Specifications, Service and Repair of Farm and Lawn Tractors

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John Deere 320 - Problems and Solutions

John Deere 320 Engine Troubleshooting

Tractor engine doesn't start

No gasoline in tank - Fill fuel up.
Improper fuel grade - Change fuel.
Old gas - Drain gasoline and change with fresh.
Dirty fuel lines - Inspect and clean.
Spark plug defective - Check wires connection.
Spark plug damaged - Change as required.
Plugged fuel filter - Fit new filter.
Faulty safety switch - Change damaged switch.
Carburetor is clogged - Clean the carburetor.
Test fuel transfer pump output. Test compression.

Engine starts hard

Spark plug malfunction - Test spark and change as required.
Carburetor not adjusted - Adjust according to instructions.
Fuel lines are clogged - Clean the system carefully.
Choke cable not adjusted properly - Checking and adjusting.
Stale or incorrect gasoline - Pour quality fuel.
Electrical wires are damaged - Inspect and replace.
Starter fault - Test starter and repair if necessary.

Engine stalling, surging or running rough

Clogged cooling fins - Clean cooling fins.
Loose electrical contacts - Check and repair damaged connections.
Ignition setting defective - Check spark plug and ignition.
Choke cable sticks - Repair or replace.
Air cleaner dirty - Replace air cleaner.

Engine misses

Spark plug fail - Test spark plug.
Carburetor problems - Test and repair.
Ignition coil air gap incorrect - Check and adjust ignition coil air gap.

Engine overheats

Engine runs under excessive load - Reduce loads.
Cooling fins or air inlet plugged - Clean dirty components.
Too little or too much oil - Inspect oil pump for damage or worn.
Poor quality oil - Change oil.
Inspect crankshaft to main bearing clearance.
Idle speed problems - Adjust carburetor idle mixture screw.

Engine doesn't idle speed

Spark plug not gapped correctly - Adjust spark plug gap.
Spark plug worn out - Inspect the spark, change if necessary.

JD 320 Engine knocks

Low octane gasoline - Use correct gasoline.
Excessive engine load - Reduce loads.
Lack of engine oil - Check oil level and add if necessary.
Low engine speed - Adjust carburetor.
Cylinder bore and rings are wear - Replace damaged parts.
Check for engine overheating from plugged cooling fins.
Checking and adjusting valve clearance.
Check for loose or worn connecting rods.

Engine backfires

Check spark plug and replace if necessary.
Adjust or replace choke.
Checking and adjusting carburetor.
Checking and adjusting ignition coil air gap.
Check for sticking valves.
Test valve clearance, adjusting if necessary.
Inspect flywheel key.

Engine loses power

Engine overheats - Replace air cleaner.
Overfilling engine oil - Excess oil must be drained.
Defective fuel pump - Inspect and repair fuel pump.
Governor is damage - Inspect and repair governor.
Inspect and repair carburetor.
Test engine compression.

Excessive Fuel Consumption

Insufficient choke opening - Replace throttle cable.
Carburetor malfunction - Check and adjust carburetor.

Exhaust with black smoke

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

John Deere 320 Electrical System Troubleshooting

Starter motor will not turn engine

Fuse is defective - Installing new fuse.
Terminals are severely corroded and heat up - Clean terminals.
Low battery voltage - Charge the battery.
Ignition lock problems - Change the lock.
Faulty starter - Repair or replace.
Wires disconnected - Change wiring.

Battery will not charge

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

Lighting does not function

Headlight wire connector disconnected.
Check lamps.
Wiring short circuit.

JD 320 Machine Problems

The machine vibrates

Attachment drive belts worn or damaged - Check and replace worn belt.
Traction drive belt damage - Inspect and replace traction belt.
Dirt on drive sheaves - Installing a new pulley.
Bent cutting blade or no balance - Balance the blades or replace.

Engine runs but tractor won't move

Parking brake holds the tractor - Disengage the park brake.
Bypass valve pulled out - Set bypass valve to the off position.
Blade becomes loose - Fasten the blades securely.
Blades are unbalanced - Check blade balancing.
Too little transmission oil - Fill transmission with oil.

John Deere 320 Lawn Mower Troubleshooting

Clogged discharge chute

Lawn mower is driving too fast - Operate the mower at low speed.
High grass - Adjust the mower to a lower cutting height.
Grass too wet - Do not mow when grass is wet.
Engine rpm reduced - Adjust carburetor to higher rpm.
Loss of airflow - Set higher revs.
Low cutting height - Change cutting height.
Belt is loose - Reinstall the belt properly.

Patches of grass uncut

Cutting deck clogging - Mower deck needs cleaning.
Defective blade - Check and replace the blade.
Mower deck low - Checking and adjust deck height.
Grass bag too full - Clean grass bag.
Travel speed too fast - Need to reduce speed.

Slipping drive belt

Pulley is dirty - Recommend cleaning the sheaves.
Drive belt damage - Check and replace belt.
Belt tension improper - Adjust belt tension.

The lawn mower vibrates excessively

Debris in sheaves or on mower deck - Remove debris from the pulley or deck.
Sheaves or belt faulty - Replace defective components.
Pulleys or belt misaligned - Check and centering.
The blades are unbalanced - Blade balance required.

Blade strips grass

Cutting height incorrect - Set the correct cutting height.
Mower height wheels not adjusted - Adjust mower deck wheels.
Tires inflated insufficient - Inflate tires as required.
Higher blade speed - Blade speed required.
Bent mower blades - Remove bent blade and fit new one.

Uneven cutting results

Mower deck low - Level mower deck.
Tires inflated insufficient - Need to inflate tires.
Wrong rollers position - Check the wheel heights.
Ground speed too high - Choose recommended speed.
Blades blunt - Checking for blade fault and change if required.

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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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