Archive through February 28, 2011

[aschmidt]

When i did my V6 tractor, i installed the motor water pump to the front which is spinning opposite of the stock motors. All i did was rotate the hydro pump 180 degrees and flip the ring gear carrier 180 degrees. The levers and speed selector all remain the same. That is it. I have ran the thing up to 5000 rpm quite a few times to see what would happen and so far so good. I am sure that it is not "good" for it - but gotta find out some how - right? By the way, the swash plate in a hydro does not go as fast in reverse as it does in forward. Hope this helps a little.

 

[mhomrighausen]

Aaron is correct with not going as fast in reverse. I can't remember offhand about that if it is just the linkage (I think that is the limiting factor). Aaron is now experiencing a slightly noisier hydro by using the CCW versus the CW rotation valve plate. So, if you don't mind a little extra "whine" with the cheese then go for it. Aaron, Dennis F. and others are correct about rotating the carrier. And yes..... you can run a pump up to beyond the recommendations....AT YOUR OWN RISK though. I would never recommend it. One really does cause premature wear and tear on the pump by doing so.

Summing up.... if you really want to run a 15U up and beyond recommendations then it would probably be best to do so with a NON ported versus a PORTED since everyone seems to want to be "stylin" and convert a non ported to a ported and there are more non ported tha ported floating around out there. ( You know.... blow up something nobody seems to want....)

Have a great day....

 

[mgonitzke]

Marlin-

Isn't the speed difference because the pump swash plate tilts 7 degrees in the reverse direction and 15 in the forward direction?

 

[mhomrighausen]

Matt G. You're correct about the swashplate travel only I don't know as to what the degree difference is. If I were to mess with something like that I'd re-configure the linkage to get the higher former reverse which would be the new forward. Or in other words... just reverse the linkage.

A few years ago I stopped by a gentleman with four or so Cub Cadets. One had a loader and one was "parked" as a spare and the other I remember was a parts gear drive. I can't remember what the fourth one was designated for. I remember so clearly how the fella had cut the fenders and other necessary metal away on the parked "spare 127" so that he no longer needed the hydro linkage since it didn't work anyway. He didn't want to fix this poor little 127 so he welded a short rod directly to the trunion area just above the springs after he removed the springs. That way he could control forward/reverse much faster than with the linkage. It didn't take me long to figure out why the tractor (to this day still) sets in the same spot. His direct drive would cause wheelies unlimited with the slightest touch and he didn't have any way to hold the tractor in neutral. Yet.... he won't sell it..... And if I were to have that poor little 127 I would definitely have to fix that hydro. Otherwise after being around the bigger ones all day, I really don't like messing with any hydros unless necessary.

 

[aschmidt]

Thanks Marlin and Matt. If i remember inside of the pump it is something about the limits of the swash plate internal and not on the linkage. Dont quote me on it. I do get a little more wine, but it isnt bad at all. I only say that i have reved mine up cause im expecting it to break and am kinda curious on how long it can go and how many times. if it goes i will definitely have pics and info about it! You guys will be the first to know. I think that driveshaft balance will have a lot to play into this also. Spinning a 5/8" rod at 4000-5000 rpm is also very dangerous. I am thinking of building a heavier tunnel cover out of say - oh .25" steel and putting (3) 5/16" bolts thru it into the frame. A bottom loop would not be a bad idea either. Not interested in walking into the hospital with a drive shaft hanging out my leg or other areas. I had a drive shaft go on my 782 loader and you cant shut them down fast enough before the major damage is done. Remember everyone - SAFETY FIRST when changing, modifying, or altering stock items. Other than that - modify on!!!

 

[sarcher]

so it sounds like I'm gonna have to flip the carrier...
Oh well, another saturday project.

 

[mhomrighausen]

Over revving a 15U has potential to launch a valve plate.... thus effectively destroying the entire pump.

And that can happen easier than one may think.

 

[daweber]

Steve~
When flipping the carrier remember to swap the bearing cups to the other sides also and if you find that when you try to flip the carrier around it won't go it. There isn't a lot of room to work with and you may have to cut the rivets out of the ring gear to take it off and then get it all back in the housing and then bolt it together in the housing. I had to do that with one of the hydro's on my articulated tractor.

 

[sarcher]

got my driveshaft put together. I'm not really liking the angle... approximately 25 degrees.
What do you guys think? In order to get the engine any lower I would have to severely notch
the frame... which I would rather not.

 

[mgonitzke]

That might be too much. Most U-joints aren't rated for that much angular offset, I think.