Scag STT52-22CH Mower, Zero Turn Category
Original Model: Kohler Command CH22S-66546
This has a 1-1/8" (28.550 mm) shaft. PTO Mtg Face 3-11/32" (85 mm). The replacement engine is CH23S-76510. If you use the CH740-0084 engine there may be minor differences but parts should be interchangeable as needed. The shaft is a little longer but it is drilled and tapped 2" deep and the shaft is not hardened steel so it can be cut down if needed. You will have to use your muffler from the old engine. You would also have to make sure the canister air breather would not interfere with anything.
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While we may have sold many engines listed above to be used for a Scag STT52-22CH Mower, Zero Turn Category, we are NOT claiming these are exact replacements unless the product notes explicitly say so. Many original equipment engines may no longer be in production because of obsolescence or EPA regulations, so in some cases there may not be an exact replacement available. Our intention here is to show that other customers have utilized these in the equipment shown, but may have had to make some modifications to do so. If we know of any required changes, we will list those, however, some adapting during installation should be expected.