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20 08 CONTESSA
CHASSIS INFORMATION — 10
Steering Spindles
The steering spindles attach to the front
axle and pivot on the kingpin. The wheel end
assembly and brake system attach to the spindle.
There are upper and lower lubrication points
for the kingpin. The drag link attaches to the
roadside spindle. After initially lubricating
the roadside and curbside kingpins, rotate the
steering assembly lock to lock (full left to right)
then move assembly back to center. This purges
any remaining air pockets. Continue lubricating
the kingpins until new grease purges with no air
pockets. Greasing interval is every six months
or 5,000 miles.
Control Arm Bushings
Control arms align the axles perpendicular
with the frame. The panhard bar controls side
to side motion of the axles in the frame. Control
arm bushings and panhard bar bushings do not
require lubrication.
STEERING GEAR
Maintain the grease pack behind the output
shaft’s dirt and water seal as a general
maintenance procedure at least twice a year.
The grease tting is provided in the housing
trunnion. Use NLGI grade 2 multipurpose
chassis lube and use only a hand operated grease
gun on the tting. Add grease until it begins to
extrude past the sector shaft dirt and water seal.
Power steering is provided by using hydraulic
pressure to assist rotating the output shaft of
the steering gear. Located at the end of the
input shaft of the steering gear is poppet valve
and worm drive. The poppet valve directs the
hydraulic uid pressure to a type of spool.
The worm drive threads in the center of the
spool. When in the center position, pressurized
hydraulic uid bypasses the spool. When a turn
is made, the poppet valve shifts to one direction
or the other, directing the hydraulic pressure
to one side of the spool depending on turning
direction. The hydraulic uid is then cooled
before returning to the reservoir.
NOTE:
Inspect for signs of leakage when
performing fluid level checks.
Changing the hydraulic lters in the engine
compartment at regular intervals will help
ensure trouble-free operation.
DRIVE AXLE & DRIVE SHAFT
Drive Axle:
The chassis drive axle
is a single reduction
axle. The differential
gears consist of a hypoid
pinion and ring gear set
and bevel differential
gears. The differential
carrier can be removed
from the axle housing
as a unit in order to
perform repairs.
All power from the engine to the rear tires is
transferred through the rear axle. For this reason,
it is important that maintenance be performed on
the axle as required to avoid premature wear of
the gears and bearings in the axle.
Drive Axle Lubricant:
The rear axle is lled with 80w-90 gear oil
meeting SAE J 2360 specications. Change
interval is every 250,000 miles or 36 months,
whichever occurs rst.
Upper
Lubrication
Points
Lower
Lubrication
Points
090414
Zerk Fitting:
Located under
dust cap.
Steering Box - Rear View
090403b
090416
Ring and Pinion Gears
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