Stuck, won't move ...
 

After messing around for two days, I got the 190e r. rear window motor, winder assembly etc back together. Was corroded, ucky etc.

All is cleaned and lubed. The cables are on the spool, cover on and the motor pulls in both directions but the window will only go up or down a little bit. I can pull it down a bit ....

Any wisdom to share at this point?

window motors
 

i just spent today replacing my drvr door motor[87 420sel]. but before i installed the new one i played a bit to see how the motor worked.

what i found was the motor on my 126 would turn in either direction as long as the switch was on. so that tells me that these motors do not have any limit switch or a switched shut off. what i believe is these small 12v motors torque out. there is a physical mechanical stop on the regulator assy for the down position and for the up is the window's door seal itself. i see this torque out/off in valve automation when electric motors have been undersized for a specific application.

what i have also seen on DC motors is they lose strength or power over time. all of my CNC machines have DC motors on the table and quill. in fact just had one go out on friday. likely it was only a diode but every so often these motor need to be repaired by the factory due to loss of power.

after all this said i'd look at the motor for a torque shut down. i would think if the motor begins to move then stops but you can make it go back in the opposite direction the motor is seeing more torque required than it can produce.

i would look at issues like... is the window moving freely up and down the tracks. the window could be getting wedged or it is shifting around and not moving evenly up or down. so... if it is not a mechanical issue then you only have the motor to point your finger at. my motor had 12v plainly displayed. one last thing is to get your vom meter and measure the dc volts at the motor's wiring.

good luck!

Thanks Craig-

The motor seems to have a lot of power. During repairs I did move the window by hand in the track. I checked the brushes and the armature and both looked very good.

Haasman

I believe that not all of them 'torque out', depending on the model and age - some just keep trying to wind the window until you let go of the switch.

Worth keeping in mind.

Thanks for the input. I will try removing the power/motor/lift link from the glass and make sure it moves properly, then try and sleuth out why the motor is not moving the glass.

Glass moves .... anyone every rebuild the motor/cable reel before?