TOPIC 1. STEERING

TM 10-3930-644-14&P

POWER STEERING SYSTEM

TOPIC 1. STEERING

A. DESCRIPTION

to the right, fluid flows out of one port in the gear to the

forward power steer cylinder port. The fluid forces the

Vehicles with power steering have 3 steering wheel and

piston in the cylinder our, thereby pushing backward on

column. a hydraulically operated steer gear at the base

the drag link. The drag line pushes on the pivot arm.

of the column, a hydraulic pump, filter, reservoir, and a

The pivot arm turns, moving the tie rods with it. The

power steer cylinder that actuates the drag link. The

other ends of the tie rods connect to the spindles on

drag link moves the tie rods which, in turn, transfer

which the steer wheels are mounted. Therefore, the

movement to the steer wheels at the back of the truck.

wheels turn.

The steer wheels turn the truck in the same direction as

When the steering wheel Ls turned to the left, the

the steering wheel Ls turned, but they do this by

hydraulic fluid flows out of the other port in the steer

swinging the back of the truck away from the turn.

gear. This fluid is forced into the back of the power steer

cylinder. This forces the piston forward. the piston

The steering wheel and column are similar to standard

takes the drag link forward with it. The drag link pulls

steer systems, but the gear has ports for the movement

forward on the pivot arm, and the pivot arm pulls the tie

of hydraulic fluid. When the steering wheel is turned

rods and thus, steers the wheels into position for a left

turn.

Figure 1. Power Steering Components

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