Contents: Disassembly ↡ Assembly ↡ Tandem Power Steering Pump - Models…↡ "Tandem" power steering pump ↡
Power steering pump (disassembled)
2 - Pump body; 3 - Plate; 4 - Flange; 6 - Cam insert; 7 - Rotor; 11 - Drive shaft; 13 - Seal; 16 - Blade; 18, 34a, 34b - Retaining rings; 21, 22, 26a, 26b, 44 - Sealing rings; 30, 43 - Springs; 32 - Flow control valve; 35 - Tank; 36 - Bolt; 41 - Filter; 45 - Lid; 47 - Ventilation cover; 60 - Plastic bushing; 61 - Nut
Speed Sensitive Power Steering Valve P (on the power steering pump, on the left in the engine compartment)
Power steering pump (assembly)
Disassembly
1. Unscrew ventilation cover 47 and remove cover 45.
2. Unscrew nut 61 from the support bolt, remove plastic sleeve 60, spring 43 and filter 41.
3. On Vickers/LUK pumps, reservoir 35 can be removed. Replace the sealing ring. On ZF pumps, it is cast together with the housing 2.
4. Unscrew bolts 25 and remove flange 4. Check the lower part of flange 4 for damage and wear.
5. Remove pressure plate 3 and cam insert 6.
6. Remove retaining ring 18c from drive shaft 11. Replace retaining ring.
7. Remove rotor 7 using a plastic hammer from drive shaft 11 together with blades 16 (10 pieces).
8. Remove drive shaft 11 from flange 4.
9. Using a screwdriver, press out radial seal 13c from flange 4.
34a - Vickers/LUK pump
34b - ZF Pump
10. Remove retaining ring 34a or 34b.
11. Remove the fluid flow control valve 32 and spring 30 from the pump body 2.
12. Secure the fluid flow control valve 32 in a vice and unscrew valve 53 from the excess pressure valve.
13. Remove the sealing cone 51 and spring 50. Check the contact surfaces of the liquid flow control valve 32 and the hole in the pump body for wear or damage. If wear of the sealing surfaces is detected, the pump must be replaced.
14. Check both sealing cones. Replace the worn cone.
Assembly
1. Before assembly, lubricate all parts with oil. Replace all sealing rings. If a new fluid flow control valve 32 is installed, pay attention to the correct opening pressure of the excess pressure valve.
2. Assemble the fluid flow control valve 32, securing it in a vice and tighten the valve 53.
3. Insert spring 30 and liquid flow control valve 32 into pump body 2.
4. Install retaining ring 34a or 34b.
5. Install the new seal into the flange using a drift.
6. Further installation is carried out in the reverse order of removal.
7. After assembling the pump, check that the pump operates correctly and that there are no liquid leaks. If necessary, check the working pressure of the pump.
Tandem Power Steering Pump - Models 62, 162
Tandem type power steering pump disassembled
2 - Pump body; 3 - Pressure plate; 4, 14 - Flanges; 5, 12 - Thrust washers; 6 - Cam insert; 7 - Rotor; 11 - Drive shaft; 13, 27 - Radial seals; 15a - Eccentric; 15b - Bushing; 16 - Blade; 17, 19, 20 - Fingers; 18 - Retaining ring; 21, 22, 26b, 39, 39a - Sealing rings; 25, 36 - Bolts; 27 - Seal; 28 - Gasket; 30, 38, 43 - Springs; 32 - Liquid flow control valve; 35 - Reservoir; 37 - Piston; 40 - Screw cap; 41 - Filter; 45 - Lid; 46 - Support bolt; 47 - Ventilation cover; 60 - Plastic bushing; 61 - Nut
Tandem Power Steering Pump - Assembled
The Tandem type power steering pump - models 62, 162 are shown in the illustrations.
Disassembly
1. Unscrew ventilation cover 47 and remove cover 45.
2. Unscrew nut 61 of support bolt 46. Remove plastic sleeve 60, spring 43 and filter 41.
3. Unscrew bolts 36 of pump body 2. Remove reservoir 35 and sealing ring 21.
4. Unscrew bolts 25 and remove the flange. Check the flange mating surface for wear and damage.
5. Remove the pressure plate 3.
6. Remove cam insert 6. Check the contact surface of the pressure plate, as well as the sliding surfaces of the blades on cam insert 6 for wear and tear.
7. Remove retaining ring 18 from the drive shaft. Replace the retaining ring.
8. Remove rotor 7 from drive shaft 11 using a mallet and remove blades 16 (10 pieces). Check blades 16 in the slots of rotor 7; they should slide easily in the rotor.
9. Remove thrust washer 5.
10. Unscrew all four nuts 40 from the pump body using a 010 wrench.
11. Check the seals 39 and replace them if necessary. Remove the piston 37 and spring 38 from the plug 40. Check the piston and piston guide for signs of wear and damage. If the piston moves in the guide with noticeable difficulty, the plug must be replaced.
12. Knock out pin 19 from the pump body using a punch.
13. Remove drive shaft 11 together with sleeve 15b and flange 14 from the pump housing.
14. Remove bushing 15b and check it.
15. Knock out pin 17 with a punch and remove eccentric 15a. Remove thrust pad 12 and check its condition. Remove flange 14 from drive shaft 11.
16. Using a screwdriver, remove radial seal 13 from the flange. Replace sealing ring 39a.
17. Check the bearing surfaces (arrows) on the drive shaft for wear or scoring.
18. Check the radial seal 27 in the pump body. If liquid is found on the pump, the probable cause is leaking seal 27.
19. Remove the radial oil seal and gasket 28 using a puller. Check the bronze bushing in housing 4 for signs of wear and damage and replace it if necessary.
20. Remove the retaining ring 34a. When removing the retaining ring, make sure that the pump body is not damaged.
21. Remove the fluid flow control valve 32 and spring 30 from the pump body 2.
22. Secure the fluid flow control valve 32 in a vice and unscrew valve 53 from the excess pressure valve.
23. Remove the sealing cone 51 and spring 50. Check the contact surfaces of the liquid flow control valve 32 and the hole in the pump body for wear or damage. If wear of the sealing surfaces is detected, the pump must be replaced.
24. Check both sealing cones. Replace the worn cone.
Assembly
1. Assembly is carried out in the reverse order of removal.
2. After assembling the pump, check that the pump operates correctly and that there are no liquid leaks. If necessary, check the working pressure of the pump.
"Tandem" power steering pump
2 - Pump body; 2b, 2c - Liquid flow control valve; 2d, 5d, 35g - Springs; 2g, 4f, 4h, 5a, 5b, 35a - Sealing rings; 4 - Pump body; 4a - Flange cover; 4b, 4c - Bolts; 4d, 4e - Radial oil seals; 5 - Piston support ring; 5c - Piston; 5f - Bushing; 5g - Bearing; 6 - Cam insert; 6a. - Fingers; 7 - Rotor; 7a - Blades; 8 - Pressure plate; 8a - Seal; 8b - Gasket; 11 - Drive shaft; 11 a - Retaining ring; 35 - Tank; 35c - Ventilation cover; 35d - Lid; 35th - Nut; 35f - Plastic bushing; 35g - Spring; 35h - Filter
1. The Tandem type power steering pump is shown in the illustration.
2. Remove sealing cone 51 and spring 50.
Attention! On some models, tank 35 can be mounted on bracket 1a, which in turn is screwed to pump 1.
Disassembly
1. Loosen the clamp, disconnect the tube (arrow) and secure it to the side. Unscrew bolts 46 and remove pump 1 from bracket 1a.
2. Unscrew the bolts (4 pieces). Remove the cover 2k, check the sealing ring 2g, replace it if necessary.
3. On some models, pump 1 has an expansion tank for regulating oil in tank 35, located between the thermostat and the intake manifold.
4. Oil level indicator 36a with "min" and "max" marks for checking the oil level is located on the cover of expansion tank 36.
5. Unscrew the four bolts 35a securing the reservoir 35 and remove it. Check the sealing ring 2g, replace it if necessary.
6. Unscrew the ventilation cap 35c and remove the cover 35d.
7. Unscrew nut 35e from support bolt 35i. Remove plastic bushing 35f, spring 35g and filter 35h.
8. Unscrew bolts 4b on flange 4 and remove pump housing 2.
9. Remove sealing ring 4h from flange 4, check and replace if necessary. Remove pressure plate 8. Check oil seal 8a and conical gasket 8b and replace oil seal if necessary.
10. Remove cam insert 6 and pins 6a. Check the surface of the pressure plate and the sliding surface of the blades on the cam insert for wear or damage.
11. Remove retaining ring 11a from drive shaft 11. Replace retaining ring.
12. Remove rotor 7 from drive shaft 11 using a plastic hammer and remove all blades 7a (10 pieces).
13. On ZF pump: remove drive shaft 11 from flange 4. On Vickers/LUK pumps: first remove 10 vanes, then remove drive shaft with flange cover.
14. Check the drive shaft for scoring and wear on the bearing surfaces (arrow). Replace if necessary.
15. Unscrew bolts 4c (8 pieces) and remove flange cover 4a. Check radial oil seal 4d and replace it if necessary.
16. Replace sealing ring 5a. On ZF pump: remove sleeve 5f and bearing 5g. On Vickers/LUK pumps: remove retaining ring from drive shaft, remove gasket and sleeve 5f from bearing 5g.
17. Remove piston 5c and spring 5d. Check the piston and spring for wear and damage.
18. Remove gasket 5h from the ZF pump housing.
19. Fix flange 4 between two wooden blocks so that ring 5 can be removed.
20. Replace sealing ring 5b.
21. Replace the sealing ring 4f and the cone ring 4g in the pump housing. Check the radial seal 4e and replace it if necessary.
22. Remove radial oil seal 4e using a puller. Check the bronze bushing in housing 4 for damage and wear and replace it if necessary.
23. Remove the fluid flow control valve 2c and spring 2j from the pump body 2.
24. Secure the fluid flow control valve 2c in a vice and unscrew valve 2e from the excess pressure valve.
25. Remove the sealing cone 2f and spring 2d. Check the contact surfaces of the fluid flow control valve 2c and the bore in the pump body for wear or damage. If wear of the sealing surfaces is detected, the pump must be replaced.
26. Check both sealing cones. Replace the worn cone.
Assembly
1. Assembly is carried out in the reverse order of removal.
Text republished from the website MercedesMAN.ru
2. After assembling the pump, check that it operates correctly and that there is no fluid leakage. If necessary, check the working pressure of the pump.