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I was reading the old thread "HydraMatic Heaven" and a lot of the information about shifting is true, but the information about oil is not. The reason people seem to find the transmission works better with a heavier viscosity fluid is that the "Military" HydraMatic from the factory leaked...

OK I already spilled the beans on tonight's topic. The "dreaded lockup" in high gear. The apply port for this piston is extremely small. The only reason I could imagine they did this was to prevent a hard apply of the piston. What they really did was limit the time the fluid had to apply the...

I can tell you right now what happens when this "dreaded lockup" occurs. That large 12" diameter piston is hanging up due to a slow drain down on release. I was going to show people how to fix this tonight in fact.

Thanks Dave for all your help in this project. For those who don't know, plowBoy Dave is supplying the gaskets and seals I will need to complete this rebuild.

It would be like finding a very small needle in the proverbial Haystack. The plunger was factory honed to the bore of the Hydraulic Head. I suppose if you found a plunger that was slightly wider than your old one you could hone out the bore, but you would need some extremely precise machining...

No plunger ? They need to fit the plunger to the Hydraulic Head. So they must sell the plunger with the head.

Hey Dave. In those rebuild kits for the HydraMatics, are they just gaskets and a few rubber seals ? Need to know. How is the search for bushings and thrustwashers and seal rings going ? Thanks. Rustystud.

There is a way to adjust the fuel density plate manually. It has been done by a guy here. As far as going to electronics to control anything that would be extremely difficult to say the least ! One. There is no physical room in the Deuce injection pump for electronics. Second, it is all...

Some people have wondered about the operation of the reduction unit. So I'll try and explain it here. This transmission (The HydraMatic) was basically the "first" truly automatic transmission made. That being said they didn't know how most mechanical and hydraulic issues should be delt with...

There are differences between civilian and military units. The front pump is "not" one of them though. All HydraMatics came with the 7 vane front pump. That being said there is a surprise I'm going to post here later. The rear pump is the same also except for the line going to the reduction...

You might be able to salvage this Hyd Head. After dealing with whatever is scratching the shaft you can take some "jewelers rouge" and polish the shaft back to a usable one again. You might need to use a really small ultra fine file at first to knock down the high ridges on the shaft. Once the...

I'm gonna show you why you should clean all your parts as best you can. This crack was not visible until I sandblasted the housing. You can plainly see it has gone clear through the housing and it's at one of the four ears which holds the bellhousing on. This housing is "junk" . Next up is the...

So here's the steel plates. The first one is brand new NOS steels. The second one is slightly used and I buffed them out. The next two are really used but they could be reused if you were desperate. Which in this time means they will get used as parts are almost gone now. The last steel is...

Who takes apart a brand new part to inspect it ? You did nothing wrong. Anyone of us would have done the same thing.

I'm glad you decided to take it apart. You never know what is in there unless you look.

Thanks ! Here's some pictures of the mess right now.

There is one part I don't tear down unless it is broken. That is the reduction units "accumulator assembly" . It's basically a large shock absorber and you can see if one or both of the springs are broken without tearing it down. Trust me on this, those springs are strong ! and can easily hurt...

Thanks Dave !

You don't know how many times I have mentally kicked myself for not buying (at dirt cheap prices too ) these old trucks and parts. I had so many opportunities too. This one old fart (which I'm now a card carrying member) had two hundred M135's and so many transmissions and engines in cargo...

I'm going to show you a few "tricks" I was taught when I was an apprentice working on these transmissions. The 2 pistons in the reduction unit move on 4 "rods" which lock them to the housing. When your installing them with new seals it can be really frustrating trying to align them up with...