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 Yanmar B7-6 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 |
Yanmar B7-6 Common Problems This Manual Covers
Yanmar B7-6 hydraulic functions slow or weak under load after machine warms up p. 26
Retract all cylinders fully, then check the hydraulic tank sight glass; the 15.8-gallon (60 L) tank requires ISO VG46 oil near the upper mark. Verify system relief pressure reaches 3698 PSI (25.5 MPa) per page 26. If fluid level is correct and pressure reads low, pull and inspect the return filter, rated at 10 microns.
Manual Section: Hydraulic SystemHydraulic system cavitates, makes abnormal noise, or jerks erratically after service work p. 20
Follow the three-step air release procedure on page 20: run the engine at low idle to bleed the variable displacement pumps, step up to medium speed to cycle each circuit, then slowly extend and retract each cylinder fully. Confirm all G 3/8 parallel thread fittings are torqued to 32.5 to 39.8 ft·lbf (44.1 to 53.9 N·m) per page 74.
Manual Section: General Cautions for Maintenance WorkCoolant hoses feel soft or show surface cracks, clamps loose on walk-around inspection p. 69
Tug-test every coolant hose for soft spots, cracking, or collapse; the radiator holds 9.10 Qts. (8.6 L) and a split hose loses it fast. Retorque cooling water hose clips to 1.8 to 2.5 ft·lbf (2.5 to 3.4 N·m) per page 69. Replace all rubberized hoses at 2,000 hours or two years, whichever comes first.
Manual Section: EngineOperator panel, warning lights, or monitor display acts intermittently or goes dark at startup p. 31
Check the fuse box first; blade fuses run 5A through 30A and slow-blow fuses range from 60A to 120A per page 31. Cross-reference fuse box positions on page 44 to isolate the dead circuit. Inspect all harness connectors for corrosion, then verify alternator output against the 80 A nominal spec on page 45 before pulling the wiring harness.
Manual Section: Electric SystemEngine cranks slowly or refuses to fire on cold mornings, glow plugs suspected p. 30
Measure compression against the 493 PSI (3.4 MPa) minimum at 250 rpm on page 30; worn rings or valves will surface here before anything else. Confirm alternator output is near 80 A per page 45 to verify the battery gets a full overnight charge. If compression is good, inspect the fuel system and check injector spray pattern.
Manual Section: EngineFrequently Asked Questions
What do the error codes on a Yanmar B7-6 excavator mean?
The error codes on a Yanmar B7-6 excavator indicate specific abnormalities detected by the LCD monitor or controllers. Each code corresponds to a detailed description of the malfunction, its detection conditions, probable causes, and recommended corrective measures, which are listed in the "Error Code List" starting on page 277. For example, code "00 000051.03" indicates a high voltage malfunction of the intake throttle position sensor.
What are the torque specs for Yanmar B7-6 track tensioner bolts?
The tightening torque for the track adjust spring installation bolt (M14) is 86.8 to 108.5 ft•lbf (118 to 147 N•m), and Loctite 262 or its equivalent should be applied. For the sprocket bolts (M14 × 35), the tightening torque is 137.2 to 151.9 ft•lbf (186 to 206 N•m), also requiring Loctite 262 or K-965.
What is the procedure to reset the ECU or controller on a Yanmar B7-6?
The manual does not describe a general "reset" procedure for the ECU or controller. Instead, specific recalibration or data transfer procedures are required when replacing the ECU or certain components. For instance, after ECU replacement, DPF regeneration procedures are necessary, which involve starting and warming up the engine to 60 °C or higher and performing recovery or stationary regeneration cycles. The SMARTASSIST-Direct (SA-D) diagnostic tool is often used for clearing error information and canceling backup modes.
How to reset error codes on Yanmar B7-6
Error codes on the Yanmar B7-6 can be reset or cleared from the "Defect History" using the SMARTASSIST DIRECT (SA-D) diagnostic tool. This involves connecting the SA-D tool, navigating to "Diagnostic Codes" and "Defect History", and then pressing the "All Clear" button.
How quickly can I access this manual after buying?
Instant PDF download. You get the full 722-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Am I able to print pages from this Service Manual?
There are no print restrictions. The PDF is DRM-free — print whatever sections you need for the shop. Standard letter or A4 paper works.
Are hydraulic system diagrams in this Yanmar B7-6 Service Manual?
Included. Hydraulic system schematics cover all circuits, control valves, and component specifications for the Yanmar B7-6.
Reviews
There are no reviews yet.