Specifications, Service and Repair of Farm and Lawn Tractors

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John Deere X738 Troubleshooting

John Deere X738 Engine Problems

Tractor engine doesn't start

No gasoline in tank - Fill it up.
Improper fuel grade - Use quality gasoline.
Stale fuel - Drain gasoline and change with fresh.
Air or water in fuel system - Remove water or air from fuel system.
Spark plug wires are damaged - Check wires connection.
Spark plug damaged - Replace as required.
Clogged fuel filter - Fuel filter needs to be replaced.
Faulty safety switch - Change damaged switch.
Carburetor problems - Carburetor diagnostics required.
Inspect and adjust throttle cable. Check the Valves and Compression System.

Engine starts hard

Spark plug wear - Test spark and change as required.
Carburetor settings incorrect - Adjusting as required.
Dirt in fuel lines - Clean the system carefully.
Choke cable damaged - Replacement required.
Old or incorrect fuel - Fill in correct fuel.
Electrical connections are damaged - Inspect and replace wiring as needed.
Failing starter - Inspect the starter and change defective parts.

Engine runs unevenly

Clogged cooling fins - Clean and wash cooling fins.
Loose electrical contacts - Inspect and restore defective contacts.
Incorrect ignition settings - Check ignition system and adjust as required.
Choke cable sticking - Repair or change as needed.
Air filter dirty - Change air cleaner.

Engine misses under load

Faulty spark plug - Inspect spark plug wire.
Carburetor defective or not adjusted - Repair or adjust.
Ignition coil is damaged - Inspect ignition coil and change if required.

Engine overheating

Engine runs under excessive load - Reduce the load.
Air intake screen clogged - Clean clogged components.
Too much or too little oil - Checking oil level and oil pressure.
Poor quality oil - Change oil.
Check internal bearing clearance.
Idle speed problems - Adjust fast idle.

Engine doesn't idle speed

Poor spark plug contact - Check spark plug gap.
Faulty spark plug - Check the spark and change defective spark.

JD X738 Engine knocks

Stale or low octane fuel - Change fuel.
Excessive engine load - Reduce the load.
Oil level low - add oil as required.
Engine is running at low revs - Adjust the required speed.
piston rings or cylinder bore damaged - Inspect and replace if required.
Check for engine overheating from plugged cooling fins.
Check and adjust crankshaft end play.
Check for loose or worn connecting rods.

Engine back-fire

Check spark plug for fouled.
Adjust or change the choke.
Check and adjust carburetor.
Inspect and adjust ignition coil air gap.
Check for sticking valves.
Check and adjust valve clearance.
Inspect flywheel key.

Insufficient engine power

Engine overheats - Clogged air filter element.
Excess engine oil - Remove excess oil.
Defective fuel pump - Repair or replace fuel pump.
Governor is damage - Inspect and adjust governor.
Check carburetor float adjustment.
Checking engine compression.

Excessive fuel consumption

Insufficient throttle opening - Adjust throttle cable.
Incorrect carburetor adjustment - Adjust carburetor.

Emits black smoke

Air filter element clogged - Clean or replace filter.
Throttle not fully engaged - Replace or repair choke.
Check for correct main jet for elevation.

JD X738 Electrical System Troubleshooting

Starter does not run

Main fuse defective - Check and replace.
Poor terminal connection - Clean contacts.
Low battery voltage - Battery charging required.
Ignition lock is damaged - Install new switch.
Starter is not working - Change the starter.
Wiring damage - Replace wiring.

Battery will not charge

Battery cells defective - Fit new battery.
Battery terminals and cables are dirty - Change or clean cable.

No Lights work

Connection/disconnection level in wrong position.
Check light bulbs.
Check wiring for short circuit.

John Deere X738 Machine Troubleshooting

Tractor vibrates excessively

Equipment drive belts worn out - Check and replace worn belt.
Traction drive belt worn - Install new belt.
Dirt on driven pulley - Clean the sheaves.
Unbalancing or bending of blades - Replace damaged blades.

Engine runs but tractor won't move

Parking brake holds the tractor - Unlock park brake.
Bypass valve lever is engaged - Set bypass valve to the off position.
Loose lawnmower blades - Checking blades for loose bolts.
Unbalance in one or both blades - Check mower blade balancing.
Too little transmission oil - Check transmission oil lever.

John Deere X738 Lawn Mower Troubleshooting

Plugged discharge chute

Travel speed too fast - Do not use high speed.
Grass has grown too long - Adjust the mower to a lower cutting height.
Wet grass - Don't mow while wet grass.
Low engine speeds - The choke is not fully opening.
Lack of air flow - Set higher revs.
Mower deck set to low cutting - Change cutting height.
Improper belt installation - install belt as required.

Patches of grass uncut

Cutting deck clogging - Need to clean the mower deck.
Damaged or worn blade - Installing new blade.
Deck level is too low - Leveling the mower deck.
Grass bag overfilled - Empty bagger.
Speed is very high - Do not use high speed.

Belt Slipping

Pulley is dirty - Check and clean.
Worn belt - Inspect and replace worn belt.
Low belt tension - Belt tension needs to be adjusted.

Excessive mower vibration

Debris in sheaves or on mower deck - Clean pulley and deck from debris.
Damaged pulleys or belt - Change worn components.
Pulley or belt out of alignment - Inspect and centering.
Blades are not balanced correctly - Balance the blades.

Blade strips grass

Wrong cutting height - Raise cutting height.
Mower height wheels not adjusted - Adjust mower deck wheels.
Low tire pressure - Tire pressure required.
Higher blade speed - Adjust the speed of blades.
Bent blades during operation - Remove bent blade and fit new one.

Uneven cutting results

Mower deck low - Leveling the mower deck.
Tire pressure unequal - Increase tire pressure.
Wheels not positioned correctly - Adjust front or back wheel height.
Traveling too fast - Need to reduce speed.
Mower blade worn or bent - Sharpen or replace blade.

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JOHN DEERE LAWN TRACTORS SPECIFICATIONS

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ENGINES FOR JOHN DEERE LAWN TRACTORS

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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

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JOHN DEERE FRONT END LOADERS

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JD TRACTORS TROUBLESHOOTING
2640 3040 3310 3650 4100
5050D 5090R 5410 6105R 7200R
E130 L111 LA110 LT155 X300R

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JOHN DEERE FARM TRACTORS SPECIFICATIONS

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