Description

Yanmar YB301, YB301-1, YB301-2, YB351, YB351-1 1991 Parts Catalog

If you have ever ordered a part for a Yanmar crawler backhoe and ended up with the wrong seal or a bucket that doesn’t fit, you know the headache. After 28 years turning wrenches, I have seen guys lose a whole day because they trusted an aftermarket parts list. This is the real deal: the Yanmar YB301, YB301-1, YB301-2, YB351, YB351-1 1991 Parts Catalog. 248 pages of OEM part numbers, paint codes, and specifications straight from Yanmar.

What the 1991 Parts Catalog Covers

This catalog lists every part for the Yanmar YB301, YB301-1, YB301-2, YB351, and YB351-1 crawler backhoes. It includes machines from serial number 00501 for base models, 10501 for -1 models, and 20501 for -2 models. That covers the 3T84HL-BS and 3T84L-RB engines depending on the model code. The catalog went through five editions; this is the fifth edition issued in November 1991. If you have a YB351-2 or any of the listed variants, this is the correct reference.

Paint Codes and Color Changes – Important for Restoration

Page 1 of the catalog documents paint codes for both old and new color schemes. Older machines used Yanmar New Light Yellow (10YR6.5/8), Yanmar Cream (2.5Y9/1), and Yanmar New Dark Olive (5GY1/1). From October 1987, the cream changed to Cream White (5.0Y9/1) and the olive switched to Dark Olive II (7.5GY1/1). Spray and bulk paint codes are listed for each. If you are restoring a machine, do not guess the color – use the factory codes.

Specifications and Dimensions for Your Machine

Page 2 gives you dimensions, bucket capacities, digging depths, and operating weights for every model variant. For example, the YB301 has a standard bucket capacity of 0.12 m³ and max digging depth of 2780 mm. The YB351 bumps bucket capacity to 0.15 m³ and digging depth to 3130 mm. Travel speeds, climbing ability, and blade specs are all there. Operating weight ranges from 2800 kg on the standard YB301 up to 3250 kg on the YB351 with rubber crawlers. These numbers help you confirm you are ordering the right undercarriage parts.

Engine Model Codes – Identify Your Engine

The catalog lists which engine goes with which machine. The YB301 and YB351 both use the 3T84 HL-BS engine (model code 171064S and 129322S respectively). The -1 and -2 variants use the 3T84 L-RB engine (model codes 129131M and 129139M). This matters when you order injection pump, gasket, or cylinder head parts. Do not assume the engine is the same across all models – check the code on your machine against the table on page 1.

Using the Catalog: Part Number Index and Figure Numbers

The catalog is organized by figure numbers for each major assembly – canopy (Fig. 45-46), cabin (Fig. 47-49), engine (Fig. 103), hydraulic oil tank (Fig. 72106), and many more. Each figure shows an exploded view with numbered callouts. You find the part number, description, and quantity. This is how you avoid ordering a seal for the wrong boom swing cylinder. Also check the related manuals for other Yanmar models: Ammann Yanmar B12 B17 Parts Catalog, Yanmar Crawler Backhoe YB271 B27 Parts Catalog, and YANMAR YB401/YB401-2 Parts Catalog. For a broader perspective on machine documentation standards, see Automotive Industry Overview and learn about Automotive Industry Overview practices.

Does this catalog include repair procedures?

No. This is a parts catalog, not a service manual. You get part numbers, exploded views, quantities, and paint codes.

Will this cover the YB351-2?

Yes. The fifth edition covers all -1 and -2 variants including YB351-2 from machine number 20501.

What about torque specs?

This catalog does not list torque values. You need the Yanmar service manual for torque specs on the 3T84 engine and drive train.

Can I use this to order parts for a YB301 that has been modified?

If the modifications are aftermarket, the OEM numbers will not match. For stock machines, the catalog is accurate. Verify your machine serial number against the preface to confirm the edition coverage.

You have the serial number stamped on your machine. Open the catalog, match it to the edition, and start ordering the exact part. No more returns, no more waiting. Access the Factory Manual and get the right parts the first time.