Part of the Yanmar Parts Manuals.
Ten minutes after checkout you can have the exploded view of the B25V-1 idler assembly open on your phone, matching the seal and collar on your bench to a numbered callout instead of squinting at a worn casting. That is what this 13-page Yanmar parts catalog (publication 000Y00S3680) is for: the B25V-1 crawler backhoe, built around the 3TNE78A - B1A engine, reference B6040.
It is organized into five sections: Roller & Adjust, Crawler, Hyd. Oil Pump & Joint, and two Control Valve chapters that break the valve bank down into bucket, boom, arm, swing, blade, drive, turning and P.T.O. sections, with the relief valve settings printed alongside.
Guessing at part numbers on a machine this age is expensive: a mis-ordered coupling, a week of downtime, a second teardown to fit the right seal. This catalog gets you the correct number the first time.
What's Inside This Parts Manual
| System | Pages | Key Topics |
|---|---|---|
| Roller & Adjust | 3-4 | Sprocket, Idler Assembly, Mechanism, Track Roller Assembly, Carrier Roller Assembly |
| Crawler | 5-6 | Rubber Component |
| Hyd. Oil Pump & Joint | 7-8 | Hydraulic Oil Pump Assembly, Coupling, Valve Block Assembly, Gear Pump |
| Control Valve (1/2) | 9-10 | T1-Port Components, Bucket Section, Boom Section, Drive Section, P1, P2-Port Components |
| Control Valve (2/2) | 11-13 | Arm Section, P.T.O. Section, T2-Port Components, Turning Section, Blade Section, Control Section, Swing Section |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Relief Valve Setting (Boom/Bucket) | 210/20 | p. 8 |
| Relief Valve Setting (Swing) | 185/31 | p. 8 |
| Relief Valve Setting (Arm) | 220/20 | p. 10 |
| Idler Size | 289 | p. 2 |
| Seal Dimensions | 45x85x8.5x19 | p. 2 |
| Circlip Size | 30 | p. 2 |
| O-Ring 1B Size | P-14.0 | p. 2 |
| Packing G Size | 35.0 | p. 2 |
| Bearing Type | #6205 | p. 2 |
