Part of the Yanmar Repair Manuals.
All 645 pages of this Yanmar B7-5 service manual PDF (OEM #0BKB4-G07500) cover the B7-5 and B7-5A mini excavators from engine to undercarriage. Inside: hydraulic circuit schematics for both variants with full circuit operation for boom, arm, bucket, swing, blade, and travel, plus complete wiring diagrams covering the monitor and alarm systems and starter circuit. You also get exploded views of every hydraulic component, step-by-step disassembly for the pump, control valve, pilot valve, swing motor, and travel motor, and a full troubleshooting section for machine, engine, and electrical faults. Swing bearing bolts torque to 195.3–224.2 ft•lbf (264.8–304.0 N•m); travel motor mounting bolts torque to 123.0–151.9 ft•lbf (166.7–205.9 N•m). No more digging through forum threads for numbers that may not even apply to your machine. One-click download, bookmarked by section, and searchable by keyword.
Complete the set for your B7-5, B7-5A
- Parts Catalog: Yanmar B7-5 Parts Catalog
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions for Maintenance Work | 12-25 | Correct Work, Safety Precautions, Preparations, Cautions for Disassembly and Reassembly, Cautions for Removal and Installation of Hydraulic Equipment |
| Technical Data | 26-43 | Specifications (Machine Body, Engine), Outline Drawing and Working Area (B7-5, B7-5A), Weight List of Main Parts, Lifting Capacity List |
| Service Standards | 44-69 | Machine Performance, Engine, Undercarriage (Rubber Crawler Specifications, Steel Crawler Specifications, Common Specifications of Steel & Rubber Crawlers), Controls |
| Engine | 70-243 | B7-5 (General, Troubleshooting, Adjustment, Engine Body, Lubrication System, Cooling System, Fuel Injection Pump / Governor, Starting Motor, Alternator, Special Service Tools) |
| Hydraulic System | 244-281 | Outline (Control Valve Operation, Additional Operation of Control Valve), Hydraulic Circuit Schematic (B7-5, B7-5A) |
| Hydraulic Equipment | 282-489 | Removal and Reinstallation of Hydraulic Pump, Removal and Reinstallation of Control Valve, Removal and Reinstallation of Swing Motor, Removal and Reinstallation of Swivel Joint |
| Adjustment and Repair | 490-595 | Electric Equipment of the Machine (Parts Layout of Electrical Equipment, Monitor and Alarm Systems, Wiring Diagram, Circuit Description of Engine Start, Stop and Battery Charging, Removal and Reinstallation of Engine, Removal and Reassembly of Starter Motor) |
| Periodic Inspection and Servicing | 596-599 | 8-1 List of Periodic Inspection and Servicing |
| Fuel, Lube Oil and Grease Recommended | 600-603 | Fuel, Engine Oil, Hydraulic Oil, Cooling Water, Grease, Antifreeze |
| Troubleshooting | 604-641 | 10-1 Non-Breakdowns, 10-2 Troubleshooting |
| Reference Data | 642-645 | 11-1 Specifications for Attachment, 11-2 Standard Bucket Specifications |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Swing bearing bolt tightening torque | 195.3 to 224.2 ft•lbf (264.8 to 304.0 N•m) | p. 64 |
| Travel motor to Track frame bolt tightening torque | 123.0 to 151.9 ft•lbf (166.7 to 205.9 N•m) | p. 64 |
| Air Release Procedure | 1. Air release of variable displacement piston pumps: 1) Put specified quantity of hydraulic oil into tank. 2) Keep oil supply cap removed. 3) Install air bleeder hose onto bleeder valve and loosen half a turn. 4) Check all air released. 5) Tighten bleeder valve. 2. Air release of each hydraulic component: Run engine at medium speed and activate circuits for 10 to 15 minutes. 3. Air release of hydraulic cylinders: 1) Set engine speed at low idling. 2) Extend and retract cylinder up to 2 to 4 in. (50 to 100 mm) from each stroke end slowly 4 or 5 times. 3) Then, fully extend and retract the cylinder 3 or 4 times. | p. 22 |
| Piston assembly - Clearance (Standard dimension) | 0.002 in. (0.04 mm) | p. 48 |
| Pilot valve handle mounting nut tightening torque (Loctite 262) | 22 ft lbf (30 N·m) | p. 373 |
| Return filter - Filtration accuracy | 10 μ | p. 29 |
| Overall length (Transportation position) | 227.56 in. | p. 26 |
| Minimum ground clearance | 14.96 in. | p. 26 |
| Maximum digging force Bucket | 12326.0 lbs | p. 27 |
| Hydraulic oil tank Tank capacity | 26.4 Gals | p. 29 |
| Engine Rated output | 55.2 HP | p. 31 |
