Archive through February 28, 2011

[sarcher]

My pics didn't show on my first attempt, although they did on the preview...trying again.

I finally got back on my 4a084 125 project after about 2 years off.
Apparrently I just missed the "Redneck Nationals" at my local dragstrip that included mower drag
racing. They are doing it again in Nov so now I'm motivated to get this thing finished.
This weekend I got the fenders and footrests mounted. I'm still working on a driveshaft and
where to put two batteries (or switch to a 12v starter)

 

[kpeaney]

Steve, archive bug did it again. Please repost pics. Got me earlier.

KennyP

 

[tkrispense]

I like it! I have a similar cub and am wanting to increase ground speed. Will increasing input shaft speed to the hydro also increase wheel speed ? If so would it be at the same ratio?

THANKS

tkrispense

 

[sarcher]

Todd, I believe it will but I'm not sure what the upper limit for hydro input speed is. I am using much larger rear tires which will increase my speed but I probably won't spin my engine above 3600 rpm anyway. I would like to change my gearing, but I don't think there are any alternatives available.

 

[dfrisk]

Maximum recommended RPM for the stock cast iron flywheel on a Kohler engine is 4000 rpm, as is the max recommended RPM for the Sundstrand hydro. There's really not much gearing in a hydro rearend and nobody that I'm aware of makes any alternate gearing.

 

[kmcconaughey]

About the only way I can think of to speed up a Cub Cadet hydro would be to add a chain drive setup from the axles to new hubs spaced farther to the rear. This is what I plan to do when/if I ever get around to building my Cub Cadet based utility vehicle. I also intend to add a rear suspension via a swing arm setup. I don't want to loose too much pulling/hauling capability so I don't plan on altering the "gearing" too much. Here's my mock up sketch.

 

[sarcher]

I had a similar idea for another dragster type cub, but with the wheels mounted above the axles so I could run much bigger tires(like 31" slicks) without having the whole tractor 2 feet off the ground.

 

[kmcconaughey]

Steve, certainly for a dragster you'd want a lower center of gravity. For a utility vehicle I want ground clearance.

Here's a few photos of a Cub based vehicle that was built by Kelly Birky (I think it was Kelly, or was it Warren Newton?

Tyler if you're watching please correct me.

) Tyler Turner owned it briefly and is who the photos are from. It used a belt drive setup to speed it up.

 

[sarcher]

that is pretty slick. I wonder if the belts slip when they get wet. Anyway, same idea, just chain drive...

 

[sarcher]

does anyone know what happens if you spin a hydro over 4000 rpm????
just curious

 

[kmcconaughey]

Lets see, according to the technical manual, no harm unless you exceed 4200 RPM. Then I would guess all bets are off and it could go:

 

[thoffman]

Steve,
Hmmm

 

[kmcconaughey]

Tom,

 

[kmcconaughey]

According to this 4000 RPM should be just fine.

 

[sarcher]

I'm planning on building a foot control setup for my hydro with the 4a084. I have flipped the
charge pump to accomodate the reverse rotation. The question is do I need to flip the
carrier or can I just make my controls so the lever works in the opposite direction? Is a
hydro equally fast in both directions? If I effectively use reverse for forward on my hydro
do I get full speed? Do I really have to flip my carrier? So many questions...

 

[dfrisk]

STEVE - As installed in CC's, Hydro's were limited to 8 mph forward and 4 mph reverse.

Not familiar with how the 15U responds to reverse rotation. Maybe MARLIN can comment about having to flip the diff gear.

 

[daweber]

Steve~
I am 90% certain you will need to flip the ring gear as well. I researched this topic a bit quite a while ago during that phase of the on going build of my articlated tractor, and can't remember exactly, but that seems to sound right. At that time I was going to use a 4a032 engine. If I recall correctly on mine it was either flip the charge pump "guts" around or flip the whole unit around and drive it from the backside. Either way involved flipping the ring gear. One ring gear flipped nicely, the other no so nicely. Hopefully somebody that can remember better than I will chime in!

 

[sarcher]

wasn't there a pictorial how-to on flipping the charge pump on here? Or did I see that somewhere else???

 

[digger]

Steve A.
I'm working on getting it put together. Norm B. sent me all the info. Now all I have to do is get off my dead butt and get it finished.
I'll try and get it done ASAP.
I have to load it all up, send it to all the guys that helped put it together so they can check all the info one more time before I post a link for everyone.
I'll send it out them tomorrow some time and I'm sure they will get it back to me pretty quick.

 

[mhomrighausen]

Oh, man.... It's too early for all this reverse rotation stuffies.... Let me read everything over tonight when I get home. Quickie here though....... Do you really want to purchase a DIFFERENT a.k.a. Clockwise rotation VALVE PLATE for the pump? They aren't cheap you know.

And maybe I won't do pictures however I'll explain one more time a little about reversing a 15U Series and then I am going to archive it in my folders so that I can copy and paste since it seems to keep popping up.