Part of the Yanmar Parts Manuals.
Searching for a factory part number on your Yanmar YB401 crawler-backhoe? This 188-page parts catalog covers the YB401, with exploded assembly views across every major system. Open it to full hydraulic piping breakdowns, wiring harness diagrams, control valve spool section IDs, and complete boom, arm, and bucket assembly drawings, plus dedicated sections for optional equipment: heater/defroster, radio, windshield washer, and B-type control kit. The traveling motor entry breaks down to the piston motor, individual seal set, turning brake valve, and planetary gear, each tagged with its own OEM part number. Chasing a part while the dealer clock runs? Pull up the PDF on your phone, read the exact OEM number off the exploded view, and order the right piece the first time. Bookmarked by system; jump straight to hydraulics, drivetrain, or cab without scrolling.
What's Inside This Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Fuel System | Fuel Tank & Fuel Line | |
| Cooling System | Radiator & Mount | |
| Engine | Engine Control, Hydraulic Oil Pump & Coupling | |
| Electrical System | Battery & Clamp, Wiring, Electric Parts, Work Lamp | |
| Undercarriage & Travel | Idler & Crawler Adjuster, Traveling Motor | |
| Hydraulics & 3-Point Hitch | Cylinder Protector, Bucket Cylinder, Blade Cylinder, Arm Cylinder, Swing Cylinder, Boom Cylinder, Control Valve, Hydraulic Oil Tank, Hyd. Oil Piping | |
| Loader, Backhoe & Attachments | Boom & Arm, Bucket, Blade | |
| Body & Operator Station | Seat, Bonnet, Canopy, Cabin, Front Open Cabin, Front Flat Cabin, Track Frame & Track Guard, Step & Turning Lock, Windshield Washer, Radio, Heater & Defroster | |
| Decals & Accessories | Labels, Tools, Tools Box, Greasing | |
| Other Components | Eng. Mount, Link Stand, Btype Control Equipment, Lift Pin |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Yanmar YB401 Crawler Backhoe (YB401, YB401-2, YB401-UC, YB401-UZP) | ||
| Parts Catalog | ||
| 188 | ||
| Y00K2040 | ||
| Hydraulic Filter Strainer (172112-74801), Boom Cylinder Seal (p.68), Hydraulic Oil Piping (p.86) |
