Manual Transmission question

Olnate · Feb 14, 2020

I have a Parson's 77-L rubber tire backhoe (1960's era). Might be the only one in existence (no pictures or literature on the internet). The transmission is a borg/warner T98-1R 4 speed manual transmission. I will need to take it out this spring and either do some major repairs or replace it. The backhoe has a shuttle shift that the transmission connects to, a driveshaft to a large rear pumpkin. Most T98 or T18/T19 are from half ton trucks, 1 ton trucks etc... My question is can I put a vehicle transmission in to replace this one or is there specially geared ones out there. Is the RPM reduction coming out the shuttle shift or is it accomplished in the tranny or rear pumpkin. Just want some more info before I work on this project.

Sure could use a service manual but impossible to find.

Thanks for your help
Nate

Jim.ME · Feb 14, 2020

(quoted from post at 15:49:31 02/14/20) I have a Parson's 77-L rubber tire backhoe (1960's era). Might be the only one in existence (no pictures or literature on the internet). The transmission is a borg/warner T98-1R 4 speed manual transmission. I will need to take it out this spring and either do some major repairs or replace it. The backhoe has a shuttle shift that the transmission connects to, a driveshaft to a large rear pumpkin. Most T98 or T18/T19 are from half ton trucks, 1 ton trucks etc... My question is can I put a vehicle transmission in to replace this one or is there specially geared ones out there. Is the RPM reduction coming out the shuttle shift or is it accomplished in the tranny or rear pumpkin. Just want some more info before I work on this project.

Sure could use a service manual but impossible to find.

Thanks for your help
Nate

My thoughts are the transmission is most likely the same a one from a truck. The reduction would be in the rear differential (and planetaries, if it has them). Once you have the transmission out you can turn it by hand to check the gear ratio of each gear.

Nordic · Feb 14, 2020

I've had a few backhoes (not your make though) with 4-speed and shuttle shift... they, however, only had 4 gears forward as the shuttle put it in reverse. I believe 4th was
direct or 1:1 ratio. Reverse, however, was 15% overdrive. You wouldn't think of taking your current tranny in to be repaired?

Olnate · Feb 15, 2020

Thanks for the replies. Looks like if need be should be easy to find. I plan on trying to fix this one, it might be too far gone though. Drain plug has a chip with a 3 inch crack, would need brazing. The index pin by the shifter is gone, broke the top part of the casing. Can't get it in 4th gear.

One more question, the drive shaft looks easy to take out, is it an easy process to remove from the shuttle. Is it as simple as removing the bolts an pulling the transmission backwards or is the linkage into the shuttle more complicated?

Appreciate your help on this.

shaun wallace · Feb 15, 2020

I may have extra T98. Cant gauretee it. Have to look.

Jim.ME · Feb 16, 2020

From your first post it sounded like the transmission was bolted directly to the rear of the shuttle with a drive shaft from the transmission output to rear end. If that is correct I would approach it as the splined input shaft of the transmission would be a slip fit into a coupling inside the shuttle. I would expect the drive shaft would be removed and if there are any transmission to frame mounts, they would be removed. Then the transmission mounting bolts holding the transmission to the shuttle would be removed and the transmission would slide back and out of the shuttle. I am thinking that interface is what you are calling linkage into the shuttle. Is that thought correct or is there something else there? You can always post a few photos if there is something else you are referring to.

Olnate · Feb 17, 2020

Jim,

Here is a couple of photo's of where the transmission attaches to the shuttle. The shuttle linkage was disconnected to un-screw the cap on the shifter.

Thanks
Nate

Jim.ME · Feb 17, 2020

You will need to clear the linkage from the side of the transmission but I don't see any reason to do anything with the linkage going into the shuttle. The transmission should only be held by 4 bolts, one of which I pointed the arrow at. The other 3 would be spaced around that same face flange of the transmission.

Olnate · Feb 19, 2020

(quoted from post at 15:28:28 02/17/20)
You will need to clear the linkage from the side of the transmission but I don't see any reason to do anything with the linkage going into the shuttle. The transmission should only be held by 4 bolts, one of which I pointed the arrow at. The other 3 would be spaced around that same face flange of the transmission.

Sorry Jim, linkage is the wrong word to use. I was worried if I pulled the splined shaft out of the Shuttle, would it be easy to insert a new one back in (fixed coupling) or would a bunch of discs or gears fall out. (no idea what's inside of the shuttle.

Sounds like from your response, it should fit pretty easy.

Thanks
nate

Jim.ME · Feb 19, 2020

I am only guessing, but it shouldn't let a lot of parts drop from having dealt with similar set ups. Can you find a tag on the shuttle? If you can you might find some info about it on line, maybe even a manual or some drawings.

Manual Transmission question

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