Kubota B6000 / B6000E Tractor 1970–1980 Service Manual & Parts Guide (P/N 70000-70168)

This official 52-page OEM publication (Part No. 70000-70168) in PDF format delivers the exact dimensional data and assembly specifications required for servicing vintage Kubota B-series (B6000, B6000E, B6000E-T) compact tractors. Covering both 2WD and 4WD drivetrains powered by the ZL600 diesel engine, having these precise factory limits directly at your bench prevents premature component failure. This ensures you execute a perfect repair the first time, avoiding the costly mistake of splitting the tractor twice for a single transmission job.

Shop-Level Component Data & Teardown Reference

Instead of generic overviews, this documentation focuses strictly on the hard data required for accurate teardowns and rebuilds across 17 detailed chapters. It thoroughly maps out the internal power flow through the transmission, speed change gears, and differential setups, helping mechanics quickly identify components and route assemblies correctly.

• Engine & Powertrain: Detailed breakdowns of the ZL600 diesel internal lubrication routing, fuel system structures, and transmission internals.
• Covered Sub-Assemblies: Explores the power take-off (PTO) shaft, three-point hitch, fuel injection pump, hydraulic control valve, steering gear case, differential lock mechanism, magnetic fuel pump, and glow plug controller.
• Additional Components: Provides teardown specifications for the silicon diode rectifier, mechanical brakes, dry single-plate clutch, pitman arm, front wheel hub, decompression device, and trochoidal oil pump.
• Maintenance Standards: A dedicated 9-page section listing strict factory wear limits for major gears, bearings, and shafts to help you determine exactly when parts need replacing.
• Torque & Clearances: Documents specific gear-train backlash tolerances, tightening torque values (listed in kg-m), and precise dimensional data for the axle, steering, and clutch assemblies.
• Diagnostics: Includes OEM diagnostic trouble charts for isolating power output drops or hard-starting issues efficiently.

By detailing step-by-step factory procedures—such as adjusting the spiral bevel pinion backlash with shims, synchronizing fuel injection timing, calibrating front wheel toe-in alignment, and configuring the hydraulic implement lift—this manual allows you to keep highly complex, specialized tasks in-house, avoiding a costly dealer repair.

Critical Specifications & Bench Data

Having the correct parameters on hand prevents costly rework. The manual clearly defines critical baseline shop data, including the transmission oil capacity at 2.38 gallons (9 liters). In the cylinder head tables, the intake valve clearance is tightly specified at 0.0079–0.0098 in (0.2–0.25 mm). You will also find precise specs for the steering setup, explicitly stating the 15:1 steering gear ratio.

To support heavy maintenance, the documentation outlines the tractor's electrical circuits and hydraulics. Beyond textual data, the content is heavily supported by visual aids, prominently featuring complete wiring diagrams for accurate electrical tracing. You will also find an engine performance curve chart, a gear train mating marks drawing, a fuel system routing schematic, a fan belt tension diagram, and a hydraulic system structure view. You get the exact factory numbers for essential relief valve settings and hydraulic lift adjustments alongside maintenance schedules for the engine oil, coolant, and battery.

Safety Note: Servicing heavy agricultural drivetrains and high-pressure hydraulic systems carries inherent physical risks. Always verify pressure relief settings, confirm secure lifting points, and adhere to factory torque limits before tearing into load-bearing chassis components or pressurized lines.