All 135 pages of this Yanmar B08-3 Parts Catalog (OEM #Y00S4171) are built around one job: identifying and ordering the right parts for your 2001-2004 B08-3 Crawler Back-hoe, including both the US and AS variants. Inside, you get fully itemized parts lists for every major assembly: engine mount, fuel tank, radiator, boom and arm cylinders, hydraulic oil pump, control valve, travel motor, swivel joint, crawler and idler. Each entry carries Yanmar reference numbers, interchangeability marks, and effective machine serial ranges so you know exactly which part fits your serial number. Need the swivel O-ring? That's 55.76mm ID, 5.7mm thickness. Control lever O-ring: 27mm ID, 5.7mm thickness. Factory numbers, pulled straight from the catalog. Stop guessing part numbers off worn-out tags. Bookmarked by assembly, this PDF lets you jump to the system you're working on, confirm the part number, and order with confidence.
What's Inside This Yanmar B08-3, B08-3 (US), B08-3 (AS), 2TNE68-EBVA Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Preface | 1 | Parts Catalog History, Model Name, Maintenance Servicing, Yanmar Genuine Parts |
| Vehicle Painted Color | 3 | Color Code, Painted Color, Munsell No., Paint Part No., Yanmar New Permanent Yellow, Yanmar Red |
| Wiring Diagram | 4 | Horn Lamp, Buzzer, Current Limitor, Safety Relay, Glow Register, Starting Switch |
| Electric Part (Wiring) | 35 | Cab Warning Lamp 12V 3.4W, Horn Lamp, Buzzer, Safety Relay, Glow Register, Starting Switch |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Bulb Voltage and Wattage | 12V, 3.4W | p. 35 |
| Fuse Rating | 40A | p. 35 |
| Valve Voltage and Wattage | 12V, 27W | p. 35 |
| Control Lever O-Ring Size | 27mm ID, 5.7mm thickness | p. 53 |
| Swivel O-Ring Size | 55.76mm ID, 5.7mm thickness | p. 91 |
Yanmar B08-3, B08-3 (US), B08-3 (AS), 2TNE68-EBVA Common Problems This Manual Covers
Yanmar B08-3 cab warning lamp failure or dim instrument cluster lighting p. 35
Check the electrical component breakdown on page 35 to locate the correct replacement part number. Verify you are ordering the proper 12V, 3.4W bulb for the cab warning lamp. Cross-reference the horn lamp and buzzer connections using the wiring diagram on page 4 to ensure correct fitment.
Manual Section: Wiring DiagramSluggish implement response and visible hydraulic fluid weeping around the main control levers p. 53
Review the parts breakdown on page 53 to find the correct replacement components. Identify the exact part number for the control lever O-ring, which measures 27mm ID by 5.7mm thickness. Order the proper quantity of seals and cross-reference the adjoining hydraulic components to complete the rebuild.
Manual Section: Control Valve ReplacementMachine tracks unevenly and loses travel drive power on one side p. 91
Examine the swivel joint assembly exploded view on page 91 to locate the required replacement part numbers. Ensure you select the correct swivel O-ring measuring 55.76mm ID by 5.7mm thickness. Cross-reference the chassis part numbers to stop internal cross-port leakage in the travel circuit.
Manual Section: Hydraulic Oil Piping ReplacementExcessive undercarriage vibration and blown electrical travel alarm circuits
Inspect the chassis parts diagram to identify replacement part numbers for worn sprockets and track rollers. Match your specific machine serial number in the parts list. Replace any damaged 40A main fuses protecting the travel circuit by checking the electrical parts on page 35.
Manual Section: Sprocket & Roller ReplacementFrequently Asked Questions
How do you replace a failed cab warning lamp or dim instrument cluster light on the Yanmar B08-3?
Check the electrical component breakdown on page 35 to locate the correct replacement part number. Verify you are ordering the proper 12V, 3.4W bulb for the cab warning lamp. Cross-reference the horn lamp and buzzer connections using the wiring diagram on page 4 to ensure correct fitment.
How do you fix sluggish implement response and hydraulic fluid weeping around the main control levers?
Review the parts breakdown on page 53 to find the correct replacement components. Identify the exact part number for the control lever O-ring, which measures 27mm ID by 5.7mm thickness. Order the proper quantity of seals and cross-reference the adjoining hydraulic components to complete the rebuild.
How do you fix uneven tracking and loss of travel drive power on one side of the Yanmar B08-3?
Examine the swivel joint assembly exploded view on page 91 to locate the required replacement part numbers. Ensure you select the correct swivel O-ring measuring 55.76mm ID by 5.7mm thickness. Cross-reference the chassis part numbers to stop internal cross-port leakage in the travel circuit.
What fuse and undercarriage parts should you inspect when the travel alarm circuit blows or tracks vibrate excessively?
Inspect the chassis parts diagram to identify replacement part numbers for worn sprockets and track rollers. Match your specific machine serial number in the parts list. Replace any damaged 40A main fuses protecting the travel circuit by checking the electrical parts on page 35.
Document Quality
This document is a mixed-format PDF, featuring both native digital content and scanned pages with an OCR text layer. You can search and copy text throughout the entire document, and the text quality is consistently crisp and easy to read. All diagrams and illustrations are vector-based, ensuring they remain sharp at any zoom level with clearly readable labels. Pages are clean, free from scan artifacts, stains, or skewed content. There are no notable blank or filler pages.
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