All 204 pages of this Yanmar B50-P(R), B50-O(R), and B50-C(R) Crawler Backhoe Parts Catalog (OEM #Y00K2511-1) are built around one job: putting the correct OEM part number in your hand before you spend an hour on hold with a dealer. Inside, exploded views walk through every major system, from cab assembly and engine mounts to control valves, travel motor internals, and boom cylinder components, with a wiring diagram covering the full electrical system. Part numbers run through every section: track roller O-rings, pilot valve shims, hydraulic piping connectors, bucket teeth assemblies, and everything between. The model chart confirms your B50-O(R) reaches 5100 mm cutting depth and 3550 mm dumping height, so you're ordering parts matched to the right variant. Wrong part number, two-week wait. Bookmarked and keyword-searchable; pull up the section you need and have the OEM number ready before you call the counter.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Max. cutting depth | 5100 mm | p. 1 |
| Max. dumping height | 3550 mm | p. 1 |
Yanmar B50-P(R) / O(R) / C(R) Series Common Problems This Manual Covers
Yanmar B50-O(R) major hydraulic leak at the main lift arm, need the boom cylinder seal kit part number p. 89
Check the Boom Cylinder exploded view on page 89. Locate the correct seal kit for your specific serial number. Verify your machine reaches the max dumping height of 3550 mm to confirm you have the B50-O(R) configuration before ordering replacement seals.
Manual Section: Boom CylinderEngine fires up but sputters and dies, cannot locate the correct replacement fuel filter and tank strainer p. 22
Inspect the Fuel Tank & Fuel Line breakdown on page 22. Identify the exact fuel strainer and inlet hose part numbers. If you operate the B50-O(R) variant with the 5100 mm max cutting depth, cross-reference the specific tank cap and gauge components for your exact model.
Manual Section: Fuel Tank & Fuel LineTracks barely move while other functions operate normally, needing diagram for travel motor internal rotary set p. 108
Review the Travel Motor drivetrain parts diagram on page 108. Find the correct case set, piston, and retainer part numbers for your unit. Match the rotary set components carefully, especially if your machine is the B50-O(R) capable of the 3550 mm max dumping height.
Manual Section: Travel MotorExcessive wear and squealing at the bucket linkage, missing the correct grease nipple part numbers p. 180
Examine the Arm & Bucket Link parts list on page 180. Locate the replacement Nipple PT1/8 and corresponding shim sets. Order the exact pin assembly and side cutter hardware to restore tight linkage tolerances when digging to the 5100 mm max cutting depth.
Manual Section: Arm & Bucket LinkSevere engine vibration and rattling from the engine room, broken support brackets and missing hardware p. 19
Check the Engine Mount parts diagram on page 19. Identify the correct shock absorbers, stopper brackets, and Bolt M 12X 25 hardware. Order the precise support assembly to secure the engine block and prevent alignment issues with the radiator and oil cooler.
Manual Section: Engine MountFrequently Asked Questions
What is the part number for the boom cylinder seal kit on the Yanmar B50?
The Boom Cylinder section on page 89 lists seal components including SEAL 50X60X4 DUST (part 172165-81760). Check the exploded view on pages 89-94 for the full seal kit applicable to your B50-P(R), B50-O(R), or B50-C(R) serial range.
Where can I find replacement hydraulic hose part numbers for the Yanmar B50?
The Hyd. Oil Piping section on pages 146-165 lists all hydraulic hoses. HOSE 172151-78410 appears on page 147; HOSE G208AB100W (part 172124-78400) appears on page 158. Both are OEM Yanmar parts for the B50 crawler backhoe.
What track roller and undercarriage parts are covered in the Yanmar B50 parts catalog?
Pages 38-39 cover Track Roller and Carrier Roller components including Sprocket, Roller Assy, Bush, Shaft, Circlip, and O-Ring. Pages 40-41 cover Track Frame and Idler with Front Idler, Bush, Shaft, Idler Assy, Adjust Cylinder, and Frame parts.
Does the Yanmar B50 parts catalog include wiring diagrams and electrical part numbers?
Yes. Pages 26-31 cover the Electric Part section with Harness, Wire, Battery, Fuse, Switch, and Lamp components. A wiring diagram with wire color codes is included on page 3.
Document Quality
This PDF is a scanned document, not a native digital file. It includes an OCR layer, so you can search and copy text throughout the document, though the text quality is generally readable but not perfectly crisp. All diagrams and illustrations are raster images, meaning they may pixelate when zoomed in, but labels are mostly readable at reasonable magnifications. Pages are clean with no notable scan artifacts, stains, or skewed content.
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