Need the factory part numbers for your 1987-1990 Yanmar crawler backhoe? This 161-page Yanmar B22 Parts Catalog (OEM #000Y00K2282) covers the complete model family: YB221U, YB221UZ, B22, B22-1, and all P, C, and Z variants. You get exploded-view diagrams across every major system: engine, chassis, cab, hydraulic assemblies, and boom components, each tied to OEM part numbers so your order lands right the first time. Wiring coverage is split by configuration, with separate diagrams for canopy-spec and cabin-spec machines that identify the battery, fuel system, accelerator linkage, and air cleaner as individual replaceable assemblies. For a machine pushing 35 years, the right part number is the only thing standing between you and two weeks waiting on the wrong seal. Bookmarked by section; jump to hydraulics, boom parts, or engine components by keyword and place your order.
What's Inside This Yanmar YB221U / B22 Series Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Preface | 1 | YB221U, YB221UZ, B22, B22-1 Model Variants, Part Catalog History, Model Name Index |
| Specifications | 2 | Engine Type, Transport Dimensions, Bucket Capacity, Working Range, Performance Data, Machine Mass |
| Table of Painted Color | 3-4 | Painted Color List, Canopy Color, Cabin Color |
| Pictorial Index | 5-12 | Main Parts Overview, Hydraulic Section Index, Figure Index, Assembly Layout |
| Wiring Diagram | 13-15 | Electrical Schematic, Wiring Harness Routing, Circuit Overview |
| Body & Engine Parts | 16-39 | Label Sets (canopy/cabin), Tools, Air Cleaner, Silencer, Accelerator, Engine Mount, Radiator, Fuel Tank, Fuel Pipe, Battery, Electric Parts, Work Lamp |
| Undercarriage | 38-55 | Track Roller (previous/new), Track Frame, Idler, Crawler 270mm, Link Stand |
| Control Equipment & Frame | 54-75 | Control Levers, Control Links, Multi-Link Spec, Control Rods, Turning Frame, Turning Driving Gears, Bonnet, Seat, Step, Canopy, Cabin |
| Hydraulic System | 77-120 | Boom Cylinder, Arm Cylinder, Bucket Cylinder, Swing Cylinder, Blade Cylinder, Hydraulic Oil Pump, Turning Motor, Travel Motor, Swivel Joint, Control Valves (travel/turning/arm/bucket/swing/boom/blade), Hydraulic Oil Tank, Greasing, Hydraulic Oil Piping |
| Boom, Arm & Attachments | 121-128 | Boom Assembly, Boom Bracket, Arm, Bucket Link, Bucket, Blade |
| Optional & Attachment Parts | 129-155 | Cigar Lighter, Manual Case, Heater, Defroster, Radio, Crawler 320/350 Optional, 3rd Valve Control, 3rd Valve Piping, D-Pattern Link, Blade 850 Attachment, Bucket Attachments, Bucket S-Type |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
Yanmar YB221U / B22 Series Common Problems This Manual Covers
Need the exact wiring harness part number for Yanmar YB221U because machine won't start p. 13
Check the electrical system exploded view on page 13. Locate the main wiring harness and cross-reference the part number with the list. Verify the machine mass in kilograms on page 2 to confirm your exact chassis variant before ordering the replacement harness assembly.
Manual Section: Wiring DiagramCannot locate the correct seal kit part numbers because turning motor leaks hydraulic fluid
Inspect the hydraulic parts diagram. Find the turning motor assembly and identify the individual seal and O-ring part numbers. Cross-reference these numbers with the bucket capacity in cubic meters on page 2 to ensure correct variant compatibility for your specific crawler backhoe.
Manual Section: Hydraulic System ComponentsNeed the replacement cylinder assembly part numbers because boom cylinder rod is scored
Review the boom and attachment parts diagram. Identify the complete boom cylinder assembly and record the required part numbers. Check the transport dimensions in millimeters on page 2 to confirm you are viewing the correct equipment configuration before purchasing the new cylinder.
Manual Section: Wiring DiagramNeed to order a new radiator and mounting bracket parts because engine runs hot
Inspect the engine parts diagram. Locate the radiator assembly, mounting brackets, and associated hardware part numbers. Compare your machine's performance specifications in km/h on page 2 to verify you select the exact cooling system components for your specific model variant.
Manual Section: Wiring DiagramFrequently Asked Questions
What are the wiring harness part numbers for the YB221U?
The main wiring harnesses are: HARNESS(A) WIRE part# 172141-16510 (updated to 172142-16500 from 1987.11), HARNESS(B) WIRE part# 172141-16520 (updated to 172141-16521 from 1987.11), HARNESS(D) WIRE part# 172141-16540, HARNESS(E) WIRE part# 172141-16550, and EARTH WIRE part# 933171-15801. See page 31 Battery section.
What seal kit is needed for the YB221U turning motor?
The turning motor (Turning Motor section, pages 93-94) uses seal components listed under the hydraulic system. The turning motor assembly and associated seal parts are covered in the Control Valve and Turning Motor exploded-view diagrams. Cross-reference the Turning Motor section (p.93) for seal ring and O-ring part numbers specific to the YB221U/B22 turning motor.
What are the boom cylinder assembly part numbers for the YB221U / B22?
The boom cylinder parts are split by cab type: Boom Cylinder (Cabin) is on pages 77-78, and Boom Cylinder (Canopy) is on pages 79-80. Each section provides the full exploded view with cylinder body, piston, seal, and mounting hardware part numbers for both YB221U and B22 variants.
What hydraulic parts are covered in this YB221U parts catalog?
The catalog covers the complete hydraulic system: boom, arm, bucket, swing, and blade cylinders; hydraulic oil pump and joint; turning motor; travel motor; swivel joint; control valves for travel, turning, arm, bucket, swing, boom, and blade; hydraulic oil tank; greasing points; and all hydraulic oil piping (valve-to-swivel-to-motor, tank-to-valve, travel, and equipment circuits). OEM part# 000Y00K2282 covers models YB221U, YB221UZ, B22, and B22-1, 1987-1990.
Document Quality
This document is a scanned PDF, not a native digital file. You can search the full text of the document, as an OCR layer has been applied, and the text is generally crisp and easy to read. Diagrams and illustrations are raster images, meaning they may pixelate slightly at high zoom levels, but all labels within them remain clearly readable. The pages are clean with no notable scan artifacts, stains, marks, or skewed content.
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