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John Deere X728 Lawn Tractor Troubleshooting

John Deere X728 Engine Troubleshooting

Kawasaki engine will not start

Empty gas tank - Add fuel.
Wrong grade of gasoline - Change fuel.
Stale fuel - Drain fuel and fill up fresh.
Air or water in fuel system - Remove water or air from fuel system.
Spark plug defective - Check wires connection.
Faulty spark plug - Clean, adjust gap or replace.
Fuel filter is clogged - Fuel filter needs to be replaced.
Defective safety switch - Replace if required.
Carburetor is not adjusted - Check carburetor float adjustment.
Inspect and adjust throttle cable. Test crankcase vacuum.

Engine starts hard

Spark plug fail - Inspect the spark, replace if necessary.
Carburetor is dirty - Wash, clean and adjust.
Clogged fuel pipes - Servicing fuel system.
Throttle cable damaged - Change the cable.
Old or improper fuel - Pour quality fuel.
Electrical wires are damaged - Inspect and replace.
Starter problems - Test starter and repair if necessary.

Engine stalling, surging or running rough

Cooling fins blocked - Clean cooling fins.
Loose electrical contacts - Inspect and replace defective contacts.
Ignition setting defective - Check ignition and adjust if necessary.
Throttle cable sticks - Check and repair.
Air cleaner dirty - Clean or change air filter.

Engine misses under load

Spark plug malfunction - Change spark plug.
Carburetor defective or not adjusted - Repair or adjust.
Ignition coil defective - Test ignition coil and replace if necessary.

Kawasaki engine overheating

Engine overloaded - Reduce loads.
Air inlet or cooling fins blocked - Clean clogged components.
Engine oil high or too low - Checking oil level and oil pressure.
Low quality engine oil - Change oil.
Check internal bearing clearance.
Fast idle speed - Adjusting fast idle speed.

Engine does not idle

Spark plug is loose - Tighten the spark plug correctly.
Faulty spark plug - Test spark and change as required.

Engine knocking

Stale fuel - Change fuel.
Excessive engine load - Reduce loads.
Oil level low - Add engine oil.
Engine is running at low revs - Adjust carburetor as needed.
Piston rings and cylinder bore worn - Inspect and replace if required.
Check for engine overheating from plugged cooling fins.
Check and adjust valve clearance.
Check for loose or worn connecting rods.

Kawasaki engine back-fire

Checking spark plug.
Check and adjust the 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.

Engine lacks power

Engine overheats - Change air filter.
High engine oil - Excess oil needs to be drained.
Faulty fuel pump - Test fuel pump output.
Governor problems - Inspect and repair governor.
Check and overhaul carburetor.
Checking engine compression.

Engine getting too much fuel

Throttle did not open fully - Replace choke cable.
Incorrect carburetor adjustment - Check carburetor float adjustment.

Exhaust with black smoke

Air filter element plugged - Check and clean.
Choke not fully engaged - Inspect and adjust throttle.
Check for correct main jet for elevation.

John Deere X728 Electrical System Troubleshooting

Starter motor will not turn engine

Main fuse malfunction - Install new fuse.
Battery contacts are corroded - Clean terminals.
Low battery voltage - Need to charge the battery.
Ignition lock problems - Install new switch.
Starter fault - Change the starter.
Electrical wires are damaged - Replace wiring.

Battery will not charge

Faulty cell in battery - Install new battery.
No contact between cable and battery terminal - Change or clean cable.

Lights do not work

Headlight wire connector disconnected.
Replace light bulbs.
Inspect electrical wires for short- circuit.

John Deere X728 Machine Troubleshooting

Excessive tractor vibration

Equipment driven belt worn out - Inspect and change damaged belt.
Traction drive belt damage - Inspect and replace traction belt.
Drive sheaves malfunction - Change if necessary.
Mower blades problem - Replace damaged blades.

Tractor doesn't move when engine runs

The parking brake is locked - Release the park brake.
Bypass valve lever activated - Deactivate the bypass valve.
Mower blades are loose - Checking blades for loose bolts.
Poor blade balancing - Balance the blades correctly.
Too little transmission oil - Add transmission oil.

John Deere X728 Lawn Mower Problems

Plugged discharge chute

Speed too high - Operate the mower at low speed.
High grass - Adjusting cutting height.
The grass is wet - Don't mow while wet grass.
Low engine speeds - Increase engine speed.
Restricted air flow - Check engine rpm.
Cutting too low - Use higher cutting.
Belt is loose - Check belt installation.

Uncut grass during operation

Mower deck clogged - Need to clean the mower deck.
Excessive blade wear - Install new blade.
Deck too low - Adjust and level the deck height.
Grass bagger overfilled - Empty bagger.
Ground speed too fast - Use slower speed.

Belt slips

Debris in pulleys - Clean or replace.
Drive belt damage - Check and change damaged belt.
Belt tension is incorrect - Install the belt correctly.

Too much mower vibration

Mower deck clogged or in sheaves - Clean sheave and deck from clogging.
Damaged sheaves or belt - Replace worn components.
Belt or sheaves no adjustment - Check and align.
Incorrect blade balancing - Adjust blade balance.

Blades scalp grass

Wrong cutting height - Set the correct cutting height.
Mower rollers height wrong - Check the wheel heights.
Insufficient tire pressure - Tire pressure required.
Blades speed too fast - Correct blades speed.
Bent mower blades - Replace blades.

Uneven cutting results

Deck too low - Leveling the mower deck.
Tire pressure uneven - Check and inflate the tires.
Wrong wheel position - Adjust wheel heights correctly.
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