I just dismount a micro motor for the electric windows. I need to lubricate it. Which is the best way to lubricate the gears? I saw that there is plastic outside. I will not use the MoS2 grease.

enter image description here


I don't have the picture available but I found a similar one gearbox dismounted.

enter image description here

  • 1
    You need to find out what the material the gears are made of. The needed type of grease depends heavily if the material is some plastic (possible ptfe enriched?) or metal – Martin Oct 15 '20 at 13:39
  • The gears are in stainless steel – Daniele Oct 15 '20 at 13:54
  • Are you sure? Usually these have plastic gears. – jwh20 Oct 15 '20 at 17:00
  • I think the best course of action would be to disassemble the entire thing, post photos and describe your entire problem, including the symptoms. Why do you want to exclude MoS2? – Martin Oct 16 '20 at 7:45
  • MoS2 is not compatible with plastics – Daniele Oct 16 '20 at 7:53

This is a difficult question as many greases affect plastics. A silicone grease, most likely to be compatible with plastics, won't provide enough lubrication for the metal gears. In your case I'd try to source some ptfe grease, specified for metal/plastic applications.

It is important to disassemble the gear and painstakingly clean the gear from debris or old grease. Also avoid brake cleaner on the plastic parts..

  • It would be better an oil or grease? – Daniele Oct 16 '20 at 7:30
  • 1
    In general oil lubrication is better for gears, but more difficult to seal. The best would be the same lubrication as the original one. Also leaking oil (or wrong grease/oil) can make significant damages.. – Martin Oct 16 '20 at 7:43

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.