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John Deere LX178 Troubleshooting

JD LX178 Engine Troubleshooting

Tractor engine starting problems

Fuel tank is empty - Add fuel.
Improper fuel grade - Change gasoline.
Old fuel - Drain gasoline and add fresh.
Clogged fuel system - Remove clogging.
Spark plug wires are damaged - Check wires connection.
Spark plug not working - Clean, adjust gap or replace.
Dirty fuel filter - Fuel filter needs to be replaced.
Brake pedal not depressed - Press the brake pedal.
Carburetor is not working properly - Inspect and adjust.
Test fuel transfer pump output. Test crankcase vacuum.

Engine hard starting

Spark plug failed - Check the spark and replace defective spark.
Carburetor not adjusted - Adjust according to instructions.
Clogged fuel pipes - Service required.
Choke cable damaged - Replacement required.
Stale or improper fuel - Pour quality fuel.
Electrical wires are damaged - Checking and replace.
Starter is not working - Inspect the starter and change defective parts.

Engine runs unevenly

Cooling fins blocked - Clean and wash cooling fins.
Loose electrical connections - Check and replace defective connections.
Ignition system problems - Test ignition and spark plug.
Throttle cable sticking - Repair or replace.
Air filter element clogged - Clean air filter.

Engine runs but misses

Spark plug fail - Check spark plug for fouled condition and proper gap.
Carburetor is not adjusted correctly - Adjust carburetor as required.
Ignition coil air gap incorrect - Check and adjust ignition coil air gap.

John Deere LX178 Engine overheating

Engine overloaded - Reduce the load.
Air intake screen plugged - Clean clogged components.
Too much or too little oil - Inspect oil level.
Improper engine oil viscosity - Change oil.
Inspect crankshaft to main bearing clearance.
Idle speed problems - Adjust carburetor idle mixture screw.

Engine does not idle

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

Engine knocking

Low octane fuel - Use proper fuel.
Engine overloaded - Reduce loads.
Oil level low - Check oil level and add if necessary.
Engine runs at low revs - Adjust carburetor as needed.
Cylinder bore and rings are wear - Inspect and replace if required.
Check for engine overheating from plugged cooling fins.
Check and adjust crankshaft end play.
Check for worn crankshaft or camshaft bearings.

Engine back-fire

Check spark plug and replace if necessary.
Adjust or change the throttle.
Adjust carburetor idle mixture screw.
Check and adjust ignition coil air gap.
Inspect for sticking valves.
Inspect and set valve clearance.
Checking flywheel key.

Engine does not develop full power

Engine overheating - Change air filter.
Too much oil in engine - Excess oil needs to be drained.
Defective fuel pump - Repair or replace fuel pump.
Faulty governor - Inspect and adjust governor.
Check carburetor float adjustment.
Check engine compression.

Engine using too much gasoline

Choke doesn't open well - Replace throttle cable.
Carburetor is not adjusted - Adjust carburetor.

Black smoke is emitted during operation

Air filter element clogged - Clean or replace filter.
Throttle not fully engaged - Inspecting and adjusting choke.
Check for correct main jet for elevation.

John Deere LX178 Electrical System Troubleshooting

Starter doesn't work or will not turn engine

Fuse is defective - Installing new fuse.
Terminals are severely corroded and heat up - Clean terminals.
Low battery voltage - Battery charging required.
Ignition switch problems - Change switch.
Faulty starter - Replace or repair.
Wiring damage - Reconnect wires.

Battery does not charge

Battery cells defective - Install new battery.
Poor contact between cable and battery pole - Clean or replace cable.

Lighting does not function

Light plug defective.
Replace the lamps.
Wiring short circuit.

JD LX178 Machine Problems

Tractor vibrates excessively

Implements drive belts damaged or worn - Belt replacement required.
Traction drive belt damage - Fit new belt.
Drive pulley malfunction - if required.
The mower deck blades are bent or unbalanced - Replace defective blades.

Tractor will not move with engine running

Parking brake holds the tractor - Release the parking brake.
Bypass lever is on - Deactivate the bypass valve.
Loose lawnmower blades - Checking blades for loose bolts.
Unbalance in one or both blades - Check blade balancing.
Lack of oil in transmission - Check transmission oil lever.

John Deere LX178 Mower Deck Troubleshooting

Discharge Chute Clogged

Operating at a faster ground speed - Need to reduce speed.
Too high grass for mowing - Adjusting cutting height.
Wet grass - Wait until the grass dries.
Low engine speeds - Adjust carburetor to higher rpm.
Airflow restriction - Check engine rpm.
Mower cuts too low - Adjust to higher cutting.
Improper belt installation - Fit belt correctly.

Streaking of uncut grass

Clog in discharge area - Need to clean the mower deck.
Defective blade - Check for blade damage and replace if necessary.
Deck level is too low - Leveling the mower deck.
Grass bagger overfilled - Clean grass bag.
Speed is very high - Choose recommended speed.

Slipping drive belt

Debris in pulleys - Check and clean.
Belt is loose - Inspect and replace worn belt.
Belt tension is incorrect - Install the belt correctly.

Excessive mower vibration

Debris on mower deck or in sheaves - Remove clogging from mower deck or sheaves.
Belt or sheaves faulty - Change damaged parts.
Pulleys or belt misaligned - Inspect and centering.
Incorrect blade balancing - Balance blades properly.

Blades scalping grass

Wrong cutting height - adjust cutting height.
Mower rollers height wrong - Adjust mower deck wheels.
Tire pressure is uneven - Tire pressure required.
Blades speed too fast - Blade speed required.
Blades are bent - Remove bent blade and fit new one.

Uneven Cut

Deck level is too low - Checking and adjust deck height.
Low tire pressure - Check and inflate the tires.
Incorrect wheel height - Adjust wheel heights correctly.
Speed too high - Don't use fast speed.
Mower blades dull - Installing new blade.

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