Part of the Yanmar Parts Manuals.
Chasing a leak back through the hydraulic oil tank on a Yanmar B12-2B means knowing exactly which fitting, seal, and hose clamp sits where. The exploded figures in this Yanmar parts catalog (publication Y00K3442) lay that out for the B12-2B and B17-2B crawler backhoes, serial numbers 30501 and up, across 148 pages.
Every rebuild stalls at the same point: the dealer counter wants a part number, not a description of the broken piece in your hand. This catalog gives you that number, opening with a picturesque index of main parts and continuing into dedicated figures for the electric parts, canopy, hydraulic oil tank, tools, link stand, and labels. A specifications page and the factory painted color lists round out the book.
It is a standard PDF download, so print the figure you need and take that page to the bench, where it can get as dirty as the job.
What's Inside This Yanmar B12-2B, B17-2B Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Parts Index — Main Machine | Main parts, Canopy, Safety labels, Structural components | |
| Hydraulic System Parts | Boom cylinder, Piston seal 172137-72463, Hydraulic pump, Gasket sets | |
| Electrical / Wiring Parts | Electric parts, Wiring harness, Wiring schematics | |
| Crawler / Undercarriage Parts | Track assembly, Final drive, Travel motor, Seal kit 172183-73930 | |
| Boom, Arm & Bucket Parts | Boom assembly, Arm/dipper, Bucket, Pins and bushings |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Yanmar B12-2B / B17-2B Crawler Backhoe | ||
| Parts Catalog | ||
| 148 | ||
| Y00K3442 | ||
| 172137-72463 | ||
| 172183-73930 |
Yanmar B12-2B, B17-2B Common Problems This Manual Covers
Hydraulic leaks traced to the tank
Weeping fittings and a slowly dropping oil level on these crawler backhoes usually end at the hydraulic oil tank and its plumbing. The Hyd. Oil Tank figure identifies every seal, fitting, and clamp so you can order the exact replacement instead of guessing at the counter.
Manual Section: Hyd. Oil TankBoom cylinder drifts under load
A boom or bucket cylinder that bleeds down while holding a load points to worn internals, and a reseal only works with the right parts. The main parts index locates the cylinder assemblies and their components by figure so you can pull correct part numbers before opening anything up.
Manual Section: Picturesque Index (Main Parts) p. 7Electrical gremlins on an aging machine
Corroded connections, dead batteries, and failed switches are routine on machines of this era, and half the battle is naming the exact component. The Electric Part figure breaks the electrical hardware down piece by piece for ordering.
Manual Section: Electric PartSloppy backhoe linkage pins
Play in the digging end shows up as a clattering bucket and imprecise control, and it comes from worn pins and bushings in the linkage. The Link Stand figure shows each pin, bushing, and related part in its position so you replace the whole worn set in one order.
Manual Section: Link StandBent or damaged canopy hardware
Working a compact backhoe around trees and structures eventually costs you canopy parts. The Canopy figure identifies the frame pieces and mounting hardware individually, so a single bent member does not mean sourcing a whole assembly.
Manual Section: CanopyRepainting after rust or repair
Patch repairs and rust treatment on a 1990s machine end with a color match problem. The painted color list gives the factory Yanmar colors used on the Jp and Ex machines, and a companion table maps paint part numbers to the boom, arm, fuel tank, canopy, and blade.
Manual Section: Painted Color List(B12-2B,B17-2B Jp,Ex) p. 3Frequently Asked Questions
Which machines does this parts catalog cover?
It covers the Yanmar B12-2B and B17-2B crawler backhoes, serial numbers 30501 and up. It is Yanmar publication Y00K3442, in English, 148 pages.
Is this a service or repair manual?
No. It is the factory parts catalog: exploded figures with part numbers for identifying and ordering components, from the main parts index through the electric parts, hydraulic oil tank, canopy, and link stand figures. It does not contain repair procedures or torque values.
Does it include machine specifications?
Yes. The Specifications section lists engine, dimensions, standard bucket capacity, maximum digging depth, travel speed, and battery details for both the B12-2B and B17-2B. p. 2
Are factory paint codes included?
Yes. The painted color lists give the factory colors, including Yanmar Peacock Green and Yanmar Dark Olive Gray, with a separate list for B17-2B As machines, plus a table of paint part numbers for main parts such as the boom, arm, fuel tank, canopy, and blade. p. 3
What exactly do I receive with this Yanmar B12-2B Parts Catalog?
Immediate download of the complete 148-page searchable Parts Catalog (4 MB). Access it on any device, from a laptop at your desk to a phone in the field.
Am I able to print pages from this Yanmar B12-2B manual?
Absolutely. No DRM or copy protection. Print the whole manual or just the pages you need. Any home or office printer works.
Are there hydraulic schematics in this Yanmar B12-2B manual?
Yes. The manual includes a hydraulic system diagram covering the main circuits.
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