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Kubota B7200HST Troubleshooting

The Kubota B7200HST is a 2-wheel drive or 4-wheel drive compact utility tractor. This model was manufactured from 1983 to 1990. The tractor was designed in two versions: B7200HST-E (2WD) and B7200HST-D (4WD). The Kubota B7200HST driveline system components: Kubota D950 4-cycle vertical 3-cylinder liquid-cooled diesel engine and 2-range hydrostatic transmission with infinite forward and reverse gears.

A 56.6 cubic inches (927 cc) engine has a cylinder bore of 2.95" (75 mm), piston stroke of 2.76" (70 mm), and rated power of 17 hp (12.7 kW). Max forward speed - 3 mph (4.8 km/h) using low range or 7.6 mph (12.2 km/h) using high range, maximum reverse speed - 2.2 mph (3.6 km/h) using low range or 5.7 mph (9.2 km/h) using high range. The open center hydraulic system used a gear pump with rated capacity of 4 gpm (15.1 lpm).

The main relief pressure is 113 bar (1640 psi). The Kubota B7200HST was equipped with a manual steering system, differential dry internal-expanding brakes, 5.00x10 (2WD) or 6.00x12 (4WD) front tires, and 8.00x16 (2WD) or 9.50x16 (4WD) rear tires. The wheel base is 57.9" (1470 mm).

Compatible attachments for the tractor: a 60" mid-mount 3-blade Kubota RC60-72 mower deck with cutting height of 1.5-4.0 in (38-102 mm), 48" rear-mount Kubota B3538 finish mower, 51" front-mount dual-stage Kubota B2551 snowblower with hydraulic lift, Kubota B1630C front-end loader with lift capacity to full height of 510 lbs (231 kg), or Kubota B1640 front-end loader with lift capacity to full height of 510 lbs (231 kg).

Engine Troubleshooting
Engine doesn't start or starts hard
Fuel filter plugging - Install new filter element
Fuel shut-off valve closed - Open the fuel shut-off valve
Air in fuel lines - Bleed fuel lines
Fuel injectors are defective or dirty - Service or change fuel injectors
Defective fuel injection pump - Repair or replace injection pump
Low engine compression - Check cylinder block and replace defective parts
Diesel shuts off during operation
Low coolant temperature - Warm up to required temperature
Air in fuel pipes - Bleed fuel pipes
Uneven fuel injections - Repair or adjustment
Dirty fuel filter element - Service the filter
Fuel injectors are defective or dirty - Change fuel injectors
Diesel starts but suddenly stops
Fuel injection pump out of timing - Check and correct adjustments
Clogged fuel filter element - Service or replace the filter
Fuel injector nozzles are dirty or defective - Test injector nozzles and replace as required
Fuel injection pump is damaged - Repair or install a new fuel pump
Air cleaner clogging - Install new cleaner element or replace it
Engine stalls while idling
Incorrectly adjusted low idle speed - Adjust low idle speed
Damaged fuel injection pump - Repair or change injection pump
Fuel injector nozzles fault - Install a new set of well-balanced nozzles
Improper valve clearance - Adjust to proper valve clearance
Engine overheats
Not enough coolant - Top up coolant. Check for leaks or other malfunctions
Cooling system parts are failed or system is dirty - Change faulty components or flush the cooling system
Low engine oil level - Check and refill engine oil
Improper fan belt tension or damaged belt - Adjust properly or change the belt
Thermostat fault - Install new thermostat
Low engine power
Dirty or damaged injectors - Change fuel injectors
Fuel injection pressure is wrong - Repair or replace injection pump
Dirty air filter - Change or service air filter element
Clogged oil filter element - Replace or service engine oil filter
Engine is running overloaded - Reduce load or shift to lower gear
Valve clearance is out of adjustment - Correct valve clearance
Low idle speed adjustment is incorrect - Correct the settings
Restricted fuel pipes or hoses - Service fuel hoses and pipes
Engine compression is low: Valves are faulty or leaking - Install new valves
Engine knocks or noises
Timing of fuel injection pump is wrong - Repair or replace fuel injection pump
Fuel injector nozzles are damaged - Change or clean injector nozzles
Insufficient engine oil - Checking oil level and add if necessary
Engine is not fully warmed up - Warm up to required temperature
Main bearings or crankshaft wear - Change defective components as required
Piston rings are damaged or broken - Piston rings replacement required
Loose flywheel screws - Check the flywheel screws and tighten as required
Diesel engine using too much oil
Oil leaking: Damaged seals or gaskets - Replace to repair leaks
Oil viscosity is wrong - Fill up with the proper oil viscosity
Piston rings are defective or worn - Replace piston rings
Damaged valve guides or valve stems - Change the valves
Cylinder liners or pistons are worn - Check pistons and liners, change as required

Electrical System Troubleshooting
Battery does not charge
Battery is worn - Battery change required
Battery electrical wire harness damage - Check battery wires for damage, replace or change
Battery terminals and cables are loose or corroded - Tighten or service cables and terminals
Belt is damaged or belt tension is incorrectly adjusted - Adjust belt tension properly or replace belt
Starter cranks slowly
Battery voltage is low - Battery needs to be recharged
Battery is not holding charge - Service or replace the battery
Bad battery wiring harness - Inspect wiring for malfunctions, replace or repair
Loose or corroded battery cables and terminals - Tighten or clean terminals and cables
Starter will not work
Low battery voltage - Charge the battery
Drained or worn battery - Recharge or change battery
Starter motor failure - Repair or change starter
Incorrectly connected or disconnected wires - Check battery wires and connect correctly

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission is making noise
Dirty transmission oil or insufficient oil level - Change the oil or fill to required level
Defective or out of adjustment speed control rod linkage - Adjust or change rod linkage
Faulty relief valve - Change the valve
Excessive transmission load - Load needs to be reduced
Damaged or worn transmission parts - Change or repair damaged parts
Hot transmission oil
Not enough oil in transmission - Fill the transmission housing to proper oil level
Clogged transmission fluid filter element - Change or service the transmission fluid filter
Damaged or clogged cooling components - Inspect all cooling components and replace or clean if necessary
Excessive transmission load - Reduce transmission load
Loss of power
Oil level is insufficient - Add transmission oil as required
Low charge pressure - Check charge pressure
Defective or worn relief valve - Change the valve
Transmission fluid leaks
Worn gaskets or seals - Change defective gaskets or seal
High pressure inside the transmission case - Replace defective components
Plugged transmission fluid drain pipe - Service or change drain pipe

Hydraulics Troubleshooting
Hydraulic system is too hot
Hydraulic system pressure is unadjusted - Adjust the pressure as required
Main relief valve failure or incorrect setting - Set up or change the relief valve
Hydraulic fluid contamination - Change hydraulic fluid
Air in hydraulic system - Inspect the suction pipe, fittings, and pump seals
Low hydraulic oil pressure
Not enough hydraulic oil in the system - Add oil to the hydraulic system
Hydraulic fluid filter element clogging - Clean the hydraulic filter element or replace if necessary
Damaged hydraulic oil pump - Check the pump performance and replace it if required
Hydraulic spool valve is not set properly or defective - Replace or adjust properly
Defective hydraulic cylinder - Inspect cylinder components for wear or damage and change if required
Leakage in hydraulic pipes - Find leaks in hydraulic system and repair it
3-point hitch won't raise or raises slowly
Lack of hydraulic oil - Fill up the hydraulic oil
Cold oil in hydraulic system - Wait for oil to warm up
Hydraulic oil filter element clogging - Change the hydraulic filter element or service if required
Hydraulic pump malfunction - Flow-rate hydraulic pump and replace pump if necessary
Main relief valve is damaged or adjusted improperly - Set up or change the relief valve
Faulty or incorrect setting hydraulic spool valve - Adjust correctly or replace
Hydraulic cylinder malfunction - Check cylinder components for wear or damage and change if necessary
Suction pipe is damaged or loose - Repair or change
3-point hitch won't drop or drops slowly
Faulty or incorrect setting hydraulic control valve - Adjust properly or replace
Faulty hydraulic cylinder - Inspect cylinder components for wear or damage and change if required
Damaged hitch rock shaft - Install a new shaft
The hitch has any internal mechanical damage - Change worn or defective hitch components
Hitch jerks when lower or lift
Hydraulic system sucks air - Inspect the suction pipe, fittings, and pump seals
Contaminated hydraulic fluid - Change hydraulic fluid
Hydraulic pump malfunction - Check pump flow and change pump if necessary
Hydraulic spool valve is not set properly or defective - Set properly or replace
Broken hydraulic cylinder - Check cylinder components for damage or wear and change if necessary

Steering System Troubleshooting
Hard Steering
Steering knuckle or steering column is stuck - Inspect steering column and knuckle, replace worn parts
Steering gearbox components are worn - Replace defective components of steering gearbox
Faulty drag link or tie rod - Replace or repair
Insufficient lubrication in steering box - Need to lubricate the gearbox
Not adjusted toe-in alignment - Check and adjust toe-in
Tires are not correctly inflated - Inflate tires as necessary
Excessive steering wheel free play
Steering column bearing or shaft is worn - Change faulty parts
Steering linkage assembly is worn or loose - Repair or replace steering linkage
Worn steering gearbox bearings - Replace the bearings
Front wheel hub bearings or steering knuckles are worn - Change hub bearings or knuckles
Damaged or worn steering tie-rod ends - Change faulty part
Tractor pulls to right or left
Worn or loose steering linkage assembly - Repair or replace steering linkage
Defective steering knuckle bushing - Replace knuckle bushing
Uneven tire pressure - Inflate the tires properly
Toe-in adjustment is incorrect - Adjust toe-in correctly



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