Specifications
| Description | Nm |
|---|---|
| Lower steering column slider pinch bolt | 35 |
| Lower steering column to steering gear pinch bolt | 35 |
| Power steering control valve actuator | 2 |
| Power steering fluid cooler retaining bolts | 7 |
| Power steering pump pulley retaining bolts | 20 |
| Power steering pump retaining bolts - All except vehicles with diesel engine | 25 |
| Power steering pump retaining bolts - Vehicles with diesel engine | 22 |
| Power steering pump to steering gear pressure line | 25 |
| Steering gear retaining bolts | 100 |
| Steering gear supply and return lines | 10 |
Scheme 1
| Item Number | Description |
|---|---|
| 1 | Lower steering column |
| 2 | Power steering fluid reservoir |
| 3 | Power steering pump |
| 4 | Power steering fluid cooler |
| 5 | Power steering lines |
| 6 | Steering gear |
The vehicle uses a rack and pinion type, variable ratio steering gear with speed proportional servotronic. The power steering pump is belt driven on all model variants and the power steering oil cooler is of a tube and fin type and is mounted to the front of the cooling pack.
A variable steering rack ratio reduces the amount of turns from lock to lock to improve parking maneuvers without loosing any steering feel at higher speeds.
The steering assistance decreases smoothly at a calibrated rate to increase the steering efforts required as vehicle speed increases. The steering efforts are controlled by the actuator position, which in turn is controlled electronically by the speed proportional servotronic curve which is incorporated within the Generic Electronic Module (GEM).
Absolute cleanliness must be observed when replenishing the fluid or dismantling any part of the system. New fluid from a sealed container must be used.
Note. If the steering gear, pump or cooler are being replaced for leakage or noise related issues and there is no evidence of fluid contamination, there is no need to replace the reservoir.
In some cases where the fluid clearly contains particulate matter, and the system continues to function, flush the system with fresh fluid and replace the reservoir, as there is the possibility that the reservoir internal filter may be damaged or faulty.
For additional information, refer to Steering System - General Information article. .
Scheme 2
- Remove the air deflector. Refer to «Air Deflector»(ref-311270-S01637873752009032500000) article.
- Detach the steering gear.
- Disconnect the power steering control valve actuator electrical connector.
- Remove the power steering control valve actuator. Drain the fluid into a suitable container. Remove and discard the O-ring seals and filter.