Description

HMF 31 Parts Catalog – What You Need on the Workbench

If you’re rebuilding a HMF 31 Parts Catalog – specifically the Massey Ferguson MF 31 combine – you already know the headache of chasing down the wrong part number from a worn-out tag. I’ve been turning wrenches for 28 years, and nothing wastes time like ordering a part that doesn’t fit because someone wrote down the number from a blurry photo. This manual stops that dead.

This isn’t a service manual – it’s an original OEM parts catalog straight from the factory. No third-party guessing, no aftermarket reprints. You get exactly what HMF printed for their dealer network. And yes, there’s a difference between a parts catalog and a repair manual. You need both, but without this catalog, you’re ordering blind.

Why a Parts Catalog Beats Guessing on a Combine

Combines have thousands of parts. One wrong bolt size on the straw divider and you’re looking at a field repair that costs you a day. The MF 31 combine has specific part numbers for every clip, shim, screw, and locknut. Page 41 in the straw divider section lists the exact locknut D41087600 for the support brackets. You can try matching it by eye, but I’ve seen guys strip threads because they grabbed a coarse-thread nut where a fine-thread one belonged. This catalog shows you the quantity, description, and any positioning notes like “POS. 25-28.” That level of detail saves you the return trip to the dealer.

348 Pages of Factory Part Numbers

Three hundred and forty-eight pages. That’s not a pamphlet – that’s a comprehensive breakdown of the entire machine. Sections cover everything from the straw divider assembly to the knives and fingers, feeder housing, sieves, rotors, and hydraulic components. Each page uses exploded-view drawings with numbered callouts that match the part number table below. You get the OEM part number, the quantity required per assembly, and the description in plain language. For example, knife clips: D25200899 in 14-inch, 16-inch, or 18-inch variants. That info comes from the original HMF engineering data, not some aftermarket editor taking notes from a blurry photocopy.

Do You Really Need the Exact Fastener?

Short answer: yes. Long answer: combine harvesters see vibration, dust, and heavy loads. Using a grade 8 bolt where a metric class 10.9 is spec’d will crack under stress. Using a split ring D41447300 that’s a hair too thin won’t hold the divider point. This catalog lists the correct hardware – D40066800 screw metric, D20400471 washer, D41087600 locknut – all with the exact dimensions and thread pitch. I don’t care if you’ve been at this for years; you cannot eyeball thread pitch on a dirty bolt. Look it up here, order the right part, and move on.

Read the Exploded View Before You Start

One mistake I see home garage guys make is tearing something apart without noting how the pieces sit. An exploded view in a parts catalog is your map. The straw divider section (page 1-1) shows the divider point D28251801 sitting on split ring D41447300, held by locknut D41087600. The support brackets D28230465 (right hand) and D28230466 (left hand) are clearly separate – don’t mix them up. Take that drawing to the bench. Mark the page number in your phone. It’s faster than trying to remember where that shim went three days later.

Straw Divider Assembly: A Real-World Example

Look at the table on page 2. Item 7 shows two different points: D28251802 and D28251801, for position 2-7. There’s a note: “POS. 2-7” on the point itself. The catalog tells you the right-hand divider D28251622 uses one set of parts, left-hand D28251623 uses another. The mounting supports (items 25-28) include a hexagon screw D40424400, two mounting brackets D28230468 and D28230471, and a locknut D41087500. If you need the wing assembly (items 40-53), you get the wing D28230480, split pin D41410600, support D28230482, handle D27200364, pipe D28230486, and clutch D28230488. That’s ten parts you can order in one trip if you have the catalog open.

OEM Authenticity – Not Aftermarket Copy

The PDF you get from AutoRepairManuals is a direct scan of the factory-issued HMF parts catalog. You’ll see the original page numbers, the same (F0) and (F1) right/left notations, and the exact Massey Ferguson logos. Aftermarket parts catalogs often compress drawings, remove comments, or renumber items. That’s fine for a quick reference, but when you’re ordering parts for a combine that costs more than your house, you want the source document. I’ve compared aftermarket versions to OEM and found missing positions. This one has 348 pages – the full factory release.

Related manuals you might need alongside this catalog: MF 31 Combine Harvester 1975 Parts Catalog for early-model variations, HMF MF 500 1968 Parts Catalog – OEM Factory Parts Book if you work on the larger models, and HMF MF 33 Parts Catalog – Factory Parts Book (330 Pages) for the MF 33 combine. For background on how these machines evolved, see the Automotive Industry Overview and also the Automotive Industry Overview for agricultural equipment context.

Q: Will this catalog tell me how to rebuild the hydraulic system of the MF 31 combine?

No. This is a parts catalog, not a service manual. It shows you the hydraulic pump part number and the seals, but not the removal sequence or pressure specs. You need a factory service manual for that. Use the parts catalog to order the correct components before you start the rebuild.

Q: Can I use this manual for the MF 31 combine built after 1976?

This edition covers the MF 31 combine with serial number 819726. Serial number breaks matter. If your machine is later than that serial, some parts may have superceded. The catalog includes up to the listed serial range. Check your machine’s serial plate before ordering – a mismatch means you need a later revision or a supplement. HMF issued change notices; this PDF reflects the original release.

Stop wasting time on wrong part numbers and back-ordered bolts. Get the factory document that says exactly what goes where. Access the Factory Manual now and keep your combine running.