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

This Kubota service manual (P/N 70000-70168) covers B6000 4WD and B6000E 2WD compact tractors powered by the ZL600 diesel engine. It also provides B6000E-T specifications and shared maintenance-standard tables, while separate transmission and speed-change sections distinguish the B6000 and B6000E layouts.

• Engine and fuel system: Engine removal, nozzle testing, injection timing adjustment, valve-clearance checks, and cylinder-head and crankshaft assembly reference.

• Front axle and steering: 4WD axle disassembly, front wheel hub and knuckle service, toe-in adjustment, and steering gear-case assembly.

• Clutch and drivetrain: Brake disassembly, clutch and pedal adjustments, differential-lock adjustment, transmission teardown, and spiral bevel pinion setting.

• Hydraulic lift and PTO: Gear pump, control valve, single-acting cylinder, implement lift adjustment, PTO shaft data, and B6000 three-point hitch installation.

• Electrical diagnosis: Wiring diagram, starter and generator data, silicon-diode rectifier, magnetic fuel pump, glow plug controller, and battery troubleshooting charts.

This manual suits mechanics and experienced owners who are comfortable with tractor disassembly and measuring gear, shaft, and bearing clearances.

ZL600 Fuel System and Engine Assembly

The fuel section describes the Model PFA injection pump and nozzle holder, including atomization checks and shim-based injection timing adjustment. A fuel system schematic and engine performance curve accompany the text.

Engine repair coverage includes cylinder-head tightening, crankshaft bearing assembly, valve-timing data, and the decompression device. The lubrication section explains the trochoidal oil pump and oil passages supplying the crankshaft and rocker arms.

The gear-train mating marks drawing supports engine reassembly. A separate fan-belt tension diagram accompanies cooling-system and generator-drive checks.

Injection-pump precautions explain how excessive delivery-valve-holder torque can crack the pump housing and interfere with control-rack movement. The section also cautions against disturbing sealed pump adjustments.

Transmission, Differential, and Steering Service

Separate B6000 and B6000E transmission and speed-change views help identify the correct shift and front-drive hardware before teardown. Differential case procedures cover shaft and gear removal, assembly orientation, and shim adjustment for spiral bevel pinion engagement.

The front axle chapters distinguish the driven axle assembly from the wheel hub and knuckle arrangement used on the two-wheel-drive configuration. Steering instructions cover the steering shaft, sector shaft, gear case, and pitman arm alignment.

Clutch coverage includes the dry single-plate assembly, pedal free play, and release mechanism. Its precautions connect insufficient free play with continuous release-bearing loading, bearing seizure, and scorched disk facings. Brake pedal and differential-lock adjustments are covered alongside the clutch controls.

Hydraulic Lift, PTO, and B6000 Hitch

Hydraulic system structure and control-valve operating views show oil routing, lift operation, relief-valve adjustment, and the external two-way cock. The hydraulic system shares the transmission oil supply, linking its service requirements to transmission maintenance.

The PTO section provides shaft dimensions and speed references. Three-point hitch attachment and adjustment procedures apply to the B6000 only; the manual explicitly limits implements requiring this hitch to that model. Upper-link, lift-rod, and check-chain adjustments are included.

Electrical Fault Tracing and Maintenance Standards

The wiring diagram includes wire-color codes and switch-contact layouts for tracing the starting, lighting, charging, and glow-plug circuits. Component sections supply starter brush data, generator specifications, rectifier information, and magnetic fuel-pump operating details.

Battery and engine troubleshooting charts address hard starting, reduced output, sudden stopping, and abnormal exhaust. These symptom-based charts connect faults with likely causes and the corresponding inspection or service area.

The three-page Tractor Maintenance Standard section compares chassis dimensions, clearances, backlash, and wear limits for gears, shafts, bearings, brakes, and clutch components. Component-specific tightening torques, including kg-m values, appear in the service instructions. The maintenance checklist covers oil, coolant, battery, filters, and lubrication points.

Safety note: Tractor disassembly involves heavy components and pressurized hydraulics. Use secure support and follow the manual’s handling precautions and torque specifications.

A Preview of Valve, Lubricant, and Steering Data

These examples are a small selection of the service data included in the manual. The ZL600 valve-clearance adjustment section specifies 0.0079–0.0098 in (0.2–0.25 mm) with the engine cold.

The maintenance checklist lists transmission case oil capacity as 2.38 gal (9 liters). The chassis maintenance-standard tables give a 15:1 steering gear ratio for both the B6000 and the B6000E (T) grouping.

PDF Search, Wiring Detail, and Page Count

Search and wiring detail: PDF text search and embedded bookmarks are not available. Small wiring codes require zooming, and some fine switch-contact markings remain difficult to distinguish.

Supplied as one printable, English-language 52-page PDF. The total includes 49 pages of manual content, one front cover, one contents page, and one back cover; these pages are already included in the stated count.