Tracking down replacement components for your Yanmar B08 Crawler Backhoe (including G, Y, EX, AY, and 3TN66 engine variants) is simple with this 145-page parts catalog (OEM #Y00K2693). Inside this Yanmar B08 parts catalog PDF, you get incredibly detailed exploded views covering everything from the track frame to the boom cylinder. Expect complete factory parts lists with exact cross-reference numbers for the undercarriage, control valves, and electrical harness, plus full wiring diagrams to identify every fusible link and relay. Verify your crawler's exact geometry with factory dimensions like the left 50 and right 90-degree boom swing angles before ordering new bucket links. Stop ordering the wrong pins and bushings. Grab this bookmarked download, pull it up on your phone in the parts room, and get exactly what your machine needs.
What's Inside This Yanmar B08 Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Preface | 1 | Parts Catalog History |
| Specifications | 2-3 | Name, Model, Engine, Dimensions, Std. Bucket Capacity, Max. Digging Depth |
| Vehicle Painted Color | 4-5 | Paint Part No |
| Wiring Diagram | 6 | Starter Switch, Battery, Generator, Regulator, Fusible Link, Horn |
| Labels | 15-27 | Label (Jp), Label (Ex), Label (Ay), Safety Label (Jp), Safety Label (Ex), Safety Label (Ay) |
| Tools & Engine Components | 28-39 | Tool, Suc. Pipe & Exh. Pipe, Accelerator, Engine Mount, Radiator & Mount, Fuel Tank & Fuel Line |
| Electrical Components | 40-44 | Battery, Harness, Fuse, Lamp, Hour Meter, Relay |
| Undercarriage & Control Equipment | 45-59 | Roller, Idler & Crawler, Idler & Crawler (Lotus Root Spec.), Control Equipment (Link Stand & Stopper), Control Equipment (Operation), Control Equipment (Drive & Swing) |
| Frame & Body | 60-74 | Track Frame (Fix Leg Spec.), Track Frame (Lotus Root Spec.), Track Frame (Widen/Shorten Variable Leg : 1/2), Track Frame (Widen/Shorten Variable Leg : 2/2), Turning Frame |
| Hydraulic Cylinders | 75-86 | Hyd. Oil Pump & Joint, Boom Cylinder, Arm Cylinder, Bucket Cylinder, Swing Cylinder, Blade Cylinder |
| Motors & Swivel Joint | 87-96 | Widen/Shorten Cylinder, Driving Motor, Turning Motor, Hyd. Oil Tank, Swivel Joint |
| Control Valves | 97-108 | Control Valve (Pump Port), Control Valve (Driving & Turning), Control Valve (Swing & Boom), Control Valve (Arm & Bucket), Control Valve (Blade & P.T.O.) |
| Hydraulic Piping | 109-130 | Hyd. Oil Piping (Tank - Pump - Valve), Hyd. Oil Piping (Turning Frame : Fix Leg Spec.), Hyd. Oil Piping (Turning Frame : Widen/Shorten Variable Leg Spec.), Hyd. Oil Piping (Return) |
| Greasing | 131-132 | - |
| Attachments | 133-145 | Boom & Boom Bracket, Arm & Bucket Link, Bucket, Bucket (Lotus Root Spec.), Blade |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Boom swing angle | Left 50 · Right 90 degree | p. 2 |
Yanmar B08 Common Problems This Manual Covers
Yanmar B08 hydraulic boom cylinder leaking fluid down the arm, bucket won't lift p. 75
Check the boom cylinder exploded view in the Hydraulic Cylinders section on page 75. Identify the exact seal kit part number for your specific serial number. Verify the boom swing angle configuration matches the Left 50 · Right 90 degree specification on page 2 before ordering replacement components.
Manual Section: Hydraulic CylindersUndercarriage tracking poorly with excessive vibration and grinding noise from the lower track frame p. 46
Inspect the Drivetrain Parts Diagram on page 46. Locate the exploded parts list for the roller, idler, and crawler assemblies. Verify your machine's boom swing angle matches the Left 50 · Right 90 degree specification on page 2 before ordering new track frame components to guarantee factory fitment.
Manual Section: Undercarriage & Control EquipmentErratic joystick response and weak hydraulic pressure at the swing motor when rotating the cab p. 97
Review the Control Valve (Swing & Boom) breakdown on page 97. Find the exact spool and seal part numbers in the parts list. Confirm your machine's boom swing angle matches the Left 50 · Right 90 degree specification on page 2 to ensure you order the correct valve assembly.
Manual Section: Control ValvesFrequently Asked Questions
What are the replacement specifications for hydraulic hoses?
The manual lists various hydraulic hoses with their specific part numbers and quantities. For instance, a "HOSE" with part number 172157-78371 is specified with a quantity of 1,1,1,1 for the Hyd. Oil Piping (Tank - Pump - Valve) section. Another example is "HOSE P202FF073W" with part number 172453-78100, quantity 2, for the Hyd. Oil Piping (Driving Frame : Fix Leg Spec.) section.
What is the part number for the Yanmar B08 air cleaner element?
The air cleaner element for the Yanmar B08 is listed as part number 121465-12510 (qty 1 per machine), found in the Tools & Engine Components section on page 30. This part applies across all B08 variants (G, Y, EX, AY). Use the exploded diagram on page 30 to confirm the exact position before ordering.
Where is the wiring diagram in the Yanmar B08 parts catalog?
The wiring diagram is on page 6 of this parts catalog, covering the full circuit: starter switch, battery, generator, regulator, fusible link, and horn. The Electrical Components section (pages 40-44) lists part numbers for the battery, wire harness, fuse, lamp, hour meter, and relay for all B08 variants.
What undercarriage parts are covered in the Yanmar B08 parts catalog?
Undercarriage and crawler parts occupy pages 45-59: rollers, idlers, and crawler assemblies in standard and Lotus Root specs, plus drive and swing control equipment. The variable-leg track frame (widen/shorten) is covered separately in the Frame & Body section (pages 60-74).
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