Service Procedures Working Practices
SERVICE PROCEDURES
Working Practices
It is not recommended that either the steering rack or engine driven pump assemblies are repaired in any way other than in accordance with the repair procedures described in this section. The fluid reservoir and filter is a disposable assembly and no attempt should be made to clean it internally. Genuine replacement units must be fitted following routine service or diagnostic confirmation of the failure of any component.
The importance of cleanliness cannot be over-stressed, not only with new parts but also those which may have failed. In-service contamination of the hydraulic system is a major cause of failures and may be avoided with good working practices and care. All new units and pipes must be supplied with suitable blanks in every orifice. Should a unit not have blanks fitted, do not use it - return it to the supplier with an appropriate reason for your action.
To help the manufacturer diagnose problems and avoid post-removal contamination; provide full details of the fault and plug all connections as soon as they are released. All suspect units must be returned to Jaguar Cars complete with relevant documentation.
Caution: It is imperative that the power steering system does not become contaminated in any way. Always decant fluid from a fresh sealed container and clean the area around the reservoir neck both before and after topping-up. Never return drained fluid to the system.
Fluid Level Check and Top-up
Position the vehicle on a level surface with the engine stationary and fluid cold. Add fluid, if required, so that the level falls BETWEEN the marks Fig.1.
System Bleed (following maintenance)
To avoid fluid aeration and possible pump damage, the initial fill process must be carried out with the ignition OFF.
Set the fluid level approximately 20 mm above the upper dipstick level, and cycle the steering no less than three (3) times from lock to lock (this may be best achieved with the front wheels off the ground). As air is expelled the fluid level will fall, the level should be corrected. Start the engine and further cycle the steering until the fluid level becomes stable. Stop the engine and finally set the level in accordance with the fluid level check procedure.
Fluid Reservoir
The reservoir has an integral, non-serviceable, return-side filter. Should any major component be renewed, it is essential that the reservoir and the fluid are changed. Under normal operating conditions it is not necessary to change the fluid.
Hydraulic Connections
All hydraulic connections and surrounding areas should be scrupulously cleaned before and after work. Please note that the steering rack valve block connections for FEED and RETURN are common in size. Ensure that the pipes are correctly fitted, the uppermost one being the high pressure FEED from the steering pump and the lower (RETURN) having a double depth hexagon tube nut.
Working Precautions, Updated
The importance of cleanliness cannot be over-emphasized. The small orifices, seals and valves in the system are vulnerable to contaminants.
CAUTION:
It is imperative that the power-assisted steering system does not become contaminated in any way. Always decant fluid from a fresh sealed container and clean the area around the reservoir neck both before and after topping-up. Never return drained fluid to the system.
Fluid Reservoir
The reservoir has an integral, non-serviceable return side filter - do not attempt to clean it. Should any component be renewed or the system broken into for any reason, it is essential that the reservoir and the fluid are changed. Under normal operating conditions, fluid change is not required.
Lubrication Data
Fluid type:
Dexron III (Dexron IID or IIE when III is unavailable)
System capacity:
Approximately one litre (0.26 US gal) from dry
Level checking frequency:
16000 km (10000 miles)
Pressure:
100 to 110 bar (1450 to 1595 lb f/in2)