Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 2033

3B-22 STEERING

POWER STEERING UNIT

Power steering is designed to reduce the steering wheel turning effort by utilizing hydraulic pressure to bolster the
normal torque developed by the steering wheel box.
The power steering unit incorporates a power piston and sector shaft as an integral part of the steering gear. A
control valve is built into the steering housing.
Because the tire rolling resistance is constantly applied to the worm shaft, the torsion bar twists with the Steering
Wheel. As the torsion bar twists, the relative torque displacement between the worm shaft and the rotor changes.
An equivalent oil pressure is applied to the piston to bolster the normal torque.

STEERING 3B-23

POWER STEERING HYDRAULIC LINE

3B-24 STEERING

The function of each major component is described below:

Power Steering Unit
Refer to the previous page.

Oil Pump

The oil pump uses the power of the engine to send hydraulic fluid to the power steering unit.
An oil pressure relief valve and an oil flow relief valve are installed to the oil pump.
The oil pressure relief valve prevents any excessive oil pressure from reaching the hydraulic circuit.
The oil flow control valve controls the hydraulic fluid volume within the hydraulic system. It prevents too much fluid
from entering the system. This, in turn, prevents harmful heat build-up.

Oil Reservoir and Piping

The oil reservoir stores and filters the hydraulic fluid.

STEERING 3B-25

REMOVAL AND INSTALLATION

Removal Steps

1. Nut

V

2. Pitman arm
3. Bolt
4. Unit assembly

V

5. Coupling assembly

Installation Steps

V

5. Coupling assembly
4. Unit assembly

V

3. Bolt

V

2. Pitman arm

V

1. Nut

Important Operations - Removal

2. Pitman Arm
Pitman Arm Remover : 5-8840-2017-0