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John Deere LA105 Troubleshooting
The
John Deere LA105 lawn tractor was manufactured from 2008 to 2010. The JD LA105
driveline consists of a Briggs and Stratton 31P677 4-cycle single cylinder OHV
vertical shaft air-cooled gasoline engine and Dana 4360 belt-driven gear
transmission with 5 forward and 1 reverse gears.
A 30.6 cu.in (501 cc) engine has a cylinder bore of 3.56" (91 mm),
piston stroke of 3.06" (78 mm), and rated power of 19.5 hp (14.5 kW).
Max. forward speed - 5 mph (8 km/h), maximum reverse speed - 2.3 mph
(3.7 km/h).
The 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"
(1240 mm). The John Deere LA105 is compatible with a 42" mid-mount
2-blade mower deck with cutting height of 1-4" (25-102 mm), 44"
front-mount 2-stage snowblower with clearing height of 18" (450 mm), and
46" front blade with manual lifting system.
| Engine Troubleshooting |
| Engine hard to start or will not start |
| Empty gas tank - Fill it up |
| Improper fuel grade - Change gasoline |
| Dirty fuel system - Check and clean |
| Defective spark plug wire connection - Inspect spark plug wiring connection, change or repair |
| Faulty spark plug - Change spark plug as required |
| Plugged fuel filter - Fuel filter needs to be replaced |
| Brake pedal not depressed - Press the brake pedal |
| Carburetor is not working properly - Inspect and adjust |
| Bad compression - Check and change damaged parts |
| Throttle cable is adjusted improperly or worn - Adjust properly or replace the cable |
| Cooling fins are clogged - Need to clean or wash |
| Ignition system is defective - Check ignition and replace faulty components |
| Defective or stuck choke cable - Change or service the cable |
| Air filter element is plugged - Clean or replace air filter |
| Fuel pump is clogged or faulty - Service or change fuel pump |
| Engine starts but immediately stops |
| Spark plug is damaged - Install new spark plug |
| Carburetor is dirty or defective - Service or change carburetor |
| Faulty ignition coil - Replace ignition coil as necessary |
| Valve springs are worn or loose - Replace valve springs |
| Stuck valves - Valves must be cleaned |
| Engine oil level low - Add oil to the engine crankcase |
| Excessive engine load - Load reducing is recommended |
| Cooling fins are blocked - Clean and wash as required |
| Carburetor is running lean - Make the correct settings |
| Incorrect ignition timing - Set the ignition timing properly |
| Valve setting is incorrect - Adjust valves as required |
| Stale or low octane fuel - Use proper fuel |
| Engine is under excessive load - Load reducing is recommended |
| Engine oil level is low - Check oil level and add oil as required |
| Wrong adjustment of low idle speed - Correct idle settings |
| Fuel pump is clogged or faulty - Clean or replace fuel pump |
| Worn main bearings or crankshaft - Crankshaft or bearings need to be replaced |
| Excessive valve clearance - Adjust valve clearance |
| Cylinder bore or piston rings are worn - Replace faulty components |
| Dirty or improperly adjusted carburetor - Adjust the carburetor properly or clean it |
| Air filter element is plugged - Change or service air filter |
| Clogged or damaged fuel pump - Test fuel pump and replace if necessary |
| Ignition system malfunction - Inspect ignition system and change failed components |
| Defective 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 components are faulty - Replace defective components as required |
| Engine using too much gasoline |
| Choke did not open fully - Change or adjust choke cable |
| Improper adjustment of carburetor main jet - Adjust it correctly |
| Spark plug is loose or defective - Tighten or replace spark plug |
| Worn, stuck, or burned valves - Replace or service valves |
| Worn piston, rings, or sleeve - Change faulty components |
| Improper valve clearance - Adjust to proper valve clearance |
| Engine consuming too much oil |
| Damaged gaskets or seals - New components need to be installed |
| Damaged valve guides or valve stems - Change the valves |
| Piston rings are stuck or broken - Replace piston rings |
| Piston or cylinder liner is scored - Inspect piston and liner, change as required |
| Blocked breather pipe or hose - Clean or replace |
| Transmission Troubleshooting |
| Difficult to shift gears |
| Loose or broken gear shift linkage - Change defective shift linkage |
| Shift forks are bent or worn out - Replace the shift forks |
| Gear shifting mechanism is worn - Change worn components |
| Transmission oil level is low - Fill the transmission housing to proper oil level |
| Transmission oil is dirty - Transmission oil change required |
| Worn gears or damaged bearings - Replace gears or bearings |
| Transmission jumping out of gear |
| Bent or incorrectly installed shift lever - Reinstall the lever properly or change it |
| Gears are worn or damaged - Change gears |
| Shift forks or shift rods are worn - Change defective forks or rods |
| Drive shaft/belt is worn or incorrectly adjusted - Install a new shaft/belt or adjust it |
| Improper brake/clutch adjustment or damaged brake/clutch - Replace brake/clutch or adjust it |
| Drive sheave is worn or faulty - Replace sheave |
| Mower Deck Troubleshooting |
| Mower vibration is excessive |
| Damaged or clogged mower drive pulley - Clean or change pulley |
| Drive belt is damaged or loose - Install a new belt or adjust belt tension |
| Mower blades are warped or not balanced - Balance or change blades |
| Loose blade bolts tightening - Bolts should be tightened |
| Constant clogging of discharge chute |
| Mowing speed is too high - Select a lower speed |
| Grass is too long - Must be set to low cutting height |
| Reduced engine rpm - Adjust carburetor to higher rpm |
| Cutting height is too low - Use correct cutting height |
| Incorrect mower drive belt installation - Install drive belt correctly |
| Mower leaving random uncut of grass |
| Clogged mower deck - Check cutting deck and clean as necessary |
| Not sharp blades - Sharpen the blades |
| Worn or damaged blades - Install new blades |
| High ground speed - Need to slow down |
| Cutting height is too low - Use a higher cutting height |
| Bagger is overfilled - Remove grass from bagger |
| Lawn is bumpy or not smooth - Lawn leveling required |
| Cutting level is too low - Adjust mower to higher cutting height |
| High mowing speed - Use a slower speed |
| Mower deck is not leveled properly - Adjust the level of mower deck correctly |
| Blades are bent or worn - Blades must be changed |
| Tires are not properly inflated - Inflate tires as required |
| Low tire inflation - Inflate tires as required |
| Mower deck is not leveled properly - Adjust mower deck level properly |
| Blades are excessively dull - Need a blade sharpening |
| Damaged or worn blades - Replace the blades |
| Discharge area is clogged - Clean out the mower deck |
| Deck shell is damaged - Repair or replace the deck |
| Loose or defective mower spindle - Repair or replace the spindle |
| Electrical Troubleshooting |
| Battery won’t charge |
| Electrical cable connections are corroded or loose - Clean or tighten wiring connections |
| Battery terminal connectors are faulty - Install new terminal connectors |
| Bad cell in battery - Change the battery |
| Battery power is low - Battery needs to be recharged |
| Battery will not hold charge - Service charging system or replace battery |
| Bad battery terminals or disconnected wiring - Check wiring and clean or replace terminals |
| Battery is drained or worn - Recharge or change battery |
| Battery cables are disconnected or incorrectly connected - Check cables and connect as needed |
| Low battery output - Charge the battery |
| Improperly gapped or dirty spark plug - Clean, gap or replace spark plug |
| Solenoid or starter motor failure - Change solenoid or repair starter |
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| Lawn and Garden Tractors Technical Specs |
