303M HydraMatic rebuild

[rustystud]

Using the special clamp tool again I compress the seal rings and install the rear drum assembly.


Now after installing the front and rear bands the drum assemblies are ready to go into the case. You need to "stab" the front shaft first angling the assembly into the case. The TM shows this. I don't have a helper to take pictures so I cannot show you how I do this .

Once the assembly is in place and the main support is bolted down, you can pressure test the whole assembly.
This hole applies the front clutch.
This hole applies the rear clutch.

After tearing down everything due to the high leakage, I checked the iron seals for clearance. Since I only have four seal rings at this time, I never checked this as it is a moot point. You need a .002" and .007" feeler gauge to check this gap. The gap must be over .002" and under .007" .
Everything checked out as I figured it would. Since most likely the military rebuilt it last.


Now everything is almost back to where I started this morning !

 

[rustystud]

This Monday I'll be taking all the pistons I have down to the machine shop to be modified to except rubber seals. Hopefully this will not take too long.
In the meantime I have seven HydraMatics to tear down. Lets see what parts I can salvage from them.