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John Deere L100 Troubleshooting

The John Deere L100 lawn tractor was manufactured between 2003 and 2005. The John Deere L100 driveline system components: a 30.6 cu.in (501 cc) Briggs and Stratton 31F707 4-cycle single cylinder OHV air-cooled gasoline engine with a rated power of 17 hp (12.7 kW), and Dana 4360 belt-driven gear transmission with 5 forward and 1 reverse gears.

The engine has a float type carburetor, pulse type fuel pump, and full pressure lubrication system including oil pump with filter. The maximum forward speed - 5 mph (8 km/h), maximum reverse speed - 2.3 mph (3.7 km/h).

The John Deere L100 is equipped with a manual steering system, wet disc brakes, 15x6.00-6 front tires, and 20x8.00-8 rear tires. The wheelbase is 49" (1240 mm). The tractor is compatible with the following attachments: a 42" mid-mount 2-blade mower deck with cutting height of 1.0-4.0" (25-102 mm) and manual lift system, 46" front blade with lift height of 6.5" (160 mm), and 42" front-mount 2-stage snowblower with clearing height of 21" (530 mm).

Engine Troubleshooting
Engine starts up hard or doesn't start
Fuel tank is empty - Fill fuel up
Wrong grade of gasoline - Use correct gasoline grade
Air in fuel tank - Bleed fuel tank
Defective wiring connection of spark plug - Check the spark plug wire connection, repair or replace
Faulty spark plug - Change spark plug as required
Clogged fuel filter - Replace fuel filter
Brake pedal not depressed - Press the brake pedal
Problems with carburetor adjustment - Adjust as required
Bad engine compression - Inspect cylinder block and replace worn components
Not adjusted or damaged throttle cable - Replace cable or adjust properly
Irregular engine running
Cooling fins are clogged - Need to wash or clean
Ignition system problems - Inspect ignition system and change faulty parts
Faulty or stuck choke cable - Change or service the cable
Air filter is dirty - Change or clean air filter
Dirty or faulty fuel pump - Test fuel pump and replace if necessary
Engine starts and then stalls
Faulty spark plug - Change spark plug as required
Clogged or faulty carburetor - Service or repair carburetor
Ignition coil is damaged - Ignition coil should be replaced
Valve springs are bad or broken - Change valve springs
Valves sticking - Clean the valves
Engine overheating
Engine oil insufficient - Fill up the engine oil
Engine is overloaded - Reduce engine load
Clogged cooling fins - Need to clean or wash
Too lean fuel mixture in carburetor - Make the correct settings
Wrong ignition timing - Ignition timing needs to be adjusted correctly
Valve setting is improper - Valves needs to be adjusted properly
Abnormal engine noise or knocking
Stale fuel - Change fuel
Engine is overloaded - Load reducing is recommended
Low engine oil level - Check and refill engine oil
Low idle speed set incorrectly - Correct idle settings
Clogged or damaged fuel pump - Service or replace fuel pump
Worn crankshaft or main bearings - Crankshaft or bearings need to be replaced
Improper valve clearance - Adjustment procedure required
Piston rings or cylinder bore are worn - Change defective components
Engine power loss
Clogged or improperly adjusted carburetor - Clean or correctly adjust carburetor
Air filter is dirty - Clean or change air filter
Fuel pump is clogged or faulty - Service or change fuel pump
Ignition system is defective - Inspect ignition system and change failed components
Damaged cylinder-head gasket - Cylinder-head gasket replacement required
Burned or stuck valves - Clean or replace valves
Push rod is bent or worn - Change push rod
Cylinder block parts are faulty - Change defective parts
Engine uses too much fuel
Insufficient throttle opening - Adjust or replace throttle cable
Incorrect adjustment of carburetor main jet - Adjust it properly
Spark plug is faulty or loose - Tighten or replace spark plug
Valves are worn, burned or stuck - Replace or service valves
Sleeve, piston, or rings are damaged - Change defective parts
Valve clearance is wrong - Need to adjust valve clearance
Engine oil consumption is too high
Gaskets or seals are excessively worn - Replace defective parts
Valve stems and guides are worn - Valves must be replaced
Worn or broken piston rings - Have piston rings replaced
Scored cylinder liner or piston - Inspect piston and liner, replace as required
Breather pipe or hose is clogged - Service or replace

Transmission Troubleshooting
Hard to shift gears
Loose or broken gear shift linkage - Change defective shift linkage
Damaged or worn shift forks - Replace defective shift forks
Faulty gear shifting mechanism - Faulty parts must be changed
Transmission makes excessive noise
Insufficient fluid supply - Fill the transmission housing with fluid
Transmission oil is contaminated - Fill up with fresh transmission oil
Gears or bearings are damaged - Change bearings or gears
Transmission pops out of gear
Improperly installed or bent gear shift lever - Change or install shift lever properly
Worn or damaged gear teeth - Replace defective gears
Worn shift rods or shift forks - Replace defective rods or forks
Transmission slipping
Drive shaft/belt is improperly adjusted or damaged - Adjust or replace belt/shaft
Incorrect clutch/brake adjustment or worn clutch/brake - Adjust or replace clutch/brake
Damaged or worn drive pulley - Install a new pulley

Mower Deck Troubleshooting
Excessive mower vibration
Damaged or clogged mower drive pulley - Change or clean pulley
Drive belt is worn or loose - Change belt or adjust belt tension
Cutting blades are bent or unbalanced - Balance blades or replace it
Blade mounting bolts are loose - Tighten it fast
Discharge chute keeps clogging
High mowing speed - Need to slow down
Tall grass - Must be set to low cutting height
Reduced engine rpm - Choke is not fully opening
Cutting height is too low - Use correct cutting height
Incorrect mower drive belt installation - Drive belt must be installed correctly
Uncut grass when mowing
Cutting deck clogging - Need to clean the mower deck
Blades are not sharp - Sharpen the blades
Worn or damaged blades - Blades need to be replaced
Fast ground speed - Use a slower speed
Cutting level is too low - Must be set to high cutting height
Filled grass bag - Remove grass from bag
Blades are scalping the grass
Uneven or bumpy lawn - Lawn leveling required
Mower deck cutting height is set too low - Use correct cutting height
High ground speed - Use a slower speed
Deck level is not correct - Level the deck properly
Blades are worn or bent - Change the blades
Low tire pressure - Inflate tires as required
Mower cutting is uneven
Tires are not properly inflated - Inflate tires as required
Improperly leveled mower deck - Adjust the level of mower deck correctly
Not sharp blades - Sharpen the blades
Blades are worn or damaged - Replace the blades
Clogged mower deck - Check cutting deck and clean as necessary
Deck housing is damaged - Replace or rebuild mower deck
Loose or faulty mower spindle - Repair or replace the spindle

Electrical Troubleshooting
Battery won’t charge
Loose or corroded electrical wiring connections - Tighten or clean connections
Faulty electrical terminal connectors - Install new terminal connectors
Dead cell in battery - Change the battery
Starter turns slowly
Low battery output - Battery needs to be recharged
Battery runs out quickly - Service charging system or change battery
Disconnected battery cables or bad terminals - Connect wiring correctly or install new terminals
Starter motor is not working
Battery is discharged or defective - Recharge or change battery
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly
Low battery capacity - Battery needs to be recharged
Spark plug worn or incorrectly gapped - Replace or clean and gap
Starter motor or solenoid is damaged - Repair starter or change solenoid




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