You can go to the Briggs site and download a parts manual. Hopefully this link will work. The engine I came up with doing a quick web search is- 91202-1017 It should be PN 494559 Here is a link that might be useful: Link

Try contacting Norwalk Power Equipment in Southern California. They sell manuals and illustrated parts list reasonably priced. I'm not aware of PDF's of Tru-Cut available anywhere on the web. Here is a link that might be useful: Norwalk Power

Was the mower used commercially? If it was approach this deal cautiously. Some commercial users can pretty much use up their mowers in a few years. I'm wondering why it hasn't been used since the new clutch was installed. Sounds like something is wrong. If used only by a home user for his lawn, it could be OK but still, why the no use since clutch replacment? These are expensive mowers and pretty well made, 500 for one in truly good condition isn't all that bad, maybe a little high but worth checking out if not used commercially. Check condition of drive chains. Check operation of clutch controls. You should be able to feather drive and blade clutch, releasing them and they stop. Or press further to lock them in. Look at reel and bedknive blades for what appear to be excessive wear. They are expensive to replace. On each side of the mower body there is a unpainted disc which is used to adjust clearance of the reel to the bedknife. Its an eccentric. Each of those discs have two shallow holes for a proper adjusting tool to rotate the disc. If those holes are all banged/smashed up the adjustment has been done by an idiot without proper tool. Would expect any other repairs/maintenance to be executed by same idiot.

I've never used a pull behind type gang set up of cutting units, but I do operate a Jacobsen LF123 Fairway mower at work. The toughest thing about a multi-cutting unit set up is getting all three or five or whatever set to the exact height and adjusted for reel/bedknife contact exactly the same. As an owner of many reel mowers, I can absolutely vouch for the workmanship and performance of the Tru-Cut product. I have owned McLane, Trimmer, and a Jacobsen 522PGM. My current Tru-Cut H-27 outperforms all of them and has equal construction to the Jacobsen. (a 5000.00 dollar mower) At 27 inches it makes quick work of most residential lawns. An acre though, I'm not sure about. Consider that if you start cutting that Tif low, you will be cutting every other day at the least. The 27 inch, 7 blade Tru-Cut sells for about 2000.00. A front roller, (mandatory) adds about 200.00, but this machine is effortless and is the only reel mower on the market that will cut from 3/8ths to 2 inches with operator controlled single-lever adjustment. I love mine, and you won't be disappointed.