Specifications, Service and Repair of Farm and Lawn Tractors

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John Deere LA115 Troubleshooting

John Deere LA115 Engine Problems

Tractor engine not to start

No gasoline in tank - Add fuel.
Low-quality gasoline - Use correct gasoline grade.
Old fuel - Drain fuel and add fresh.
Clogged fuel system - Remove clogging.
Plug connection defective - Inspect and change if necessary.
Faulty spark plug - Clean, adjust gap or replace.
Fuel filter is clogged - Change fuel filter.
Defective safety switch - Replace if required.
Carburetor is clogged - Clean the carburetor.
Inspect and adjust choke. Compression problems.

Engine hard to start

Spark plug failed - Check the spark and replace defective spark.
Carburetor incorrectly set - Set carb correctly.
Dirt in fuel lines - Service required.
Worn throttle cable - Replace as required.
Stale or improper gasoline - Fill in proper gasoline.
Loose or corroded electrical connections - Checking and replace.
Starter problems - Check starter, repair or replace.

Rough running engine

Cooling fins blocked - Clean cooling fins.
Electrical connections damaged - Inspect and replace defective contacts.
Ignition system problems - Test ignition and spark plug.
Throttle cable sticking - Check and replace.
Air filter element clogged - Replace air cleaner.

Engine runs but misses

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

Engine overheats

Engine overloaded - Reduce the load.
Air intake screen blocked - Clean and wash dirty components.
Too much or too little oil - Check oil level. Test engine oil pressure.
Poor quality oil - Change engine oil.
Check internal bearing clearance.
Fast idle speed - Adjust fast idle.

Engine doesn't idle speed

Spark plug not gapped correctly - Adjust spark plug gap.
Spark plug malfunction - Test spark and change as required.

JD LA115 Engine knocks

Low octane gasoline - Use correct fuel.
Engine overload - Reduce the load.
Low oil level - Add engine oil.
Engine speed too low - Adjust the speed.
Piston rings and cylinder bore are wear - Replace defective components.
Inspect for engine overheats from clogged cooling fins.
Check and adjust valve clearance.
Check for loose or worn connecting rods.

Engine back-fire

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

Engine lacks power

Engine overheats - Clean or replace air filter.
High engine oil - Excess oil needs to be drained.
Faulty fuel pump - Test fuel pump output.
Governor not work - Repair or replace governor.
Inspect carburetor for plugged passages.
Test engine compression.

Engine using too much gasoline

Throttle does not open well - Replace throttle cable.
Carburetor malfunction - Checking and adjusting carburetor.

Black exhaust smoke

Air filter element clogged - Check and clean.
Throttle not fully engaged - Replace or repair choke.
Check oil fill dipstick O-ring seal or cracked cap.

John Deere LA115 Electrical Troubleshooting

Starter motor will not turn engine

Main fuse malfunction - Install new fuse.
Battery terminals are corroded - Clean connections.
Low battery voltage - Charge the battery.
Ignition lock is damaged - Replace switch.
Faulty starter - Repair or replace.
Wiring damage - Replace electric wires.

Battery doesn't charge

Battery cells defective - Replace the battery.
Battery terminals and cables are dirty - Check and Clean.

Lights do not work

Light plug defective.
Bulbs defective.
Inspect electrical wires for short- circuit.

JD LA115 Machine Troubleshooting

Excessive tractor vibration

Equipment drive belts worn out - Check and replace worn belt.
Traction drive belt worn - Inspect and replace traction belt.
Dirt on drive sheaves - Replace if necessary.
Cutting blade loose or unbalanced - Tighten and balance blade.

The engine is running but tractor is not moving

Parking brake locked - Disengage the park brake.
Bypass valve lever in the push position - Set bypass valve to the off position.
Loose lawnmower blades - Checking blades for loose bolts.
Blades are unbalanced - Check blade balancing.
Transmission oil is low - Topping up oil.

John Deere LA115 Mower Deck Problems

Clogged discharge chute

Traveling too fast - Choose recommended speed.
Grass too long - Use a shorter cutting height.
Grass too wet - Do not use the mower if grass is wet.
Engine is running at too low speed - Open choke fully.
Restricted air flow - Adjust to high revs.
Lack of cutting height - Choose the correct cutting height.
Belt installed improperly - Fit belt correctly.

Patches of grass uncut

Debris in cutting deck - Clean mower deck.
Defective blade - Check for blade damage and replace if necessary.
Mower deck low - Level mower deck.
Bagger too full - Clean bagger.
Traveling too fast - Choose recommended speed.

Belt Slipping

Dirt in the sheaves - Clean or replace.
Drive belt damage - Inspect and replace worn belt.
Belt tension is incorrect - Belt tension needs to be adjusted.

Mower vibrates

Mower clogged or in pulleys - Clean sheave and deck from clogging.
Worn belt or sheave - Change worn components.
Belt or pulleys out of centering - Check and align.
Blades out of balance - Balance blades properly.

Blades scalp grass

Cutting height incorrect - Check and adjust height.
Mower rollers not adjusted improperly - Adjust front or back wheel height.
Insufficient tire pressure - Increase tire pressure.
Faster mower blade speeds - Blade speed required.
Bent mower blades - Install new blades.

Uneven Cut

Deck level is too low - Checking and adjust deck height.
Low tire pressure - Check and inflate the tires.
Wrong wheel position - Adjust mower deck wheels.
Gear too fast - Don't use fast speed.
Blades blunt - Install new blade.

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JOHN DEERE LAWN TRACTORS SPECIFICATIONS

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ENGINES FOR JOHN DEERE LAWN TRACTORS

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JOHN DEERE TRACTORS ATTACHMENTS
420 430 455 790 990
X300 X320 X330 X350 X475
X485 X500 X540 X570 X590
X700 X720 X738 X758 1023E
2025R 2210 2520 3025E 3032E
3038E 3038R 3039R 3046R 3203
3320 3520 4052R 4066R 4100
4105 4115 4200 4310 4320
4400 4410 4520 4600 4720

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JOHN DEERE FRONT END LOADERS

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JD TRACTORS TROUBLESHOOTING
2640 3040 3310 3650 4100
5050D 5090R 5410 6105R 7200R
E130 L111 LA110 LT155 X300R

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JOHN DEERE FARM TRACTORS SPECIFICATIONS

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