Thanx for all the detailed posts Bogy ~ I know very little about slushboxes and have been afraid of damaging things so I almost never dip into them .
I know there's a service port you can attach a pressure gauge to and make adjustments for wear, leaky O-Rings (the #1 TH350 killer) , I should have tried to link you to an article about this but I didn't realize you were going to yank it out so soon .
Agreed, the .393 tranny is prolly better, I imagine it's standard fitment to TD's like it was in 24DL Taxis.....
Beefier is always better, lasts longer etc.
Keep at it and let us know what you find please .
-Nate
Bogy wrote :
The governor looks good - not that that means anything. But there are no broken parts that I can see and everything moves smoothly and was remarkably clean. It is a 722.303 which I have learned is a 300SD transmission. But this is in a 300TD so it is probably appropriate given that they are both a little heavier than our blessed 300Ds. I found some ATSG PDFs that have some good info. I was hoping to find a theory paper or some other description of the operation of this thing so I can think my way through the troubleshooting. There is a 1-2 valve in one of the bores on the upper valve body. Since it presents as not shifting out of first, then a 1-2 shift failure seems a good place to look. But I really need to understand how the governor pressure relates to all of this, and by the way, does anyone know where this fabled pressure test port is and what does it actually connect to? This is why I want a theory paper. Anyway, thats the news from my driveway. Any thoughts, data, pointers to data, etc. are welcome.
Bogy.
From: "Bogy Wan Kenobi polespearbogy@... [diesel_mercedes]" <diesel_mercedes@yahoogroups.com>
To: "diesel_mercedes@yahoogroups.com" <diesel_mercedes@yahoogroups.com>
Sent: Wednesday, March 15, 2017 12:58 AM
Subject: [diesel_mercedes] Re: sudden tranny failure
The kickdown switch and solenoid are both intact and properly functional. Since it is not upshifting I am pursuing the possibility that the governor, which adjusts a pressure according to vehicle speed, is not operating properly. If that pressure does not change then the transmission will not shift. It may not shift for other reasons too. But this is the next one I can think of. I got the slushbox out today and will put it on a bench tomorrow and pull the governor cover off and have a look see. I still believe that the core mechanics are intact and the problem is with the controls - the valves and springs and whatnot. Tomorrow I will investigate some of that whatnot beginning with the governator.
Bogy
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