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John Deere L111 Troubleshooting

The John Deere L111 is a 2-wheel drive lawn tractor from L100 series. This model was manufactured between 2004 and 2006.

The John Deere L111 driveline components: a 40 cubic inches (656 cc) Briggs and Stratton 4-cycle V-twin cylinder OHV vertical-shaft air-cooled gasoline engine with a rated power of 20 Hp (14.8 kW), and Tuff Torq T40 belt-driven hydrostatic transmission with infinite forward and reverse gears.

The engine has a float-feed carburetor, full pressure lubrication, forced air cooling system, and electronic ignition system. Max. travel speed (forward and reverse): 5.5 mph (8.8 km/h) / 3.2 mph (5.1 km/h). The John Deere L111 was equipped with a manual steering system, disc brakes, 15x6.00-6 front tires, and 20x8.00-8 rear tires. The wheelbase is 49 inches (1240 mm).

The tractor is compatible with a 42" mid-mount 2-blade mower deck with cutting height of 1-4" (25-102 mm), seven cut positions, and mechanical lifting system.

Engine Troubleshooting
Engine starts up hard or will not start
Empty fuel tank - Fill fuel up
Low-quality gasoline - Use correct fuel grade
Fuel system clogged - Repair or replace
Spark plug wiring connection is defective - Inspect spark plug wiring connection, change or repair
Spark plug is defective - Change spark plug as required
Fuel filter is clogged - Replace fuel filter
Brake pedal not depressed - Press the brake pedal
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw
Engine has low compression - Check cylinder block and replace defective parts
Throttle cable is adjusted incorrectly or damaged - Change cable or adjust properly
Engine runs roughly
Air intake grill is clogged - Clean and wash as required
Ignition system malfunction - Inspect ignition system and change failed components
Stuck or faulty throttle cable - Change or clean the cable
Air filter element is clogged - Replace or service air filter
Fuel pump is damaged or dirty - Clean or replace fuel pump
Engine starts but then stops
Defective spark plug - Install new spark plug
Carburetor is faulty or clogged - Service or change carburetor
Ignition coil is damaged - Ignition coil must be replaced
Damaged or weak valve springs - New valve springs need to be installed
Valves sticking - Valves must be cleaned
Engine overheating
Engine oil level is insufficient - Check oil level and add oil as required
Engine overloaded - Reduce engine load
Cooling fins are blocked - Need to wash or clean
Carburetor is running lean - Adjust carburetor properly
Ignition timing is wrong - Adjust ignition timing correctly
Improper valve setting - Set the valves correctly
Engine noise or knocking
Low octane fuel - Change fuel
Engine is overloaded - Load reducing is recommended
Engine oil level is insufficient - Add oil to the engine crankcase
Too low idle RPM - Adjustment required
Clogged or damaged fuel pump - Clean or install new fuel pump
Worn crankshaft or main bearings - Repair or replace defective parts
Valve clearance is improper - Adjust to proper valve clearance
Damaged piston rings or cylinder bore - Change faulty parts
Lack of engine power
Incorrectly adjusted or clogged carburetor - Adjust the carburetor properly or clean it
Air filter element is clogged - Service or change air filter
Clogged or damaged fuel pump - Test fuel pump and replace if necessary
Ignition failure - Check ignition and replace faulty components
Defective cylinder head gasket - Install new head gasket
Valves are burned or stuck - Service or change valves
Worn or defective push rod - Install a new push rod
Faulty cylinder block parts - Replace defective parts
Engine uses too much fuel
Choke doesn't open well - Adjust or replace choke cable
Carburetor main jet adjustment is incorrect - Adjust main jet as required
Loose or defective spark plug - Replace or tighten spark plug
Valves are stuck, worn, or burned - Clean or change valves
Worn piston, rings, or sleeve - Replace defective components
Excessive valve clearance - Adjustment procedure required
Excessive oil consumption
Gaskets or seals can be faulty - Replace worn parts to avoid leaks
Valve stems or guides are damaged - Need to replace the valves
Piston rings are defective or worn - Change piston rings
Damaged cylinder liner or piston - Inspect piston and liner, fit new components as necessary
Breather hose or pipe is plugged - Change or service

Hydrostatic Transmission Troubleshooting
Excessive HST transmission noise
Speed control pedal linkage is bent or not adjusted - Adjust or repair linkage
Excessive loading - Reduce the load is required
Low transmission oil level or contaminated oil - Add oil to the correct level or fill the transmission with fresh oil
Defective or worn transmission parts - Check transmission parts for damage or wear and replace if required
Hard to shift
Shift linkage is corroded or worn - Lubricate or replace linkage
Stuck or defective hydrostatic pump - Repair or replace pump
Worn or misadjusted transmission shift control parts - Adjust correctly or replace
Lack of power
Transmission oil level is low - Fill up the transmission oil
Worn or damaged drive sheave - Install a new sheave
Shifter linkage is faulty or not adjusted - Adjust correctly or replace linkage
Worn or unadjusted speed control linkage - Adjust or replace linkage
Transmission leakage
Broken transmission gaskets or seals - Install new seals or gaskets
Final drive shaft leaks - Shaft seals need to be changed
Cracked transmission case - Install a new transmission case

Mower Deck Troubleshooting
Mower vibrates too much
Damaged or clogged mower drive pulley - Clean or change pulley
Drive belt is defective or loose - Adjust belt tension or replace belt
Mower blades are not balanced or warped - Change or balance blades
Loose blade mounting bolts - Tighten it fast
Constant clogging of discharge chute
High ground speed - Use a lower speed
Long grass - Must be set to low cutting height
Reduced engine speeds - Choke is not fully opening
Cutting height is too low - Adjust mower to higher cutting height
Incorrect mower drive belt installation - Check drive belt for correct installation
Grass patches are not cut
Discharge area is clogged - Mower deck needs to be cleaned
Not sharp blades - Need a blade sharpening
Damaged or worn blades - Blades must be changed
Fast mowing speed - Select a lower speed
Mower cuts too low - Use correct cutting height
Filled bagger - Clean bagger
Blades are scalping the grass
Bumpy or unleveled lawn - Lawn needs to be leveled
Mower cuts too low - Use correct cutting height
High mowing speed - Select a lower speed
Deck level is not correct - Deck should be adjusted correctly
Blades are bent or worn - Replace the blades
Low tire inflation - Correct tire pressure
Uneven cut
Tires are not properly inflated - Inflate tires as required
Incorrect level of mower deck - Adjust mower deck level properly
Not sharp blades - Sharpen the blades
Worn or bent blades - Install new blades
Deck is plugged with grass - Need to clean the mower deck
Broken mower deck shell - Replace or rebuild mower deck
Bent or loose mower spindle - Spindle needs to be repaired or replaced

Electrical Troubleshooting
Battery does not charge
Electrical wire connections are corroded or loose Service or tighten connections
Battery terminal clamps are faulty - Terminal clamps should be changed
Worn-out battery - Battery replacement required
Starter motor cranks slow
Low battery voltage - Battery is drained, charge it
Battery is draining quickly - Service battery or replace it
Disconnected wires or corroded battery terminals - Check cables and clean or change terminals
Starter will not crank
Battery is drained or worn - Change or recharge battery
Battery cables are disconnected or improperly connected - Inspect cables and connect properly
Low battery output voltage - Charge the battery
Improperly gapped or dirty spark plug - Clean, gap or replace spark plug
Starter motor or solenoid is defective - Starter/solenoid should be replaced




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