Audi TT Roof Hydraulics

Pump
Pump

This is the hydraulic system from an Audi TT that would power the soft top. Here is the hydraulic pump unit. Oil Tank is on the left. Power is 12v DC at ~20A

Cylinders
Cylinders

The pair of hydraulic cylinders that attached to the roof mechanism.

Limit Switch
Limit Switch

One of the cylinders has a limit switch built in. The brass bolt coming out of the side of the head is one contact. The other contact is the cylinder body.

Hose
Hose

Marking on the hoses. This is Parker Polyflex hydraulic hose. 1/8″ ID.

Motor
Motor

Drive motor for the hydraulic pump. Standard DC permanent magnet motor.

Motor Suppression
Motor Suppression

Motor power terminals & suppression capacitors. As the reversing relays actually short the motor out when de-energized, there is a lot of arcing at the brushes without some suppression.

Reversing Relays
Reversing Relays

Reversing relay stack. Each relay is a SPDT configuration. The pair are arranged as a DPDT bank to reverse the motor, depending on which relay is energized.

Tank
Tank

Detail of the oil tank showing the level markings.

Power Valve
Power Valve

Solenoid valve on top of the unit. This valve provides full pump pressure to the cylinders when energized.

4 thoughts on “Audi TT Roof Hydraulics

  1. fabio gonçalves says:

    Meu carro está na Eurobike,e estou achando que não tem ninguem capacitado para trocar a bomba hidraulica.aceito sujestões de oficinas grande sp

    Reply
    1. Vanguard says:

      Comments in English please 🙂

      Google translate didn’t do a very good job on this, but from what I can tell you are saying that nobody is qualified to replace the pump at the garage your car is at?

      These pumps are not difficult to replace in the slightest. Anybody with some technical knowledge should be able to perform this task.

      Reply
    1. The Engineer says:

      Hi Russ,

      Honestly, I have no idea, as I did not obtain the pump from a car directly. Apologies for that. 🙂

      Reply

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