DNR Components

Power Steering Box Reconditioning

All Power Steering Boxes are fully stripped and inspected prior to repairs & reconditioning. Power Steering Box Reconditioning includes all boxes being chemically cleaned and rebuilt with Genuine seal Kits where available, Power Steering Boxes are then tested to ensure Fault free operation.

All Power Steering Boxes reconditioning works occurs in our own workshops within a 24hr period where possible. All reconditioned units carry a 12 months guarantee.

New and Reconditioned units are available from stock. In the event that your unit is not available DNR can offer a same day Power Steering Box Reconditioning service (subject to availability)

General Power Steering Box Diagram

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2
3
4
5
6
7
8
9
10
Power Steering Box
1

1. Adjusting Screw

2

2. Torsion Bar Valve

3

3. Steering Shaft

4

4. Oil Inlet

5

5. Oil Outlet

6

6. Power Chamber

7

7. Bearings

8

8. Power Chamber

9

9. Power piston, recirculating ball worm shaft

10

10. Cross Shaft

Nationwide Courier Deliveries – Free Collection & Delivery Within 10 Miles Of Our Workshop With Our Own Transport

The Hydraulics & Power Steering Specialists

Specialist Power Steering Box Reconditioning Services – 01706 354666

Power Steering Hydraulic Systems Explaines

Most power steering systems work by using a hydraulic system to multiply force applied to the steering wheel inputs to the vehicle’s steered (usually front) road wheels. The hydraulic pressure typically comes from a gerotor or rotary vane pump driven by the vehicle’s engine. A double-acting hydraulic cylinder applies a force to the steering gear, which in turn steers the roadwheels. The steering wheel operates valves to control flow to the cylinder. The more torque the driver applies to the steering wheel and column, the more fluid the valves allow through to the cylinder, and so the more force is applied to steer the wheels.

One design for measuring the torque applied to the steering wheel has a torque sensor – a torsion bar at the lower end of the steering column. As the steering wheel rotates, so does the steering column, as well as the upper end of the torsion bar. Since the torsion bar is relatively thin and flexible, and the bottom end usually resists being rotated, the bar will twist by an amount proportional to the applied torque. The difference in position between the opposite ends of the torsion bar controls a valve. The valve allows fluid to flow to the cylinder which provides steering assistance; the greater the “twist” of the torsion bar, the greater the force.

Since the hydraulic pumps are positive-displacement type, the flow rate they deliver is directly proportional to the speed of the engine. This means that at high engine speeds the steering would naturally operate faster than at low engine speeds. Because this would be undesirable, a restricting orifice and flow-control valve direct some of the pump’s output back to the hydraulic reservoir at high engine speeds. A pressure relief valve prevents a dangerous build-up of pressure when the hydraulic cylinder’s piston reaches the end of its stroke.

The steering booster is arranged so that should the booster fail, the steering will continue to work (although the wheel will feel heavier). Loss of power steering can significantly affect the handling of a vehicle. Each vehicle owner’s manual gives instructions for inspection of fluid levels and regular maintenance of the power steering system.

The working liquid, also called “hydraulic fluid” or “oil”, is the medium by which pressure is transmitted. Common working liquids are based on mineral oil. (Source)

DNR Components – Rochdale, Greater Manchester – Specialist Power Steering Box Reconditioning Services – 01706 354666

Power Steering Pump Reconditioning