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Kubota GR2020 Troubleshooting
The
Kubota GR2020 is a 4WD (4x4) garden tractor from GR-series. This model was
manufactured between 2010 and 2019. The Kubota GR2020 powerline system
components: Kubota GH630 2-cylinder air-cooled gasoline engine and hydrostatic
transmission with foot travel speed control and cruise control.
A 38.1 cubic inches (624 cc) engine has a cylinder bore of 3.03" (77
mm), piston stroke of 2.64" (67 mm), and rated power of 20.5 hp (15.3
kW). Max. forward speed - 6.2 mph (10 km/h), maximum reverse speed - 3.1
mph (5 km/h). The tractor is fitted with 16x7.50-8 front tires and
23x10.50-12 rear tires.
The wheelbase is 50.4 in (1280 mm). Compatible attachments for the
Kubota GR2020 garden tractor: a 48" mid-mount 3-blade mower deck with
cutting height of 1.0-4.0 in (25-101) and hydraulic lift, 48"
front-mount Kubota GR2707 snowblower, and 46" front-mount Kubota GR2707
blade.
| Engine Troubleshooting |
| Engine is not starting or hard starting |
| Fuel tank is empty - Fill fuel up |
| Incorrect fuel grade - Use quality gasoline |
| Dirty fuel lines - Inspect and clean |
| Spark plug wire is loose or disconnected - Inspect the spark plug wire connection, replace or repair |
| Defective spark plug - Spark plug need to be replaced |
| Fuel filter is clogged - Replace fuel filter |
| Safety contact for brake pedal defective - Install new part |
| Carburetor is not working properly - Inspect and adjust |
| Low engine compression - Inspect cylinder block and change defective components |
| Throttle cable is damaged or adjusted incorrectly - Adjust properly or replace the cable |
| Air intake screen is blocked - Clean and wash as required |
| Ignition system is defective - Test ignition and replace failed parts |
| Choke cable is stuck or defective - Service or replace the cable |
| Air filter element is clogged - Clean or change air filter |
| Dirty or damaged fuel pump - Check fuel pump and replace if necessary |
| Engine starts and stalls suddenly |
| Spark plug is defective - Install new spark plug |
| Dirty or faulty carburetor - Service or replace carburetor |
| Ignition coil is defective - Install a new ignition coil |
| Valve springs are broken or bad - Install new valve springs |
| Valves sticking - Valves must be cleaned |
| Lack of engine oil - Checking oil level and add if necessary |
| Engine is running overloaded - Reduce load |
| Plugged cooling fins - Clean and wash as required |
| Carburetor is running lean - Set the carburetor properly |
| Ignition timing is improper - Ignition timing needs to be set properly |
| Valve setting is improper - Set the valves correctly |
| Abnormal engine noise or knocking |
| Low octane gasoline - Use proper fuel |
| Engine is overloaded - Reduce load |
| Engine oil level is insufficient - Check oil level and add oil as required |
| Too low idle RPM - Adjust as required |
| Fuel pump is defective or dirty - Check fuel pump and replace if necessary |
| Main bearings or crankshaft wear - Replace crankshaft or bearings |
| Valve clearance is incorrect - Adjustment procedure required |
| Cylinder bore or piston rings are damaged - Replace defective components |
| Incorrectly adjusted or clogged carburetor - Service or properly adjust carburetor |
| Air filter is dirty - Replace or clean air filter |
| Fuel pump is dirty or defective - Check fuel pump and replace if necessary |
| Ignition system malfunction - Inspect ignition system and change faulty parts |
| Blown cylinder head gasket - Cylinder-head gasket replacement required |
| Valves are stuck or burned - Clean or change valves |
| Bent or worn push rod - Push rod needs to be changed |
| Cylinder block parts are faulty - Replace defective components as required |
| Choke is not fully open - Check choke cable and adjust it |
| Carburetor main jet adjustment is improper - Adjust it properly |
| Spark plug is loose or defective - Change or re-tighten spark plug |
| Stuck, burned, or worn valves - Clean or change valves |
| Worn rings, piston, or sleeve - Replace faulty components |
| Valve clearance is incorrect - Adjust valve clearance |
| Engine using too much oil |
| Gaskets or seals may be damaged - Replace defective parts |
| Damaged valve guides or valve stems - Valves need to be changed |
| Damaged or seized piston rings - Change piston rings |
| Damaged piston or cylinder liner - Check liner and piston, change as required |
| Breather hose or pipe is blocked - Clean or change |
| Hydrostatic Transmission Troubleshooting |
| HST transmission is making noise |
| Bent or unadjusted speed control pedal linkage - Adjust or replace linkage |
| Transmission is under excessive load - Load needs to be reduced |
| Fluid is contaminated or fluid level is insufficient - Pour fresh fluid or add transmission fluid to proper level |
| Transmission components are damaged or worn - Check transmission components and change if necessary |
| Shift linkage is corroded or worn - Lubricate or replace linkage |
| Worn or seized hydrostatic pump - Repair or change pump |
| Faulty or misadjusted transmission shift control parts - Replace or adjust as required |
| Low oil level - Fill the transmission housing with oil |
| Drive pulley is worn or faulty - Change pulley |
| Shifter linkage is faulty or not adjusted - Change or adjust linkage |
| Bent or unadjusted speed control pedal linkage - Replace or adjust linkage |
| Transmission gaskets or seals are worn - Replace seals or gaskets |
| Leaking final drive shaft - Change shaft seals |
| Cracked transmission case - Change broken case |
| Mower Deck Troubleshooting |
| Mower vibrates too much |
| Clogged or damaged mower drive sheave - Clean or replace sheave |
| Defective or loose drive belt - Belt needs to be adjusted or replaced |
| Mower blades are warped or not balanced - Change or balance blades |
| Loose blade mounting bolts - Bolts need to be tightened |
| Discharge chute is constantly plugged |
| Ground speed is too fast - Use a lower speed |
| Tall grass - Need to set low cutting height |
| Engine runs at low revs - Adjust throttle to full opening |
| Cutting level is too low - Must be set to high cutting height |
| Improper drive belt installation - Install drive belt correctly |
| Mower deck is clogged - Clean out the mower deck |
| Not sharp blades - Need a blade sharpening |
| Blades are defective or worn - Install new blades |
| Fast mowing speed - Need to slow down |
| Mower cuts too low - Must be set to high cutting height |
| Full bagger - Remove grass from bagger |
| Lawn is uneven or bumpy - Roll or level the lawn |
| Cutting level is too low - Raise the cutting height |
| Fast ground speed - Use a lower speed |
| Mower deck is not leveled properly - Adjust mower deck level properly |
| Blades are bent or worn - Replace the blades |
| Incorrect tire pressure - Inflate tires correctly |
| Tires are not correctly 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 |
| Damaged or worn blades - Replace the blades |
| Cutting deck clogging - Check cutting deck and clean as necessary |
| Deck shell is damaged - Replace or repair the deck |
| Mower spindle is faulty or loose - Replace or repair the spindle |
| Electrical Troubleshooting |
| Battery cannot be charged |
| Corroded or loose electrical wire connections - Clean or tighten wiring connections |
| Defective battery terminal connectors - Replace terminal connectors |
| Faulty cell in battery - Use a new battery |
| Battery voltage is low - Battery needs to be recharged |
| Battery won’t hold charge - Service battery or replace it |
| Bad battery terminals or disconnected wiring - Check wiring connections and replace or clean terminals |
| Battery is low or faulty - Battery needs to be recharged or replaced |
| Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required |
| Low battery power - Recharge the battery |
| Improperly gapped or dirty spark plug - Clean, gap or replace spark plug |
| Solenoid or starter motor failure - Change solenoid or repair starter |
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| Lawn and Garden Tractors Technical Specs |
