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Kubota GR2120 Troubleshooting
The
Kubota GR2120 is a two-wheel drive garden tractor from GR-series. This model was
manufactured between 2010 and 2018. The Kubota GR2120 powertrain system
components: Kubota D782 four cycle vertical 3-cylinder water-cooled diesel
engine and shaft-drive hydrostatic transmission with a single foot pedal and
standard cruise control.
A 47.5 cu.in (0.78 L) engine power rating is 18.1 hp (13.5 kW) at 3000
rev/min. The maximum forward speed - 6.2 mph (10 km/h), a maximum
reverse speed - 3.1 mph (5 km/h).
The Kubota GR2120 garden tractor fitted with 16x7.50-8 front tires and
23x10.5-12 rear tires. The wheelbase is 50.4 inches (1280 mm). The
tractor can be equipped with the following attachments: 48" and 54"
mid-mount mower decks with cutting height of 1.0-4.0 inches (25-102 mm),
46" front-mount snow blower, and 48" front blade with manual lift.
| Diesel Engine Troubleshooting |
| Engine won't start or starts hard |
| Fuel filter is dirty - Install new filter element |
| Closed fuel supply valve - Open supply valve to inject fuel |
| Water, dirt, or air in fuel system - Drain, flush, fill, and bleed system |
| Clogged or damaged injectors - Clean or replace fuel injectors |
| Damaged fuel injection pump - Replace or repair injection pump |
| Poor engine compression - Inspect cylinder block and change defective components |
| Engine stops during operation |
| Engine has not warmed up to required temperature - Warm up the engine as required |
| There is air in the fuel system - Bleed the system |
| Irregular fuel injection - Adjust fuel injection timing |
| Dirty fuel filter element - Service or replace the filter |
| Clogged or damaged injectors - Inspect fuel injectors and replace if necessary |
| Fuel injection pump out of timing - Adjust injection timing |
| Fuel filter plugging - Change the filter element |
| Fuel injector nozzles are dirty - Change injector nozzles |
| Fuel injection pump is not working correctly - Rebuild or replace pump |
| Air cleaner element is clogged - Change or replace air cleaner element |
| Incorrectly set low idle speed - Correct the settings |
| Defective fuel injection pump - Repair or replace injection pump |
| Clogged or damaged injector nozzles - Inspect injector nozzles and change if required |
| Valve clearance is wrong - Need to adjust valve clearance |
| Not enough coolant - Top up coolant. Check for coolant leaks |
| Cooling system parts are defective or system is dirty - Flush cooling system or replace faulty parts |
| Lack of engine oil - Check oil level and add oil as required |
| Fan belt is damaged or belt tension is incorrect - Adjust belt tension correctly or change it |
| Thermostat fault - Replace the thermostat |
| Dirty or damaged injectors - Service or change fuel injectors |
| Incorrect fuel injection pressure - Repair or replace injection pump |
| Air filter element is clogged - Air filter maintenance required |
| Dirty oil filter element - Clean or replace engine oil filter element |
| Engine is running overloaded - Reduce the load or use a lower gear |
| Excessive valve clearance - Check and adjust as required |
| Incorrect low idle setting - Correct the settings |
| Restricted fuel hoses or pipes - Service fuel pipes and hoses |
| Engine compression too low: Leaking or faulty valves - Replace the valves |
| Fuel injection pump timing is incorrect - Fuel pump timing settings need to be corrected |
| Damaged or clogged injector nozzles - Service or replace nozzles if required |
| Engine oil level is insufficient - Check and refill engine oil |
| Coolant temperature is low - Warm up the engine |
| Main bearings or crankshaft failure - Crankshaft or bearings need to be replaced |
| Piston rings are damaged or broken - Have piston rings replaced |
| The flywheel to crankshaft bolts are loose - Tighten bolts as required |
| Engine using too much oil |
| Oil leakage: Damaged gaskets or seals - Replace to repair leaks |
| Crankcase oil too light - Fill up with the correct oil viscosity |
| Piston rings are seized or worn - Change the piston rings as required |
| Valve guides and stems are worn - Need to replace the valves |
| Worn cylinder liners or pistons - Inspect pistons and liners, fit new components as necessary |
| Hydrostatic Transmission Troubleshooting |
| HST transmission noises |
| Worn or unadjusted speed control linkage - Change or adjust linkage |
| Transmission overload - The load should be reduced |
| Dirty transmission fluid or insufficient fluid level - Top up to proper level or change transmission fluid |
| Transmission components are damaged or worn - Change or repair defective parts |
| Stuck or worn shift linkage - Linkage need to be replaced |
| Defective or stuck hydrostatic pump - Change or repair pump |
| Unadjusted or damaged transmission shift control parts - Replace or adjust as required |
| Lack of transmission fluid - Check and refill the transmission fluid |
| Drive pulley is damaged or worn - Install a new pulley |
| Shift linkage is damaged or unadjusted - Change or adjust linkage |
| Speed control pedal linkage is bent or not adjusted - Repair or adjust linkage |
| Transmission gaskets or seals are damaged - Change seals or gaskets |
| Final drive shaft leaks - Change shaft seals |
| Transmission case is cracked - Change broken case |
| Mower Deck Troubleshooting |
| Mower vibrates excessively |
| Mower deck drive sheave is clogged or worn - Change or clean sheave |
| Worn or loose drive belt - Adjust belt tension or install a new belt |
| Not balanced or bent mower blades - Change or balance blades |
| Blade bolts are not tightened well - Bolts need to be tightened |
| Constant clogging of discharge chute |
| High mowing speed - Operate at slower speed |
| Tall grass - Adjust mower to lower cutting height |
| Reduced engine rpm - Throttle is not fully open |
| Mower deck set to low cutting - Use a higher cutting height |
| Improper drive belt installation - Reinstall drive belt properly |
| Lawn mower leaving uncut grass |
| Cutting deck is clogged - Inspect and clean cutting deck |
| Blades are excessively dull - Sharpen the blades |
| Worn or damaged blades - Change the blades |
| High ground speed - Need to slow down |
| Cutting level is too low - Adjust mower to higher cutting height |
| Filled grass bag - Empty the grass bag |
| Uneven or bumpy lawn - Roll or level the lawn |
| Low cutting height - Use correct cutting height |
| Mowing speed is too high - Operate at slower speed |
| Incorrect level of mower deck - Adjust mower deck level properly |
| Blades are bent or worn - Replace the blades |
| Low tire inflation - Need to inflate tires |
| Tire pressure is too low - Inflate tires correctly |
| Deck level is not correct - Adjust the level of mower deck correctly |
| Blades are too dull - Sharpen the blades |
| Bent or worn blades - Install new blades |
| Discharge chute is plugged - Clean out the mower deck |
| Deck shell is broken - Replace or repair the deck |
| Loose or defective mower spindle - Install new spindle or repair it |
| Electrical Troubleshooting |
| Battery will not charge |
| Loose or corroded wire connections - Service or tighten connections |
| Defective battery terminal clamps - Change terminal clamps |
| Defective battery - Battery replacement required |
| Battery voltage is low - Battery is drained, charge it |
| Battery is draining quickly - Service or replace the battery |
| Bad terminals or disconnected battery cables - Check wiring connections and replace or clean terminals |
| Battery is discharged or worn - Recharge or replace battery |
| Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required |
| Low battery capacity - Battery needs to be recharged |
| Faulty or incorrectly gapped spark plug - Clean, gap or change spark plug |
| Starter motor or solenoid is defective - Starter/solenoid needs to be replaced |
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| Lawn and Garden Tractors Technical Specs |
