1988–1997 Kubota B1550/B1750/B2150 Gear & HST Compact Tractor and Mower Workshop Manual (P/N WSM 10221/10222, 60354-0 series)

This Kubota WSM 60354-0 workshop manual covers 1988–1997 B1550, B1750, and B2150 compact tractors with gear-drive or HST transmissions. Integrated supplements address later HST assemblies and B2150 Bi-speed Turn equipment, while the mower chapter covers RC54-B, RC60-B, RC60-21B, and RC72-B attachments.

• Engine repair: Compression testing, cylinder-head service, crankshaft and bearing inspection, cylinder-liner replacement, injection-timing checks, and fuel-system testing.

• Clutch and transmission: Tractor separation, single-plate and dual-stage clutch service, gear-train disassembly, HST pressure testing, and neutral-position adjustment.

• Axles and brakes: Differential repair, bevel-gear backlash and tooth-contact checks, Bi-speed Turn clutch adjustment, and internal-expanding brake inspection.

• Hydraulics and steering: Pump flow tests, relief-pressure checks, position-control valve repair, hydraulic-cylinder service, and manual or power-steering diagnosis.

• Electrical diagnosis: Wiring diagrams, starter and charging-system tests, engine shut-off circuit checks, Easy Checker diagnosis, and gauge testing.

• Mower service: Mounting and linkage adjustment, cutting-height charts, blade and belt replacement, spindle-bearing service, and gearbox inspection.

This is workshop-level material for readers already comfortable with tractor disassembly, precision measuring tools, and hydraulic test equipment.

Engine, Fuel System, and Cooling

Engine sections cover the cylinder block, crankshaft journals, piston assemblies, and bearing clearances. The D850-5B material distinguishes the linerless crankcase update and includes a service-liner installation procedure, so the cylinder-repair information is not limited to the original liner-equipped construction.

The Bosch K-type injection-pump coverage includes pump-element and delivery-valve fuel-tightness tests, nozzle checks, and injection-timing adjustment. Fuel lift-pump removal and fuel-line bleeding are also documented. Valve Timing charts and component section views accompany the mechanical explanations.

Cooling-system service includes wax-pellet thermostat testing, radiator and radiator-cap pressure checks, and water-pump removal and installation.

Clutch Service and HST Troubleshooting

The clutch sections distinguish the dry single-plate assemblies from the dual-stage clutch used on the gear-drive B2150. Release-lever adjustment and clutch inspection are supported by tool references, including clutch-centering kit 07916-90052.

HST troubleshooting flowcharts connect loss of drive, overheating, and failure to stop in neutral with the relevant control checks and pressure tests. This helps narrow a drive complaint before internal pump or motor inspection. Oil Flow and Valves diagrams and power-flow views explain the different transmission arrangements.

The overhaul notes specifically address the risk of dirt and handling damage to the HST’s polished precision surfaces. Separate procedures cover piston slippers, cylinder blocks, valve plates, relief valves, and charge-pump inspection.

Axles, Brakes, and Bi-speed Turn

Axle service extends to differential disassembly, bearing inspection, gear backlash, tooth contact, and pinion turning torque. The rear differential material identifies a revised pinion-shaft and dowel-pin arrangement by tractor serial number.

Bi-speed Turn coverage includes linkage settings, clutch-disc and friction-plate inspection, and dynamic friction-torque adjustment. The B2150 supplement distinguishes measurements taken at the front drive shaft from those taken at the wheel hub.

Brake sections cover pedal adjustment, drum and shoe wear, and brake-cam inspection. Chassis reference material also includes tread settings, dimensions with ROPS, and implement-limit tables.

Hydraulic Controls and Steering

Hydraulic Circuit diagrams show the pump, hydraulic block type outlet, flow-priority valve, and connections to steering and implement circuits. Service procedures include flowmeter testing, relief-pressure adjustment, hydraulic-cylinder inspection, and position-control feedback settings.

The position-control explanation covers the shockless mechanism during lifting and lowering. Serial-specific cylinder-cap specifications and the revised lowering-speed mechanism are included.

Manual and integral power steering receive separate service coverage, including steering effort, backlash, relief pressure, and bleeding. Power-steering ball-nut assemblies are serviced as units and must not be disassembled.

Electrical Circuits and Mower Repair

Wiring Diagram and Electrical Circuit pages support checks of starter magnet switches, glow plugs, the engine-stop timer relay, and the fuel cut-off solenoid. AC dynamo/regulator circuits and Canadian alternator/IC regulator circuits are treated separately, alongside Easy Checker, lighting, and gauge diagnosis.

The mower chapter pairs RC54-B and RC60-B with the B1550/B1750 families, and RC60-21B and RC72-B with the B2150 family. Power Transmission views accompany gearbox, pulley, spindle, and blade service. Incorrect mower connecting-rod adjustment can damage the lift frame, a specific concern addressed in the linkage section.

Heavy equipment maintenance carries inherent risks; review the manual’s safety precautions before tractor separation or work around PTO-driven equipment.

HST Capacity and Belt-Check Examples

Transmission-case capacities are listed as 13.5 L (14.3 U.S. qt.) for B1550HST and B1750HST, and 18 L (19 U.S. qt.) for B2150HST.

For the fan-drive-belt check, the manual specifies approximately 10 mm (0.4 in.) deflection under a 98 N (22 lb) force at the belt midpoint. Cooling-system reference data also include thermostat opening temperatures and radiator-cap pressure-test criteria.

Text Search, Bookmarks, and PDF Contents

Search and diagram detail: An embedded OCR text layer supports searches throughout the manual, although recognition errors can affect exact model-code and numeric searches. PDF bookmarks lead to the main service sections, supplements, and mower chapter. Small wiring labels require zooming, and some electrical diagrams extend across facing pages.

One printable, English-language 573-page PDF contains the tractor workshop sections, integrated supplements, and a 21-page mower chapter. The total already includes 12 blank pages.