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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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| Oil level is insufficient - Add transmission oil as required |
| Low charge pressure - Check charge pressure |
| Defective or worn relief valve - Change the valve |
| 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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| Farm Tractors Technical Specifications |
