Kubota B5100D B5100E B6100D B6100E B7100D 1978–1984 Shop Service Manual (P/N K-2)

• Covers Kubota B5100D, B5100E, B6100D, B6100E, B6100HST-D, B6100HST-E, B7100D, B7100HST-D, and B7100HST-E tractors, with separate material for two-wheel-drive, four-wheel-drive, gear-transmission, and hydrostatic configurations.
• Engine repair content includes removal and installation, cylinder-head and valve-train service, timing-gear alignment, piston and rod work, camshaft and crankshaft overhaul, dry cylinder-liner replacement, oil-pump inspection, and governor service.
• Hydrostatic transmission coverage distinguishes Type I and Type II units by tractor serial number and provides case-, charge-, and high-relief-pressure tests, a vacuum test, neutral and speed-control linkage adjustment, removal, internal inspection, and reassembly requirements.
• Six-speed transmission sections cover tractor splitting, clutch centering and release-lever checks, shifter mechanisms, gear and shaft inspection, differential-lock service, and model-specific transmission layouts.
• Front and rear driveline chapters address steering gear, kingpins, pivot bushings, toe-in, front-drive outer housings, axle shafts, differential and bevel gears, final drives, brakes, rear PTO, mid-PTO, and PTO one-way clutches.
• Hydraulic lift material includes fluid and filter service, relief-pressure testing, implement-lowering adjustment, pump and control-valve repair, lift-cover overhaul, and the optional hydraulic block for external attachments.

This 46-page PDF reproduces the Kubota tractor section previously contained in Intertec’s I&T Shop Service Manual No. K-2, copyright 1986. It is a condensed Intertec shop-manual section, not the complete K-2 volume or a Kubota factory manual. The dense repair procedures and measurement requirements make it best suited to mechanics and experienced owners who already have the pullers, gauges, holding fixtures, and lifting equipment required for tractor teardown.

Model and Variant Identification

The condensed service-data tables identify the engine installed in each tractor group: the two-cylinder Z500-1A in the B5100D/E, D650-A in the B6100D/E, D650-AH in the B6100HST-D/E, D750-A in the B7100D, and D750-AH in the B7100HST-D/E. Those tables organize tune-up data, engine dimensions, wear limits, capacities, approved fluids, and U.S./metric specifications by configuration instead of treating the B-series as mechanically identical.

Hydrostatic buyers should check the serial break before selecting repair information. Type I applies before serial 50127 on the B6100HST-D, 11140 on the B6100HST-E, 51742 on the B7100HST-D, and 11906 on the B7100HST-E; Type II begins at those serial numbers. Cross-sectional views and assembly details show the differences. The six-speed models have their own gear, shaft, PTO-drive, and shifter illustrations, including distinct layouts for the B5100D/E, B6100D/E, and B7100D.

Repair Depth and Diagnostic Data

This is more than a maintenance reference. It covers engine/clutch-housing and clutch-housing/transmission-case splits, component removal and installation, teardown inspection, reassembly, adjustment, and operational checks. Specifications include component torque tables, gear backlash and end-play data, bearing and bushing clearances, hydraulic test pressures, electrical test values, fluid capacities, and inspection limits. Fuel-system material covers bleeding and injection timing plus injector opening-pressure, seat-leakage, and spray-pattern testing. Injection-pump recalibration is specifically left to a qualified diesel shop with the required equipment and training.

Two identified service-tool references are included: Kubota tool 07916-60841 or an equivalent for removing the HST high-pressure relief-valve seat, and tool kit 07916-50041 for hydraulic lift relief-pressure testing. Clutch-centering and measuring tools, dial indicators, pullers, pressure gauges, and suitable support fixtures are also shown or called out.

The repair cautions are assembly-specific. HST piston and cylinder-block components are matched sets, and the pump-side valve plate is identified by two notches; the manual also calls for shaft protection during port-block installation so the seal lips are not damaged. An incorrectly set rear-PTO control-rod interlock can allow excessive universal-joint angle and damage the PTO drive shaft.

Figures, Schematics, and Scope

Numbered illustrations run through Fig. 106. They combine exploded assemblies, section views, test setups, and adjustment drawings rather than consisting entirely of exploded views. Particularly useful examples include the drive-gear timing diagram, Type I and Type II HST cross-sections, the HST pressure-test port view, model-specific range-transmission gear and shaft layouts, and the hydraulic pump-to-control-valve line view. The final two pages provide separate wiring schematics for the B5100D/E and B6100D/E group and for the B6100HST-D/E, B7100D, and B7100HST-D/E group.

Exploded-view callouts support disassembly and correct installed position, but this publication is not a parts-ordering catalog. Tractor splitting, raised-machine support, injector testing, rotating PTO work, and hydraulic pressure checks require the securing, lifting, isolation, and test practices specified for the job.