6B.1.3 ACTUATOR
The actuator is a ball and nut screw type. The screw lengthens and shortens according to motor
operation.
Motor operation is transmitted to the ball and nut unit after its speed is reduced by two gears.
The ball and nut unit are supported by two tapered roller bearings on the gearbox.
The actuator is installed with its tube side tted to the frame of the truck by a universal joint and
with its screw side tted to the center arm of the axle by a ball joint.
6B.1.4 REAR AXLE
The rear axle unit is of welded construction with a box-shaped cross section, consisting of an
axle, center arm, tie rods, and knuckles.
The rear axle support with a bushing press-tted is attached to the support pins located at the
front and rear of the axle. The support is bolted to the rear frame. The axle is so mounted as to be
cradled with the front and rear support pins as an axis.
The knuckle attached to each end of the axle is so structured as can turn clockwise and
counterclockwise around the king pin. The rear wheel hub is mounted on the spindle of the
knuckle through two tapered roller bearings. On the hub installed is the wheel with hub bolts and
nuts. The tapered roller bearing at the king pin side has a single-side seal to keep tight the grease
lled between the hub and the knuckle.
Fig. 6B.5 Actuator
EPS MOTOR
PINION GEAR
IDLE GEAR
BALL NUT
BREATHER
UNIVERSAL JOINT
BALL SCREW
6B. STEERING SYSTEM (EPS type)
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