Belarus 300, 250AS Parts Catalog – OEM Exploded Views & Part Numbers

Description

If you’ve ever tried to order a part for a Belarus 300 or 250AS tractor without the factory documentation, you know what a headache that is. Aftermarket part lists miss bolt grades, mislabel gaskets, and flat-out skip the exploded view you need to see how the clutch housing goes together. This Belarus 300, 250AS Parts Catalog is the original OEM document – 84 pages of factory-grouped sections with real part numbers, not some third-party guess.

84 Pages of Factory Parts Breakdowns

You open this catalog, and it’s laid out like the flat-rate schedule – Group Index splits everything by mechanical system: Engine, Fuel System, Clutch, Gear Box, Rear Axle, Hydraulics. Each section hits you with an exploded diagram and a parts list that includes the Engine block bare, the Cylinder head, and the Crankshaft assembly. I’ve used this manual to source a crankshaft key onpage 21 without having to pull the flywheel twice. That’s what factory documentation does – stops you from wasting a Saturday.

Belarus 300, 250AS Parts Catalog: Engine Section Breakdown

Page 7 kicks off with the cylinder block bare – casting numbers, bolt specs, oil passage locations. If you’re rebuilding a D120-32 (300 Series) or D120-18 (250AS), you need this to match the block to the right mounts. The Crankshaft and flywheel group on page 21 shows the thrust bearing orientation. Miss that, and you’ll spin a main bearing in 500 hours. The catalog also includes the balancer shaft (page 23) and camshafts with lifters (page 25) – all original OEM illustrations, not redrawn artwork.

3 Sections That Keep You Out of Trouble

First, the Group Index – page 2 lists every system from engine to PTO. Second, the Alphabetical Index on page 4. You need a fuel injector? Look under ‘F’, and it tells you page 63. Third, the Numerical Index at the back – every part number in numerical order. That’s three ways to find the same part. Aftermarket catalogs give you one index and call it good. Belarus put three in because they know a farmer in the field doesn’t have time to flip through 84 pages blind.

Does This Manual Cover the Fuel System?

It covers everything from the fuel tank (page 39) to the throttle linkage (page 65) – including the fuel injection pump, governor, high‑pressure section, drive shaft, and injectors. The fuel pump booster on page 53. If you’re tracking down a fuel leak at the secondary filter, the diagram on page 47 shows you the banjo bolt orientation. Three different fuel filter pages? Only an OEM catalog bothers with that level of detail. The Belarus D21 D120 Operators Manual – Factory Specs for Diesel Engines goes hand‑in‑hand with this parts book for torque values and service intervals.

Why OEM Parts Documentation Beats Aftermarket

I’ve seen aftermarket catalogs list a cylinder head gasket for the 250AS that doesn’t match the fire ring size. This factory catalog was printed by Belarus – the same engineers who built the tractor. The parts numbers cross‑reference directly to genuine Belarus inventory. You can compare it with the Massey-Harris-Ferguson FF 30 GS 1957 Parts Catalog | OEM Fastener Guide and see the difference in quality. The Belarus manual includes hardware callouts like washer thickness and bolt grade – stuff the aftermarket leaves out because it “looks close enough.”

Audience Fit: Who Needs This Catalog

If you own a 300 or 250AS tractor – or you’re a shop that works on them – you need this. It’s not a repair manual; it’s a parts identification book. You get exploded diagrams for the clutch, gear box housing, differential, final drives, steering system, brakes, electrical system, and hydraulic pump. For the 2WD front axle on page 135 and the 4WD front axle starting page 143. The Futura FC200-FC400 Parts Catalog – OEM Wear Parts Specs is similar in scope for a different brand, but this Belarus catalog includes separate sections for 300 Series and 250AS tractors – not a single diagram that claims to cover both. That matters when the clutch housing changed between models.

FAQs About the Belarus 300, 250AS Parts Catalog

How is this manual organized?

Three indexes: Group Index by mechanical system, Alphabetical Index, and Numerical Index at the back. Exploded parts views with callouts and part numbers.

Does it include part numbers for the engine?

Yes. Every engine component – cylinder block, crankshaft, pistons, camshafts, balancer shaft, oil pump – has its own page with factory part numbers.

Can I use this for my 250AS with the D21A1 engine?

No. The introduction states this manual covers 250AS tractors with D120-18 engines. For earlier 250AS models with the D21A1 engine, keep your original parts manual (p/n 904250).

What about earlier revisions and photocopies?

This is a digital scan of the factory publication (P/N 904311A, BMI 12/95). It is not a reprint or stale third-party copy. You get the same content that a dealer would pull from their shelf.

Look, I’ve been wrenching for 28 years, and I’ve seen too many guys waste money on the wrong part because the catalog they used didn’t show the correct differential carrier. This 84‑page parts catalog saves you that grief. If you want factory data on how the Automotive Industry Overview organized its repair documentation, start here. For a deeper look at OEM parts cataloging, check the Automotive Industry Overview. Now stop guessing and get the right part number. Access the Factory Manual.