Rear end ID

[LengerichKA88 1,883]

So, I’m not having any problems with it, but I want to know what exactly I’ve got BEFORE an issue arises, and so that I can research how to properly service it. 

 

Our mystery machine (no tags/badges) is a 3 spd, 8horse, early 70s  tractor. I took some pictures of the rear end hoping that some eagle eyed member will be able to identify it. If not, I’ll take direction on where to look/ snap a picture. I don’t want to assume anything because then I’ll end up being wrong, so figured I’d ask for help. Thanks in advance! 

[stevasaurus 22,706]

It is a 4 speed transmission.  #5080 was on the 1971 Work Horse 800 & the 1974 B-80  The #5084 was on the 1974/5 B-80 4 speeds.  The #5085 on the 1972 Commando 800 and the 1973 8 horse 4 speed.  I can tell you that there is basically no difference between the 3 transmissions.  You would have to look at the break down of parts to find the different parts numbers.  It could be axle length, maybe one has a dip stick...that kind of thing.

   The main difference between the 3 speed and the 4 speed transmissions...the brake shaft is on the mushroom gear in the 3 speeds and on the cluster gear shaft on the 4 speeds.

[ebinmaine 67,265]

2 hours ago, LengerichKA88 said:

research how to properly service it. 

Is there something particular you would like to do to it?

 

[LengerichKA88 1,883]

2 hours ago, ebinmaine said:

Is there something particular you would like to do to it?

 

No, not really. I would like to have the appropriate manuals and literature already saved should I need to reference them. There’s also no telling when it’s been serviced (flushed and filled) last, and unless that’s a “no no”, something I’d probably add to the “Things to get out of the honey-do list” list for the future. 

 

@stevasaurus, thanks for the info!

[ebinmaine 67,265]

Definitely not a No-No.

I don't know off the top of my head what the change interval is supposed to be on that fluid but if you don't know when it was last done, change it.

 

if you're only going to change the fluid and nothing else is wrong that you know of...

You should get:

About a gallon of diesel or kerosene.

A new shifter boot.

And two quarts of gear oil. 90 weight works fine.

 

There are a few good threads on redsquare about how to change the gear oil.

Remember to raise the front end of the tractor as much as you can safely do so.

There is a bump on the inside of the transmission which is the casting for the center bolt on the bottom. The fluid that is in the bottom on the front needs to get over that hump.

 

The drain plug is on the bottom in the back and is a hex head flush plug.

 

The first time you drain it let it sit overnight if you can. It'll be surprising how much more fluid comes out.

Easiest way to fill the transmission is to remove the shifter handle which is done with a dog point set screw that is in the front of the shifter.

 

Put the drain plug back in and put about 2 quarts of diesel fuel in the transmission down through the shifter hole.

Notice in the previous statement I reminded you to put the drain plug back in before you fill the transmission.

I should not have to elaborate much further about why I would say that twice.

 

I wouldn't say that every single one of us has forgotten that at one time or another... But it's got to be awful close to that.

 

So anyway... Now that your transmission has a couple of quarts of diesel fuel in it go drive around in all of the gears 4 a minute or two, each.

Do a couple circles in each direction to be sure that the differential gears are getting cleaned as well.

 

Drain. Repeat above procedure. Refill with gear oil.

I'm fairly sure the capacity on that is 1.5 quarts.

[stevasaurus 22,706]

Fill until the oil starts to run out the fill plug on the left side of the trans.  That is correct amount.    No guessing.