Clutch Components; Clutch Hydraulic Fluid; Clutch Lubrication; Safety Precautions - Jeep Cherokee 1999 Electronic Service Manual

6 - 2 CLUTCH
GEN ERAL I N FORM AT I ON (Cont inue d)

SAFETY PRECAUTIONS

WARNING: EXERCISE CARE WHEN SERVICING
CLUTCH COMPONENTS.
CLUTCH DISCS DO NOT CONTAIN ASBESTOS
FIBERS. DUST AND DIRT ON CLUTCH PARTS MAY
CONTAIN ASBESTOS FIBERS FROM AFTERMAR-
KET COMPONENTS. BREATHING EXCESSIVE CON-
CENTRATIONS OF THESE FIBERS CAN CAUSE
SERIOUS BODILY HARM. WEAR A RESPIRATOR
DURING SERVICE AND NEVER CLEAN CLUTCH
COMPONENTS WITH COMPRESSED AIR OR WITH
A DRY BRUSH. EITHER CLEAN THE COMPONENTS
WITH A WATER DAMPENED RAGS OR USE A VAC-
UUM CLEANER SPECIFICALLY DESIGNED FOR
REMOVING ASBESTOS FIBERS AND DUST. DO NOT
CREATE DUST BY SANDING A CLUTCH DISC.
REPLACE THE DISC IF THE FRICTION MATERIAL IS
DAMAGED OR CONTAMINATED. DISPOSE OF ALL
DUST AND DIRT CONTAINING ASBESTOS FIBERS
IN SEALED BAGS OR CONTAINERS. THIS WILL
HELP MINIMIZE EXPOSURE TO YOURSELF AND TO
OTHERS. FOLLOW ALL RECOMMENDED SAFETY
PRACTICES PRESCRIBED BY THE OCCUPATIONAL
SAFETY AND HEALTH ADMINISTRATION (OSHA)
AND THE ENVIRONMENTAL SAFETY AGENCY
(EPA), FOR THE HANDLING AND DISPOSAL OF
PRODUCTS CONTAINING ASBESTOS.

CLUTCH HYDRAULIC FLUID

If in spect ion or dia gn osis in dica t es a ddit ion a l flu id
m a y be n eeded, it will be n ecessa r y t o r epla ce t h e
com plet e h ydr a u lic lin ka ge a ssem bly.
CLUTCH LUBRICA TION
P r oper clu t ch com pon en t lu br ica t ion is im por t a n t
t o sa t isfa ct or y oper a t ion . Usin g t h e cor r ect lu br ica n t
a n d a voidin g over lu br ica t ion a r e a lso equ a lly im por-
t a n t .
Du r in g ser vice, a pply r ecom m en ded lu br ica n t spa r-
in gly. Do n ot over lu br ica t e a s t h is cou ld r esu lt in
clu t ch disc a n d pr essu r e pla t e con t a m in a t ion .
Clu t ch a n d t r a n sm ission com pon en t s r equ ir in g
lu br ica t ion a r e:
• pilot bea r in g.
• r elea se lever pivot ba ll st u d.
• r elea se lever pivot su r fa ces.
• r elea se bea r in g bor e.
• clu t ch peda l pivot bor e a n d bu sh in gs.
• t r a n sm ission in pu t sh a ft splin es a n d pilot h u b.
• r elea se bea r in g slide su r fa ce of fr on t bea r in g
r et a in er.
• m a st er cylin der bu sh in g a t t h e clu t ch peda l.
D o n o t a p p ly g re a s e to a n y p a rt o f th e c lu tc h
c o v e r o r d is c .
FACTORY INSTALLED
Use Mopa r m u lt i-m ilea ge gr ea se or a silicon e
gr ea se for t h e clu t ch peda l bu sh in gs a n d pivot sh a ft .
Use Mopa r h igh t em per a t u r e bea r in g gr ea se or
equ iva len t for t h e pilot bea r in g, r elea se bea r in g bor e,
t r a n sm ission in pu t sh a ft a n d r elea se for k com po-
n en t s. Apply r ecom m en ded a m ou n t s on ly a n d do n ot
over lu br ica t e.
INSTALLA TION METHODS AND PARTS USAGE
Dist or t ion of clu t ch com pon en t s du r in g in st a lla t ion
a n d t h e u se of n on -st a n da r d com pon en t s a r e com m on
ca u ses of clu t ch m a lfu n ct ion .
Im pr oper clu t ch cover bolt t igh t en in g ca n dist or t
t h e cover. Th e u su a l r esu lt is clu t ch gr a b, ch a t t er
a n d r a pid wea r.
An im pr oper ly sea t ed flywh eel a n d/or clu t ch h ou s-
in g a r e a ddit ion a l ca u ses of clu t ch fa ilu r e. Im pr oper
sea t in g will pr odu ce m isa lign m en t a n d a ddit ion a l
clu t ch pr oblem s.
Th e u se of n on -st a n da r d or low qu a lit y pa r t s will
a lso lea d t o pr oblem s a n d wea r. On ly u se r ecom -
m en ded fa ct or y pa r t s.
A cocked pilot bea r in g is a n ot h er ca u se of clu t ch
n oise, dr a g, h a r d sh ift in g, a n d r a pid bea r in g wea r.
Alwa ys u se a n a lign m en t t ool t o in st a ll a n ew bea r-
in g. Th is pr a ct ice h elps a void cockin g t h e bea r in g
du r in g in st a lla t ion .
DESCRI PT I ON AN D OPERAT I ON
CLUTCH OPERA TION
Lever a ge, cla m pin g for ce, a n d fr ict ion a r e wh a t
m a ke t h e clu t ch wor k. Th e disc ser ves a s t h e fr ict ion
elem en t a n d a dia ph r a gm spr in g a n d pr essu r e pla t e
pr ovide t h e cla m pin g for ce. Th e clu t ch peda l, h ydr a u -
lic lin ka ge, r elea se lever a n d bea r in g pr ovide t h e
lever a ge.
Th e clu t ch cover a ssem bly cla m ps t h e disc a ga in st
t h e flywh eel. Th e a ssem bly con sist s of t h e cover, dia -
ph r a gm spr in g, pr essu r e pla t e, a n d fu lcr u m com po-
n en t s. Th e pr essu r e pla t e cla m ps t h e clu t ch disc
a ga in st t h e flywh eel a n d t h e spr in g pr ovides t h e
cla m pin g for ce.
Th e clu t ch disc fr ict ion m a t er ia l is r ivet ed t o t h e
disc h u b. Th e h u b bor e is splin ed for in st a lla t ion on
t h e t r a n sm ission in pu t sh a ft . Th e h u b splin es con -
n ect t h e disc t o t h e t r a n sm ission .
Th e clu t ch lin ka ge u ses h ydr a u lic pr essu r e t o oper-
a t e t h e clu t ch . Th e clu t ch m a st er cylin der pu sh r od is
con n ect ed t o t h e clu t ch peda l a n d t h e sla ve cylin der
pu sh r od is con n ect ed t o t h e r elea se lever in t h e
clu t ch h ou sin g.
Depr essin g t h e clu t ch peda l develops flu id pr essu r e
in t h e clu t ch m a st er cylin der. Th is pr essu r e is t r a n s-
m it t ed t o t h e sla ve cylin der t h r ou gh a con n ect in g
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