Home / Lawn and Garden Tractors / John Deere Lawn Tractors / John Deere LX172

John Deere LX172 Troubleshooting

The John Deere LX172 is a 2WD lawn tractor from LX100 series. This model was manufactured between 1990 and 1997. The John Deere LX172 driveline components: a 25.8 cubic inches (423 cc) Kawasaki FC420V 4-Stroke OHV single cylinder forced air-cooled gasoline engine with a rated power of 14 Hp (10.4 kW), and Peerless 801 belt-driven gear transmission with 5 forward and 1 reverse gears.

The engine has a float fixed main jet carburetor, diaphragm type pulse pump, full pressure lubrication, and semi-cyclone air cleaner with dual element. Max. travel speed (forward and reverse): 5.2 mph (8.4 km/h) / 2.3 mph (3.7 km/h).

The lawn tractor was equipped with a manual sector and pinion steering, mechanical band brakes, 15x6.00-6 front tires, and 20x10.00-8 rear tires. The wheel base is 46 inches (1160 mm). The John Deere LX172 is compatible with the following attachments: a 38" mid-mount 2-blade mower deck with cutting height of 1.5-4" (38-102 mm) and manual lift, or 38", 42" front-mount single-stage snowblowers with mechanical lifting system.

Engine Troubleshooting
Engine starts up hard or won't start
No gasoline in tank - Fill gasoline up
Improper fuel grade - Use quality fuel
Air in the fuel pipes - Bleed the fuel pipes
Spark plug wire is loose or disconnected - Inspect the spark plug wire connection, replace or repair
Spark plug is faulty - Change spark plug as required
Fuel filter is plugged - Install new filter
Brake pedal not pushed down - Push the brake pedal down
Carburetor incorrectly set - Set carb correctly
Low cylinder compression - Check cylinder block and replace worn parts
Worn or improperly adjusted choke cable - Adjust correctly or replace the cable
Engine runs unevenly
Air intake screen is blocked - Clean and wash as required
Ignition system problems - Check ignition and replace faulty components
Choke cable is defective or stuck - Service or change the cable
Clogged air filter - Clean or change air filter
Fuel pump is defective or dirty - Clean or install new fuel pump
Engine starts but stalls suddenly
Spark plug is faulty - Change spark plug
Faulty or clogged carburetor - Clean or change carburetor
Ignition coil is damaged - Install a new ignition coil
Loose or worn valve springs - Valve springs need to be changed
Stuck valves - Clean the valves
Engine is overheated
Engine oil insufficient - Fill up the oil to required level
Engine is overloaded - Reduce the load
Cooling fins are blocked - Need to wash or clean
Too lean fuel mixture in carburetor - Set the carburetor correctly
Ignition timing is improper - Adjust ignition timing correctly
Incorrect valve setting - Adjust valves correctly
Engine knocking sound or abnormal noise
Stale or low octane fuel - Change fuel
Engine is under excessive load - Reduce the load
Engine oil insufficient - Check oil level and add oil as required
Too low idle RPM - Test and adjust
Clogged or defective fuel pump - Service or replace fuel pump
Crankshaft or main bearings wear - Replace crankshaft or bearings
Improper valve clearance - Need to adjust valve clearance
Cylinder bore or piston rings are worn - Change defective components
Engine power is insufficient
Dirty or incorrectly adjusted carburetor - Clean or correctly adjust carburetor
Clogged air filter - Service or change air filter
Dirty or defective fuel pump - Check fuel pump and change if required
Ignition failure - Inspect ignition system and change failed components
Cylinder head gasket is damaged - Install new cylinder head gasket
Stuck or burned valves - Replace or clean valves
Push rod is worn or defective - Push rod should be replaced
Faulty cylinder block components - Replace defective components as required
High fuel consumption
Throttle not fully open - Check throttle cable and adjust as required
Incorrect adjustment of carburetor main jet - Adjust it properly
Faulty or loose spark plug - Change or re-tighten spark plug
Valves are worn, stuck, or burned - Service or change valves
Worn sleeve, piston, or rings - Change faulty parts
Incorrect valve clearance - Adjust valve clearance
Engine consuming too much oil
Gaskets or seals may be damaged - Install new components
Valve guides or stems are damaged - Install new valves
Stuck or worn piston rings - Change piston rings
Cylinder liner or piston is scuffed - Check piston and liner, install new parts as required
Plugged breather pipe or hose - Service or change

Transmission Troubleshooting
Difficulty shifting gears
Damaged or loose gear shift linkage - Change or repair shift linkage
Shift forks are worn or bent - Change the shift forks
Gearshift mechanism malfunctions - Identify and repair faults
Transmission noise
Low transmission fluid level - Add fluid to the transmission housing
Transmission oil is contaminated - Fill up with fresh transmission oil
Bearings or gears are damaged - Change bearings or gears
Transmission jumps out of gear
Bent or incorrectly installed shift lever - Install the lever correctly or replace it
Damaged or worn gear teeth - Replace gears
Shift rods or shift forks are worn - Change damaged forks or rods
Transmission slipping
Drive belt/shaft is defective or improperly adjusted - Adjust belt/shaft or install a new one
Clutch/brake is defective or improperly adjusted - Replace brake/clutch or adjust it
Drive sheave is worn or faulty - Change sheave

Mower Deck Troubleshooting
Mower vibrates too much
Dirty or worn mower drive sheave - Clean or change sheave
Loose or damaged drive belt - Install a new belt or adjust belt tension
Unbalanced or warped mower blades - Replace or balance blades
Loose blade bolts tightening - Tighten it fast
Discharge chute is constantly plugged
High ground speed - Need to slow down
Grass is too long - Must be set to low cutting height
Engine runs at low revs - Adjust carburetor to higher rpm
Low cutting height - Change cutting height adjustment
Drive belt installation is not correct - Check drive belt for correct installation
Patches of grass uncut
Mower deck is clogged - Clean out the mower deck
Blades are excessively dull - Sharpen the blades
Defective or worn blades - Change the blades
Fast ground speed - Select a lower speed
Mower deck set to low cutting - Must be set to high cutting height
Grass bag is full - Remove grass from bag
Blades are scalping the grass
Uneven or bumpy lawn - Lawn needs to be leveled
Cutting height is too low - Change cutting height adjustment
Fast mowing speed - Need to slow down
Deck is not leveled correctly - Deck needs to be adjusted properly
Damaged or bent blades - Replace the blades
Incorrect tire pressure - Inflate tires as required
Mower deck to cut unevenly
Low tire inflation - Inflate tires as required
Improper mower deck level - Level the deck correctly
Blades are not sharp - Sharpen the blades
Blades are defective or worn - Install new blades
Discharge chute is plugged - Inspect and clean cutting deck
Damaged mower deck housing - Repair or replace the deck
Loose or defective mower spindle - Change or repair the spindle

Electrical Troubleshooting
Battery does not charge
Wiring connections are corroded or loose - Tighten or clean electrical wiring connections
Battery terminal connectors are faulty - Terminal connectors should be replaced
Battery is worn - Change the battery
Starter cranks slowly
Low battery output voltage - Recharge the battery
Battery will not hold charge - Service or change the battery
Bad terminals or disconnected battery cables - Check wire connections and change or service terminals
Starter motor is not working
Battery is drained or worn - Recharge or replace battery
Battery cables are disconnected or improperly connected - Inspect cables and connect properly
Battery power is low - Recharge the battery
Spark plug gapped improperly or faulty - Clean and gap or replace
Starter motor or solenoid is damaged - Starter/solenoid needs to be replaced




Lawn and Garden Tractors Technical Specs