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John Deere L110 Troubleshooting

The John Deere L110 is a two-wheel drive lawn tractor from L100-series. This model was manufactured between 2003 to 2004. The John Deere L110 driveline includes a Kohler Command CV491 four-cycle single cylinder air-cooled gasoline engine and Tuff Torq K46 belt-driven hydrostatic transmission with foot-controlled variable speed drive.

A 36.4 cubic inches engine has a cylinder bore of 3.6" (90 mm), piston stroke of 3.03" (77 mm), and rated power of 17.5 hp (13 kW). The maximum travel speed (forward and reverse): 5.7 mph (9.2 km/h) / 3.4 mph (5.5 km/h).

The John Deere L110 lawn tractor is 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). Compatible attachments for the tractor: a 42" mid-mount 2-blade mower deck with a cutting height of 1.0-4.0" (25-102 mm), a 46" front blade with manual lift, and 42" front-mount two-stage snow blower with a clearing height of 21" (530 mm).

Engine Troubleshooting
Engine doesn't start or hard to start
Empty gas tank - Fill it up
Wrong grade of gasoline - Use correct fuel grade
Clogged fuel system - Remove clogging
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change
Spark plug is faulty - Replace spark plug
Fuel filter is plugged - Replace fuel filter
Brake pedal not depressed - Press the brake pedal
Carburetor is not working properly - Inspect and adjust
Engine has low compression - Check cylinder block and replace defective parts
Throttle cable is worn or adjusted improperly - Adjust correctly or change the cable
Engine runs unevenly
Air intake screen is blocked - Need to wash or clean
Defective ignition - Check ignition system and replace faulty parts
Choke cable is defective or stuck - Service or change the cable
Air filter element is clogged - Replace or service air filter
Fuel pump is defective or dirty - Clean or replace fuel pump
Engine starts but then shuts off
Spark plug is defective - Change spark plug as required
Carburetor is faulty or clogged - Clean or install new carburetor
Ignition coil is faulty - Install a new ignition coil
Bad or damaged valve springs - Replace valve springs
Stuck valves - Service the valves
Engine overheats
Engine oil insufficient - Fill up the engine oil
Excessive engine load - Load reducing required
Cooling fins are clogged - Clean and wash as required
Carburetor fuel mixture is too lean - Adjust carburetor properly
Wrong ignition timing - Ignition timing needs to be set properly
Valve setting is wrong - Valves needs to be adjusted properly
Engine knocking sound or abnormal noise
Stale gasoline - Use correct gasoline
Engine is under excessive load - Reduce engine load
Engine oil level is low - Check and refill engine oil
Incorrect low idle setting - Need to adjust idle speed
Clogged or damaged fuel pump - Clean or change fuel pump
Main bearings or crankshaft wear - Change defective components as required
Improper valve clearance - Adjust to proper valve clearance
Damaged cylinder bore or piston rings - Change defective components
Low engine power
Incorrectly adjusted or clogged carburetor - Adjust the carburetor properly or clean it
Plugged air filter - Change or service air filter
Fuel pump is dirty or defective - Inspect fuel pump and change as required
Ignition system problems - Inspect ignition system and change faulty parts
Cylinder head gasket is damaged - Change cylinder head gasket
Valves are stuck or burned - Change or service valves
Push rod is worn or defective - Change push rod
Cylinder block components are faulty - Defective components need to be replaced
Engine using too much gasoline
Throttle does not open well - Inspect throttle cable and adjust it
Carburetor main jet is improperly adjusted - Adjust the carburetor main jet correctly
Defective or loose spark plug - Spark plug need to be tightened or replaced
Stuck, burned, or worn valves - Clean or change valves
Worn sleeve, piston, or rings - Change defective parts
Improper valve clearance - Need to adjust valve clearance
High oil consumption
Gaskets or seals can be faulty - To repair leaks, replace worn parts
Valve guides or stems are damaged - Replace the valves
Worn or stuck piston rings - Piston rings replacement required
Piston or cylinder liner is worn - Inspect liner and piston, change as necessary
Breather hose or pipe is plugged - Change or clean

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission noises
Bent or unadjusted speed control pedal linkage - Replace or adjust linkage
Transmission is under excessive load - Reduce the load is required
Contaminated transmission fluid or low fluid level - Fill to required level or change the fluid
Transmission components are damaged or worn - Check transmission components and change if necessary
Difficult to shift
Shift linkage is stuck or damaged - Clean or change linkage
Blocked or faulty hydrostatic pump - Change or repair pump
Worn or misadjusted transmission shift control parts - Adjust correctly or replace
Low power
Lack of transmission oil supply - Need to add transmission oil
Drive pulley is damaged or worn - Replace pulley
Shift linkage is damaged or unadjusted - Adjust correctly or change linkage
Speed control linkage is defective or unadjusted - Repair or adjust linkage
Transmission leaks
Transmission seals or gaskets are broken - Install new seals or gaskets
Final drive shaft leaks - Install new shaft seals
Transmission case is cracked - Change broken case

Mower Deck Troubleshooting
Excessive mower vibration
Worn or dirty mower drive pulley - Change or clean pulley
Worn or loose drive belt - Adjust belt tension or install a new belt
Mower blades are not balanced or warped - Replace or balance blades
Blade mounting bolts are loose - Tighten bolts as required
Constant clogging of discharge chute
High ground speed - Select a lower speed
Long grass - Use a lower cutting height
Engine rpm is too low - Adjust throttle to full opening
Low cutting height - Use a higher cutting height
Mower drive belt installation is improper - Install drive belt correctly
Grass patches are not cut
Cutting deck clogging - Clean out the mower deck
Blades are excessively dull - Need a blade sharpening
Blades are defective or worn - Blades must be changed
Mowing speed is too high - Select a slower speed
Low cutting height - Must be set to high cutting height
Grass bag is full - Clean grass bag
Blades are scalping the grass
Lawn is not level or bumpy - Lawn needs to be leveled
Mower deck cutting height is set too low - Use correct cutting height
Mowing speed is too high - Need to slow down
Deck is not leveled correctly - Level the deck correctly
Blades are bent or worn - Blades must be changed
Tire pressure is too low - Correct tire pressure
Mower cuts uneven
Tires are not properly inflated - Correct tire pressure
Deck level is not correct - Adjust mower deck level properly
Not sharp blades - Need to sharpen the blades
Worn or defective blades - Change the blades
Clogged mower deck - Clean mower deck as required
Damaged mower deck shell - Repair or replace the deck
Bent or loose mower spindle - Install new spindle or repair it

Electrical Troubleshooting
Battery is not charging
Corroded or loose wire connections - Clean or tighten connections
Electrical terminal connectors are faulty - Terminal connectors should be replaced
Battery dead cell - Change the battery
Starter motor turns slow
Battery capacity is low - Battery needs to be recharged
Battery is not holding charge - Service charging system or change battery
Battery terminals are corroded or wires are disconnected - Check wire connections and change or clean terminals
Starter motor won't turn
Battery is low or faulty - Change or recharge battery
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly
Low battery capacity - Battery needs to be recharged
Spark plug faulty or incorrectly gapped - Clean, gap or replace spark plug
Damaged starter motor or solenoid - Repair starter or change solenoid




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