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Crusader
MC-8
[ "°'
11-2
Stop at the instant the road wheels starf to move.
6. Mark the steering wheel again in line with a poin-
ter. Measure the distance between the two marks,
either in inches (millimeters) at the rim or as an
angle with its apex at the steering wheel center.
This measurement must not be over
2" (50.8
mm)
or 10°
0
2" (50 .8
mm) or 10
with no movement
at Front Road Wheels
NOTE: THE ABOVE READING MUST BE TAKEN
WITH ENGINE RUNNING.
FILLING POWER STEERING SYSTEM: When
the power steering hydraulic fluid system is drained,
or if any lines or connections are removed, it is
necessary to bleed air completely from the system to
ensure satisfactory operation.
HYDRAULIC SYSTEM: Use SAE No. I OW motor
(Service
MS).
Fill the reservoir to the recommended level as in-
dicated on the reservoir. If the level is higher, over-
flow will occur during operation. If the level gets too
low, air will be drawn into the system.
The proper refilling and bleeding procedure is as
follows:
Raise front end of vehicle until wheels clear the
floor. Fill the power steering fluid reservoir, located
in the engine compartment, to the FULL mark. Allow
the fluid to remain undisturbed for about two
minutes. Turn wheels to left and right in order to
remove air from the power steering cylinder, adding
fluid to the reservoir as needed to maintain level to
the FULL mark. Continue until air bubbles no longer
show in the reservoir.
Start engine and operate on idle speed. Turn
wheels to right and left, but do not hit wheel stops.
Add fluid as needed at the reversor until half way in
MAINTENANCE
DATE-
_ _ ]
MANUAL
June 15, 1974
.
the sight gauge. Continue until all air bubbles disap-
pear at the reservoir. Increase engine speed to 2/3 of
full
throttle,
continuing
the
procedure outlined
above. Lower the vehicle front end and turn wheels
to right and left a few more times. Check for fluid
leaks. Add fluid to reservoir until half way in the
sight gauge.
LUBRICATION: Use SAE
90
gear lubricant. Fill
the steering gear housing with lubricant. Fill the
housing from the uppermost filler plug. The housing
should be full to ensure adequate lubrication of all
internal parts. Capacity of the gear housing is
7
pints
(3.30 dm
3
).
STEERING GEAR
DESCRIPTION AND OPERATION
The
power
steering
gear
is
a
semi-integral
hydraulic unit which incorporates a hydraulic con~rol
, valve on a twin stud cam and lever mechanical
steering gear. Steering effort applied to the steering
wheel actuates the valve which, in turn, directs
hydraulic fluid from the pump to the power cylinder
located in the linkage.
The action of the steering gear is both manual and
hydraulic in effect. When the cam is turned to the left
or right by the driver's effort on the steering wheel,
the studs of the inner lever are moved through the
groove of the cam (worm), thus rotating the lever
shaft and providing angular movement of the steering
gear pitman arm. Whenever the driver's effort at !he
steering wheel exceeds the preload of the centering
springs,
the
control
valve
is
actuated
and
t_he
hydraulic power is applied to provide the driver with
power assistance.
The valve spool is moved axially as the cam is
moved axially although these parts are restrained
from axial movement by the centering springs in the
actuator. The effect of the springs is to center the ac-
tuator and valve spool (unless the steering force is
great enough to overcome the spring load in which
case the actuator and spool are moved axially.)
When the valve is in the center position, the oil
pressure at the two cylinder ports is low and equal
and produces ineffective forces in the cylinder. This
results in no movement of the piston and no cir-
culation of oil in the lines to the cylinder, however,
oil is circulating from the pump through the control
valve to the reservoir with sufficient pressure only to
overcome friction of lines and fittings.
When the driver's effort at the steering wheel over-
comes the centering effect of the springs, the valve
spool is moved axially restricting one of the return
passages to the outlet port thus causing an immediate
increase in pressure at one of the ports and in one end
of the cylinder. At the same time, the other return
passage is enlarged, allowing the oil from
the
discharging end of the cylinder free passage to the
outlet port and return to the reservoir. The im-
mediate effect is increased pressure in one end of the
cylinder to actuate the piston which applies hydraulic
power directly to the steering gear pitman arm. Full
pressure is obtained with a valve spool travel in one
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