Broken Tractor, Clutch problem in HST

racerboy832 · Jan 23, 2011

Bought a tractor. Deutz Allis 5520 HST 4wd with FEL and Backhoe. Same tractor as the Massey 1020. It seemed to drive ok. Changed all the fluids and it wouldn't move right. Dad played with it and seemed air bound. Started working ok. I moved it to a friends and didn't seem right. The PTO would stop with any pressure on the backhoe. Same as before when it seemed airbound. Brought it back to dads, New filters ( $215). Barely moved. Next day dad let it warm up for about 30 minutes. Worked the Front loader a bit and he said it seemed good again. We assumed it was air. Today went to move some snow and it's not right again.

I was able to catch a piece of the shaft that runs from the clutch to the HST pump. It's barely moving even at 1500rpm. We adjust the clutch so there is a ton of freeplay. Helped a tiny bit. The hotter the machine gets the better the shaft seems to spin. It's almost like the clutch needs to be real hot to actually grab. Any low rpms will stop the PTO shaft.

I'm not worried about splitting the tractor but has anyone seen this happen before. Why did it seem to manifest after the fluids were changed? We assumed it was a air problem but if the clutch isn't locked properly I guess it couldn't make enough drive pressure.

racerboy832 · Jan 23, 2011

The tractor has 680 Hours on it.

Scotty370 · Jan 23, 2011

I'm thinking that MF Dealers, like JLS are going to at least point you in the right direction. Sorry I can't, but stay tuned! ~S

Kernopelli · Jan 24, 2011

Can't help you with specifics either but if the DA 5520 is basically a MF 1020 you can go to AGCO's website and look up the 1020 and get parts breakdowns which may help answer some questions. You can look at detailed clutch or trans diagrams and get parts numbers there. Hope it is of some help to you, enter the website as guest user and follow menu prompts AGCO Parts Books

racerboy832 · Jan 28, 2011

I guess i'm gunna have to split it in half. Not looking forward to it thou.

Ford tractor · Jan 30, 2011

So, it's working perfectly then you change fluids and now it's fubar?

Could be the clutch, but I would wonder about it being something easier (cheaper) to fix than a clutch! Did you clean the return screen? The one almost nobody cleans because it's a PITA to do and spills hydro fluid all over you. Could you have put the filters on the wrong sides? Have left some plastic shrink wrap on which is blocking flow? Just blue skying issues that could remotely be related.

racerboy832 · Jan 30, 2011

Dad took the tractor out yesterday. It was Moving sorta ok , then 1/2 hour later wasn't so good. He parked it for 1/2 hour grabbed his little JD and moved some snow. He then got back on my machine and he said it worked great for about 3 hours till he was done and parked it. If there is a Clutch problem, Why does it come and go? Dad, Brother and myself are all mechanics by trade. Between the 3 of us we can usually fix anything.

Scotty370 · Jan 30, 2011

Any 'icing', IE fridge temperatures, in the equation?

racerboy832 · Jan 30, 2011

Fluid is all new and tractor was in the garage.

Ford tractor · Jan 31, 2011

racerboy832 said:
Fluid is all new and tractor was in the garage.

Is there water in the fuel icing in the filter? Or is the fuel old summer fuel and waxing or gelling up and clogging?
I really don't like to use the stuff unless it's an emergency, but products like "rescue 911" that will melt ice and waxed fuel might help. Definitely run the tank down to about dry and put in fresh before you go nuts.