All 144 pages of this B12/B17 Parts Catalog zero in on one thing: getting the exact part number for your 1989-1995 Crawler Backhoe. Every variant in the family, B12 and B17, is covered assembly by assembly. Inside: exploded-view parts lists for every cylinder group (boom, arm, bucket, swing, blade), the travel motor, control valve, turning frame, and swivel joint, plus the wiring diagram and hydraulic schematics. The preface decodes the fixed and variable parts code system and four-edition design change history, so the correct part number for your serial number range is never in doubt. No more ordering blind. Bookmarked and searchable by keyword; open it on any device and find the assembly before you pick up the phone.
What's Inside This Yanmar B12–B17 Series Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Preface | 1 | Parts Catalog Organization (Fixed and Variable Parts Codes), Replaced Parts Codes, Design Change History (1ST Edition, 2ND Edition, 3RD Edition, 4TH Edition) |
| Specifications | 2 | Model, Type, Overall Length, Overall Width, Overall Height, Bucket Capacity, Outside Width of Bucket, Max. Digging Depth |
| Parts Name | 3 | ROPS, Electric Parts, Hyd. Oil Tank, Inlet Hose & Exhaust Pipe, Engine Mount & Radiator, Fuel Tank & Fuel Line, Bonnet, Hyd. Oil Pump & Joint |
Yanmar B12–B17 Series Common Problems This Manual Covers
B12 or B17 serial plate is worn off, can't confirm exact variant to order correct parts
Locate the identification label position on your machine using the label parts diagram. Then open the specification table on page 2, which lists overall dimensions and bucket capacity for each B12 and B17 variant. Compare your machine's physical measurements to the table to confirm the exact model designation before placing any parts order.
Manual Section: Label PartsBoom cylinder seal kit part number is unclear, exploded view shows several sub-assemblies with no obvious seal group
Turn to the boom cylinder exploded view. Each seal, O-ring, and wiper is listed individually with its own part number in the parts list. Confirm which catalog revision applies to your machine by checking the design change history on page 1, then order only the seal components shown for that specific edition.
Manual Section: Boom Cylinder PartsWiring diagram shows a damaged connector or blown fuse, but the correct replacement part number is missing
Open the wiring diagram to trace the faulty circuit and read the component label at the failure point. Cross-reference that label against the electric parts listed in the parts name section on page 3. The parts list pairs each labeled component with its catalog part number for direct ordering.
Manual Section: Wiring DiagramFrequently Asked Questions
What are the replacement specifications for hydraulic hoses?
The manual lists various hydraulic hoses by part number and descriptive name. For example, for the HYD.OIL TANK section, a replacement specification for a hydraulic hose is "PIPE P202FF095" with part number 172137-78520, quantity 1. Other hoses are listed with their respective part numbers and quantities across different sections.
What are the replacement specifications for hydraulic pump?
The replacement specification for the hydraulic oil pump is provided as an assembly part number. For the TURNING MOTOR section, the "PUMP ASSY, HYD. OIL" has a part number of 172149-73110, with a quantity of 1.
How do you fix B12 or B17 serial plate is worn off, can't confirm exact variant to order correct parts?
Locate the identification label position on your machine using the label parts diagram. Then open the specification table on page 2, which lists overall dimensions and bucket capacity for each B12 and B17 variant. Compare your machine's physical measurements to the table to confirm the exact model designation before placing any parts order.
How do you fix boom cylinder seal kit part number is unclear, exploded view shows several sub-assemblies with no obvious seal group?
Turn to the boom cylinder exploded view. Each seal, O-ring, and wiper is listed individually with its own part number in the parts list. Confirm which catalog revision applies to your machine by checking the design change history on page 1, then order only the seal components shown for that specific edition.
Is this B12–B17 Series Parts Catalog a digital download?
Immediate download of the complete 144-page searchable Parts Catalog. 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 B12–B17 Series manual?
Yes, print as many copies as you want, and there are no restrictions. Many mechanics print the section they need and bring it to the shop floor.
Are electrical wiring diagrams included in this B12–B17 Series manual?
Yes, an electrical wiring diagram is included to help trace the main circuits.
Document Quality
This document is a scanned PDF with an accurate OCR text layer, allowing you to search and copy text. The scanned text is generally crisp and easy to read throughout. Diagrams and illustrations are clear raster images with readable labels, though they will pixelate if zoomed excessively. Pages are clean, free from stains, marks, or skewed content. Be aware that several pages consist solely of OCR text, which may appear as filler if you're expecting only visual content.
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