Power Steering - Power-Assisted Recirculating Ball: Description

Power steering is composed of power steering pump and steering gear. Some models use a VT27 pump which has a separate oil reservoir, and some models use a ZF and VT49 pump, which has an integral oil reservoir.

All power steering pumps are engine driven vane type with a control valve. The purpose of the power steering gear pump is to supply fluid (under pressure) to the steering gear.

Steering gear has integral piston/steering nut. Fluid pressure to each side of piston/steering nut is controlled by a control valve which is moved by a lever from steering column shaft.