This might help-

It is from a "How to repair a mono-wiper"

Tools needed for repairing the wiper arm

-Small mirror
-Dental pick or small Allen wrench

Instructions:

-Raise the hood for improved access.

-With the ignition off, rotate the wiper switch to the first position.
-Turn the ignition on and off rapidly, so as to move the wiper arm out of the park position.

-Move the arm manually to the straight up position.

-Remove the three-sided rectangular cover (lower end of arm) that extends over the cap by pulling it straight up from the bottom end.

-Using a sensitive fingertip or a dental mirror, locate the two small recessed rectangular openings on the underside of the cap at roughly the 5 and 7 o'clock positions.

-Using a tool with a 90 deg end such as a dental pick or a small Allen wrench, release the catches in the access holes while pulling the cap upward with the left hand.

-Now that the entire articulated wiper actuator is in plain view, you will see as I did that the shaft that extends the arm up into the windshield corners (twice per sweep) is very likely no longer lubricated.

-Remove all the old grease from the shaft and bushing using for example a cloth soaked with lacquer thinner or similar, moving the arm back and forth to expose the arm surfaces inside the bushing.

-Apply new lubricant and I don't mean WD-40. I used Sil-Glyde, a silicone grease which has a working temp range of -20 to +400 deg F.

-Reassemble in reverse order.

_______________
Haasman

__________________
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)

Thats the description for the newer assemblies. The older assemblies have no catches underneath the rectangular housing and you have to remove the mouldings as stated.

With a small allen wrench inside the holes, I cannot seem to "feel" any catches inside to release. Can someone provide a little more detailed info on the proper technique to find and release these catches?

Good stuff haasman. Hopefully these steps will get my 1990's wiper back in shape. Currently fast speed is slower than slow speed (it almost stops!), and it's worst at the point where it extends up to the corners. I lubricated everything else but not the bit that extends it to the corners. Fingers crossed!

__________________
190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg

I know this is an old thread but this may help anyone working on the older type monowiper system;How to grease 300E wiper gearbox.

Sorry to resurrect this old thread, but I just bought a 1994 E320T with about 138k on the clock and I'm methodically trying to address all of the problems that it has, and a slow wiper is one of them. I started to follow this procedure, but I didn't see any three-sided rectangular cover at the lower end of the arm. All there was was the big plastic cover over the whole transmission assembly, and when I snapped off the cover all the innards of the transmission were all exposed and nekkid for the world to see. This doesn't look right - am I missing some kind of cover plate? I'm attaching photos so y'all can see - but don't be ashamed...

I slathered grease all over everything I could reach but the wiper didn't seem to go much faster; I'm hoping it'll free itself up with use.

Attached Thumbnails

   

__________________
Robert Fini

'12 ML350 BlueTec, 100k
'06 E320CDI (x2)
'05 T1N Sprinter 2500/Pleasure-Way Plateau TS, 70k
'97 C36AMG, 319k (son's)
'94 E320T, 249k
'93 190E Sportline LE, 168k (daughter's)
'84 190E-2.3/5spd (Stage Rally Racer)
'66 230 W110 Sedan (Barn Find, Vintage Racer build in progress)