Part of the Yanmar Repair Manuals.
Seven hundred twenty-two pages of Yanmar B7-6 factory data: that's what this OEM manual puts in your hands, covering the complete compact excavator from engine internals through final drive. This Yanmar B7-6 service manual PDF gives you hydraulic circuit schematics tracing every pilot valve, swing motor, and travel motor loop, plus full machine wiring diagrams covering the Hydraulic ECU, LCD monitor alarms, and DPF electronic control system. Open it to a complete error code section, exploded views of every major assembly, and torque tables spanning machine fasteners, engine hardware, and hydraulic fittings. Torque the travel motor-to-track frame fasteners to 264.8–304.0 N·m (195.3–217 ft·lbf), then verify your hydraulic hoses are rated for 17.2–20.6 MPa before pressurizing the system. Your excavator is down and every hour costs real money. Pull it up on your tablet, search by keyword, and get the factory answer on the first try; bookmarks put you in the right section instantly.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 13-24 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 25-52 | 2-1 Specifications, 2-2 Outline Drawing and Working Area, 2-3 Weight List of Main Parts, 2-4 Lifting Capacity List, 2-5 Specifications for Attachment |
| Service Standards | 53-82 | Machine Performance, Engine, Undercarriage (Rubber Crawler Specifications, Steel Crawler Specifications, Common Specifications of Steel & Rubber Crawlers), Controls |
| Engine | 83-240 | 4-1 Safety, 4-2 Engine, 4-3 Fuel System, 4-4 Cooling System, 4-5 Lubrication System, 4-6 Starter Motor, 4-7 Alternator, 4-8 Electronic Control System |
| Electric System | 241-292 | Electric Equipment of Machine (Parts Layout of Electrical Equipment, LCD Monitor and Alarm Systems), Circuit Description of Engine Start and Stop |
| Hydraulic System | 293-564 | Outline (Control Valve Operation, Additional Operation of Control Valve) |
| Adjustment and Repair | 565-710 | Engine and Electric Equipment (Removal Reinstallation: Starter Motor, Radiator and Oil Cooler, Fan Belt and Compressor Driving Belt, Engine ECU, Hydraulic ECU, Diesel Particulate Filter) |
| Troubleshooting | 711-722 | Non-Breakdowns (Natural Release of Bucket, Discontinuous Arm Movement, Thermal Shock of Travel Motor, Elongation of Boom Swing Cylinder on 60 Degrees Swing, Time Lag on Travel Speed Switching, Fluctuation in Oil Level of Hydraulic Oil Tank Due to Temperature Change) |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Travel motor × Track frame tightening torque | 195.3 to 217 ft•lbf (264.8 to 304.0 N•m) | p. 70 |
| Hydraulic air release procedure | 1. Air Release of Variable Displacement Piston Pumps (run engine at low idling, check oil level). 2. Air Release of Each Hydraulic Component (run engine at medium speed, activate circuits). 3. Air Release of Hydraulic Cylinders (extend/retract cylinder slowly, then fully). | p. 20 |
| Hydraulic hose working pressure (code 2) | 2489 to 2986 PSI (17.2 to 20.6 MPa) | p. 18 |
| Hydraulic hose nominal diameter (code 06) | 3/8 inch | p. 18 |
| Hydraulic cylinder O-ring (Boom cylinder 7-1) standard | Ø2.76 (Ø70) in. (mm) | p. 66 |
| Cooling water hose clip 48 tightening torque | 1.8 to 2.5 ft•lbf (2.5 to 3.4 N•m) | p. 69 |
| Rubberized fuel hoses replacement interval | Every two years or every 2000 hours, whichever comes first | p. 85 |
| Air cleaner intake hose (Engine and Air cleaner side) hose clip 80 tightening torque | 1.8 to 2.5 ft•lbf (2.5 to 3.4 N•m) | p. 69 |
| Hose clip 13 (Drain) tightening torque | 1.6 to 1.8 ft•lbf (2.16 to 2.45 N•m) | p. 71 |
| Water temperature alarm switch operating temperature | 224.6 to 235.4 °F (107 to 113 °C) | p. 30 |
| Oil pressure alarm switch operating pressure | 5.69 to 8.53 PSI (0.04 to 0.06 MPa) | p. 30 |
| Blade fuse ratings | 30 × 3, 20 × 5, 10 × 3, 5 × 7 A×pcs. | p. 31 |
