BROKEN W124, W201, W202, W210 Monoblade Wiper Transmission Gears - Mercedes-Benz Forum

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post #1 of 5 (permalink) Old 04-05-2011, 04:00 PM Thread Starter
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BROKEN W124, W201, W202, W210 Monoblade Wiper Transmission Gears

After a brief search I thought I would post to the "General" forum. I am not sure if an administrator can link this to the appropriate sub-forums.

Like others, my monoblade got stuck in the middle and the motor started to smell. I pulled the whole thing apart including the motor and found that the motor was still good after a little cleaning but the "transmission" had broken gears along the housing. They come in two pieces held in place with three screws and a curved metal piece each. I would like to just replace the broken plastic gears, since everything else is just fine. Does anyone have a contact at Bosch or have another source for the gear strips?

If there is no source, how many would like to be able to buy these gear strips? The entire assembly is over $500 new and I'm not sure how much I would trust ten to twenty-five year old gear strips at the junkyard.

Bosch part # on mine is 124 820 43 42 but I'm told the "current" part number is 124 820 23 07 for the ENTIRE assembly.
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post #2 of 5 (permalink) Old 04-05-2011, 04:09 PM
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You probably are going to have a hard time, if it's even possible, finding just the gears new.
Your best bet is probably just to get the assembly from a junkyard.

1979 Pontiac Firebird 5.7- 86,142 miles
1981 Chevrolet Corvette 5.7
1984 Mercedes 190D 2.2 Auto - 140,628 miles
1987 Chevrolet Sprint 1.0 - 139,000 miles
1989 Oldsmobile Cutlass Calais S - 123,000 miles
1989 Chrysler New Yorker - 95,000 miles
1991 Dodge Stealth R/T - 101,000 miles
1999 Dodge Durango - 178,000 miles
2003 Dodge Dakota - 203,000 miles
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post #3 of 5 (permalink) Old 04-07-2011, 04:26 PM Thread Starter
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Monowiper Rebuild Service

How many would be interested in this service?

$150 seem fair to R&R and lube the plastic gear with a new one with a lifetime warranty?

Some of you suggested I just pick one up at the junkyard. They wanted $50 for the whole thing, but I would not take it until I took it apart and looked at the gear. They let me. I found the gear was brittle, cracking and on the way to failure, so I passed even though it was operating.

If you want to DIY it, you can find the gear at odometergears dot com

my gmail: appliedracingtech ...if you want my help
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post #4 of 5 (permalink) Old 04-07-2011, 04:32 PM
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Why spend that kind of money when I can get another one from the junkyard?

87 300D turbo + 5spd
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post #5 of 5 (permalink) Old 04-07-2011, 08:19 PM Thread Starter
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Good question. I tried to answer it in the post, but I will go into greater detail. The OE plastic gear gets brittle over time. You can tell by looking at your current unit. Just under the upper metal housing that attaches to the wiper is a rubber collar. Between the upper metal housing and that rubber collar you will find the top part of the plastic gear. Pick at it with your fingernail. If you can easily chip little bits of plastic away, the gear strip is probably about to fail. It is all one big plastic piece. If my car had been wrecked a month ago, you could have bought my old unit from the junkyard for $50. After a couple of uses it would have failed. Was that worth $50? Would they give you another one FOC? Perhaps. How long will it last?

There were over a dozen MBs at the junkyard. Five were monowiper cars and only one had the assembly left on the car. As I pointed out, that assembly was already cracking and on the way to failure.
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