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Kubota G6200 Troubleshooting

The Kubota G6200 garden tractor was manufactured between 1986 and 1990. The Kubota G6200 driveline consists of a Kubota D640 3-cylinder vertical water-cooled naturally aspirated diesel engine and 3-range hydrostatic transmission with infinite forward and reverse gears.

A 38.9 cubic inches (637 cc) engine has a cylinder bore of 2.6" (66 mm), piston stroke of 2.45" (62 mm), and rated power of 16 hp (11.9 kW). Max. forward speed - 6.5 mph (10.5 km/h), max. reverse speed - 3.2 mph (5.1 km/h).

The tractor was equipped with a manual steering system, disc brakes, 16x6.50-8 front tires, and 23x10.5-12 rear tires. The wheelbase is 47.2" (1190 mm). The Kubota G6200 can be equipped with the following attachments: a 40" mid-mount RC40 mower deck, 44" mid-mount 3-blade RC44 mower deck, 48" mid-mount 3-blade RC48 mower deck, 38" front-mount snowblower, 46" front-mount snowblower, and 46" front-mount blade.

Diesel Engine Troubleshooting
Engine will not start or hard to start
Fuel filter is clogged - Service the filter
No fuel supply from the tank - Open the fuel supply valve
Air in fuel system - Air-bleed fuel system
Fuel injectors are damaged or dirty - Change fuel injectors
Fuel injection pump malfunctioning - Change or repair the pump
Low engine compression - Check and change damaged parts
Engine stalls during operation
Engine is not warmed up to required temperature - Warm up the engine as required
Air trapped in fuel system - Bleed air
Fuel injection failed - Use correct settings
Plugged fuel filter - Replace filter element
Dirty or damaged injectors - Test fuel injectors and change if necessary
Engine starts but then shuts off
Fuel injection pump out of timing - Adjust injection timing
Fuel filter is dirty - Clean the filter or install new filter element
Fuel injector nozzles are faulty - Test injector nozzles and replace as required
Fuel injection pump is faulty - Install a new pump or rebuild
Air cleaner is clogged - Clean or replace the air cleaner element
Engine stops when idling
Low idle speed setting is not correct - Normalize low idle speed
Fuel injection pump malfunctioning - Repair or install a new fuel pump
Fuel injector nozzles are faulty - Install new set of properly balanced nozzles
Incorrect valve clearance - Need to adjust valve clearance
Engine overheats
Low coolant level - Top up coolant. Check radiator and hoses for leaks
Cooling system is dirty or cooling components are damaged - Change faulty components or flush cooling system
Engine oil level low - Fill up the oil to required level
Fan belt tension is unadjusted or belt is worn - Change or adjust belt tension correctly
Thermostat failure - Check and change if necessary
Engine power is too low
Fuel injectors are clogged or faulty - Check fuel injectors and replace if required
Fuel injection pressure is incorrect - Correct the pressure settings
Air filter element is dirty - Air filter maintenance required
Dirty oil filter - Change or clean engine oil filter element
Engine is running overloaded - Reduce the load or operate the tractor in lower gears
Incorrect valve clearance - Adjust valve clearance
Incorrect low idle speed adjustment - Correct low idle settings
Fuel pipes or hoses are dirty - Clean fuel hoses and pipes
Engine lost compression: Valves are defective or worn - Install new valves
Abnormal engine knocking or noise
Fuel injection pump out of timing - Adjust injection timing
Fuel injector nozzles are damaged or dirty - Service or replace injector nozzles
Engine oil level is low - Fill up the oil to required level
Engine is cold - Warm up the engine to required temperature
Main bearings or crankshaft wear - Need to install new components
Piston rings failure - Piston rings need to be replaced
The flywheel to crankshaft bolts are loose - Tighten bolts as required
Diesel engine consuming too much oil
Oil leaks: Seals or gaskets are defective - New components need to be installed
Incorrect oil viscosity - Use oil of proper viscosity
Piston rings are stuck or worn - Piston rings replacement required
Worn valve stems and valve guides - Install new valves
Cylinder liners or pistons are scuffed - Inspect pistons and liners, replace as required

Hydrostatic Transmission Troubleshooting
Excessive HST transmission noise
Speed control linkage is worn or unadjusted - Adjust or replace linkage
Excessive transmission load - Reduce the load is required
Transmission oil is contaminated or oil level is insufficient - Add oil to proper level or pour fresh transmission oil
Defective or worn transmission parts - Check transmission parts for defect or damage and change if necessary
Hard shifting
Shift linkage is stuck or worn - Clean or replace linkage
Worn or seized hydrostatic pump - Change or repair pump
Faulty or misadjusted transmission shift control parts - Change or adjust correctly
Power is too low
Transmission fluid level is low - Add fluid to the transmission housing
Worn or damaged drive sheave - Change sheave
Not adjusted or damaged shifter linkage - Change or adjust linkage
Worn or unadjusted speed control linkage - Repair or adjust linkage
Transmission leakage
Damaged transmission seals or gaskets - Change seals or gaskets
Final drive shaft is leaking - Shaft seals need to be changed
Cracked transmission housing - Replace damage housing or transmission assembly

Mower Deck Troubleshooting
Mower vibrates too much
Drive pulley of mower deck is damaged or dirty - Service or replace pulley
Drive belt is damaged or loose - Replace belt or adjust belt tension
Unbalanced or warped cutting blades - Balance or change as needed
Blade mounting bolts are loose - Tighten it fast
Discharge chute keeps clogging
Ground speed is too fast - Select a slower speed
Tall grass - Need to set low cutting height
Engine rpm is too low - Adjust throttle to full opening
Low cutting height - Change cutting height adjustment
Mower drive belt installation is improper - Drive belt must be installed correctly
Uncut grass when mowing
Discharge chute is plugged - Need to clean the mower deck
Not sharp blades - Need to sharpen the blades
Blades are defective or worn - Change the blades
High mowing speed - Select a slower speed
Mower deck set to low cutting - Use correct cutting height
Grass bag is full - Remove grass from bag
Blades scalp the grass
Lawn is not level or bumpy - Level the lawn
Cutting level is too low - Need to set high cutting height
High ground speed - Use a slower speed
Deck is not leveled correctly - Level the deck correctly
Blades are bent or worn - Replace the blades
Incorrect tire pressure - Correct tire pressure
Mower cuts uneven
Tires are not properly inflated - Check and inflate the tires
Mower deck is not leveled properly - Deck needs to be adjusted properly
Excessive blade dullness - Need a blade sharpening
Bent or worn blades - Install new blades
Cutting deck is clogged - Check cutting deck and clean as necessary
Damaged mower deck shell - Replace or repair the deck
Loose or defective mower spindle - Replace or repair the spindle

Electrical Troubleshooting
Battery is not charging
Electrical cable connections are corroded or loose - Service or tighten connections
Defective battery terminal clamps - Terminal clamps need to be replaced
Bad cell in battery - Use a new battery
Starter turning slow
Low battery output - Battery is drained, recharge it
Battery drains quickly - Service or change the battery
Disconnected battery cables or bad terminals - Check cable connections and replace or service terminals
Starter will not crank
Battery is low or faulty - Charge or change the battery
Wiring is improperly connected or disconnected - Check wiring and connect properly
Battery power is low - Battery needs to be recharged
Faulty or incorrectly gapped spark plug - Clean, gap or replace spark plug
Starter motor or solenoid is defective - Repair starter or install a new solenoid



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