- screwdriver
- consistent grease
- fine sandpaper
Before you start: Remove the windshield wiper (see subsection 8.8.1.).
The windshield wiper marking is located on the gearbox housing cover.
Data for testing the windshield wiper motor on the stand:
- rotation frequency of the electric motor shaft at a supply voltage of 14 V, load torque of 1.47 N/m (0.15 kgf/m) and ambient temperature (25±10)°C – not less than 50 min⁻¹;
- the current consumption at a given load moment is no more than 3.5 A.
When repairing a windshield wiper, the manufacturer allows for the replacement of the gear reducer, cleaning of the collector and rotor shaft. For all other faults, it is recommended to replace the gear motor assembly.
1. Remove the rubber seal from the gearmotor housing...
2....a plastic sleeve and...
3....stop bracket.
4. Remove the four screws securing the windshield wiper cover.
5. Remove the wiper cover with gasket.
6. Remove the retaining ring from the wiper shaft...
7....two metal washers and...
8.... sealing ring.
9. Remove the crank assembly from the gearbox housing.
10. Remove the flat washers from the gear shaft and...
11....from the connecting rod axis.
12. Remove the plastic gear from the housing.
13. Remove the flat washer from the pinion shaft.
14. Unscrew the two screws securing the electric motor housing.
15. Please note: There are spring washers installed under the screws.
16. Remove the two cap nuts.
17. Remove the electric motor from the gearbox housing.
18. Remove the electric motor rotor from the housing.
19. Remove the plastic support sleeve from the rotor axis. Replace the worn sleeve.
20. Replace the crank assembly if the sector teeth are broken, or if the splines or threads on the shaft are damaged.
21. Replace the gear reducer with severely worn or damaged teeth.
22. Inspect the contacts of the limit switch of the self-stop mechanism on the gear. Clean the oxidized contacts. Replace the gear with damaged contacts.
23. Inspect the rotor shaft. If you find signs of seizure on the shaft journals, clean them with fine sandpaper.
24. Clean the collector with fine sandpaper if it is dirty or has marks, scratches or other damage. After that, carefully wipe the collector with a clean cloth, if possible, blow it with compressed air. If the collector is heavily worn or burnt, replace the rotor.
25. Check the ease of movement of the brushes in the brush holder. They should move freely, without jamming.
26. Replace worn or chipped brushes.
27. Replace broken or weakened brush springs.
28. Replace the damaged gearbox housing cover gasket.
29. Before assembling the wiper, clean and blow out the cavities of the electric motor housing with compressed air to remove carbon dust.
30. Press the brushes into the brush holder until they stop and secure them in this position with wire.
31. Carefully insert the rotor into the gearbox housing.
32. Install a flat washer onto the pinion shaft.
33. Install the gear reducer with the contact ring inside the housing.
34. Remove the wire holding the brushes.
35. Adjust the brush terminals so that they do not touch the motor housing ("ground").
36. Install the electric motor housing and secure it with screws. The housing is installed in one position: the protrusion on the gearbox housing must fit into the slot on the electric motor housing.
37. Assemble the windshield wiper in the reverse order of disassembly, lubricating the worm 1 of the rotor shaft, gear 2 of the gearbox and crank assembly 3 with consistent grease.