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Kubota G1900 Troubleshooting
The
Kubota G1900 garden tractor was manufactured from 1989 to 2000. The Kubota G1900
is powered by Kubota D722 vertical thee-cylinder indirect injection
liquid-cooled diesel engine with a rated power of 18.8 Hp (14 kW) at 3800 rpm.
The engine has a Bosch MD mini fuel injection pump and forced
lubrication by trochoid pump. The tractor is equipped with a hydrostatic
transmission with travel speed control. The maximum travel speed
(forward and reverse): 8.1 mph (13 km/h) / 3.7 (6 km/h).
The garden tractor was equipped with a hydrostatic steering system with
2-wheel steer (G1900) or 4-wheel steer (G1900S), 16x6.50-8 front tires,
and 23x8.50-12 rear tires. The wheelbase is 51" (1290 mm). The Kubota
G1900 is compatible with the following attachments: a 48" mid-mount
3-blade mower deck with cutting height of 1.4-3.5" (35-80 mm), 54", 60"
mid-mount 3-blade mower decks with cutting height of 1.5-4.0" (38-102
mm), and 48" front blade.
| Diesel Engine Troubleshooting |
| Engine won't start or difficult to start |
| Fuel filter is clogged - Replace filter element |
| No fuel injection - Open fuel cock to inject fuel |
| Air in fuel lines - Bleed fuel lines |
| Fuel injectors are clogged or faulty - Service or change fuel injectors |
| Fuel injection pump malfunctioning - Rebuild or replace pump |
| Poor engine compression - Inspect cylinder block and change worn parts |
| Engine shuts off unexpectedly during operation |
| Engine is not fully warmed up - Normalize the temperature by warming up the engine |
| Fuel lines leaking air - Tighten clamps, change faulty pipes |
| Irregular fuel injection - Adjust fuel injection timing |
| Plugged fuel filter - Change the filter element |
| Clogged or damaged injectors - Check fuel injectors and replace if required |
| Engine starts and stalls immediately |
| Fuel injection pump out of timing - Check and correct settings |
| Dirty fuel filter element - Install new filter element |
| Clogged or defective injector nozzles - Change injector nozzles |
| Fuel injection pump is damaged - Change pump or rebuild it |
| Dirty air cleaner element - Replace cleaner or install new cleaner element |
| Incorrect low idle setting - Adjust low idling as recommended |
| Defective fuel injection pump - Change or repair the pump |
| Clogged or defective injector nozzles - Replace fuel injector nozzles |
| Improper valve clearance - Adjust valve clearance |
| Lack of engine coolant - The cooling system needs to be refilled. Check for leaks or other malfunctions |
| Cooling system components are failed or system is clogged - Change faulty components or service cooling system |
| Engine oil level is low - Check oil level and add oil as required |
| Broken fan belt or unadjusted belt tension - Adjust correctly or replace the belt |
| Defective thermostat - Check and replace if required |
| Dirty or damaged injectors - Inspect fuel injectors and replace if necessary |
| Improper fuel injection pressure - Test fuel injection pressure and adjust it correctly |
| Dirty air filter - Change or replace air filter element |
| Oil filter is dirty - Replace or service engine oil filter |
| Diesel engine is overloaded - Change to lower gear or reduce load |
| Incorrect valve clearance - Adjust to proper valve clearance |
| Low idle speed setting is incorrect - Adjustment required |
| Fuel pipes or hoses clogging - Clean fuel system hoses and pipes |
| Low engine compression: Inlet or outlet valves are defective - Replace the valves |
| Abnormal engine knocking or noise |
| Fuel injection pump out of timing - Check the fuel injection pump timing setting |
| Fuel injector nozzles are damaged or dirty - Test injector nozzles and replace as required |
| Engine oil insufficient - Checking oil level and add if necessary |
| Engine is not fully warmed up - Warm up the engine to required temperature |
| Main bearings or crankshaft are worn out - Need to install new components |
| Piston rings are damaged or broken - Have piston rings replaced |
| Loose flywheel bolts - Inspect flywheel bolts and tighten properly |
| Excessive engine oil consumption |
| Oil leakage: Defective seals or gaskets - Replace to repair leaks |
| Incorrect oil viscosity - Use proper viscosity oil |
| Piston rings are stuck or worn - Change the piston rings as required |
| Worn valve stems and valve guides - Valves need to be changed |
| Cylinder liners or pistons are worn - Inspect pistons and liners, change as required |
| Hydrostatic Transmission Troubleshooting |
| Excessive HST transmission noise |
| Worn or out of adjustment speed control linkage - Change or adjust linkage |
| Transmission is under excessive load - Reduce the load is required |
| Dirty transmission fluid or insufficient fluid level - Fill to required level or change the fluid |
| Transmission components are damaged or worn - After disassembly and inspection, replace defective components |
| Loose or broken shift linkage - Change defective linkage |
| Hydrostatic pump is faulty or seized - Change or repair pump |
| Transmission shift control parts are damaged or misadjusted - Adjust correctly or replace |
| Insufficient transmission fluid - Fill the transmission housing to proper fluid level |
| Defective or worn drive sheave - Change sheave |
| Shifter linkage is faulty or not adjusted - Change or adjust linkage |
| Bent or unadjusted speed control pedal linkage - Change or adjust linkage |
| Damaged transmission seals or gaskets - Replace gaskets or seals |
| Leaking final drive shaft - Change shaft seals |
| Cracked transmission case - Change broken case |
| Mower Deck Troubleshooting |
| Mower vibrates too much |
| Worn or dirty mower drive pulley - Service or change pulley |
| Drive belt is defective or loose - Change belt or adjust belt tension |
| Cutting blades are bent or unbalanced - Change or balance blades |
| Loose blade mounting bolts - Bolts should be tightened |
| Constant clogging of discharge chute |
| Fast ground speed - Use a lower speed |
| Tall grass - Use a lower cutting height |
| Engine is running at too low speed - Adjust carburetor to higher rpm |
| Cutting level is too low - Use a higher cutting height |
| Incorrect mower drive belt installation - Check drive belt for correct installation |
| Lawn mower leaving uncut grass |
| Discharge area is clogged - Need to clean the mower deck |
| Blades are not sharp - Need a blade sharpening |
| Damaged or worn blades - Replace the blades |
| High ground speed - Need to slow down |
| Cutting height is too low - Must be set to high cutting height |
| Filled bagger - Bagger must be empty |
| Bumpy or not smooth lawn - Lawn needs to be leveled |
| Low cutting height - Change cutting height adjustment |
| High ground speed - Use a slower speed |
| Mower deck is not leveled properly - Adjust mower deck level properly |
| Blades are bent or worn - Blades need to be replaced |
| Tires are not properly inflated - Inflate tires correctly |
| Tires are not correctly inflated - Correct tire pressure |
| Incorrectly leveled mower deck - Level the deck properly |
| Not sharp blades - Need a blade sharpening |
| Bent or worn blades - Blades must be changed |
| Deck is plugged with grass - Clean out the mower deck |
| Damaged mower deck shell - Replace or repair the deck |
| Loose or faulty mower spindle - Spindle needs to be repaired or replaced |
| Electrical Troubleshooting |
| Battery is not charging |
| Electrical wire connections are corroded or loose Tighten or service cable connections |
| Defective battery terminal connectors - Terminal connectors need to be changed |
| Bad cell in battery - Install a new battery |
| Low battery power - Battery is drained, recharge it |
| Battery won’t hold charge - Battery needs service or replacement |
| Disconnected cables or faulty battery terminals - Check wiring connections and replace or clean terminals |
| Battery is discharged or defective - Recharge or replace battery |
| Battery cables are disconnected or incorrectly connected - Check cables and connect as needed |
| Low battery output - Battery is drained, recharge it |
| Spark plug gapped improperly or faulty - Clean, gap or replace spark plug |
| Damaged starter motor or solenoid - Replace solenoid or repair starter |
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| Lawn and Garden Tractors Technical Specs |
