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John Deere GX335 Tractor Troubleshooting

Gasoline Engine Troubleshooting

John Deere GX335 engine not to start

Empty gas tank - Fill it up.
Wrong grade of gasoline - Use quality gasoline.
Old fuel - Drain gasoline and add fresh.
Fuel system clogged - Repair or replace.
Defective spark plug wires - Inspect and replace if required.
Spark plug not working - Installing new spark plug.
Dirty fuel filter - Install new filter.
Faulty safety switch - Change damaged switch.
Carburetor problems - Carburetor diagnostics required.
Check starter cranking RPM. Compression problems.

Gas engine hard starting

Spark plug failed - Test spark and replace as required.
Carburetor is dirty - Wash, clean and adjust.
Dirt in fuel pipes - Clean fuel system components.
Worn throttle cable - Replace as required.
Stale or incorrect fuel - Drain and add proper fuel.
Electrical connection problems - Inspect and change wires if required.
Failing starter - Test starter and repair if necessary.

Engine runs roughly

Cooling fins blocked - Clean and wash cooling fins.
Loose electrical connections - Check and replace damaged connections.
Ignition setting defective - Test ignition and spark plug.
Choke cable sticks - Repair or change as needed.
Air filter element clogged - Clean or replace the air filter.

JD GX335 Engine runs but misses

Spark plug wear - Change spark plug.
Carburetor malfunction - Inspect and overhaul.
Ignition coil not working - Replace defective component.

Engine overheating

Engine overloaded - Reduce the load.
Air inlet or cooling fins blocked - Clean clogged components.
Engine oil low or too high - Check oil pump for wear or damage.
Incorrect engine oil viscosity - Change engine oil.
Check connecting rod to crankshaft bearing clearance.
Idle speed problems - Adjust carburetor idle mixture screw.

Engine doesn't idle speed

Poor spark plug contact - Check tightness of spark plug.
Spark plug failed - Check the spark and replace defective spark.

John Deere GX335 Engine knocks

Stale fuel - Change gasoline.
Engine overloaded - Reduce the load.
Oil level low - Add engine oil.
Engine speed too low - Adjust carburetor.
Piston rings and cylinder bore worn - Inspect cylinder bore or rings for worn.
Check for engine overheating from plugged cooling fins.
Checking and adjusting valve clearance.
Check for carbon build-up in combustion chamber.

Engine back-fire

Check spark plug for fouled.
Adjust or replace throttle.
Checking and adjusting carburetor.
Checking and adjusting ignition coil air gap.
Check for sticking valves.
Inspect and set valve clearance.
Inspect flywheel key.

Insufficient engine power

Engine temperature too high - Air cleaner element plugged.
High engine oil - Drain excess oil.
Faulty fuel pump - Test fuel pump output.
Governor not work - Inspect and repair governor.
Check carburetor float adjustment.
Test engine compression.

Engine using too much gasoline

Throttle does not open well - Check throttle cable.
Carburetor problems - Adjust carburetor.

Emits black smoke

Air cleaner element clogged - Clean or replace filter.
Choke not fully engaged - Check and repair throttle.
Check oil fill dipstick O-ring seal or cracked cap.

JD GX335 Electrical Troubleshooting

Starter motor will not turn engine

Blown fuse - Installing new fuse.
Battery terminals are corroded - Clean terminals.
Battery discharged - Battery charging required.
Ignition lock is damaged - Install new switch.
Faulty starter - Repair or replace.
Wiring damage - Reconnect wires.

Battery doesn't charge

Dead cell in the battery - Fit new battery.
Bad contact between battery pole and cable - Inspect and Clean.

Lights do not work

Light connector defective.
lamp does not work.
Wiring damaged.

John Deere GX335 Machine Problems

Tractor vibrates too much or rattles excessively

Attachment drive belts worn or damaged - Check and change worn belt.
Traction drive belt damage - Fit new belt.
Dirt on driven pulley - Clean the sheaves.
Unbalancing or bending of blades - Change as needed.

Engine runs but tractor won't move

Parking brake holds the tractor - Unlock park brake.
Bypass valve lever is engaged - Deactivate the bypass valve.
Blades loose - Checking blades for loose bolts.
Poor blade balancing - Check blade balancing.
Low transmission oil - Check transmission oil lever.

JD GX335 Mower Deck Problems

Discharge Chute Clogged

Speed too high - Do not use high speed.
Grass has grown too long - Adjusting cutting height.
Grass too wet - Wait until the grass dries.
Low engine speeds - Adjust carburetor to higher rpm.
Restricted air flow - Adjust to high revs.
Cutting too low - Choose the correct cutting height.
Belt is loose - Reinstall the belt properly.

Lawn mower leaving uncut grass

Clog in discharge area - Check cutting deck and clean if necessary.
Blades dull or damaged - Install new blade.
Deck level is too low - Checking and adjust deck height.
Grass bagger overfilled - Empty bagger.
Speed too high - Need to reduce speed.

Slipping drive belt

Debris in sheaves - Need to clean the pulley.
Belt is worn out - Check and replace belt.
Low belt tension - Install the belt correctly.

John Deere GX335 Mower vibrates

Debris on mower deck or in sheaves - Remove debris from deck or pulley.
Sheaves or belt faulty - Replace worn parts.
Belt or pulleys out of centering - Inspect and centering.
Improper blade balancing - Balance blades correctly.

Blades scalping grass

Cutting height too low - Check and adjust height.
Mower wheel height incorrect - Adjust front or back wheel height.
Low tire pressure - Need to inflate tires.
High blade speed during mowing - Adjust the speed of blades.
Blades are bent - Replace blades.

Uneven Cut

Deck too low - Adjust and level the deck height.
Low tire pressure - Inflate tires as required.
Wheels not positioned correctly - Check rollers adjustment.
Operating at a faster ground speed - Operate the mower at low speed.
Mower blade bent or worn - 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