Description

New Holland OM 421, OM 421A Parts Catalog

You’ve got a New Holland tractor with a Mercedes-Benz OM 421 engine, and you need a fuel filter element. You call the dealer, they ask for a part number. You dig through aftermarket cross-references, hope the fit is right, and waste a day when the wrong seal shows up. That’s where the Sperry New Holland factory parts catalog comes in. This 68-page document is the original OEM list for both the New Holland OM 421 and the turbocharged OM 421A. It’s not a generic parts listing — these are the exact Mercedes part numbers you need to order from your local Mercedes dealer, or the Sperry New Holland items marked with an Order Ref. No fluff, no reprints, no guesswork. The page 2 fuel filter group alone saves you the headache of mixing up banjo nipples and seal rings. For context on why OEM documentation matters, see the Automotive Industry Overview.

Fuel Filter Assembly: Exact Part Numbers for OM 421 and OM 421A

The fuel filter group (Group 11) occupies page 2 of this catalog. It covers 31 individual components — everything from the filter assembly (part 222 050 01 52) to the banjo nipples and seal rings. Each part number is listed with quantities for both the OM 421 and the turbo OM 421A, side by side. Some parts show different counts — for instance, item 9 (hex cap screw) calls for 3 on the OM 421 and only 2 on the turbo variant. If you slap a generic aftermarket kit on that engine, you’ll have leftover bolts or missing sealing washers. The catalog also includes the Sperry New Holland Order Ref. 450283 0 for the complete filter assembly, though that specific number must go through a New Holland dealer.

Pay close attention to the seal rings — item 4 uses a 000 447 31 80 seal, and it’s listed as quantity 4 for the 421, 2 for the 421A. Get that wrong and you’ll have fuel dribbling down the block.

Mercedes-Benz Engines: What This Parts Catalog Actually Covers

This catalog is strictly a parts identification manual for Mercedes-Benz engines OM 421 and OM 421A (Turbo) used in Sperry New Holland equipment. It does not include repair procedures, torque specs, or wiring diagrams. The opening note on page 5 explains that only the oil filter element and fuel filter element are available through the Sperry New Holland dealer; all other part numbers are Mercedes part numbers and must be ordered through your local Mercedes dealer. If you try to order a piston ring or injector line from a farm equipment dealer, they’ll look at you sideways. Keep a copy of this catalog at the parts counter — it eliminates the back-and-forth.

Ordering Service Parts: Why You Need the OEM List

Aftermarket parts catalogs merge multiple engine iterations into one vague reference. You end up with a seal ring that’s 1mm too thin, or a banjo nipple that doesn’t match the hose diameter. The Sperry New Holland catalog gives you Mercedes factory part numbers — the same numbers that Mercedes dealers use to pull inventory off the shelf. The column labeled “N.B.” flags items that have a Sperry New Holland Order Ref. for ordering convenience, but the rest are pure Mercedes. Page 4 shows the issue number 497049 7, replacing earlier editions 496923-497017. This is the most current release for these engines as of the catalog date.

Abbreviations and Symbols Decoded

Flip to page 5 and you’ll find the abbreviations table: Qty = Quantity, AR = As Required, NS = Not Serviced, NSS = Not Serviced Separately. Starred items refer to footnotes. There’s also a seal kit icon and a valve overhaul kit icon. LH and RH are defined from the flywheel end. If you ignore these codes, you might order a “hex cap screw” that’s actually a weld assembly (w/a) or a part that’s only available as a kit. The catalog uses these symbols consistently across all groups — once you learn them, you can use any Sperry New Holland parts catalog.

68 Pages of Factory Specs: What’s Inside

This is a 68-page bound document (digital format) covering all serviceable parts for the OM 421 and OM 421A. The sample pages show multilingual text (English, French, German, Italian, Dutch) — Sperry New Holland shipped these globally. Each group is numbered: Group 11 is the fuel filter, but the catalog includes groups for cylinder head, crankcase, injection system, cooling, and more. The exploded diagrams are clean and directly correspond to the part number table. If you’ve ever struggled to identify a broken part, this catalog gives you the diagram and the number in one glance. For further study on OEM standards, refer to the Automotive Industry Overview.

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• Ford New Holland 1915 Tractor 1993 Parts Catalog – Section: Supplement”>Ford New Holland 1915 Tractor 1993 Parts Catalog – Section: Supplement

Frequently Asked Questions

Can I use this catalog to order parts directly from Sperry New Holland?

Only for fuel filter and oil filter elements — all other parts are Mercedes-only and must go through your local Mercedes dealer.

Does this parts catalog include torque specifications or repair procedures?

No. This is a parts catalog, not a service manual. It contains exploded diagrams and part numbers for ordering. For torque specs, you need the factory service manual for the OM 421 engine. However, having the correct part numbers from this catalog ensures you’re not bolting on the wrong component, which is half the battle. A wrong seal ring can cause a fuel leak that’s expensive to chase down — the catalog prevents that.

How do I know if I have the OM 421 or OM 421A (turbo) engine?

Check your engine serial number plate. The turbo model has additional oil lines and a different fuel filter housing (note the differing quantities in the catalog). This manual lists both models side by side, so you can identify which parts apply to your engine.

What if a part is listed as ‘NS’ or ‘NSS’?

NS means Not Serviced — that component is only available as part of a larger assembly. You’ll need to order the assembly part number instead.

Stop wasting time with wrong parts. Access the Factory Manual now and get the exact OEM part numbers for your New Holland OM 421 or OM 421A engine.