All 127 pages of this Yanmar B12-3 Parts Catalog map every component of the 2000-production Crawler Backhoe, from engine mounts to hydraulic oil piping, in factory part-number detail. Inside, you get exploded assembly views covering the engine, crawler drivetrain, cab, boom and arm cylinders, and the complete hydraulic piping network from tank to pump to control valve. Open to the hydraulic section for full oil routing schematics, or jump to the wiring diagram tracing battery, starting motor, dynamo, glow plug, and oil pressure switch connections. Coverage starts at engine serial 81954, production date July 2000, so you'll know exactly which part numbers apply to your machine before you order a single piece. No more reading off worn casting numbers and hoping the counterman guesses right. Bookmarked by system, searchable by keyword: pull it up on your tablet and have the right part number in hand before you even reach the counter.
What's Inside This Yanmar B12-3 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Preface | 1 | - |
| Vehicle Painted Color | 2 | Yanmar New Permanent Yellow, Yanmar New Grayish Green, Yanmar Deep Green, Yanmar Dark Olive Gray, Yanmar Red |
| Paint Part No / Color of Main Parts | 3 | Hood Part, Operation Machine Part, Engin Related Canopy Body and Cover, Driving Frame Part, Blade, Lock Lever |
| Wiring Diagram | 4 | Battery, Starting Motor, Dynamo, Glow Plug, Oil Pressure Switch, Hour Meter |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Vehicle Model Name | B12-3 | p. 1 |
| Vehicle Manufacturing Date (from) | 2000/7~ | p. 1 |
| Engine Manufacturing Date (from) | 2000/4~ | p. 1 |
| Engine Serial Number (from) | 81954~ | p. 1 |
| Spring Washer Size | 8 | p. 16 |
| Bolt W/Washer Size | M10X25 | p. 16 |
| Nut Size | M 8 | p. 16 |
| Clamp Size | 60 | p. 16 |
| Fuse Rating | 40A | p. 32 |
Yanmar B12-3 Common Problems This Manual Covers
Yanmar B12-3 electrical system completely dead and need the correct main fuse replacement part number p. 4
Check the Wiring Diagram on page 4 to find the main electrical routing. Locate the main fuse block assembly and verify you are ordering the correct 40A rated fuse shown on page 32. Inspect the surrounding harness connections for corrosion before installing the new component.
Manual Section: Wiring DiagramCan't find the correct replacement part numbers for leaking hydraulic boom cylinder seals
Review the Hydraulic Parts Diagram to find the exact cylinder breakdown. Match your cylinder housing to the exploded view to find the correct seal kit. Verify the mounting hardware, including the size 8 spring washers noted on page 16, before placing your order.
Manual Section: Component Identification (Hydraulic Section)Need to order the exact matching factory touch-up paint for rusted hood and driving frame parts p. 2
Verify the required color codes in the Vehicle Painted Color section on page 2. Match the hood and frame components to the Yanmar New Permanent Yellow or Yanmar Deep Green specs. Order the correct 4L can or spray part number listed on page 3.
Manual Section: Vehicle Painted ColorMissing mounting hardware for the engine exhaust silencer and need exact replacement bolt sizes
Check the Engine Parts Diagram to identify the missing exhaust components. Locate the specific fasteners in the exploded view and verify you need the exact M10X25 bolts with size 10 spring washers listed on page 20. Order the exact quantities shown.
Manual Section: Component Identification (Main Parts)Frequently Asked Questions
What are the replacement specifications for hydraulic hoses?
The manual, being a parts catalog, provides specific part numbers and sometimes dimensions for hydraulic hoses. For example, a hose is listed as part number 172151-13381 with a length of "L=1400", and another as part number 172447-78100 with dimensions "25.4 X 37.5". These details serve as replacement specifications to ensure the correct part is used.
What are the replacement specifications for hydraulic seals?
The manual lists various hydraulic seals with their part numbers and often includes dimensions. For instance, a seal is specified as part number 172171-81280 with dimensions "35X45X4", and another as part number 172183-72290 with dimensions "38X48X 4, DUST". These part numbers and dimensions are the replacement specifications provided.
How do you fix yanmar B12-3 electrical system completely dead and need the correct main fuse replacement part number?
Check the Wiring Diagram on page 4 to find the main electrical routing. Locate the main fuse block assembly and verify you are ordering the correct 40A rated fuse shown on page 32. Inspect the surrounding harness connections for corrosion before installing the new component.
How do you fix can't find the correct replacement part numbers for leaking hydraulic boom cylinder seals?
Review the Hydraulic Parts Diagram to find the exact cylinder breakdown. Match your cylinder housing to the exploded view to find the correct seal kit. Verify the mounting hardware, including the size 8 spring washers noted on page 16, before placing your order.
Is this Yanmar B12-3 Parts Catalog a digital download?
You get a 127-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print specific sections of this Yanmar B12-3 Parts Catalog?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
Can I find wiring schematics in this Yanmar B12-3 manual?
Yes, an electrical wiring diagram is included to help trace the main circuits.
Document Quality
This document is a scanned PDF with an added OCR text layer, allowing you to search and copy text throughout. The text is crisp and consistently easy to read, including smaller labels on diagrams. Diagrams and illustrations are clear scanned line drawings, with all labels remaining readable. Pages are clean with no scan artifacts or skewed content, though there are several blank or near-blank pages that serve as separators.
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