wheel cylinder replacement Michigan 55a

Hello, I have removed the wheel and tire and the end cap exposing the 3 gears, axle plus the gear on the end of it, and the outer gear(for lack of a better name) all inside the hub.The outer gear is bolted and safety wired. The axle appears to be able to pull out, but I have not done that yet. I need to get to the wheel cylinder because it is leaking. Can someone walk me through this? I don't want to experiment and cause myself any unnecessary grief and I would like to learn the correct procedure the 1st time.

Today I bled the brakes and felt some pedal but it lost pressure and fluid and I had a big leak coming from this one drum. I may need to address the other wheel cylinders too since they are all probably the same age.

Thanks

My uncle ran those type machines. I don't know if any had brakes. I remember him saying what a pain they were to get to. Those things have one heck of a good shuttle shift unit in them as he would keep going from fwd to rev to hold them in position for dumping. He is gone now so we can't ask how to do them. Wonder if there is a service manual out there on them ?

It's a machine built in the 60's so there may not be too many people who remember working on them. My property is not level so I need the brakes. The odd thing is there is so much gear oil in the hub that the design is a bit of a mystery on how that is kept out of the brakes. I have worked on some old trucks where they have seals in nuts that are obsolete and keeping oil where it belongs and off the brakes can be a problem. I would be very very happy to be able to get my hands on a service manual!!! If someone could make me a copy of theirs, that would be awesome! As is I may have to just start dismantling and hope for the best. I hope someone with the knowledge see's this post soon.
Thanks

I see the next step and it must involve removing the axle, then the nuts that hold the wheel bearings. I have done this before on trucks where they go back in easy and I have had them be a nightmare to get back in. Possibly that hub gear comes out with the hub and drum. If it will just stop raining I'll get on it.

Thanks

What fluid does that machine use in the brake system? There were some machines that used mineral oil instead of brake fluid; if someone put brake fluid in the system it would eat up the seals in the wheel cylinders real fast. Do you have the manual to check what the right fluid is? I don't remember which machines mineral oil though (it was a long time ago).

Our axle supplier mistakenly shipped us some axles that were made to use mineral oil; our plant installed brake fluid and by the time the machines got to CA, the wheel cylinders were leaking. The axle manufacturer sent parts and techs to CA to correct the problem.

The machine had almost no fluid in the brake system. I assumed it was Dot 3. I have an operators manual. It is 54 pages, it covers bleeding brakes and fluid level checks and lists viscosities, what oil to use, but no mention of what to put in the brake system. Only that they are hydraulic. I don't think the brakes were operational for a long time. There are no leak marks on the tires from a machine that was sitting and this machine was sitting for years. The Gov agency could not remember when it was last moved or ran. They said it was many years since it moved because it was parked in the same place as long as anyone could remember. I put a vacuum on the bleeders and only removed a very small amount of what looked like orange colored brake fluid from the wheel cylinders. I didn't check the fluid, as I said I assumed it was regular brake fluid, what was in there looked old and dirty.
The brake system incorporates a disconnect in the transmission when the brakes are applied. This part of the system has been disconnected and plugged so the system only actuates the wheel cylinders on the 4 wheels.
It would seem that any fluid out of the ordinary, normal dot3, would have been listed or even highlighted in the manual. I hope somebody can give a definite answer.

Thanks