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John Deere D100 Troubleshooting

The John Deere D100 is a two-wheel drive lawn tractor. This model was manufactured from 2011 to 2012.

The components of John Deere D100 driveline system: Briggs and Stratton Intek 31G777 Intek 4-cycle 1-cylinder OHV vertical shaft air-cooled gasoline engine with a rated power of 17.5 Hp (13 kW), and Dana 4360 belt-driven gear transmission with 5 forward and 1 reverse gears. The engine has a float type carburetor, lubrication system with oil pump and filter, and electronic ignition system.

The maximum forward speed - 5 mph (8 km/h), maximum reverse speed - 2.3 mph (3.7 km/h). The tractor is fitted with 15x6.00-6 front tires and 20x8.00-8 rear tires. The wheelbase is 49" (1240 mm). The John Deere D100 can be equipped with the following attachments: a 42" mid-mount 2-blade mower deck with a 13 cut positions and manual spring-assist lifting, 46" front blade, and 43.25" front-mount dual-stage snow blower with mechanical lift.

Engine Troubleshooting
Engine hard to start or doesn't start
No gasoline in tank - Add gasoline
Low-quality gasoline - Use correct fuel grade
Air in fuel system - Bleed fuel system
Spark plug wire is disconnected or loose - Check spark plug wiring connection, repair or change
Defective spark plug - Install new spark plug
Dirty fuel filter - Install new filter
Brake pedal not depressed - Press the brake pedal
Problems with carburetor adjustment - Adjust as required
Poor cylinder compression - Check cylinder block and change worn parts
Unadjusted or worn throttle cable - Replace cable or adjust properly
Irregular engine running
Cooling fins are plugged - Need to wash or clean
Defective ignition system - Inspect ignition system and change failed components
Defective or stuck choke cable - Change or clean the cable
Plugged air filter - Change or clean air filter
Clogged or defective fuel pump - Check fuel pump and change if required
Engine starts but stalls suddenly
Spark plug is damaged - Replace spark plug
Defective or dirty carburetor - Replace or service carburetor
Ignition coil is defective - Install a new ignition coil
Valve springs are loose or broken - Install new valve springs
Stuck valves - Valves must be cleaned
Engine keeps overheating
Not enough engine oil - Add oil to the engine crankcase
Engine overloaded - Reduce engine load
Plugged cooling fins - Need to clean or wash
Carburetor is running lean - Set the carburetor properly
Wrong ignition timing - Adjust ignition timing as required
Valve setting is improper - Valves needs to be adjusted properly
Engine knocking or noise
Stale gasoline - Use proper fuel
Engine is running overloaded - Load reducing is recommended
Insufficient engine oil - Fill up the oil to required level
Wrong adjustment of low idle speed - Correct the settings
Clogged or defective fuel pump - Clean or replace fuel pump
Crankshaft or main bearings are worn out - Crankshaft or bearings need to be replaced
Excessive valve clearance - Need to adjust valve clearance
Damaged cylinder bore or piston rings - Change defective parts
Engine power is insufficient
Dirty or improperly adjusted carburetor - Adjust carburetor properly or service it
Air filter element is plugged - Service or change air filter
Dirty or faulty fuel pump - Service or change fuel pump
Ignition system malfunction - Inspect ignition system and change failed components
Worn cylinder head gasket - Replace the head gasket
Valves are burned or stuck - Change or clean valves
Worn or bent push rod - Install a new push rod
Faulty cylinder block parts - Replace defective components
High fuel consumption
Throttle opening is not full - Adjust or change throttle cable
Carburetor main jet adjustment is incorrect - Adjust the carburetor main jet correctly
Loose or defective spark plug - Spark plug need to be tightened or replaced
Valves are stuck, burned, or worn - Replace or clean valves
Rings, sleeve, or piston are damaged - Replace defective parts as required
Valve clearance is wrong - Adjustment procedure required
Excessive engine oil consumption
Worn seals or gaskets - New components need to be installed
Valve guides and stems are worn - Change the valves
Piston rings are stuck or broken - Change the piston rings as required
Piston or cylinder liner is damaged - Inspect piston and liner, replace as required
Clogged breather pipe or hose - Change or clean

Transmission Troubleshooting
Hard shifting
Worn or rusty gear shift linkage - Install new shift linkage
Damaged or worn shift forks - Change the shift forks
Defective gearshift mechanism - Replace defective components
Transmission makes noise
Low transmission fluid level - Add fluid to the transmission housing
Transmission oil is contaminated - Fill up with fresh transmission oil
Bearings are damaged or gears are worn - Replace bearings or gears
Transmission jumping out of gear
Incorrectly installed or bent shift lever - Reinstall the lever properly or change it
Damaged or worn gears - Change defective gears
Faulty shift rods or shift forks - Replace defective forks or rods
Transmission slipping
Drive shaft/belt is damaged or improperly adjusted - Adjust belt/shaft or install a new one
Defective brake/clutch or incorrect brake/clutch adjustment - Adjust clutch/brake or install a new one
Drive pulley is damaged or worn - Install a new pulley

Mower Deck Troubleshooting
Mower vibrates excessively
Mower deck drive pulley is worn or dirty - Change or clean pulley
Drive belt is worn or loose - Replace belt or adjust belt tension
Warped or not balanced mower blades - Balance or replace blades
Loose blade bolts tightening - Bolts should be tightened
Discharge chute regular clogging
Fast mowing speed - Operate at slower speed
Grass is too long - Use a lower cutting height
Reduced engine speeds - Adjust throttle to full opening
Cutting height is too low - Need to set high cutting height
Mower deck drive belt installed incorrectly - Install drive belt as required
Grass patches are not cut
Deck clogged with grass clippings - Check cutting deck and clean as necessary
Blades are too dull - Need to sharpen the blades
Worn or damaged blades - Blades must be changed
Fast ground speed - Need to slow down
Cutting height is too low - Must be set to high cutting height
Grass bag is overfilled - Grass bag must be empty
Blades are scalping the grass
Lawn is not level or bumpy - Roll or level the lawn
Cutting level is too low - Raise the cutting height
High mowing speed - Select a lower speed
Mower deck is not leveled properly - Adjust the level of mower deck correctly
Blades are worn or bent - Blades must be changed
Tires are not properly inflated - Inflate tires as required
Mower deck to cut unevenly
Tires are not correctly inflated - Inflate tires as required
Improper mower deck level - Adjust the level of mower deck correctly
Blades are excessively dull - Need to sharpen the blades
Worn or defective blades - Blades must be changed
Cutting deck clogging - Need to clean the mower deck
Broken mower deck housing - Repair or change the deck
Mower spindle is bent or loose - Replace or repair the spindle

Electrical Troubleshooting
Battery will not charge
Electrical cable connections are loose or corroded - Service or tighten cable connections
Defective battery terminal connectors - Change terminal connectors
Dead cell in battery - Battery change required
Starter cranks slow
Low battery power - Recharge the battery
Battery won’t hold charge - Service or replace the battery
Disconnected wiring or bad battery terminals - Check cables and clean or change terminals
Starter is not working
Battery is discharged or defective - Recharge or change battery
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required
Low battery output voltage - Low battery charging, charge as required
Spark plug faulty or incorrectly gapped - Replace or clean and gap
Defective solenoid or starter motor - Starter/solenoid needs to be replaced




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