Description

Yanmar B12, B17 1989 Parts Catalog – What You Need on the Bench

If you’ve ever ordered a part for a B12 or B17 crawler backhoe from a third-party list and ended up with something that doesn’t fit, you know the pain. Aftermarket catalogs love to fudge numbers. This 1989 OEM parts catalog from Yanmar gives you the exact part numbers, the factory paint codes, and the wiring layout – no translation errors. I’ve been turning wrenches for twenty-eight years, and I’ll tell you straight: when you’re digging through a 40-year-old machine, the only thing you trust is the original print. This is that print.

Yanmar B12/B17 Parts Catalog: What You Actually Get

Open the PDF and you see 129 pages of factory data. The preface on page 1 tells you this catalog covers crawler backhoe models B12 and B17 for the UK and Australia. It lists the mounted engine – 3TNA72L-UBA for the B12, 3TNA72L-UBB for the B17 – and gives you the model codes. That’s the kind of detail you need to match a block or a head gasket. The parts name section later breaks down every assembly with figure numbers, and the wiring diagram section covers UK and AS/EX (Australia / other) variants. You won’t find a single generic illustration in here.

Wiring Diagrams: UK and AS/EX Variants

Two separate wiring diagrams live in this catalog. One for the UK market, one for AS/EX. If you’re trying to trace a short on an old Yanmar that’s been rewired three times, having the factory diagram means you can confirm every color and terminal. Aftermarket wiring books skip this distinction – they’ll show one diagram and call it good. Yanmar knew the electrical systems differed by destination. This catalog respects that. Use the diagram that matches your machine’s origin, or you’ll chase ghosts.

Specifications Section: B12-P vs B17-P – Know the Difference

Page 2 and 3 give you full spec tables for the B12-P, B12-PR and B17-P, B17-PR. Overall length, width, bucket capacity, digging depth, traveling speeds, climbing ability – every number is there. For example, the B12-P operating weight is 1250 kg, the B12-PR is 1170 kg. The blade capacity? 0.06 m³. If you’re ordering undercarriage parts, you need the PR variant numbers because the track frame geometry changes. This catalog gives you both. No assuming.

Paint and Color Codes – Not Just for Looks

Yanmar Saffron Yellow. YANMAR Cream White. YANMAR Charcoal Gray. The catalog lists Munsel numbers and paint codes for 16-liter cans and spray. When you’re restoring a machine or touching up rust, you want the factory color. Spray can code 977620-30381 for the yellow. If you spray an off-the-shelf yellow, it won’t match. That matters for resale and for keeping the machine looking like it left the factory. The catalog also tells you which color goes where – no guessing.

3 Common Mistakes When Ordering Parts for These Crawlers

Mistake one: ignoring the model code variants (B12-P vs B12-PR). The PR models have a different distributed weight and operating weight – that affects track tension parts. Mistake two: using a generic wiring diagram. Without the UK/AS/EX split, you’ll connect the wrong wires and burn a harness. Mistake three: skipping the parts name section to save time. That section cross-references every figure number with the countries where that figure applies. Skip it and you might order a UK-only part for an Australian machine. This catalog has the data to avoid all of that.

For other Yanmar crawler catalogs, see Yanmar B08-3, B12 2006 Parts Catalog – OEM Consumables and Ammann Yanmar B12 B17 Parts Catalog. The B17 variant also appears in Yanmar YB271, B27 1994 Parts Catalog – OEM Factory Specs. For wider context on heavy equipment documentation standards, visit Automotive Industry Overview. Another overview is at Automotive Industry Overview.

Does this catalog include part numbers for the engine?

Yes. The mounted engine is listed with its model code (3TNA72L-UBA for B12, 3TNA72L-UBB for B17). The parts name section covers engine assemblies with corresponding figure numbers. You can order piston rings, cylinder head gaskets, and injection components by the factory number.

Is the wiring diagram detailed enough to trace a short circuit?

It’s the factory diagram – wire colors, connector pinouts, and component locations are shown. For a 1989 machine, that’s as detailed as you get. Pair it with a multimeter and you can isolate any fault.

Can I use this catalog for a B17-PR?

Yes. The specification tables include B17-P and B17-PR separately. The parts illustrations apply to both variants unless noted. Check the figure number table in the preface to confirm which figures cover PR models.

What about the paint codes – are they still available from Yanmar?

Yanmar Saffron Yellow (code 933110-91603 for 16 liters, spray 977620-30381) and the other colors are still listed in current Yanmar paint systems. You can order them directly from Yanmar dealers or aftermarket suppliers who cross-reference the Munsel numbers. The catalog gives you the exact reference to avoid mismatched shades.

Stop wasting shop time on parts that don’t fit or wiring diagrams that lie. This is the same binder the dealer techs used in 1989. 129 pages of verified Yanmar data – specifications, wiring, parts names, and paint codes. Access the Factory Manual now.