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John Deere LA125 Problems and Solutions

John Deere LA125 Engine Troubleshooting

Engine doesn't start

No gasoline in tank - Fill it up.
Incorrect fuel grade - Change gasoline.
Old gasoline - Drain fuel and add fresh.
Water or air in fuel system - Remove air or water from system.
Spark plug wires are damaged - Check wires connection.
Spark plug damaged - Installing new spark plug.
Clogged fuel filter - Fit new filter.
Brake pedal not pushed down - Push the brake pedal down.
Carburetor malfunction - Check and repair as required.
Inspect and adjust choke. Test crankcase vacuum.

Engine hard starting

Spark plug malfunction - Inspect the spark, change if necessary.
Carburetor incorrectly set - Set carb correctly.
Fuel lines are clogged - Remove clogging from fuel pipes.
Choke cable not adjusted properly - Checking and adjusting.
Stale or incorrect fuel - Pour quality fuel.
Electrical connection problems - Inspect and replace wiring as needed.
Starter fault - Check the starter and replace defective components.

Engine runs unevenly

Cooling fins plugged - Clean cooling fins.
Electrical connections damaged - Inspect and repair defective contacts.
Ignition adjust incorrect - Test ignition and spark plug.
Choke cable sticking - Repair or change as needed.
Air filter blocked - Clean or change air filter.

Engine stops or misses

Spark plug worn out - Check spark plug wire for wet or deteriorated condition.
Carburetor problems - Test and repair.
Ignition coil defective - Test ignition coil and replace if necessary.

JD LA125 Engine overheating

Engine overloaded - Reduce the load.
Air inlet or cooling fins blocked - Clean dirty components.
Engine oil high or too low - Add or drain oil.
Poor quality oil - Change oil.
Inspect crankshaft to main bearing clearance.
Fast idle speed - Adjust carburetor idle mixture screw.

Engine doesn't idle speed

Spark plug is loose - Adjust spark plug gap.
Spark plug fail - Inspect the spark, replace if necessary.

Engine knocking

Low octane fuel - Change fuel.
Engine overloaded - Reduce loads.
Lack of engine oil - add oil as required.
Low engine speed - Adjust the required speed.
Cylinder bore and rings worn out - Inspect and replace if required.
Inspect for engine overheats from clogged cooling fins.
Check and adjust valve clearance.
Check for carbon build-up in combustion chamber.

Engine back-fire

Inspect spark plug and change if required.
Adjust or replace choke.
Adjust carburetor idle mixture screw.
Checking and adjusting ignition coil air gap.
Inspect inlet and outlet valves.
Check and adjust valve clearance.
Inspect flywheel key.

Engine loses power

Engine overheats - Air cleaner element plugged.
Engine oil overfilled - Remove excess oil.
Faulty fuel pump - Testing fuel pump output.
Defective governor - Inspect and repair governor.
Inspect and repair carburetor.
Checking engine compression.

Engine using too much gasoline

Choke is not fully open - Replace throttle cable.
Incorrect carburetor adjustment - Check carburetor float adjustment.

Emits black smoke

Air filter element plugged - Inspect and clean.
Choke not fully engaged - Replace or repair choke.
Checking and adjusting carburetor float level.

JD LA125 Electrical System Troubleshooting

Starter doesn't work or will not turn engine

Main fuse defective - Installing new fuse.
Battery contacts are corroded - Inspect and clean terminals.
Battery not charged - Charge the battery.
Ignition lock problems - Change the lock.
Faulty starter - Change the starter.
Electrical wires are damaged - Replace wiring.

Battery will not charge

Battery cells fails - Replace the battery.
Battery terminals and cables are dirty - Clean or replace cable.

Lighting does not function

Light connector defective.
Replace light bulbs.
Wiring damaged.

John Deere LA125 Machine Problems

Tractor vibrates excessively

Attachment drive belts worn or damaged - Belt replacement required.
Traction drive belt damage - Fit new belt.
Drive sheaves malfunction - Clean the sheaves.
Unbalancing or bending of blades - Replace defective blades.

Tractor will not move with engine running

The parking brake is locked - Unlock park brake.
Bypass valve pulled out - Disengage the bypass valve lever.
Blade becomes loose - Tighten mower blades.
Improper blade balance - Check mower blade balancing.
Too much or too little oil - Add oil to the transmission.

John Deere LA125 Lawn Mower Troubleshooting

Plugged discharge chute

Operating at a faster ground speed - Choose recommended speed.
Grass Too Tall - Adjusting cutting height.
The grass is wet - Wait for the grass to dry.
Low engine speeds - Open choke wide.
Restricted air flow - Check engine rpm.
cut too low - Use higher cutting.
Belt fitted incorrectly - Install the belt correctly.

Lawn mower leaving uncut grass

Debris in mower deck - Deck cleaning required.
Blade wornout - Install new blade.
Mower deck is low from ground - Checking and adjust deck height.
Bagger too full - Empty bagger.
Speed is very high - Use slower speed.

Slipping drive belt

Pulley is dirty - Recommend cleaning the sheaves.
Belt is damaged - Fit new belt.
Low belt tension - Check and adjusting belt tension.

Excessive mower vibration

Mower clogged or in pulleys - Clean sheave and deck from clogging.
Sheaves or belt faulty - Replace defective parts.
Misaligned belt or pulley - Check and align.
Blades out of balance - Balance blades properly.

Blades scalping grass

Cutting height improper - Set the correct cutting height.
Mower height wheels not adjusted - Check the wheel heights.
Insufficient tire pressure - Inflate tires as required.
Higher blade speed - Blade speed required.
Bent mower blades - Install new blades.

Uneven Cut

Mower deck not leveled properly - Deck leveling required.
Tire pressure uneven - Inflate tires as required.
Incorrect rollers height - Check wheel adjustment.
Travel speed too high - Don't use fast speed.
Mower blades blunt - Sharpen the blade or install a new one.

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

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