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John Deere D140 Troubleshooting

JD D140 Engine Problems

Engine fails to start

Empty fuel tank - Fill it up.
Low-quality gasoline - Use quality fuel.
Stale gas - Drain fuel and add fresh.
Clogged fuel system - Remove clogging.
Faulty spark plug wire - Check wires connection.
Spark plug damaged - Test ignition spark.
Fuel filter is clogged - Fit new filter.
Safety contact for brake pedal defective - Install new part.
Carburetor problems - Carburetor diagnostics required.
Test fuel transfer pump output. Test crankcase vacuum.

Engine is difficult to start

Spark plug worn out - Test spark and replace as required.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Clogged fuel lines - Servicing fuel system.
Worn throttle cable - Replace as required.
Stale or improper gasoline - Pour quality fuel.
Electrical wires are damaged - Checking and replace.
Starter problems - Inspect the starter and change defective parts.

Rough running engine

Plugged cooling fins - Clean and wash cooling fins.
Electrical connections damaged - Check and restore defective connections.
Ignition setting defective - Check ignition system and adjust as required.
Choke cable sticking - Check and repair.
Air filter dirty - Clean or change air filter.

Engine stops or misses

Faulty spark plug - Inspect spark plug wire.
Carburetor problems - Test and repair.
Ignition coil defective - Test ignition coil and replace if necessary.

John Deere D140 Engine overheats

Engine overloaded - Reduce loads.
Air intake screen blocked - Clean clogged components.
Engine oil high or too low - Add or drain oil.
Poor quality oil - Change oil.
Check connecting rod to crankshaft bearing clearance.
Fast idle speed - Adjust carburetor idle mixture screw.

Engine will not idle

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

Engine knocks

Low octane fuel - Use correct fuel.
Engine overloaded - Reduce the load.
Oil level low - add oil as required.
Low engine speed - Adjust carburetor.
Cylinder bore or piston rings are damaged - Inspect and replace if required.
Check for engine overheating from plugged cooling fins.
Checking and adjusting valve clearance.
Check for carbon build-up in combustion chamber.

Engine back-fire

Checking spark plug.
Inspect and adjust choke.
Check and adjust carburetor.
Inspect and adjust ignition coil air gap.
Inspect for sticking valves.
Check and adjust valve clearance.
Inspect flywheel key.

Insufficient engine power

Engine overheating - Change air filter.
Too much oil in engine - Excess oil needs to be drained.
Fuel pump is damage - Check fuel pump and replace if required.
Faulty governor - Inspect and repair governor.
Check and overhaul carburetor.
Check engine compression.

Engine uses too much fuel

Choke didn't open fully - Check throttle cable.
Carburetor problems - Adjust carburetor.

Black smoke is emitted during operation

Air cleaner is dirty or oiled - Clean or replace filter.
Throttle is partially engaged - Inspect and adjust choke.
Checking and adjusting carburetor float level.

John Deere D140 Electrical System Troubleshooting

Starter motor will not turn engine

Blown fuse - Install new fuse.
Battery contacts are corroded - Inspect and clean terminals.
Weak battery - Battery charging required.
Ignition switch problems - Replace the lock.
Starter is not working - Replace or repair.
Wiring disconnected - Change wiring.

Battery doesn't charge

Faulty cell in battery - Install new battery.
Poor contact between cable and battery pole - Inspect and Clean.

No Lights work

Light connector defective.
Bulbs defective.
Short circuit in electrical wires.

JD D140 Machine Problems

Tractor vibrates excessively

Attachment driven belt worn or damaged - Check and replace worn belt.
Traction drive belt worn - Install new belt.
Drive sheaves malfunction - if required.
Bent cutting blade or no balance - Change as needed.

Tractor doesn't move when engine runs

parking brake blocks the tractor - Release the parking brake.
Bypass valve lever is engaged - Disengage the bypass valve lever.
Mower blades are loose - Tighten mower blades.
Incorrect blade balance - Check blade balancing.
Lack of oil in transmission - Pour oil as required.

John Deere D140 Mower Deck Troubleshooting

Clogged discharge chute

Traveling too fast - Choose recommended speed.
Grass has grown too long - try operating a short cutting height.
Grass too wet - Do not mow when grass is wet.
Engine speed reduced - Increase engine speed.
Lack of air flow - Set higher revs.
Mower deck set to low cutting - Change cutting height.
Incorrect belt installation - Check belt installation.

Uncut grass during operation

Clog in discharge area - Inspect and clean cutting deck.
Excessive blade wear - Installing new blade.
Deck too low - Level mower deck.
Bagger too full - Empty the grass bag.
Speed is very fast - Choose recommended speed.

Belt slips

Sheave is dirty - Clean or replace.
Drive belt wear - Fit new belt.
Poor belt tension - Adjust belt tension.

Mower vibrates

Mower clogged or in pulleys - Clean sheave and deck from clogging.
Worn belt or sheave - Replace defective components.
Misaligned belt or pulley - Inspect and align.
Blades out of balance - Blades need balancing.

Blades scalping grass

Cutting height incorrect - Set the proper cutting height.
Mower wheel height incorrect - Adjust mower deck wheels.
Low tire pressure - Tire pressure required.
High blade speed during mowing - Balance mower speed.
Blades are bent - Replace blades.

Uneven Cut

Mower deck not leveled properly - Deck leveling required.
Low tire inflation - Need to inflate tires.
Wrong wheel position - Adjust rear or front wheel height.
Operating at a faster ground speed - Choose recommended speed.
Blades blunt - 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