Hullo everyone!
University just started this week so will only have the weekends to handle car related repair.
Wiper has been really sluggish.
It moves really slowly even on high.
We are approaching monsoon season and heavy rain is frequent so will need to fix it before allowing the car back on the road again...
Wiper blades are new bosch units.
Wiper arm spring tension is fine.
Have checked the electrical contact at the wiper motor, cleaned it, no luck, still too slow.
Have checked for full 12 volt at the connector and it is present. so likely not an electrical fault
So decided to remove the wiper motor for inspection.
In the process manage of removing the motor, I unfortunately damaged the rubber cover of the wiper linkage bushing (just the rubber, not the bushing. rubber is very crispy due to age)
With the wiper motor out, the wiper linkage move freely with minimal resistance with the wiper arms up, so linkage is probably fine.
I have tied a string on the motor side of linkage to fish it back up from the hole later.
Inside the gearbox section of the motor, grease is pretty much caked and has consistency of wax, so will need to clean it up and replace with fresh grease.
The rotor (armature?) looks fine, no burnt windings or broken copper wire, have yet to do a resistance check with multimeter.
Carbon brush is still plenty (at least 4mm left).
Brush holder and brush spring is fine.
So have got a few questions:
1. What kind of grease should be used for the gear box section?
The gear is made of plastic and have heard using the wrong kind of grease will cause the plastic to fail prematurely.
It will be metal-plastic contact.
I have nothing on hand now except silicone dielectric grease for rubber. (too thin for the job)
My tub of MP grease is contaminated with sand due to a mistake few months back.
So will need to buy some...
2. The rotor (armature) is supported 1 side by ball bearing and the other by bronze bushing, what kind of lubrication should be used for the bronze bushing? Oil or grease?
Have tried both in the past on small motors and gotten mixed result.
Have tried searching and the internet is divided into 2 camps too haha.
Any pointers would be much appreciated!
-tea
University just started this week so will only have the weekends to handle car related repair.
Wiper has been really sluggish.
It moves really slowly even on high.
We are approaching monsoon season and heavy rain is frequent so will need to fix it before allowing the car back on the road again...
Wiper blades are new bosch units.
Wiper arm spring tension is fine.
Have checked the electrical contact at the wiper motor, cleaned it, no luck, still too slow.
Have checked for full 12 volt at the connector and it is present. so likely not an electrical fault
So decided to remove the wiper motor for inspection.
In the process manage of removing the motor, I unfortunately damaged the rubber cover of the wiper linkage bushing (just the rubber, not the bushing. rubber is very crispy due to age)
With the wiper motor out, the wiper linkage move freely with minimal resistance with the wiper arms up, so linkage is probably fine.
I have tied a string on the motor side of linkage to fish it back up from the hole later.
Inside the gearbox section of the motor, grease is pretty much caked and has consistency of wax, so will need to clean it up and replace with fresh grease.
The rotor (armature?) looks fine, no burnt windings or broken copper wire, have yet to do a resistance check with multimeter.
Carbon brush is still plenty (at least 4mm left).
Brush holder and brush spring is fine.
So have got a few questions:
1. What kind of grease should be used for the gear box section?
The gear is made of plastic and have heard using the wrong kind of grease will cause the plastic to fail prematurely.
It will be metal-plastic contact.
I have nothing on hand now except silicone dielectric grease for rubber. (too thin for the job)
My tub of MP grease is contaminated with sand due to a mistake few months back.
So will need to buy some...
2. The rotor (armature) is supported 1 side by ball bearing and the other by bronze bushing, what kind of lubrication should be used for the bronze bushing? Oil or grease?
Have tried both in the past on small motors and gotten mixed result.
Have tried searching and the internet is divided into 2 camps too haha.
Any pointers would be much appreciated!
-tea
