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John Deere LA155 Tractor Problems

John Deere LA155 Engine Troubleshooting

Tractor engine doesn't start

Gas tank is empty - Fill it up.
Wrong grade of gasoline - Use quality gasoline.
Old gas - Drain fuel and add fresh.
Fuel system clogged - Repair or replace.
Defective spark plug wires - Check the spark plug wires.
Spark plug damaged - Check ignition spark.
Fuel filter is plugged - Fit new filter.
Safety contact for brake pedal defective - Install new part.
Carburetor problems - Carburetor diagnostics required.
Inspect and adjust throttle cable. Test crankcase vacuum.

Gas engine starts hard

Spark plug failed - Check the spark and replace defective spark.
Carburetor settings incorrect - Adjusting as required.
Clogged fuel pipes - Remove clogging from fuel pipes.
Throttle cable damaged - Change the cable.
Stale or incorrect gasoline - Fill in proper fuel.
Electrical connection problems - Checking and replace wiring if necessary.
Failing starter - Check starter, repair or replace.

John Deere LA155 Engine runs unevenly

Clogged cooling fins - Clean cooling fins.
Electrical contacts are damaged - Check and repair defective connections.
Ignition system problems - Test ignition and spark plug.
Choke cable sticking - Check and replace.
Air cleaner dirty - Change air cleaner.

Engine misses under load

Spark plug failed - Check spark plug for fouled condition and proper gap.
Carburetor defective or not adjusted - Repair or adjust.
Ignition coil defective - Test ignition coil and replace if necessary.

Engine overheats

Engine overloaded - Reduce loads.
Air inlet or cooling fins blocked - Clean and wash dirty components.
Too little or too much oil - Checking oil level and oil pressure.
Poor quality oil - Change engine oil.
Check connecting rod to crankshaft bearing clearance.
Too Fast idle - Adjust carburetor idle mixture screw.

Engine does not idle

Spark plug is loose - Tighten the spark plug correctly.
Spark plug fail - Test spark and replace as required.

John Deere LA155 Engine knocking

Stale fuel - Change gasoline.
Engine overloaded - Reduce loads.
Oil level low - Add engine oil.
Engine runs at low revs - Adjust the speed.
Cylinder bore and rings worn out - Replace defective components.
Check for engine overheating from plugged cooling fins.
Check and adjust crankshaft end play.
Check for worn crankshaft or camshaft bearings.

Engine back-fire

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

Engine loses power

Engine temperature too high - Change air filter.
Too much oil in engine - Excess oil needs to be drained.
Fuel pump problems - Repair or replace fuel pump.
Governor not work - Inspect and repair governor.
Inspect and repair carburetor.
Checking engine compression.

Excessive Fuel Consumption

Insufficient throttle opening - Inspect choke cable.
Carburetor is not working properly - Adjust carburetor.

Exhaust with black smoke

Air cleaner element clogged - Inspect and clean.
Throttle is partially engaged - Replace or repair choke.
Checking and adjusting carburetor float level.

JD LA155 Electrical System Troubleshooting

Starter does not function

Blown main fuse - Fit new fuse.
Battery terminals are corroded - Inspect and clean contacts.
Battery is discharged - Need to charge the battery.
Ignition lock problems - Installing new lock.
Starter is not working - Repair or replace.
Electrical wires are damaged - Replace electric wires.

Battery will not charge

Dead cell in the battery - Fit new battery.
Bad contact between battery pole and cable - Replace or clean cable.

No Lights work

Light plug disconnected.
Check lamps.
Short-circuit in cable.

JD LA155 Mechanical Troubleshooting

Tractor vibrates excessively

Equipment drive belts worn out - Inspect and change damaged belt.
Worn traction drive belt - Fit new belt.
Dirt on drive sheaves - Clean or replace.
Bent cutting blade or no balance - Replace defective blades.

Machine does not move while engine is running

parking brake blocks the tractor - Disengage the park brake.
Bypass valve lever activated - Disengage the bypass valve lever.
Blade becomes loose - Check mower blades and fasten as required.
Blades are unbalanced - Inspect the blades and balance if necessary.
Transmission oil is insufficient - Fill transmission with oil.

John Deere LA155 Lawnmower Problems

Discharge Chute Plugged

Speed too high - Choose recommended speed.
High grass - try operating a short cutting height.
Grass too wet - Do not mow when grass is wet.
Engine speed reduced - Open choke fully.
Restricted air flow - Set higher revs.
Cutting too low - Use higher cutting.
Incorrect belt installation - Check belt installation.

Uncut grass during operation

Mower deck clogged - Mower deck needs cleaning.
Defective blade - Check for blade damage and replace if necessary.
Mower deck low - Level mower deck.
Grass bag overfilled - Clean bagger.
Travel speed too fast - Do not use high speed.

Belt slips

Debris in pulleys - Pulley cleaning required.
Drive belt wear - Fit new belt.
Belt tension problems - Install the belt correctly.

The lawn mower vibrates excessively

Debris in mower deck or in pulleys - Remove debris from deck or pulley.
Damaged sheaves or belt - Change defective parts.
Pulleys or belt misaligned - Check and align.
Improper blade balancing - Balance blades correctly.

Blade strips grass

Incorrect height cutting - Set the proper cutting height.
Mower rollers not adjusted improperly - Adjust front or back wheel height.
Tire pressure is uneven - Increase tire pressure.
Blades speed too fast - Balance mower speed.
Bent blades during operation - Install new blades.

Uneven cutting results

Mower deck not level - Level mower deck.
Tire pressure unequal - Inflate tires as required.
Wrong wheel position - Adjust rear or front wheel height.
Operating at a faster ground speed - Don't use fast speed.
Mower blades dull - Check for blade damage and replace if necessary.

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