Part of the Yanmar Repair Manuals.
All 533 pages of this Yanmar B50-2 service manual PDF are built around one machine family: the B50-2 and B50-2A compact excavators, with factory-level coverage from engine block to hydraulic circuit to electrical panel. You get a complete hydraulic system section covering pump teardown, control valve service, swing motor, travel motor, and full circuit schematics for every attachment circuit, boom through dozer. Inside: a full troubleshooting section spanning machine, engine, and electrical panel faults, plus wiring diagrams and page after page of tightening torque tables backed by exploded views. Set cylinder head bolt torque to 8.7 kgf-m on the M10x1.5 fasteners, then torque swing bearing M16 bolts to 27-31 kgf-m with Loctite 262 applied. Your machine is down. Search any spec by keyword, jump straight to the section you need, and get the right answer on the first try.
Complete the set for your B50-2, B50-2A
- Parts Catalog: Yanmar B50-2 Parts Catalog (incl. Wiring)
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 12-22 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Attaching and Detaching Hydraulic Equipment |
| Technical Data | 24-36 | Specifications, External Drawings and Working Ranges (Canopy Type Specifications, Cabin Type Specifications), Weight of Main Parts, Lifting Capacities |
| Servicing Standards | 38-56 | Machine Performance, Undercarriage (Rubber Track Specifications, Steel Track Specifications, Steel & Rubber Track Common Specifications), Control Devices |
| Engine | 58-183 | Cylinder Block, Cylinder Head, Piston and Piston Pin, Connecting Rod, Crankshaft and Main Bearing, Camshaft and Tappets, Timing Gear, Service Data |
| Hydraulic System | 184-413 | Outline, Circuit Schematic, Hydraulic Pump, Control Valve, Pilot Valve, Swing Motor, Travel Motor, Pressure Adjustment |
| Adjustment Procedures for Each Equipment | 414-477 | Electrical Equipment of the Machine (Arrangement of Electrical Equipment and Names of Parts, Monitor and Alarm Systems) |
| Periodic Inspection and Servicing | 478-481 | List of Periodic Inspection and Servicing |
| Fuel, Lube Oil and Grease Recommended | 482-484 | Fuel Specifications, Lube Oil Specifications, Grease Specifications, Cooling Water |
| Troubleshooting | 486-523 | Non-Breakdowns, Machine & Engine, Electrical Equipment on Panel |
| Reference Data | 524-533 | Steel Track Exchange, Rubber Track Exchange |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic hose length change at high pressure | +2% to -4% | p. 17 |
| Swing bearing to lower frame tightening torque | 27 ~ 31 kgf-m | p. 54 |
| Swing bearing to turning frame tightening torque | 27 ~ 31 kgf-m | p. 54 |
| Cylinder head bolt torque (M10x1.5) | 8.7 kgf-m | p. 56 |
