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LUBRICATION AND MAINTENANCE
•
Fig. 4 Front Wheel and Spindle Bearings 4WD
Vehicles
INSPECTION
AND LUBRICATION
PROCEDURE
The condition of the grease i n the h u b and b e a r i n g
area on t r u c k s equipped w i t h either d r u m or disc
brakes should be inspected a t the i n t e r v a l s specified
above. The presence o f water, r u s t , or d i r t may i n d i -
cate the necessity of seal replacement. I f i t is found
t h a t the grease has become contaminated, is low or i f
the vehicle has been operated under severe or dusty
conditions, a l l of the l u b r i c a n t should be t h o r o u g h l y
cleaned f r o m the bearings, wheel hubs, dust cap, and/
or covers. A f t e r cleaning, carefully check for evidence
of spalling o f cups, rollers and i n n e r race of cone.
Bearings should be replaced i f any defects exist. A p -
ply grease to the h u b , a n n u l u s area, and dust cap us-
i n g H i g h Temperature M u l t i p u r p o s e Grease (E. P.
M O P A R F r o n t Wheel B e a r i n g Grease), or equivalent.
T o a v o i d m i x i n g d i f f e r e n t t y p e s o f g r e a s e w h i c h
m a y b e i n c o m p a t i b l e , n e v e r a d d g r e a s e , l u b r i -
cate c o m p l e t e l y .
UPPER AND LOWER CONTROL ARM BUSHINGS
A n off center condition of i n n e r m e t a l to outer
metal is a sign o f early f a i l u r e of upper and lower
control a r m bushings. T o t a l f a i l u r e is evident b y ex-
cessive movement w i t h i n b u s h i n g and a noise caused
by metal-to-metal contact. S m a l l cracks i n outer,
nonconfined rubber does not constitute f a i l u r e .
Lower control a r m bushings may be v i s u a l l y i n -
spected by l i f t i n g the vehicle on a hoist and inspect-
ing from underneath. Upper control a r m b u s h i n g
may be inspected b y r e m o v i n g the f r o n t wheels. I f
failure exists, replace b u s h i n g (see Group 2, F r o n t
Suspension for the proper procedure).
BRAKES
The vehicle is equipped w i t h disc brakes on t h e
front a n d d r u m brakes on the rear wheels. M a i n t e -
nance a n d service o n t h e brakes is covered under
Group 5, Brakes.
MASTER
CYLINDER
The f l u i d i n t h e master cylinders should be checked
w h e n p e r f o r m i n g other underhood services (Fig. 5). I f
necessary, add f l u i d t o b r i n g level t o t h e bottom o f
the s p l i t r i n g s . W i t h disc-brakes, f l u i d level can be
expected t o f a l l as the brake pads wear. However,
low f l u i d level m a y be caused b y a leak, and a
checkup m a y be needed. Only brake f l u i d conforming
to D O T 3 should be used (DOT 3 is Federal, Depart-
ment o f T r a n s p o r t a t i o n specification). M O P A R B r a k e
F l u i d i s a f l u i d of t h i s q u a l i t y and is recommended t o
provide best brake performance.
Fig. 5 Check Master Cylinder Fluid Level (Typical)
CAUTION: Use of a brake fluid that may have a
lower initial boiling point then speified by MVSS
116, DOT 3, may result in sudden brake failure dur-
ing hard, prolonged braking.
Use o n l y b r a k e
fluid
t h a t has been stored i n a
t i g h t l y closed container, to avoid contamination w i t h
foreign m a t t e r or moisture.
CAUTION: Do not allow petroleum base fluids to
contaminate the brake fluid. Seal damage will re-
sult!
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