Hydraulic Unit, R Tronic Assembly Overview
Hydraulic Unit, R Tronic Assembly Overview
CAUTION!
There is a risk of injury. The pressure in the R tronic hydraulic system may be up to 50 bar.
• Always reduce system pressure first before working on the R tronic hydraulic system => [ Hydraulic System, R Tronic, Building System Pressure ] Procedures.
1 Hydraulic pressure line
• Depending on vehicle, there are different versions and tightening specifications
• Refer to => [ Hydraulic Pressure Line from Shift Actuator to R Tronic Hydraulic Unit ]
2 Bolt
• 24 Nm
3 O-ring
• Replace
4 Connectors on the R tronic shift actuator
CAUTION!
• Only replace if damaged.
• Refer to => [ Connections on R Tronic Shift Actuator ] Connections on R Tronic Shift Actuator
5 Rubber grommet
• Replace
6 Hydraulic return hose
• Replace
CAUTION!
• Always follow the removal instructions.
• Refer to => [ Hydraulic Return Hose ]
7 Rubber grommet
• Replace
8 Bracket
• An auxiliary Ground (GND) connection is installed on the top left.
9 Heat shield
10 Bolt
• 10 Nm
11 Bolt
• 6 Nm
12 Transmission Hydraulic Pump (V387) motor
• Refer to => [ Transmission Hydraulic Pump Motor ] Transmission Hydraulic Pump Motor
13 Connecting piece
14 Sponge
• Clean before reinstalling
15 O-ring
• Replace
16 O-ring
• Replace
17 Gasket
• Replace
18 Mechanical hydraulic pump
• Refer to => [ Mechanical Hydraulic Pump ] Mechanical Hydraulic Pump
19 Bolt
• 5.5 Nm
20 O-ring
• Replace
21 Bolt
• 10 Nm
22 Hydraulic oil reservoir
• Refer to => [ Hydraulic Oil Reservoir ] Service and Repair
23 Sealing cap
• 1.3 Nm
• Depending on the vehicle, there are different caps installed, with and without a vent hose.
• Leaky caps must be replaced with cap that has a vent hose. Cap, Removing and Installing => [ Oil Level in R Tronic Hydraulic Unit, Adjusting ] Oil Level In R Tronic Hydraulic Unit, Adjusting.
• Routing and attaching the cap vent hose, refer to => [ Cap Venting Hose Routing and Attaching ].
24 Pressure reservoir
• 55 Nm
• Refer to => [ Pressure Reservoir ]
• Loosen and tighten using only an Open End Spanner Insert AF 27 mm (T40156).
Cap Venting Hose Routing and Attaching
• The vent hose on the cap must be routed and attached according to the illustration - arrows -.
• Do not bend the vent hose and make sure there is enough space between the hose and the exhaust system.
Hydraulic Pressure Line
Depending on the vehicle, there are different versions of the line and the threaded connector.
Hydraulic Pressure Line Without the Brass Adapter
• Union nut - 1 - to the R tronic hydraulic unit - 18 Nm
• Union nut - 2 - to the R tronic shift actuator - 18 Nm
A damaged or leaky hydraulic line can be replaced by a hydraulic line with threaded adapters.
Hydraulic Pressure Line with Threaded Adapters
• Threaded adapter - 1 - to the R tronic hydraulic unit - 30 Nm
• Threaded adapter - 2 - to the R tronic shift actuator - 30 Nm
• Union nuts - 3 and 4 - to threaded adapter - 25 Nm
A damaged or leaky hydraulic line with threaded adapters can be only be replaced with a hydraulic line with threaded adapters.