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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 |
| 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 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
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| Lawn and Garden Tractors Technical Specs |
