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John Deere X125 Tractor Problems

John Deere X125 Engine Problems

Engine doesn't start

Empty fuel tank - Fill fuel up.
Wrong grade of gasoline - Use correct fuel grade.
Old fuel - Drain gasoline and change with fresh.
Clogged fuel system - Remove clogging.
Plug connection defective - Replace if necessary.
Faulty spark plug - Clean, adjust gap or replace.
Fuel filter is dirty - Fuel filter needs changing.
Safety contact for brake pedal defective - Install new part.
Carburetor is not adjusted - Check carburetor float adjustment.
Check starter cranking RPM. Check and adjust valve clearance.

Gas engine hard to start

Spark plug wear - Inspect the spark, replace if necessary.
Carburetor is dirty - Wash, clean and adjust.
Fuel lines are clogged - Clean fuel system components.
Throttle cable worn - Install new throttle cable.
Stale or improper fuel - Pour quality fuel.
Loose or corroded electrical connections - Inspect and change.
Failing starter - Check the starter and replace defective components.

JD X125 Engine runs unevenly

Cooling fins plugged - Clean cooling fins.
Electrical contacts are damaged - Check and repair damaged connections.
Ignition adjustment lost - Test ignition and spark plug.
Choke cable sticking - Repair or replace.
Air cleaner element plugged - Clean or replace the air filter.

Engine misses under load

Spark plug failed - Test spark plug.
Carburetor is not adjusted correctly - Adjust carburetor as required.
Ignition coil not working - Replace defective component.

Engine overheats

Engine runs under excessive load - Reduce loads.
Air intake screen blocked - Clean and wash dirty components.
Too little or too much oil - Checking oil level and oil pressure.
Low quality engine oil - Change oil.
Inspect crankshaft to main bearing clearance.
Too Fast idle - Adjust carburetor for slower idle speed.

Engine does not idle

Spark plug is loose - Check spark plug gap.
Spark plug worn out - Check the spark and change defective spark.

John Deere X125 Engine knocking

Stale gasoline - Use proper fuel.
Engine overload - Reduce the load.
Lack of engine oil - Add engine oil.
Engine speed too low - Adjust the speed.
Piston rings and cylinder bore are wear - Replace defective components.
Check for engine overheating from plugged cooling fins.
Checking and adjusting valve clearance.
Check for carbon build-up in combustion chamber.

Engine backfires

Check spark plug for fouled.
Inspect and adjust choke.
Checking and adjusting carburetor.
Inspect and adjust ignition coil air gap.
Check inlet and outlet valves.
Check valve clearance, adjust if required.
Check flywheel key.

Loss of power

Engine overheats - Replace air cleaner.
Too much oil in engine - Excess oil must be drained.
Fuel pump is damage - Testing fuel pump output.
Defective governor - Repair or replace governor.
Check carburetor float adjustment.
Checking engine compression.

Engine using too much gasoline

Choke doesn't open well - Check throttle cable.
Carburetor malfunction - Adjust carburetor.

Exhaust with black smoke

Air cleaner element clogged - Clean or change filter.
Throttle is partially engaged - Inspecting and adjusting throttle.
Inspect carburetor needle valve and seat for wear or damage.

John Deere X125 Electrical Troubleshooting

Starter does not run

Main fuse defective - Fit new fuse.
Battery contacts are corroded - Clean terminals.
Low charging voltage - Charge the battery.
Ignition switch is damaged - Installing new lock.
Damaged starter - Change the starter.
Wiring damage - Connect wires.

Battery doesn't charge

One or more battery cells dead - Replace the battery.
Battery terminals and cables are dirty - Check and Clean.

No Lights work

Connection/disconnection level in wrong position.
lamp defective.
Wiring short circuit.

JD X125 Machine Troubleshooting

Excessive tractor vibration

Attachment drive belts worn or damaged - Belt replacement required.
Worn traction drive belt - Check and replace belt.
Dirt on driven pulley - Change if necessary.
Unbalancing or bending of blades - Replace defective blades.

Machine does not move while engine is running

Parking brake holds the tractor - Release the parking brake.
Bypass valve lever activated - Set bypass valve to the off position.
Blades loose - Fasten the blades securely.
Blades are unbalanced - Balance the mower blades correctly.
Lack of oil in transmission - Add oil to the transmission.

John Deere X125 Lawnmower Troubleshooting

Discharge Chute Plugged

Traveling too fast - Do not use high speed.
Grass too long - Adjust cutting height.
The grass is wet - Do not use the mower if grass is wet.
Engine rpm too low - The choke is not fully opening.
Restricted air flow - Set higher revs.
Lack of cutting height - Adjust cutting settings.
Belt installed improperly - Install the belt correctly.

Streaking of uncut grass

Mower's cutting deck is clogged - Clean mower deck.
Damaged blade - Installing new blade.
Mower deck is low from ground - Deck leveling required.
Grass bag overfilled - Clean bagger.
Speed is very fast - Do not use high speed.

Slipping drive belt

Dirt in the pulley - Pulley cleaning required.
Belt is worn out - Check and change damaged belt.
Belt tension improper - Install the belt correctly.

Excessive mower vibration

Debris on mower deck or in sheaves - Clean deck and pulley from debris.
Pulley or belt faulty - Replace worn parts.
Belt or sheaves out of centering - Inspect and align.
The blades are unbalanced - Adjust blade balance.

Blades scalping grass

Cutting height too low - Raise cutting height.
Mower wheels not adjusted correctly - Adjust front or back wheel height.
Tire pressure is uneven - Inflate tires as required.
High blade speed during mowing - Balance mower speed.
Bent mower blades - Replace blades.

Uneven Cut

Mower deck not leveled properly - Checking and adjust deck height.
Tire pressure unequal - Increase tire pressure.
Incorrect rollers height - Adjust rear or front wheel height.
Gear too high - Operate the mower at low speed.
Blades dull - 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