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#1
02-05-2006, 12:31 AM
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Transmission 722.418 Governor Test Question
I have a '90 300D with a transmission problem that I'm hoping somebody can shed some light on. I've followed past threads and did not find similar problems.
Symptoms are that reverse works and 1st and 2nd gear forward work. That's it. I don't know the history of the tranny but it has good fluid (although I did find a small piece of broken grey plastic in the pan). I opened and found piston B2 to be just fine. I believe I have a problem with the governor. 1) How I can test governor? 2) Is it possible to remove the governor without removing the tranny from the car? Thanks in advance for your help,
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Roman _____________ 87 300SDL 152K 86 420SEL 228K 83 280SL 145K (5 spd) _____________ 
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#2
02-05-2006, 10:21 AM
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I had a problem with my 91 300d where it wouldn't shift out of first gear. It was a broken gear on the governor. If you remove the rear trans mount, push the trans as far as possible to the passenger side (i used a motorcycle tie down strap to hold it over), remove the big ring that holds the governor cover on and remove the cover (this is on the left rear of the trans case) you can see the governor. To remove it you must squeeze together or seperate the ears (I can't remember which) on a snap ring behind the governor weights then pull it out. Then make sure the gear is good with no broken teeth. In the shaft there is a valve that must move freely. Wash it very good with clean brake cleaner or something like that. It must be clean. The hard part of the job is replaceing the governor. If the gear is broken or damaged in any way, just go ahead and order it from MB. I looked for 2 days trying to find one at transmissions shops, parts houses, etc. I finally ordered one from MB, had it the next day, and it came out to the grand total of $1.90 plus tax.
By the way, my gear was broken in half. 1 half was on the shaft and the other half has yet to be found. I guess it is in some hiding spot. It's been over a year so I guess it likes it where ever it is.
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84 500 SEL (307,xxx miles)
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#3
02-05-2006, 06:10 PM
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Governor Help!
I took the governor cover off and I can turn it by hand about 50 degrees which I read indicates that the gear is broken, but I am unable to remove it. I see that there is a cover on the other end of the governor, but I dont know whether i need to take off the cover for me to be able to remove the governor.
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Roman _____________ 87 300SDL 152K 86 420SEL 228K 83 280SL 145K (5 spd) _____________
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#4
02-05-2006, 06:43 PM
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On the 722.4 the governor is held in place with a snap ring, you will need a long snap ring
Pliers to reach the ring. Look in front of the governor weights, that is were you will find the ring. Once removed you can replace the plastic driven gear on it, but the cause is a broken rear pump Check valve in the auxiliary valve body.
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#5
02-05-2006, 10:53 PM
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Thanks C32AMG for the information. Can you direct me where the rear pump (is this the secondary pump?) is located. Also where is the check valve in the auxiliary valve body?
Thanks
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Roman _____________ 87 300SDL 152K 86 420SEL 228K 83 280SL 145K (5 spd) _____________ Last edited by romansek; 02-05-2006 at 11:48 PM.
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#6
02-05-2006, 11:13 PM
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Is that manual I sent you working out?
The diagram shows how to remove the governer...hope it helps out 
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#7
04-01-2008, 10:36 AM
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1987 2.5turbo tranny problem
i am having problem on the tranny on my 190d 2.5turbo 1987 when i put on D mode it only takes first ad second at around 40mph goes off no shift but when i slide on 3 or 2 mode works fine on 3 mode i can get as much as 60mph at high rpm is that something that can be fix or need overall tranny i will thanks for any hel
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