Please excuse my ignorance but why the LH discharge? Engine reversed from norm on the cases? Just trying to weight my options if I cant find a Case deck/mule drive,etc. in a reasonable amount of time from now.
If you are looking for an absolute reason, there really isn't one. Discharge direction is the result of chosen design for the tractor and that was left up to the individual manufacturers.
An engine must do two things. It has to propel the tractor and secondarily, it must power attachments that rotate. Some manufacturers cross-mounted their engines and some put the crankshaft in line with the frame. There was no right or wrong way. Gravely had models with an Onan twin mounted behind the rear axle, as an example. The early Colt models did not have a PTO clutch, nor did the 1965 Case 130/180 models. Instead, they had mechanical leverage that tightened the drive belt for the deck.
PTO clutches did not appear until 1966. If you look at cars, trucks and tractors, their drive trains are all connected to the rear of the engine. When Colt came up with their design in 1962, they bolted the pump onto the back of the engine and it stayed there until 1989. That decision is what dictated which side the grass clippings exited the deck. When Ingersoll turned the engine 180 degrees in the frame in 1989, the discharge side also changed by 180 degrees.
I couldn't help but notice that you did not disclose where you live when you filled out your membership. When that bit of information is shown under your screen name all the time, it helps other members who may be inclined to try and help you with your problem. Many members end up with a spare deck or two and would be happy to sell you one of them but shipping is often a major stumbling block.
However, people do travel here and there and sometimes a meeting can take place at a half-way point. Showing where you live, allows a member to glance at your screen name box and instantly decide whether there is something they can do to help or not. And the above is not directed solely at you because I see many members fail to fill in that box when joining.
We aren't prying when we ask for that information. Whatever you put in those boxes stays with this site, permanently. No outsider has access to it and they never will.
You could also put a "Wanted to Buy" listing on the site bulletin board if you have not done so already. That area gets quite a bit of traffic but you have to tell people where you are. Don't be shy. Most of us don't bite. :sidelaugh: