1. Disconnect the wire from the terminal «–» battery.
2. Turn both brush arms to the vertical position and unscrew the nuts securing them.
3. Remove the brush arms from the wiper rollers
Note. If the lever cannot be removed by hand, unscrew the lever fastening nut without unscrewing it completely so as not to damage the threads. Using pliers, pry the lever off the shaft splines, completely unscrew the nut and remove the lever.
4. Remove one protective cap from both sides.
5. Turn away on one nut of the top fastening of an arm from both parties.
6. Remove the rubber leveling washers on both sides.
7. Open the hood and disconnect the windshield wiper harness connector. Then move the heater fan to the right in the compartment in front of the windshield (see «Removal and installation of the heater fan»), otherwise it will interfere with the removal of the wiper.
8. Remove the cover of the relay and fuse mounting block by pressing the cover latches.
9. Remove all relays from the block so that they do not interfere with the removal of the wiper.
10. Turn out a bolt of the bottom fastening of an arm of a screen wiper.
11. Squeeze the plastic wire holder and remove it from the hole in the body.
12. Remove the holder from the wires so as not to lose it.
13. Remove the rollers of the wiper mechanism from the holes in the body.
14. Move the wiper so that its motor is in the wide part of the compartment in front of the windshield (heater fan installation location). Turning the wiper, remove its engine from the compartment. Slide the wiper towards the relay and fuse box and remove it from the compartment.
15. Turn away a nut of fastening of a crank of the mechanism of a screen wiper …
16.... and remove the crank from the gearbox shaft by prying it with a screwdriver.
17. Turn out three bolts of fastening of a reducer with the electric motor.
18. Turn out two screws of fastening of wires of the electric motor and disconnect wires from the thermobimetallic fuse. Remove the engine from the bracket.
19. Remove the circlip from the gearbox shaft.
20. Remove the shims from the gearbox shaft.
Note. Mark the shims so that they are installed in the same places and in the same quantity during assembly.
21. Turn out three screws of fastening …
22.... and remove the gearbox cover.
Warning! When disassembling, do not turn out the adjusting screw, otherwise the axial clearance of the armature shaft will be violated.
23. Remove the panel from the gearbox.
24. Take out a gear wheel of a reducer.
25. Remove two screws (the second is behind the gearbox housing) …
26.... and remove the two cage nuts.
27. Remove the gearbox housing with brush holder from the motor housing.
28. Remove the anchor from the motor housing. After disassembly, blow out the motor housing with compressed air to remove coal dust.
29. Remove the retaining rings from both rollers of the wiper mechanism..
30.... and shims.
31. Take out drafts from an arm of a screen wiper and remove adjusting washers from both rollers.
32. Remove the O-rings from the grooves on both sides of the bracket.
Note. Further disassembly of the linkage system is impossible, since the links are of a non-separable design: 1 - crank; 2 - short thrust; 3 - hinge rods; 4 - rollers of the wiper mechanism; 5 - long traction.
33. If the brush springs are damaged or have lost elasticity, replace them.
34. Check the ease of movement of the brushes in the brush holder. They should move freely, without jamming. Replace worn or chipped brushes. When replacing, solder the leads of the new brushes to the brush holder
35. Clean the collector with fine-grained sandpaper if it is dirty or has marks, scratches, etc. on it. If the commutator is badly worn or burnt, replace the armature or gearbox with electric motor assembly. If there are signs of jamming on the necks of the anchor, clean the necks with fine-grained sandpaper.
36. Replace gear with severely worn or broken teeth.
37. Straighten bent rods. If this is not possible, replace the linkage assemblies.
38. If splines or pin threads are damaged, replace linkage assemblies.
39. Clean burnt or oxidized contacts of the self-stop mechanism with fine-grained sandpaper.
40. Replace torn, cracked, or loose rubber pads and other rubber parts.
41. Assemble and install the wiper in reverse order, taking into account the following:
- make sure that when installing the armature in the housing, a thrust ball is installed in the shaft recess;
- when assembling the gearbox, lubricate the gearbox gear and the worm of the motor shaft with grease;
- when installing the rods in the bracket, lubricate the rollers with grease;
- install the crank parallel to the short rod, it must be directed towards the electric motor.
42. Install the windshield wiper in the reverse order of removal.