Power Steering Pump — Removal and Installation (Mercedes-Benz C-Class W201)

Models produced before October 1984

Removal

1. Unscrew and remove the system tank cap.

2. Unscrew the nut from the long stud in the center of the tank, then remove the spring from the stud.

3. Remove the filter from the tank.

4. Using a clean syringe, remove the liquid from the reservoir.

5. Unscrew the fittings, then remove the fluid supply and drain tubes from the side of the pump (see fig. 24.5). Be prepared for some liquid to spill. Plug or cover any open holes to prevent dirt from getting in.



6. Loosen the adjusting bolt on the rear of the pump bracket to allow the pump to be moved forward, releasing the drive belt tension (see fig. 24.6).



7. Remove the drive belt from the pump pulley.



8. Unscrew the three bolts and remove the pulley from the pump shaft (see fig. 24.8).



9. Remove the two mounting bolts at the rear of the pump bracket and remove the threaded mounting plate at the front (see fig. 24.9).

(Material based on data from the portal: «MERCEDESMAN»)



10. Loosen and remove the adjusting lock bolt at the rear of the pump, then remove the lock nut and adjuster gear.

11. Remove the pump from the engine.

Installation

12. Install the pump in reverse order, taking into account the following points:

• a) After installing the drive belt, adjust the tension as described in Chapter 1A or 1B.
• b) When installing the filter spring and nut, tighten the nut to compress the spring.
• c) When finished, fill the tank with the required liquid in the required amount, then start the engine and turn the steering wheel right and left several times until it stops. Check the liquid level and top up if necessary. Repeat the procedure until the liquid level stops decreasing. Install the cap and cap nut.

Models produced after October 1984

Removal

13. Apply the parking brake and raise the front of the vehicle with a jack and place it on supports (see "Raising and placing the vehicle on supports").

14. Proceeding as described in Chapter 1, loosen the drive belt tension and remove the belt from the pump pulley, keeping in mind that before loosening the belt, it is necessary to loosen the pulley mounting bolts.

15. Where necessary, remove the air bleeder to improve access to the pump (see Chapter 4).

16. Loosen the mounting bolts and remove the pulley from the power steering pump, remembering how it is installed.

17. Wipe clean the area around the fittings and apply identification marks to the pump tubes and hoses.

18. Loosen the union nuts and disconnect the hoses from the pump. Be prepared for some fluid to spill and place a container under the hoses when loosening the nuts. Plug the ends of the tubes and the holes in the pump to prevent fluid from spilling and contaminating the hydraulic system.

19. Where necessary, loosen the bolts and remove the bracket from the rear of the pump.

20. Loosen and remove the power steering pump mounting bolts. Remove the pump from the engine compartment.

21. If the pump is faulty, contact your Mercedes-Benz dealer for spare parts. If spare parts are available, the pump can be repaired or replaced with a reconditioned one. If spare parts are not available, the pump will have to be replaced.

Installation

22.. Install the pump and tighten the mounting bolts to the required torque. If necessary, install a support stand at the rear of the pump.



23. Using the marks made during removal, connect the hoses to the pump and securely tighten the union nuts.

24. Install the pulley onto the pump, making sure it is installed correctly. Tighten the mounting bolts to the required torque.

25. Install the drive belt and tension it as described in Chapter 1.

26. When finished, prime the pump and bleed the hydraulic system as described in paragraph 25.