Onan HELP

Gotta ask before I go any further..... Flywheel on motor we took out of case was towards the front, shaft out the back. Motor out of Cub cadet had flywheel facing the back, had a long drive shaft going to rear. Front had pto pulley to mower deck belt. Took pto clutch and pulley off and that shaft lines up perfect with case hydraulic pump. I had planned to put that motor in with flywheel facing front,will it be running backwards?????

Or was drive shaft off the flywheel on Cub cadet made to operate backwards??

If I understand your question correctly;

Both engines should rotate in the same direction so if your old engine had flywheel facing forward the new engine should be installed with the flywheel facing forward.

I don't understand your question.
I wouldn't run a hyd pump backwards.
One can usually buy a stub shaft to attach to flywheel if needed.

Cubs Cadets run backwards. It's because when they adapted the International Cub/Farmall Cub transmission for the Cub Cadets they had to compensate switching from a International Cub engine that runs at around 1000 RPMs to a Kohler engine that runs at 3,600 RPMS. If you take the front off of a gear drive Cub Cadet you'll find the input shaft is actually a little gear that meshes with a much bigger gear but makes a 3:1 reduction so the 3600 RPM Kohler turns the input of the actual transmission (big gear on the input) at about 1000 RPMs, it also reverses the rotation of the input shaft of the transmission with respect to the engine crankshaft. SO if you're going to use a normal engine in a Cub Cadet you have to flip it around and run the drive shaft off the flywheel side of the engine. If you're going to use a Cub Cadet engine in about anything else you have to spin it around and hook up to the normal or PTO side of the engine. Conversely if you had an old REO lawnmower engine that you wanted to put in a riding tractor since they run backwards you'd have to put it in backwards, flywheel forward in a Cub Cadet, fly wheel aft in about anything else. The REO engines actually ran the output shaft off of the end of camshaft so they ran backwards compared everything else.

Those Case tractors had their engines installed the opposite of most other makes.

As a result, the blades in the mower deck (which you may not have) run the opposite way of most others and the deck has the discharge on the left hand side instead of the more common RH discharge.

As the others have said, you have to mount the engine as the old on was or obtain a hydraulic pump that runs the opposite way.

If you did that and don't have a mower deck for the PTO to drive you could mount the engine as you were originally planning.

Surplus Center has reasonably priced hydraulic pumps.

I don't know of any common engine that 'runs backward' when viewed from the same end. For instance, when viewed from the flywheel end,all Onans turn clockwise. The Cub Cadet has a gearset inside the transaxle that reverses that. So a Case and Cub Onan are the same.

Forgot to mention that the Cub crankshaft may not be exactly the same length as the Case. Be sure that the coupling hub on the engine side is fully engaged with the flywheel and there is a small space between the coupling halves. Too tight a fit there will destroy the spider quickly.

If it is too long, they are easy to cut to the correct length. The keyway may need to be lengthened if cut. Careful Dremel work can do that.

Grandpa, I can't really answer your question as I don't know for sure. But I do have a 646 case garden tractor and the engine had been changed to a 2 cylinder Kohler engine. It works fine. The only problem I did have was my Love-joy coupler came apart and tore up the part around the coupler and when I tried to get a new part from new owner of the Case Garden Tractors which is Ingersol, they couldn't and wouldn't help me. I worked and worked and finally got it straightened so the coupling ran perfectly true between both shafts, which is a must. End of problem with the coupling. Hope this helps.

You're thinking right, but your description could be misunderstood. To be clear, the engine in a Cub Cadet runs the normal direction, just the engine is turned around to correct the rotation for the transmission. The only thing on a Cub Cadet that turns backwards is the starter/generator.

You're close, but the reduction gears are WAY more than 3:1 reduction. I have the exact tooth count of each reduction gear in my parts book and Midwest SuperCub catalogs, plus MWSC makes several different over-drive ratio reduction gear sets up to +25% OD, But the reduction gears reduce 3600 engine RPM to 515 RPM with the rear transmission driven PTO which means the reduction gears are 7:1 reduction, 12 tooth driving 84 tooth, But You're talking KOHLER engines and Gramps is playing with ONAN'S. And I'm about 99% sure he's hooking up to a hydro rearend in the Case. Even a Cub Cadet hydro does not have reduction gears.

Mount the engine the same way as the old one was or every thing will work backwards.

Case is not hydrostatic drive, it's hydraulic drive. So it uses a standard hydraulic pump, valve, and motor to drive the two speed gear box.