WM 489819 Removing And Installing Hydraulic Pump (PDCC) (Except Cayenne Turbo S, Cayenne Diesel): General

WARNING: This page is about a different car, the 2010 Porsche Cayenne, 2009 Porsche Cayenne, and 2008 Porsche Cayenne. However, it is still accessible from the selected car via links, so may be relevant.

Information

The rack-and-pinion steering gear and power-steering pump must not be repaired or dismantled!
Always replace the O-rings on hydraulic lines!
Ensure absolute cleanliness at all times!
The steering system must be flushed after replacing individual or multiple components. Additional components must be replaced.
The reservoirs must always be replaced if the hydraulic pump is replaced.
If system faults still occur after replacing a component (another component is defective), the reservoir does not have to be replaced again.
Steel flexi-pipes must not be kinked or crushed.

Fig 1: Locating Hydraulic Pump On Engine
Courtesy of PORSCHE CARS NORTH AMERICA, INC.

Damage to the power steering will occur if there is a shortage of oil in the hydraulic system. Even small leaks can cause the hydraulic fluid to escape and damage the servo pump as a result of high oil pressure occurring in the hydraulic circuit.

Grunt-like noises that can be heard when the steering is locked, or foam formation in the reservoir indicate a shortage of oil and/or that air has also been sucked in. Before filling the reservoir, any existing leaks must be eliminated on the suction side. Alternatively, the defective part on the pressure side should be replaced.

CAUTION: Increased risk of accidents and material damage if too much Pentosin CHF 202 is filled in or if Pentosin CHF 202 comes into contact with the coolant hoses when filling or topping up.

It is possible to overfill the system, causing Pentosin CHF 202 to overflow onto coolant hoses and other components.

→ Start and run the engine for about 20 seconds prior to the fluid level check. Multiple steering operations (manoeuvring) will change the fluid level in the reservoir. Check the fluid level.

→ If coolant hoses come into contact with Pentosin, clean them thoroughly with water IMMEDIATELY.

→ Replace visibly swollen coolant hoses.