1811 hytran change

Darrell · #1 08-17-2010, 09:40 PM

Hey Guys , I need to change the Hytran in my 1811 and was reading about it being a pain to do since you have to bleed off the excess air. I read about putting a small hose thru the funnel into the rear , and loosening the release valve , which both seems like good ideas.

But i was wondering , can you just leave the filter off the rear and add fluid until it starts coming out of the filter mount ??? The air would be forced thru the mount that way.

What i am not sure about doing it this way is if the fluid level is the same height as the filter mount , so it would not get overfilled.

You would also have to keep track of how much Hytran you put in and keep an eye on your filter mount so as not to lose that expensive fluid.

Anyone ever tried this ??

Matt G. · #2 08-17-2010, 10:24 PM

That won't work because the filter is considerably lower than the full fluid level. You'll have to either loosen a relief valve or put a hose through the fill tube. It's too bad they didn't think of a separate breather for the trans until later on in the Cyclops series.

Darrell · #3 08-17-2010, 10:28 PM

Thanks Matt , I should have figured something wouldn't work out , that would be to easy.

squatch · #4 08-17-2010, 11:00 PM

I just refilled mine on my 1872. I just removed both relief valves. I have a funnel that fits perfectly in the fill tube. With the valves out it's no big deal. with them in it's a real pain and the fluid burps will make you crazy. Biggest problem with mine is draining. The plug was reinstalled by an extremely large gorilla at some time before I bought it and it's not coming out without taking part of the case with it. So I slowly remove the rear diff cover plate to drain mine. Good time to inspect the innards.

chmaso · #5 09-10-2010, 11:32 AM

I'm new here and not trying to hijack this thread at all so I ask for forgiveness in advance.

I am getting ready to change out the hytran in my 1810. I have copies of the 82/72 chassis service manuals and only have the information in there to go on.

I am trying to find a safe way to remove the rear cover on the differential on the tractor without damaging it. I do have a new IH gasket, 2 gallons of hy-tran and a new IH filter to put on the tractor. I only want to remove the cover plate to "clean out an gunk" that may be in the rear end.

Squatch references a "drain plug". If I can just drain the fluid out of the rear and refill that may be my preference for now.

Advice, tips, moral support etc is greatly apprecated.

Thank you in advance!

Chris Mason

Suffolk, VA

Matt G. · #6 09-10-2010, 02:40 PM

If you look underneath by the suction line, you'll see the drain plug. Drain it first and then take off the rear cover by gently prying it off with a screwdriver. Clean the mating surfaces on the rear and cover before reinstalling.

chmaso · #7 09-10-2010, 04:09 PM

Hi Matt,

Once I stopped worrying about tearing up my 23 year old tractor and just started poking around I found it without issue.

Got the old stuff drained, then I removed the old filter and replaced it. I then removed the rear cover and cleaned up the inside of the differential. Really the hardest part of the whole job was getting all of the old gasket cleaned off.

Reinstalled the rear cover, removed the check valve on the pump and used my Amsoil hand pump to fill with 7 quarts of new Hytran.

Ran the beast around the back yard and it purrs like a kitten.

Now if I could only get that darned oil drain plug loose I'd be good to go...