John Deere LA105 Tractor Troubleshooting (2024)

JD LA105 Engine Problems

Engine not starting

Empty fuel tank - Add gasoline.
Improper fuel grade - Use correct gasoline grade.
Old gas - Drain fuel and replace with fresh fuel.
Dirty fuel lines - Inspect and clean.
Faulty spark plug wire - Inspect and replace if required.
Spark plug damaged - Spark plugs need to be replaced.
Dirty fuel filter - Change fuel filter.
Faulty safety switch - Change damaged switch.
Carburetor problems - Carburetor diagnostics required.
Inspect and adjust throttle cable. Compression problems.

Engine hard starting

Spark plug fail - Test spark and replace as required.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Dirt in fuel lines - Clean fuel system components.
Throttle cable worn - Install new throttle cable.
Stale or incorrect fuel - Drain and add proper gasoline.
Loose or corroded electrical connections - Inspect and change wires if required.
Failing starter - Check starter, repair or replace.

Rough running engine

Plugged cooling fins - Clean cooling fins.
Loose electrical contacts - Check and replace damaged connections.
Ignition adjust incorrect - Check ignition system and adjust as required.
Choke cable sticks - Check and repair.
Air cleaner dirty - Clean or change air filter.

Engine misses under load

Spark plug worn out - Inspect spark plug wire.
Carburetor problems - Test and repair.
Ignition coil air gap incorrect - Check and adjust ignition coil air gap.

Engine overheating

Engine runs under excessive load - Reduce loads.
Cooling fins or air inlet plugged - Clean and wash dirty components.
Too little or too much oil - Add or drain oil.
Poor quality oil - Change oil.
Inspect crankshaft to main bearing clearance.
Fast idle speed - Adjust fast idle.

Engine does not idle

Poor spark plug contact - Adjust spark plug gap.
Spark plug failed - Test spark and replace as required.

John Deere LA105 Engine knocking

Stale gasoline - Use correct gasoline.
Excessive engine load - Reduce loads.
Oil level low - Add engine oil.
Low engine speed - Adjust the required speed.
piston rings or cylinder bore damaged - Replace damaged parts.
Inspect for engine overheats from clogged cooling fins.
Inspect and adjusting crankshaft end play.
Checking for wear crankshaft or camshaft bearings.

Engine back-fire

Checking spark plug.
Adjust or replace throttle.
Check and adjust carburetor.
Check and adjust ignition coil air gap.
Check inlet and outlet valves.
Test valve clearance, adjusting if necessary.
Checking flywheel key.

Loss of power

Engine temperature too high - Air cleaner element plugged.
Engine oil overfilled - Excess oil needs to be drained.
Defective fuel pump - Testing fuel pump output.
Governor not work - Inspect and repair governor.
Check carburetor float adjustment.
Checking engine compression.

Excessive fuel consumption

Choke doesn't open well - Replace choke cable.
Carburetor malfunction - Adjust or repair carburetor.

Black exhaust smoke

Air cleaner is dirty or oiled - Check and clean.
Throttle is partially engaged - Inspect and adjust throttle.
Check and adjust carburetor float level.

John Deere LA105 Electrical System Troubleshooting

Starter does not run

Main fuse malfunction - Install new fuse.
Terminals are severely corroded and heat up - Inspect and clean contacts.
Battery not charged - Charge the battery.
Ignition lock problems - Replace switch.
Damaged starter - Change the starter.
Electrical wires are damaged - Connect wires.

Battery doesn't charge

One or more battery cells dead - Change the battery.
Poor contact between cable and battery pole - Replace or clean cable.

Lighting does not function

Connection/disconnection level in wrong position.
Loose or burned out bulb.
Wiring short circuit.

JD LA105 Machine Problems

The machine vibrates

Equipment drive belts worn out - Check and replace worn belt.
Traction drive belt worn - Installing new driven belt.
Drive sheaves malfunction - Replace if necessary.
Unbalancing or bending of blades - Balance the blades or replace.

Machine does not move while engine is running

Parking brake locked - Unlock park brake.
Bypass valve lever in the push position - Disengage the bypass valve lever.
Loose lawnmower blades - Fasten the blades securely.
Improper blade balance - Balance the blades correctly.
Lack of oil in transmission - Pour oil as required.

John Deere LA105 Lawn Mower Troubleshooting

Discharge Chute Plugged

Travel speed too fast - Operate the mower at low speed.
Grass too long - try operating a short cutting height.
Grass too wet - Do not mow when grass is wet.
Engine runs at low revs - Open throttle fully.
Restricted air flow - Check engine rpm.
Mower deck set to low cutting - Adjust cutting settings.
Belt is loose - Fit belt correctly.

Uncut grass during operation

Debris in mower deck - Check cutting deck and clean if necessary.
Excessive blade wear - Sharpen the blade or install a new one.
Mower deck low - Leveling the mower deck.
Bagger too full - Empty the grass bag.
Ground speed too fast - Choose recommended speed.

Belt slips

Debris in pulleys - Clean or replace.
Belt is loose - Inspect and replace worn belt.
Belt tension is incorrect - Correct belt tension.

The lawn mower vibrates excessively

Mower deck clogged or in sheaves - Clean deck and pulley from debris.
Belt or sheaves faulty - Change damaged parts.
Misaligned belt or pulley - Check and adjust.
No blade balance adjustment - Blades need balancing.

Blade strips grass

Cutting height too low - Raise cutting height.
Mower wheel height incorrect - Check the wheel heights.
Tires inflated insufficient - Increase tire pressure.
Faster mower blade speeds - Blade speed required.
Blades are bent - Remove bent blade and install new one.

Uneven Cut

Mower deck low - Deck leveling required.
Tire pressure uneven - Increase tire pressure.
Wheels not positioned correctly - Check the wheel heights.
Ground speed too fast - Use slower speed.
Mower blades dull - Inspect and fit new blade if required.

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