Combines M2 Hydro Transmission

[T__langan]

We had a similar thing happen once to an M3 we had. Pulled into a field off the road, shifted to a lower gear, and she just wouldn't go anymore. Come to find out that the coupler that connects the drive axle to the final drive was cracked on one side and the shaft was spinning inside the coupler. When we seen that, we started breathing again since it wasn't the hydro gone bad! I hope your problem is as simple as ours was........ Something to investigate.

 

[Curt]

I wish it was nothing more than a coupler but we got under and looked and there is no movement at all. Do you think that if the transmission is low on oil it would do thisIJ Does anybody know how much it might cost to get it fixed if it is badIJ Comments and advice appreciated. Curt

 

[Tom_Russell]

You have 2 separate transmissions. The hydro unit is the one that gets power from the engine via the long belt. It gets oil from the central hydraulic tank on the RH side of the separator below the engine. The hydro is bolted to the gearbox, which has its own oil supply. low hydraulic oil level would show up in other functions like no steering or header raise. low gearbox oil would not be noticeable except your monitor light would stay on. Your monitor system should be telling you if you have oil problems. Hopefully you have the optional monitors that do this. I would not operate an expensive piece of equipment like a combine without a complete set of monitors but many others will disagree. From your earlier description, it sounds like you have a typical case of dead hydro. There are specialized shops that rebuild them but as of now I have no experience with them. Tom in MN

 

[Curt]

I completely agree with you about running an expensive piece of equipment without proper gauges. They work too, I just wanted to see if it would tip someone off to what the real problem might be. I also noticed that the machine is now sitting in my yard at home so I'm wondering again what it could beIJ The light never came on saying that the hydralic oil has overheated and the gauge says it's full on the tank, nor did any of the hoses feel hot. I think you hit the nail on the head, I think the hydro is going out. The pump is brand new and the header and the auger and all that work great and when the machine does move it takes right off. I don't know anything about hydro it's new to me but I do know that I'm going to have a like new machine all the way around by the time I get done fixing things.

 

[Itchy]

I have run into a simmilar problem a couple of times on a N-7 which I think may be the same. On the end of the hydro where the big pulley with the belt on is. In the center of yhat pulley is a plate three or four bolts hold it on, pull it off and see if the splines that slide over the hydro shaft are still there.

 

[Dan]

What year machineIJ Did you change the hydralic filterIJ Did you check the coupling inbetween the hydro and transmissionIJ May be the orfice in line to the little cylinder on side of hydro. Maybe the piston seal in the little cylinder. Maybe pin come out that hooks little cylinder ram to swash plate in hydro. Maybe fork come loose from bushing in servo that little cylinder is hooked to. Drain some oil and look for filings. Should take a pressure check to see where you are at. Good luck.

 

[Curt]

We did replace the oil filter put all new oil in it. I was wondering though you have obviously been inside of one of those pumps before. Do you have any shcematics of the pumpIJ If you do could you scan them or mail them to meIJ Also if you do I will give you the serial number and the make of the pump. Thanks for the advice