Power Steering Components: Description and Operation
Power Steering Components
=> [ Power Steering System Overview ]
=> [ Power Steering Pump Assembly Overview ]
Power Steering System Overview
The power steering pump is not designed to be serviced. If a customer has reported a problem, determine the cause via a pressure test and leak test. If there is a malfunction, replace the pump.
• If the fluid is low in the reservoir, always check the steering system for leaks.
• If there are leaks in the area of the line connections, the lines/connections must first be inspected for leaks, tightened as necessary and wiped dry.
• The pump is delivered without fluid. Therefore, the pump must be filled with hydraulic fluid before installation and turned by hand. Otherwise, noises when driving or damage to the pump may occur.
1 Power Steering Gear
2 Pressure Hose
3 Union Nut, 45 Nm
4 Check Valve
• Pressed into the pressure hose - item 2 -.
5 Cap with Dipstick
6 Bolt, 9 Nm
7 Rubber Bushing
• For the reservoir.
8 Reservoir
• Fill with the hydraulic fluid.
• Install the reservoir in the bracket.
9 Clamp
• Tension using the hose clamp pliers (VAG 1275) or locking pliers (VAS 6199).
• Always replace.
10 Bolt, 20 Nm
11 Bracket
• For the reservoir.
12 Washer
13 Return Hose
• Between the reservoir and hydraulic oil cooler.
• Installed location on the reservoir, refer to => [ Suction Hose Installed Position ] Power Steering Components.
14 Hydraulic Oil Cooler
15 Power Steering Pump
• Fill with hydraulic fluid before installation.
• Check the ribbed belt alignment after replacing, refer to => [ Checking and Adjusting the Belt Pulley Alignment ] Power Steering Components.
• Checking delivery pressure, refer to => [ Power Steering Pump, Checking Delivery Pressure ] Power Steering Pump, Checking Delivery Pressure.
• Removing and installing, refer to => [ Power Steering Pump Assembly Overview ].
16 Seal
• Always replace.
17 Banjo Bolt, 47 Nm
18 Pressure Line
• Follow the installation of the return hose/pressure line in the front longitudinal member area.
19 Suction Hose
• Between the reservoir and the power steering pump.
• Installed position on the reservoir and power steering pump. Refer to => [ Suction Hose Installed Position ] Power Steering Components.
20 Return Hose
• Between the Servotronic steering gear and the hydraulic oil cooler.
• Follow the installation of the return hose/pressure line in the front longitudinal member area.
• Follow the assembly on the front end.
• Follow the installation on the radiator.
Bracket/Reservoir Installed Position
The bracket - 4 - with the reservoir is located near the level control system air supply unit - 2 -.
1 Bolt, 20 Nm
3 Washer (only for the front bolt)
To replace the reservoir, remove the following parts:
• Left front section of the front wheel housing liner.
• Left air filter.
• Bring the lock carrier into the service position. Radiator Support
Installing the Reservoir in the Bracket
- Insert the reservoir - 1 - with the rubber bushings - 4 - into the bracket - 3 -.
- Tighten the bolt - 2 - to 9 Nm.
Follow the Installation of the Pressure Line/Return Hose in the Front Longitudinal Member Area
- Secure the cable ties - 2 - on the pressure hose - 1 -.
Dimension - a - must be 70 mm.
- Secure the cable ties - 4 - on the return hose - 3 -.
Securing the Return Hose to the Front End
- Secure the return hose - 3 - with the bracket - 2 - and cable ties - 4 - to the front end - 1 -.
- Secure the return hose - 3 - with the bracket - 6 - to the Secondary Air Injection (AIR) pump bracket - 5 -.
Securing the Suction Hose to the Radiator
- Secure the return hose - 1 - to the radiator - 3 - using cable ties - 2 -.
Power Steering Pump Assembly Overview
• Always replace the seals.
• Do not reuse the fluid you have drained.
• Only use hydraulic fluid.
• When replacing the power steering pump or pump bracket, check the alignment of the Air Conditioning (A/C) compressor pulley and the power steering pump.
1 Power Steering Pump
• Fill with hydraulic fluid before installation.
• Checking delivery pressure, refer to => [ Power Steering Pump, Checking Delivery Pressure ] Power Steering Pump, Checking Delivery Pressure.
• Removing and installing, refer to => [ Power Steering Pump ] Power Steering Components.
2 Shim
• Different versions
3 Power Steering Pump Pulley
4 Bolt
5 Bolt, 23 Nm
6 Bracket
• Check the ribbed belt alignment after replacing, refer to => [ Checking and Adjusting the Belt Pulley Alignment ] Power Steering Components.
7 Sleeve
8 Bolt, 23 Nm
9 Sleeve
10 Bolt, 32 Nm
11 Seal
• Always replace.
12 Banjo Bolt, 47 Nm
13 Pressure Line
• Note the installed position: The angle between the line connection and the pump axle is approximately 7 degrees.
14 Suction Hose
• The - P - mark on the intake hose must align with the seam on the pump.
15 Clamp
• Tension using the hose clamp pliers (VAG 1275) or locking pliers (VAS 6199).
• Always replace.