Overview
The Kubota B6100HST and B7100HST Tractor Workshop Service Manual provides technical documentation for maintenance, troubleshooting, inspection and component repair of these Kubota compact tractors. The workshop reference covers engine components, lubrication, cooling, fuel injection, clutch, hydrostatic transmission (HST), mechanical transmission, rear axle, differential, front axle, steering, brakes, hydraulic equipment and electrical systems. It provides component construction, operating principles, service specifications, adjustment, disassembly and repair information for the covered tractor assemblies.
The documentation includes hydrostatic pump and motor operation, transmission oil flow, HST pressure testing, charge-pump service tools, speed-set controls, front-wheel-drive mechanisms and power take-off (PTO) transmission. Dedicated chapters address engine fuel-system servicing, axle and brake repairs, hydraulic pump and control-valve inspection, implement hydraulic circuits and electrical diagnosis. An additional New HST section provides separate mechanism and servicing information, while general references cover tractor identification, lubricants, equipment separation and tune-up adjustments.
Notice: The workshop documentation contains both a main Hydrostatic Transmission section and a separately indexed New HST section. These sections should be distinguished when selecting checking, adjustment or disassembly procedures. Confirm the applicable transmission configuration and model-specific specifications before carrying out repairs.
Table of Contents
Kubota B6100HST, B7100HST Manual
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01. General
- Tractor Identification
- B7100HST Technical Specifications
- B6100HST Technical Specifications
- Fuel and Lubricant Requirements
- Tractor Component Separation
- Engine and Tractor Tune-Up
- Checking and Adjustment Procedures
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02. Engine Body
- Engine Body Construction and General Description
- Engine Body Disassembly
- Engine Component Inspection and Servicing
- Engine Body Assembly
- Engine Specifications — B7100HST
- Engine Specifications — B6100HST
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03. Lubricating System
- Engine Lubricating System Construction
- Lubricating System Servicing
- Lubricating System Specifications
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04. Cooling System
- Engine Cooling System Construction
- Cooling System Servicing
- Cooling System Specifications
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05. Fuel System
- Fuel System Construction and Operation
- Fuel System Troubleshooting
- Fuel Filter Inspection and Servicing
- Fuel Pump Servicing
- Fuel Injection Pump
- Fuel Injection Nozzle
- Engine Governor Mechanism
- Fuel System Component Servicing
- Fuel System Specifications
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06. Clutch
- Clutch Construction and General Description
- Clutch Component Servicing
- Clutch Service Specifications
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07. Transmission and Hydrostatic Drive
- Transmission Construction and General Description
- Mechanical Gear Transmission
- Transmission Drive System
- Front-Wheel-Drive Mechanism
- Power Take-Off (PTO) Transmission
- Hydrostatic Transmission (HST)
- Hydrostatic Transmission Operating Principles
- Hydrostatic Hydraulic Oil Flow
- Hydrostatic Transmission Troubleshooting
- HST Pressure Checking
- Hydrostatic Transmission Disassembly
- Hydrostatic Transmission Component Inspection
- Hydrostatic Transmission Assembly
- Special Tool Fabrication for the Charge Pump
- Hydrostatic Transmission Control Linkage
- Transmission Servicing Specifications
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08. New HST
- New Hydrostatic Transmission Mechanism
- Hydrostatic Transmission Servicing Information
- New HST Service Specifications
- Speed-Set Device
- HST Checking and Adjustment
- Hydrostatic Transmission Disassembly and Assembly
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09. Rear Axle and Differential
- Rear Axle and Differential Construction
- Rear Axle and Differential Disassembly
- Rear Axle and Differential Servicing
- Rear Axle and Differential Specifications
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10. Front Axle
- Front Axle Construction and General Description
- Front Axle Troubleshooting
- Front Axle Disassembly
- Front Axle Component Servicing
- Front Axle Specifications — B7100HST
- Front Axle Specifications — B6100HST
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11. Tires and Front Wheel Alignment
- Tyre and Front Wheel Alignment Information
- Tyre and Front Alignment Specifications
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12. Steering
- Steering System Construction
- Steering System Troubleshooting
- Steering Component Disassembly
- Steering Component Servicing
- Steering Service Specifications
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13. Brakes
- Brake System Construction
- Brake Troubleshooting
- Brake Component Disassembly
- Brake Component Servicing
- Brake Service Specifications
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14. Hydraulic System
- Hydraulic System Construction and Operation
- Hydraulic System Troubleshooting
- Hydraulic Pump Construction and Servicing
- Hydraulic Control Valve
- Hydraulic Cylinder Servicing
- Hydraulic Power Take-Off Circuit for Other Implements
- Hydraulic Component Disassembly
- Hydraulic Component Inspection and Servicing
- Hydraulic Block Assembly
- Hydraulic Oil Filter
- Hydraulic Oil Cooler
- Hydraulic System Specifications
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15. Electrical System
- Electrical System Construction and General Description
- Electrical System Troubleshooting
- Battery Inspection and Servicing
- Engine Key Switch
- Starter Motor
- Glow Plug and Safety Switch
- AC Dynamo and Voltage Regulator
- Hour Meter and Instrumentation
- Headlight Electrical System
- Hazard Warning Lamps
- Optional Large-Capacity AC Dynamo Installation
- Electrical System Specifications
Original and New HST Systems — Pressure Testing and Speed-Set Adjustment
The workshop documentation distinguishes the main hydrostatic transmission mechanism from a separately indexed New HST section. The main transmission chapter explains hydraulic oil flow, operating principles, pressure checking, component disassembly and inspection, including special tools for the charge pump. The New HST section adds specific references for the speed-set device, checking, adjustment and assembly. When diagnosing weak drive performance or irregular speed control, identify the applicable HST arrangement before using pressure measurements or adjusting transmission components.
The hydraulic chapter provides additional references for the pump, control valve, hydraulic block, oil filter, oil cooler and implement power take-off circuit. These subjects should be distinguished from the hydrostatic transmission’s own oil-flow and pressure-testing procedures. The electrical documentation also identifies an optional large-capacity AC dynamo installation, making it important to confirm the fitted charging equipment before applying electrical specifications or servicing instructions.
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