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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Draining JD 550 Dozer transmission fluid

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macpeppers

01-09-2021 06:58:28




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1985 550c dozer. is the drain plug under transmission in the center




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Jim.ME

01-09-2021 17:52:14




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 Re: Draining JD 550 Dozer transmission fluid in reply to macpeppers, 01-09-2021 06:58:28  
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550 serial numbers 238320 - 261195 are 1976 machines. Your machine's serial number falls in that group, so yours is a 1976 straight 550 with a 6405 blade. That T at the ends tells it was built at the Dubuque Tractor Works.

Check your manual, there should be a suction screen in the opposite side of the case from the drain that you should check/clean while you have it drained. Also check about the steering clutch oil. As I mentioned before, I think it is shared with the transmission and the steering clutch housings will need to be drained and refilled as well. If they are shared, they hold way more oil than the converter.

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macpeppers

01-10-2021 08:34:39




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 Re: Draining JD 550 Dozer transmission fluid in reply to Jim.ME, 01-09-2021 17:52:14  
thanks again Jim, good information, i bought the dozer used and he told me it was 1985, oh well. i downloaded an owners manual and it look to have all the info i need, i found the screen you mentioned, apparently you drain the transmission by removing the screen and i found plugs for the steering clutches. this manual is much better for maintenance, the shop manual i guess is more for repair. i still dont know what that plug under the transmission is for. you've been a big help.

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Jim.ME

01-09-2021 14:38:06




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 Re: Draining JD 550 Dozer transmission fluid in reply to macpeppers, 01-09-2021 06:58:28  
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Interesting in that John Deere doesn't show a 550C on their previous models page or in a parts catalog, It looks like they jumped from the B series to the G series. What is your complete serial number? You may have a 550 C where the C means a 550 with a 6405 (6 way inside mount hydraulic) blade.

On the Powershift transmission (3 forward,3 reverse) I believe the drain plug is in the lower left side, front corner of the Powershift housing. I think the transmission shares oil with the steering clutches so if you are doing an oil change/service those compartments should be drained as well and new oil installed. Again I am not 100% sure on the info I gave you but think it is right. The right operator's manual for the machine would be a big help to you. And be sure to use Hy-Gard or an oil meeting John Deere's J20C spec.

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macpeppers

01-09-2021 16:49:23




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 Re: Draining JD 550 Dozer transmission fluid in reply to Jim.ME, 01-09-2021 14:38:06  
thanks Jim, i think you're right, the decal says 550 but the serial # tag says 550-C and it is a 6-way dozer blade. the serial # is 252281T. i've got the 700+ page shop manual and it shows a plug where you said. it doesn't show a plug in the center bottom of the housing but i can't figure what it would be but a drain. my trans oil is milkey so i would like to get as much of the old oil out as possiable. i'm guessing a lot will stay in the torque converter.

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macpeppers

01-09-2021 07:04:46




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 Re: Draining JD 550 Dozer transmission fluid in reply to macpeppers, 01-09-2021 06:58:28  
i'm having trouble posting a pic. what i think is the plug has a 1 1/4" round head with no shoulders or recess for a allen wrench. if it is the plug, how do i get it out?



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macpeppers

01-09-2021 09:35:19




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 Re: Draining JD 550 Dozer transmission fluid in reply to macpeppers, 01-09-2021 07:04:46  



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