1975 John Deere 450c dozer

Adin Stewart

New User
I have a 1975 450c dozer. It has a leak at the PTO and at the brake lever seals going into the final drive boxes ( both sides). I've replaced the seals in all three place and the leaks have continued. At the same time the leaks are happening, the transmission oil level goes down. It's like the oil is getting sucked out of the transmission and into the finals and building up pressure. Why isn't it flowing back? Is there a clogged port somewhere? What do I look for? Need some help. Thank you.
 

Do you have the technical manual John Deere publication # TM1102 (-R2 {01MAY87}is the current printing according to the JD site) for the 450C? There was a production change and 450cs were changed to a common sump for the transmission and steering housings. Early 450Cs did not have the common sump for the transmission and steering housings. My understanding is that there is field conversion info in the TM1102 manual, in the Powertrain section 40, Page 15-5, which details the conversion (may not be in the manual if the manual is original to a crawler built before the conversion). It sounds like your crawler may not have been converted. I don't have the manual so can't describe the conversion steps; you need the right printing of the manual which has that info and use it to check your crawler out. Here is one source if you don't have a manual.

https://www.johndeeretechinfo.com/s...;p2=search&p2_v=TM1102&pattr=p0,p1,p2

As for oil transferring to the steering clutches; a couple causes that allow that to happen are if the steering clutch seals are leaking or the hoses to them inside the compartments are leaking. The common sump (and the field conversion) would allow such excess oil, from leaks, to return to the transmission from the steering clutch compartments.
 
Thank you. I have read that in my manual that if you remove the tube in the final drive compartment you would turn the transmission into the
sump. And you would need to seal of the pipe plugs that are used for inspecting oil level in the final drives because they will no longer be
needed. I think you. I didn't want to start taking the machine down that far with knowing more. Well then, the work begins.
 
(quoted from post at 10:33:09 01/26/20) Thank you. I have read that in my manual that if you remove the tube in the final drive compartment you would turn the transmission into the
sump. And you would need to seal of the pipe plugs that are used for inspecting oil level in the final drives because they will no longer be
needed. I think you. I didn't want to start taking the machine down that far with knowing more. Well then, the work begins.

There are a number of steps to the conversion from what I understand. It is good the info is in your manual to guide you through doing it. Even if you convert it to the common sump you may still have problems in the steering clutch area. At least check for leaking steering clutch hoses inside the compartments.
 
I would like to thank all of you for your help. Your advice adds a little confidence that I'm moving in the right directions.
 
I'm sort of in the same situation. I have to replace a brake on the right side. While I have it all torn down that far I will do both sides and replace the seals and check the clutch plates and steels.

I'm building an out building with concrete pad so I'm not out in the yard and the elements. Logistics and scheduling......
 

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