TM 5-3810-300-24 & P2
for specific applications). These assemblies will include larger steering knuckles with stronger knuckle yokes, longer
knuckle pins and longer knuckle pin bushings. This will slightly increase the over-all track of the front axle assembly, but
more significantly, it will reduce bushing stress.
Steering knuckle caps for front axles employing sealed knuckle pins are equipped with top and bottom mounted grease
fittings. This allows lubricants to be forced into the bushing area through the top and bottom ends of the steering knuckle
and, therefore, provide a more even distribution of lubricants for easier steering.
Permanently lubricated tie rod end assemblies also employ lube seals that are designed to keep road contaminates from
the tie-rod cavity. This will prevent lubrication contamination due to the accumulation of corrosion and dirt around the tie
rod ball, and thus give longer service life. Since these tie rod end assemblies are permanently lubricated and sealed,
periodic lube intervals are not necessary.
Steering Gear.
The Steering Gear used is a Ross TR70. The steering gear is a semi-reversible cam and twin lever type. Both studs of
the twin lever engage the cam for normal straight ahead driving. As the steering action moves away from the normal
driving position into the parking range, one of the studs disengages the cam. The effective leverage of this single stud
increases so rapidly, however, that in full parking the leverage is 45 percent greater than with a single lever type of
steering gear. This is due largely to the fact that because of the twin levers the steering arm is shorter and therefore has
a full 100 degrees of travel com-pared to 76 degrees in a single lever unit. Actually the driver has at his disposal a dual
ratio which automatically changes from one ratio to suit the requirements of steering stability at high speeds and easy
wheel turn for sharp turns in parking. A valuable safety factor is a lessening of the tendency to over-steer on curves and
when passing other vehicles at high speeds.
Power Steering System. (Illus. 4-13).
Steering of the Carrier is accomplished through the Power Steering System. The System consists of a reservoir, pump,
flow control and relief valve, control valve and drag linkage and two 2 " diameter steering cylinders.
Fluid for power steering is pumped by a 8 GPM pump that is engine driven. The fluid is pumped from the power steering
reservoir. The fluid flows from the pump to the flow control and relief valve. The flow control and relief valve controls the
fluid flow to 7 GPM. The fluid is routed from the flow control and relief valve to the steering control valve. The steering
control valve directs the fluid to the cylinders. When the steering wheel is turned in either direction, the action is
transferred to the steering gear. The steering gear contains a cam that is connected to a lever shaft. As the cam turns the
lever shaft transfers the action to the steering arm. The steering arm actuates the control valve of the Power Steering
System.
If power steering is lost for any reason, the operator is capable of steering the Carrier manually. For detailed description
of the steering gear, refer to Steering Gear Description.
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