Description

Unspecified CM224, CM224FR, CM224J, CM274, CM274FR Parts Catalog

You’re ordering a piston ring. You look up the engine serial number, but the parts counter guy just shrugs. Then you find out the ring you bought is for the wrong cylinder block revision. That’s a wasted afternoon and a lost customer. I’ve been there. That’s why I only trust a factory parts catalog – not some aftermarket copy that skips the interchangeability codes. This Unspecified CM224, CM224FR, CM224J, CM274, CM274FR Parts Catalog is the original OEM document, 94 pages thick, printed from the same plates the dealer used. It tells you exactly which part fits which build number.

Engine Sections: Cylinder, Crankshaft, Camshaft

The first 31 pages cover the engine. Section 101 is the ENGINE assembly. Section 102 is the CYLINDER BLOCK – note that the 224 and 274 blocks are separate pages. You get the CYLINDER HEAD for 224 on page 4, and for 274 on page 6. Then 104 CRANKSHAFT, PISTON starts on page 9. Section 105 CAMSHAFT is on page 12. Every exploded diagram has key numbers that match the parts list. If you need the oil pump for a 224, that’s page 13; for a 274, page 15.

I’ve seen guys try to use a 224 crankshaft in a 274 because they looked similar. This catalog shows the different part numbers and the interchangeability symbols – A, B, D, E, F – so you know if old parts fit new assemblies. The timing gear case and governor are section 107, page 17. Injection pump pages are separate for 224 (page 21) and 274 (page 23).

Why OEM Part Numbers Matter for These Models

Aftermarket catalogs often merge the 224 and 274 into one generic list. That’s a fast way to bolt on a wrong nozzle holder or injector pump. This catalog keeps them separate: nozzle and holder for 224 on page 24, for 274 on page 25. The starting motor pages are also split – 224 on page 27, 274 on page 28. If you’re ordering a starter for a CM224FR, you need the exact engine code. The catalog gives you the model code table right on page 1: CM224 is 390100, CM224FR is 390101, CM224J is 390102, CM274 is 390301, CM274FR is 390302. Cross-reference that with your machine’s serial number before you buy.

Chassis and Hydraulic Sections

From page 32 onward it’s chassis: battery (page 33), fuel tank (same page), muffler and engine support for 224 on page 34 and 274 on page 35. There’s a joint and P.T.O tension section on page 37, and the H.S.T. (hydrostatic transmission) is page 39. If you’re rebuilding a drive system, having the OEM part numbers for seals, bearings, and the HST unit itself saves you from ordering parts that look right but don’t seal.

How to Read the Parts List (from the Manual’s Own Instructions)

The first three pages explain exactly how the list works. You match the index number on the illustration to the index number in the table. The parts number column is where the factory part number lives. Quantity per assembly is given. The interchangeability column uses those letters I mentioned – A means old and new parts fit both ways, B means new fits old but not vice versa, D means no interchange, E is added parts, F is discontinued. The dimensions column gives standard sizes – diameter, length, thickness. And the remarks column often includes the original Denso part number if it’s an electrical component. You don’t need to guess. It’s all there.

Who Needs This Catalog?

Home garage guys restoring an old Shibaura mower or compact tractor will find the engine and chassis blowups essential. Small shop owners who service multiple CM224 and CM274 machines need this on the bench to avoid ordering the wrong injection pump. Beginners – read the “How to consult parts list” section on page 3 in both Japanese and English. It’s written in plain language. Even if you’ve never used a factory parts catalog before, the diagrams and key numbers are intuitive. But don’t skip the serial number check – the whole catalog is built around engine and chassis production breaks.

Related manuals you might need: Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide, Futura FC200-FC400 Parts Catalog – OEM Wear Parts Specs, Longagribusiness 410 DTC, 450, 450 DTC, 470 DTC, 530 DTC 2002 Parts Catalog. For background on engine architecture, see Automotive Industry Overview or Internal Combustion Engine.

FAQ

Does this catalog cover the CM274J model?

Yes. Model CM274J (code 390303) is listed in the model table on page 1, though the catalog does not include a dedicated engine section for the J variant. Use the standard 274 engine sections for cylinder head, crankshaft, and injection pump.

Are torque specifications included?

No. This is a parts catalog, not a service manual. It gives part numbers, quantities, and interchangeability codes. You need the factory shop manual for torque values.

Can I use this catalog to identify a part by illustration only?

Yes. The illustrations show assemblies and individual parts with key numbers. Match the key number to the parts list to get the part number. The illustrations are not exact shapes, but they are accurate enough for identification.

What if I need a part that is marked “discontinued” (interchangeability F)?

Contact a dealer. The catalog notes discontinued parts and the applicable machine build number. Some superseded parts may exist, but you’ll need to check with the manufacturer.

You’ve been burned by aftermarket part numbers before. Stop guessing. Get the exact factory document that service departments use. Access the Factory Manual today and keep it on your workbench.