This document is a workshop manual for Kubota B6200HST and B7200HST tractors, covering models B6200HST (2WD and 4WD) and B7200HST (2WD and 4WD). It provides detailed information on the tractor's mechanism, servicing, and general maintenance.
General Features:
The manual highlights several key features of the tractor. The engine cylinder displacement is increased to augment its output. The hydraulic pump delivery is increased by 25% (compared with B6100HST) to take care of front loader and other implements. The fuel tank capacity is increased to permit longer hours of continuous operation, with the tank being metallic, tough, and durable. A fuel gauge constantly reminds the user of the remaining amount of fuel. The seat is newly styled and engineered for greater comfort, and the operator's area is enlarged for less-tiring posture. A spring-suspended seat absorbs shock from the ground to reduce fatigue. The seat can be easily shifted back and forth so the user can select the most comfortable position. The fender edge is rolled back to prevent injury during tire replacement. The positive control for the hydraulic unit greatly improves maneuverability, a feature available for B6200HST 4WD and B7200HST 4WD. A rear hydraulic outlet is provided under the operator's seat, and with an outlet valve (optional), implement operations are greatly assisted. The hydraulic block type outlet for the front loader is provided at the right side of the tractor. The wheelbase is lengthened to receive the 60-inch mid-mounting mower for greater mowing capability. A bevel gear type front axle is adopted, and engine output is transmitted to the front wheels for powerful, smooth driving action. This feature is available for B7200HST 4WD only. The side and front of the tractor, near the engine, are each fitted with a safety cover. This safety feature prevents burns and other accidents caused by touching the rotating or hot parts of the engine. Optional ROPS is recommended for added safety and can be attached at any time.
Technical Specifications (B6200HST 2WD/4WD):
- Engine: Kubota D850-LA-H, vertical, water-cooled, 4-cycle diesel.
- Bore and stroke: 72 mm x 70 mm (2.83 in. x 2.76 in.).
- Total displacement: 855 cc (52.2 cu. in.).
- Rated revolution: 41.7 r/s (2500 rpm).
- Maximum torque: 49.1 N-m, 5.01 kgf-m, 36.2 ft-lbs (1800 rpm).
- Governor: Centrifugal ball mechanical governor.
- Injection nozzle: Throttle type (ND-DN12SD12).
- Injection timing: 0.35 to 0.38 rad. (20 to 22 deg.) before T.D.C.
- Injection pressure: 13.7 to 14.7 MPa (140 to 150 kgf/cm², 1991 to 2131 psi).
- Cooling system: Pressurized radiator. Forced circulation with water pump.
- Starting system: Electric starting with coil starter (12V, 0.8kW).
- AC dynamo: 12V, 150W.
- Battery: 12V, 40AH.
- Fuel: Diesel fuel No.1-D (below 10°C (15°F)) (ASTM D975), MIL-L-2104B or MIL-L-2104C, quality better than CC class (API).
- Weight (Dry): 105.0 kg (231 lbs).
- Fuel tank: 30 L (7.9 U.S.gals., 6.6 Imp.gals.).
- Transmission case: 13.5 L (3.6 U.S.gals., 3.0 Imp.gals.).
- Front axle case (4WD): 0.5 L (0.13 U.S.gals., 0.11 Imp.gals.).
- Tires: Front 4.50-10 (2WD), 5-12 (4WD); Rear 7-16 (2WD), 8-16 (4WD).
- Overall length: 2390 mm (94.1 in.).
- Overall width: 990 mm (39.0 in.).
- Overall height (with muffler): 1795 mm (70.7 in.).
- Min. ground clearance: 230 mm (9.1 in.).
- Treads: Front 910 mm (35.8 in.); Rear 740 mm (29.1 in.).
- Weight (kg): 525 (1158) (2WD), 535 (1180) (4WD).
Transmission Mechanism:
The tractor features a hydrostatic transmission (HST) and a mechanical transmission. The HST consists of a variable displacement piston pump and a fixed displacement piston motor, charge pump, and valve system. The mechanical transmission includes high-low gear shift, front wheel drive (4WD type only), and PTO shift sections. A one-way clutch cam section is also present.
Hydraulic System:
The hydraulic system includes an oil cooler (radiator type) located in front of the engine radiator. Hydrostatic transmission produces heat, which is dissipated by the oil cooler.
Electrical System:
The electrical system includes a wiring diagram and electrical circuit.
General Maintenance Features:
The manual outlines a comprehensive maintenance schedule with check points at various intervals: initial 35 hours, 50 hours, every 75 hours, 100 hours, 150 hours, 300 hours, 400 hours, 500 hours, every one to two months, every three months, every year or every six times of cleaning, every year, every two years, and every 800 hours.
Key Maintenance Procedures:
- Changing Engine Oil: Drain plugs are used to remove oil. Fill new oil up to the upper line on the dipstick.
- Replacing Engine Oil Filter Cartridge: Remove the old cartridge, clean the mounting surface, apply a slight coat of oil to the new gasket, and screw in the new cartridge.
- Changing Transmission Oil: Drain plugs are used to remove oil. Fill new oil up to the upper line on the dipstick.
- Cleaning Oil Strainer: Remove the oil strainer and clean it with kerosene.
- Replacing Transmission Oil Filter Cartridge: Replace the cartridge after initial 50 hours and every 200 service hours.
- Greasing Points: King pins, center pin (2WD type), clutch pedal shaft, brake pedal shaft, speed control pedal shaft, and clutch release hub.
- Checking Hydraulic Inlet Line Clamps and Fuel Line Clamps: Ensure connections are secure.
- Cleaning Air Cleaner Element: Clean the element with compressed air or by soaking it in a cleaning solution.
- Checking Fan Drive Belt Tension: Measure deflection and adjust if necessary.
- Checking Clutch Pedal Play: Measure pedal movement at the footrest and adjust if necessary.
- Checking Brake Pedal Play: Measure pedal movement and adjust if necessary.
- Checking Steering Wheel Play: Measure steering wheel play and adjust if necessary.
- Checking Water Pipes and Clamps: Check for loose clamps, apply lubricant, and retighten.
- Changing Transmission Oil: Refer to the 50-hour check for details.
- Changing Front Axle Case Oil (B6200 HST 4WD and Front Axle Case Oil (B7200 HST 4WD)): Drain and fill new oil to the specified level.
- Replacing Fuel Filter: Unscrew the filter bowl, remove the element, clean, and replace.
- Cleaning Cooling System: Clean the engine cooling system every 500 service hours, when changing anti-freeze, or every year.
- Charging Battery: Check specific gravity and water level. Recharge if necessary.
- Changing Scale Inhibitor and Coolant: Drain old coolant, clean radiator interior, and fill with new coolant.
- Replacing Air Cleaner Element: Replace every year or every six times of cleaning.
- Replacing Water Pipes and Clamps: Replace if defective.
- Replacing Fuel Line and Clamps: Replace if defective.
- Replacing Hydraulic Hose and Clamps: Replace if defective.
- Checking Valve Clearance: Refer to the Diesel Engine Workshop Manual for D750-LA, D850-LA-H, D950-LA, D850-LA-H, D950-LA-H (Code No.07909-70121).
The manual lists several special tools for specific tasks:
- Special-use Puller Set (07916-09032): For pulling out bearings, gears, and other parts.
- Pitman Arm Puller (07909-39011): For pulling out pitman arm from tractor.
- Tie Rod End Lifter (07909-39021): For easy removal of tie rod end from tractor.
- Steering Wheel Puller (07916-51090): For easy removal of steering wheel without damaging the shaft.
- Clutch Center Tool (For B Series Tractor) (07906-50032): To fit clutch to flywheel and adjust release lever height.
- Clutch Center Tool (For B and L Series Tractors) (07916-51050): For all B and L series tractors with a diaphragm clutch by changing tip guides.
- Bushing Puller Set (07916-51031): For pulling out the front axle support bushing from the front axle.
- Camber, Caster and King Pin Gauge (07909-31691): Allows easy measurement of camber angle, caster angle, and king pin inclination for all tractor models.
- Turning Radius Gauge (07909-31701): Allows easy measurement of steering angle for all tractor models.
- Toe-in Gauge (07909-31681): Allows easy measurement of toe-in for all tractor models.
- Injector (07916-52501): For models where traction is required, liquid (water) can be injected into the tires to add weights.
- Relief Valve Set Pressure Tester (07916-50044): Allows easy measurement of relief set pressure for all tractor models.
- Hydrostatic Transmission Testing Kit (07916-52040): Allows easy measurement of hydrostatic transmission pressure for B6200-B7200 HST tractor.
- Special Tool A for Pressing Oil Seal (0011F101): For pressing oil seals.
Servicing and Disassembly:
Detailed instructions are provided for disassembling and servicing various components, including:
- Speed Set Device: Disassembly, assembly, and adjustment of the speed set lever.
- Hydrostatic Transmission: Checking and adjusting reverse speed, neutral, and various pressures (high relief, case relief, charge, vacuum). Disassembly and assembly of components like the neutral holder, front wheel drive shaft, port block, motor cylinder block, pump cylinder block, charge pump, input shaft, cylinder block bore and pistons, piston slipper and retainer plate, cylinder block face, valve plate, swashplate and thrust plate, trunnion shaft cover, oil seal and bearing, case relief valve, and high pressure relief valve.
- Mechanical Transmission: Disassembly and assembly of the fork shaft and shift fork, spiral bevel pinion shaft, 4th shaft, front wheel drive shaft, 2nd shaft and 29T-18T-18T gear, 3rd shaft and 21T-21T-17T gear, and mid-PTO.
- Differential Gear Case: Disassembly and assembly of the differential assembly and 5th shaft.
- Transmission (Transmission Case, Differential Gear Case): Servicing of the PTO shaft, gear backlash, and clearance between shift fork and shift gear groove.
The manual emphasizes the importance of using genuine Kubota parts and special tools for maintenance and repair to ensure proper performance and safety. It also includes warnings and cautions regarding safety procedures and potential damage to the tractor if instructions are not followed correctly.
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