1450 Hydrostat

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dhermesc

Well-known member
I just bought a 1450. I'm looking at changing the oil in the Hydro unit as the previous owner assured me that it still has the original fluid from the factory - but he had changed the filter "once in the while".

The owners manual says nothing about changing the fluid but I figured with 26 years its probably time. I've been told the best way to to do this is to pull the rear cover, drain, replace the filter then replace the cover with a new seal and 7 quarts of Hytran. Anyone know of any issues doing it this way?

Is there a safe additive (stop leak) to add with the Hytran? I'm hoping to prevent the fresh oil from springing any fresh leaks.


This unit came with a Number 2 Tiller but I almost didn't get the rear angle pulley (PO couldn't find it at first). How much trrouble would I have been in if it wasn't located?

Anyone know where to find a new grill (lower) or what makes a decent replacement?
 
Congrats on the 1450. They are really nice machines. you might want to just check by removing the center, lower bolt in the rear cover. Some of those differentials were drilled through in that lower bolt hole, so you could drain the hytran. If not, you have one less bolt to take out to remove the cover.

Yes, if that hole is not drilled through, removing the cover is the easiest way. Once everything is drained, clean the surfaces really good with some brake cleaner or mineral spirits, to remove all of the oil. I like to put mine back together with the black/purple HyTack permatex that you brush on. This will keep the rear seal from leaking. There are no additives to put in the hytran. And, yes, you should only put Hytran fluid back in the differential. NOTHING ELSE.

Clean everything up and put it back together, and you should not have any leak problems.
 
I had never heard of one of the bolt holes being drilled out to drain a hydro? if you didn't but something on the threads it might leak through the threads? I also have heard of guys using neoprene and making a gasket as the cork gaskets do fail.

You will probably find a lot of white goop in the rearend. That is Hytran collecting the water that gets in there through condensation.
 
Removing the rear cover is the only way to drain it, and be ready for a flood of old fluid and junk - when you pop the cover you will get all 7 quarts (or what ever) at once. The yellowish waxy junk in the bottom and on the case walls is water the Hy-tran has collected. You can wipe it out or use a solvent like kerosene on a rag, but do not put anything in it and run/drive the tractor like is done to clean out the transaxle on the bigger Cubs
 
I dropped tha plate last night, surprisingly enough the old fluid that came out looked very clean - especially for being over 26 years old. Just a little bit scum here and there but no water either. My neighbor took it home to put in his leaky 560. I was expecting it to be a bit brown like old transmission fluid from a car thats never had its transmission oil changed. Went through 4 razor blades getting the old seal scraped off.
 
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