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John Deere D150 Tractor Troubleshooting

John Deere D150 Engine Problems

Tractor engine will not start

Empty gas tank - Fill fuel up.
Improper fuel grade - Use correct fuel grade.
Old gas - Drain fuel and fill up fresh.
Dirty fuel lines - Inspect and clean.
Spark plug wires are damaged - Check wires connection.
Spark plug damaged - Test ignition spark.
Plugged fuel filter - Change fuel filter.
Faulty safety switch - Change damaged switch.
Incorrect carburetor adjustment - Adjust carburetor idle mixture screw.
Check and adjust governor linkage. Test crankcase vacuum.

Gas engine long starting

Faulty spark plug - Test spark and replace as required.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Clogged fuel lines - Clean fuel system components.
Worn throttle cable - Replace as required.
Old or improper fuel - Pour quality gasoline.
Electrical connections are damaged - Inspect and change.
Starter is not working - Check starter, repair or replace.

Engine runs unevenly

Cooling fins blocked - Clean and wash cooling fins.
Loose electrical contacts - Check and restore damaged connections.
Ignition adjustment lost - Inspect spark plug and ignition system.
Choke cable sticks - Repair or change as needed.
Air filter blocked - Replace air cleaner.

John Deere D150 Engine misses

Spark plug fail - Check spark plug for fouled condition and proper gap.
Carburetor defective or not adjusted - Repair or adjust.
Ignition coil not working - Replace defective component.

Engine overheating

Engine runs under excessive load - Reduce the load.
Air intake screen blocked - Clean dirty components.
Too much or too little oil - Add or drain oil.
Improper engine oil viscosity - Change oil.
Check connecting rod to crankshaft bearing clearance.
Idle speed problems - Adjust fast idle.

Engine will not idle

Poor spark plug contact - Tighten the spark plug correctly.
Spark plug failed - Test spark and change as required.

Engine knocks

Stale fuel - Use proper fuel.
Engine overload - Reduce loads.
Oil level low - Add engine oil.
Low engine speed - Adjust the speed.
Cylinder bore or piston rings are damaged - Check cylinder bore and rings for wear.
Inspect for engine overheats from clogged cooling fins.
Inspect and adjusting crankshaft end play.
Check for worn crankshaft or camshaft bearings.

Engine back-fire

Checking spark plug.
Inspect and adjust choke.
Adjust carburetor idle mixture screw.
Check and adjust ignition coil air gap.
Inspect inlet and outlet valves.
Test valve clearance, adjusting if necessary.
Inspecting flywheel key.

JD D150 Engine loses power

Engine overheats - Change air filter.
High engine oil - Drain excess oil.
Faulty fuel pump - Check fuel pump and replace if required.
Faulty governor - Inspect and repair governor.
Inspect carburetor for plugged passages.
Checking engine compression.

Engine using too much gasoline

Insufficient choke opening - Replace throttle cable.
Incorrect carburetor adjustment - Adjust or repair carburetor.

Emits black smoke

Air cleaner element clogged - Clean or change filter.
Choke partially engaged - Inspecting and adjusting throttle.
Check and adjust carburetor float level.

John Deere D150 Electrical System Troubleshooting

Starter motor will not turn engine

Main fuse malfunction - Check and change.
Terminals are severely corroded and heat up - Clean contacts.
Low-voltage battery - Battery charging required.
Ignition switch is damaged - Replace switch.
Damaged starter - Install new starter.
Wiring damage - Reconnect wires.

Battery does not charge

Battery cells fails - Fit new battery.
Battery terminals and cables are dirty - Replace or clean cable.

Lights do not work

Connection/disconnection level in wrong position.
Bulbs defective.
Short circuit in electrical wires.

JD D150 Machine Problems

Tractor vibrates too much or rattles excessively

Attachment driven belt worn or damaged - Check and change worn belt.
Worn traction drive belt - Check and replace belt.
Drive sheaves malfunction - Change if necessary.
Unbalancing or bending of blades - Replace defective blades.

The engine is running but tractor is not moving

Parking brake holds the tractor - Disengage the park brake.
Bypass valve lever is engaged - Deactivate the bypass valve.
Mower blade could be loose - Tighten mower blades.
Unbalance in one or both blades - Check blades for damage and balance as required.
Transmission oil too low - Add oil to the transmission.

John Deere D150 Lawn Mower Troubleshooting

Discharge Chute Plugged

Traveling too fast - Do not use high speed.
Too high grass for mowing - Adjust the mower to a lower cutting height.
Wet grass - Do not mow when grass is wet.
Engine is running at too low speed - Adjust choke to full opening.
Airflow restriction - Check engine rpm.
Mower deck set to low cutting - Adjust cutting settings.
Incorrect belt installation - Install the belt correctly.

Patches of grass uncut

Mower deck clogged - Inspect and clean cutting deck.
Blade wornout - Inspect and fit new blade if required.
Deck too low - Deck leveling required.
Grass bag overfilled - Empty bagger.
Traveling too fast - Use slower speed.

Belt slips

Debris in sheaves - Recommend cleaning the sheaves.
Belt is damaged - Install new belt.
Belt tension is incorrect - Adjust belt tension.

Excessive mower vibration

Debris in sheaves or on mower deck - Clean sheave and deck from clogging.
Worn pulley or belt - Replace worn components.
Belt or sheaves out of centering - Inspect and adjust.
Blades out of balance - Blade balance required.

Blades scalp grass

Cutting height too low - Check and adjust height.
Mower rollers height wrong - Adjust mower deck wheels.
Tires inflated insufficient - Tire pressure required.
Higher blade speed - Adjust the blade speed.
Blades are bent - Install new blades.

Uneven Cut

Deck too low - Deck leveling required.
Low tire pressure - Increase tire pressure.
Rollers not positioned properly - Check wheel adjustment.
Traveling too fast - Need to reduce speed.
Blades dull - Check and replace the 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