E-320 Windshield wiper motor

[BS E-320]

I've got a windshield wiper on my 1994 E-320 that is slipping and barely makes the return sweep. Do you think it's the motor or could there be something else? Could it be the threads on the shaft or the wiper arm? The blade is fairly new.

[Jackd]

Could be the motor, could be poor lubrication of the mechanisim

[tmorales]

Try tightening the nut under the cap where the wiper arm meets the car. the cap should just pop open with one side attached to the arm with a hinge.

[y2kimmel]

If you've never done it before - removing the wiper transmission cover(s) and cleaning and lubing the linkage would be a good idea. My wiper had similar problems before I did this.

Troy
1995 E420 91k

[BS E-320]

I removed the wiper arm, but don't see how the transmission cover comes loose. Does it snap on? I tried several angles, but didn't want to break anything.