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Chalmerswd48 
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Joined: 05 Nov 2017
Location: Utah
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 Topic: Kohler Commander CH23 engine into 620
Posted: 11 Apr 2023 at 9:23pm |
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I am trying to install a Kohler Commander CH23 into Allis Chalmers 620.
I am struggling with how to get the CH23 to connect to the drive line, and also the rear pto. I would think their is a clutch hub out their, but not having any luck finding one.
I can't be the first one to do this.
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Wes (VA)
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Joined: 12 Sep 2009
Location: Elkton, VA
Points: 510
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Posted: 11 Apr 2023 at 10:40pm |
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I put a CH20s into a steiner. I ended up making a pto shaft. Started with an old axle out of a JD AMT622. It was splined into a sprocket, so I welded them together, took it to my machinist cousin who cut the sprocket down in a lathe and drilled 4 holes to mount to flywheel. A key cut in the shaft and voila! Lovejoy coupler and away you go!
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DaveKamp
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Joined: 12 Apr 2010
Location: LeClaire, Ia
Points: 5639
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Posted: 12 Apr 2023 at 6:39am |
Are you trying to couple the flywheel (non-PTO) side of the engine to the transaxle? If so, yes, the flywheel side PTO needs to be fitted with an accessory, and there are flywheel PTO adapters made for this, typically they'll be for a specific application, and if you happen upon one of those applications in the recycle ranks, you liberate it.
I put a Vanguard 23, then a GX660 in my Cub Cadet... I had to make PTO adapters for both. It wasn't difficult, but I have machine tools at my disposal.
Typically, these engines will have mounting bosses in the flywheel specifically for the PTO accessory. Sometimes what they'll do, is make the PTO accessory a two-piece item, where ONE replaces the flywheel washer and has a 'drive pin' in the flywheel... remove the flywheel nut and washer, drive in the 'drive pin', then place the 'cup' portion of the adapter onto the shaft, and install the flywheel nut with a socket... and then the PTO shaft stub flange bolts to the adapter.
Other times, you just remove the screen, bolt the adapter's stub flange directly to the flywheel's preexisting bosses, and then replace the screen.
I have a CH-23 vertical on my commercial zero-turn, and I'll be popping the shroud and screen off for a little service work here in another week or so... if my CH23 (a Command 7000 series) has same setup as yours, I could whip you up one... just let me know what you want on the shaft size for your mating coupling.
When I get back home (next week) I'll post pix of my Honda's adaption, and pix of my CH's flywheel. Post yours, we'll compare. Requires about 2 hours with lathe, mill, drill, and welder, some scrap plate and tubing.
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Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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Chalmerswd48
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Joined: 05 Nov 2017
Location: Utah
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Posted: 12 Apr 2023 at 1:49pm |
This is a picture of what another guy made. I don't have a mill or lathe to do this. This still doesn't fix being able to have the double pulley needed to connect to the driveline and still be able to operate the rear pto.
This is a rig that my friend is thinking to use. I am a not convinced. Basically bolting on a hub, two random pullies, and then sandwiched in. 
and then this to squish them together.
I am just shocked that the only thing close to this is buying a repower kit, already have the motor and it only has 500 hrs. Wish I had a mill and lathe.
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DaveKamp
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Joined: 12 Apr 2010
Location: LeClaire, Ia
Points: 5639
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Posted: 12 Apr 2023 at 9:39pm |
So... I'm NOT an AC garden-tractor guy, I'm mostly Cub Cadet with my stuff, so don't misinterpret my ignorance...
What I'm seeing, looks like a driveshaft to the transaxle, where the FRONT end of the driveshaft is on a swinging arm, springs hold it DOWN, and the drive belts go from that lower 'movable' pulley, up to the two FIXED pulleys on the flywheel side of the crankshaft... and depressing the CLUTCH pedal lifts the driveshaft's front end and sheaves up TOWARDS the engine pulley, which makes that now a 'clutch'?
It appears that the two belts work together (they have same function, they're just a matched pair?
If so, the driveline really only needs to have some doohicky turned that fits onto the flywheel's aux PTO bosses, and accepts a pair of machined steel V-belts... yes?
Take all the adapter stuff you might have in there, and get it out of the way, lemmie see your flywheel with the grass screen, and whatever auxiliary PTO mountpoints may be in there.
I suspect It is probably much easier to make than it seems.
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Ten Amendments, Ten Commandments, and one Golden Rule solve most every problem. Citrus hand-cleaner with Pumice does the rest.
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HudCo
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Joined: 29 Jan 2013
Location: Plymouth Utah
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Posted: 12 Apr 2023 at 9:49pm |
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you need to buy a stub shaft from kohler that bolts on the flwheel then you can use the pulleys that come on the onan also your crankshaft center line on that engine is differant you will need to make engine mounts that raise that engine
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steve(ill)
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Joined: 11 Sep 2009
Location: illinois
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Posted: 13 Apr 2023 at 1:13pm |
something like this..........ebay
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Like them all, but love the "B"s.
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HudCo
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Location: Plymouth Utah
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Posted: 13 Apr 2023 at 9:26pm |
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yes like that one but you can order by shaft diameter and lenght so dont just get any one that fits a kohler
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Codger
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Posted: 14 Apr 2023 at 9:01am |
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I replaced a 7.25hp Briggs engine in a 725 Simplicity tractor with a 12hp Briggs engine and used two universal joint assemblies ordered from Mcmaster-Carr and ran it for years. The crankshaft centerline to mounting base height was different but with properly phased universal joints in the driveline, it performed very well.
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A career built on repairing and improving engineering design deficiencies, shortcomings, and failures over 50 years now.
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HudCo
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Location: Plymouth Utah
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Posted: 14 Apr 2023 at 9:39pm |
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that has to belt up and be part of the clutch assembly
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HudCo
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Posted: 14 Apr 2023 at 9:42pm |
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you still have to hook to your pto shaft also
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