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John Deere E120 Troubleshooting

JD E120 Engine Problems

Tractor engine will not start

Fuel tank is empty - Fill fuel up.
Low-quality gasoline - Change fuel.
Old gasoline - Drain gasoline and change with fresh.
Dirt and debris in fuel system - Remove debris and dirt.
Plug connection defective - Check wires connection.
Faulty spark plug - Clean, adjust gap or replace.
Plugged fuel filter - Fuel filter needs to be replaced.
Brake pedal not pushed down - Push the brake pedal down.
Carburetor is not working properly - Inspect and adjust.
Check starter cranking RPM. Check and adjust valve clearance.

Gas engine long starting

Spark plug malfunction - Inspect the spark, replace if necessary.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Clogged fuel lines - Servicing fuel system.
Throttle cable is not adjusted correctly - Check and adjust.
Stale or incorrect gasoline - Fill in proper fuel.
Electrical wiring worn out - Check and replace.
Failing starter - Inspect the starter and change defective parts.

Engine stalling, surging or running rough

Cooling fins blocked - Clean cooling fins.
Electrical connections damaged - Check and repair defective connections.
Ignition adjust incorrect - Test ignition and spark plug.
Choke cable sticking - Check and change if required.
Air filter element clogged - Clean or replace the air filter.

Engine stops or misses

Spark plug worn out - Test spark plug.
Carburetor problems - Test and repair.
Ignition coil not working - Replace defective component.

Engine overheating

Engine runs under excessive load - Reduce loads.
Air intake screen blocked - Clean clogged components.
Engine oil low or too high - Inspect oil pump for damage or worn.
Low quality engine oil - Change engine oil.
Inspect crankshaft to main bearing clearance.
Too Fast idle - Adjust fast idle.

Engine will not idle

Poor spark plug contact - Adjust spark plug gap.
Faulty spark plug - Test spark and change as required.

John Deere E120 Engine knocking

Low octane fuel - Use correct gasoline.
Excessive engine load - Reduce the load.
Low oil level - Add engine oil.
Engine runs at low revs - Adjust the speed.
Piston rings and cylinder bore are wear - Inspect and replace if required.
Inspect for engine overheats from clogged cooling fins.
Checking and adjusting valve clearance.
Check for loose or worn connecting rods.

Engine backfires

Inspect spark plug and change if required.
Adjust or change the throttle.
Checking and adjusting carburetor.
Inspect and adjust ignition coil air gap.
Inspect for sticking valves.
Inspect and set valve clearance.
Inspect flywheel key.

Engine loses power

Engine overheating - Clean or replace air filter.
Too much oil in engine - Drain excess oil.
Fuel pump is not working properly - Test fuel pump output.
Faulty governor - Checking and adjusting governor.
Inspect carburetor for plugged passages.
Test engine compression.

Excessive fuel consumption

Choke is not fully open - Adjust choke cable.
Carburetor is not adjusted - Check carburetor float adjustment.

Black exhaust smoke

Air cleaner is dirty or oiled - Clean or replace filter.
Choke not fully engaged - Inspecting and adjusting throttle.
Inspect carburetor needle valve and seat for wear or damage.

JD E120 Electrical System Troubleshooting

Starter does not run

Fuse is defective - Installing new fuse.
Battery terminals are corroded - Clean terminals.
Weak battery - Need to charge the battery.
Ignition switch defective - Install new switch.
Faulty starter - Repair or replace.
Wiring disconnected - Change wiring.

Battery will not charge

One or several cells defective - Fit new battery.
No contact between cable and battery terminal - Check and Clean.

No Lights work

Light connector defective.
Check lamps.
Short-circuit in cable.

John Deere E120 Machine Problems

The machine vibrates

Implements drive belts damaged or worn - Inspect and replace damaged belt.
Traction drive belt damage - Install new belt.
Dirt on driven pulley - Installing a new pulley.
Unbalancing or bending of blades - Change defective blades.

Tractor will not move with engine running

Parking brake locked - Release the parking brake.
Bypass valve lever is engaged - Disengage the bypass valve lever.
Mower blades are loose - Fasten the blades securely.
Blades are unbalanced - Check mower blade balancing.
Transmission oil is low - Pour oil as required.

John Deere E120 Lawn Mower Troubleshooting

Clogged discharge chute

Speed too high - Choose recommended speed.
Grass Too Tall - Adjusting cutting height.
Grass too wet - Wait until later to cut.
Engine runs at low revs - Open throttle wide.
Lack of air flow - Set higher revs.
Mower deck set to low cutting - Use higher cutting.
Improper belt installation - install belt as required.

Patches of grass uncut

Clog in discharge area - Clean mower deck.
Blades dull or damaged - Checking for blade fault and change if required.
Mower deck is low from ground - Leveling the mower deck.
Grass bag too full - Empty the grass bag.
Speed is very fast - Need to reduce speed.

Belt Slipping

Pulley is dirty - Check and clean.
Belt is damaged - Inspect and replace worn belt.
Belt tension improper - Check and adjusting belt tension.

Mower vibrates

Debris in sheaves or on mower deck - Remove debris from deck or pulley.
Damaged sheaves or belt - Install new components.
Misaligned belt or pulley - Check and align.
No blade balance adjustment - Balance the blades.

Blade strips grass

Cutting height too low - Set the correct cutting height.
Mower rollers height wrong - Adjust mower deck wheels.
Tire pressure is uneven - Increase tire pressure.
Faster mower blade speeds - Blade speed required.
Bent blades during operation - Install new blades.

Uneven cutting results

Mower deck not level - Deck leveling required.
Tire pressure uneven - Need to inflate tires.
Wheels not positioned correctly - Check the rollers heights.
Ground speed too fast - Operate the mower at low speed.
Mower blades blunt - Sharpen or replace 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