Power Steering

Power Steering


Power Steering System

The power steering system consists of the following components:

- Power steering pump
- Power steering fluid reservoir
- Power steering pressure lines
- Power steering return lines
- Power steering fluid cooler
- Steering gear

The power steering system uses a vane-type pump to move the fluid from the reservoir to the steering gear and through the rest of the steering hydraulic system. The power steering pump is mounted to the engine and driven by the engine accessory drive belt. Power steering fluid flows into the pump from the reservoir. The power steering fluid is trapped between the pump vanes and moved to the high-pressure side of the pump creating a flow of fluid. The restriction of this flow by the steering gear creates the pressure that provides the steering assist. A combined pressure relief/flow valve is built into the pump to control the maximum pressure and flow provided to the steering system. This action prevents damage to the system and provides the correct level of assist during all engine speeds. While under pressure, the power steering fluid flows through the high-pressure power steering line to the steering gear. The fluid exits the gear and flows through the return line, the cooler and finally to the reservoir. The reservoir slows the fluid, allowing air to escape and filters the fluid before returning it to the pump.

Some vehicles are equipped with a Hydro-Boost(R) brake booster. The Hydro-Boost(R) brake booster is a hydraulically operated brake booster powered by the power steering pump. The power steering pump provides the fluid pressure to operate both the power brake booster and the power steering gear.

A Hydro-Boost(R) reserve system (accumulator) stores sufficient fluid under pressure to provide at least 2 power-assisted brake applications in the event the power steering pump fluid flow is interrupted. The brakes can also be applied manually if the reserve system is depleted.


Power Steering Pump

The power steering pump has the following features:

- A belt-driven, vane-type pump
- An identification tag indicating the model number and bar code
- Is replaced as an assembly


Steering Gear

The steering gear has the following features:

- A torsion bar-type, hydraulic-assisted system
- Reduces road shock and vibration
- Uses a rotary-style hydraulic valve


Steering Gear Identification

NOTE: Always use the identification code when ordering replacement parts.

An identification tag may be attached to the valve housing.

F-250/350 Steering Gear


















Power Steering Pump Identification

NOTE: Always use the identification code when ordering replacement parts.

The pump identification code is located on a tag attached to the power steering pump.