t bea r in g r et a in er or r et a in er sea l.
Lu br ica n t m a y be seen dr ippin g fr om t h e clu t ch
h ou sin g a ft er ext en ded oper a t ion . If t h e lea k is
sever e, it m a y a lso con t a m in a t e t h e clu t ch disc ca u s-
in g t h e disc t o slip, gr a b, a n d/or ch a t t er.
A cor r ect lu br ica n t level ch eck ca n on ly be m a de
wh en t h e veh icle is level. Also a llow t h e lu br ica n t t o
set t le for a m in u t e or so befor e ch eckin g. Th ese r ec-
om m en da t ion s will en su r e a n a ccu r a t e ch eck a n d
a void a n u n der fill or over fill con dit ion . Alwa ys ch eck
TRANSMISSION AND TRANSFER CASE
Fig. 4 Geartrain Components
t h e lu br ica n t level a ft er a n y a ddit ion of flu id t o a void
a n in cor r ect lu br ica n t level con dit ion .
HARD SHIFTING
H a r d sh ift in g is u su a lly ca u sed by a low lu br ica n t
level, im pr oper, or con t a m in a t ed lu br ica n t s. Th e con -
sequ en ce of u sin g n on –r ecom m en ded lu br ica n t s is
n oise, excessive wea r, in t er n a l bin d, a n d h a r d sh ift -
in g. Su bst a n t ia l lu br ica n t lea ks ca n r esu lt in gea r,
sh ift r a il, syn ch r o, a n d bea r in g da m a ge. If a lea k
goes u n det ect ed for a n ext en ded per iod, t h e fir st in di-
ca t ion s of com pon en t da m a ge a r e u su a lly h a r d sh ift -
in g a n d n oise.
Com pon en t da m a ge, in cor r ect clu t ch a dju st m en t ,
or a da m a ged clu t ch pr essu r e pla t e or disc a r e a ddi-
t ion a l pr oba ble ca u ses of in cr ea sed sh ift effor t . In cor-
r ect a dju st m en t or a wor n /da m a ged pr essu r e pla t e or
disc ca n ca u se in cor r ect r elea se. If t h e clu t ch pr oblem
is a dva n ced, gea r cla sh du r in g sh ift s ca n r esu lt .
Wor n or da m a ged syn ch r o r in gs ca n ca u se gea r cla sh
wh en sh ift in g in t o a n y for wa r d gea r. In som e n ew or
r ebu ilt t r a n sm ission s, n ew syn ch r o r in gs m a y t en d t o
st ick sligh t ly ca u sin g h a r d or n oisy sh ift s. In m ost
ca ses, t h is con dit ion will declin e a s t h e r in gs wea r –
in .
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