Checking Hydraulic Oil Level; Hydraulic Pump - Porsche Cayenne V6 2008 Service Information

Body
Notes
Even when the cylinder is extended, the
spring is still pretensioned by more than
1000 N.
Page 5.10

Checking Hydraulic Oil Level

Before checking oil, open and close rear lid 2-3 times automatic to
remove any air in the system.
• High oil level – Pressure in the tank could be too high during manual
operation!
• Low oil level – Pump noises due to air in system, incomplete opening
and closing function!

Hydraulic Pump

The hydraulic pump comprises an electric motor, the actual pump and
an oil tank. The pump is packed in a sound capsule to reduce noise and
is secured in the rear left wheel housing by a support.
A - Tank
B - Pump
C - Electric motor
The spring-supported hydraulic cylinder is connected to the pump by
quick connectors. Pressure loading of the cylinder on the piston side
drives the cylinder out. Pressure is applied to the rod side by reversing
the poles of the electric motor. The control unit for rear lid hydraulics
reverses the poles. A maximum pressure of up to 2900 psi (200 bar)
exists in the system. The pressure in the system must not exceed 72
psi (5 bar) when removing/installing the quick connectors, otherwise the
connectors can be damaged. The automatic rear lid system also has
diagnostic capabilities.
Removing the quick connectors.