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John Deere 335 Tractor Troubleshooting

Gasoline Engine Problems

John Deere 335 Engine not starting

Empty fuel tank - Add gasoline.
Wrong grade of gasoline - Change gasoline.
Stale gasoline - Drain fuel and replace with fresh fuel.
Dirty fuel system - Check and clean.
Spark plug wires are damaged - Check wires connection.
Faulty spark plug - Check ignition spark.
Clogged fuel filter - Fuel filter needs changing.
Defective safety switch - Replace if required.
Carburetor is clogged - Clean the carburetor.
Inspect and adjust choke. Check the Valves and Compression System.

Engine is difficult to start

Spark plug failed - Test spark and change as required.
Carburetor not adjusted - Adjust according to instructions.
Fuel pipes are clogged - Servicing fuel system.
Throttle cable damaged - Change the cable.
Stale or improper fuel - Pour quality gasoline.
Electrical wires are damaged - Check and replace wires if necessary.
Failing starter - Check starter, repair or replace.

Engine runs roughly

Cooling fins plugged - Remove dirt from cooling fins.
Electrical connections damaged - Inspect and restore defective contacts.
Ignition adjustment lost - Check ignition and adjust if necessary.
Throttle cable sticks - Check and repair.
Air filter dirty - Clean or change air filter.

JD 335 Engine misses

Spark plug wear - Check spark plug for fouled condition and proper gap.
Carburetor problems - Test and repair.
Ignition coil defective - Test ignition coil and replace if necessary.

Engine overheating

Engine runs under excessive load - Reduce loads.
Air intake screen clogged - Clean dirty components.
Too much or too little oil - Inspect oil level.
Improper engine oil viscosity - Change engine oil.
Check connecting rod to crankshaft bearing clearance.
Idle speed problems - Adjust fast idle.

Engine does not idle

Poor spark plug contact - Check tightness of spark plug.
Spark plug worn out - Test spark and change as required.

Engine knocking

Low octane gasoline - Use proper fuel.
Excessive engine load - Reduce loads.
Low oil level - Add to required level.
Engine speed too low - Adjust the 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.
Checking for wear crankshaft or camshaft bearings.

John Deere 335 Engine backfires

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

Engine lacks power

Engine overheats - Clogged air filter element.
High engine oil - Excess oil must be drained.
Fuel pump is damage - Test fuel pump output.
Defective governor - Inspect and repair governor.
Check and overhaul carburetor.
Checking engine compression.

Engine gets too much gas

Insufficient choke opening - Adjust choke cable.
Carburetor malfunction - Check carburetor float adjustment.

Black exhaust smoke

Air cleaner element clogged - Clean or replace filter.
Throttle is partially engaged - Inspecting and adjusting choke.
Checking and adjusting carburetor float level.

JD 335 Electrical Troubleshooting

Starter does not function

Main fuse defective - Installing new fuse.
Battery contacts are corroded - Clean terminals.
Low-voltage battery - Battery charging required.
Ignition lock is damaged - Change the lock.
Starter is not working - Replace or repair.
Electrical wires are damaged - Reconnect wires.

Battery does not charge

Battery cells fails - Install new battery.
Battery cables and terminals are dirty - Inspect and Clean.

Lighting does not function

Connection/disconnection level in wrong position.
Loose or burned out bulb.
Inspect electrical wires for short- circuit.

John Deere 335 Machine Troubleshooting

The machine vibrates

Implements drive belts damaged or worn - Belt replacement required.
Worn traction drive belt - Install new belt.
Drive pulley is dirty - Installing a new pulley.
Blades bent or out of balance - Balance the blades or replace.

The engine is running but tractor is not moving

The parking brake is locked - Unlock park brake.
Bypass valve pulled out - Set bypass valve to the off position.
Mower blades are loose - Tighten mower blades.
Blades are unbalanced - Balance the blades correctly.
Low transmission oil - Add oil to the transmission.

John Deere 335 Lawn Mower Problems

Clogged discharge chute

Speed too high - Do not use high speed.
Grass has grown too long - try operating a short cutting height.
Grass too wet - Do not mow when grass is wet.
Engine is running at too low speed - The throttle is not fully open.
Restricted air flow - Adjust to high revs.
Low cutting height - Adjust to higher cutting.
Belt installed improperly - Check belt installation.

Uncut grass during operation

Mower deck clogged - Mower deck needs cleaning.
Excessive blade wear - Sharpen the blade or install a new one.
Mower deck low - Adjust and level the deck height.
Grass bagger overfilled - Clean bagger.
Speed is very high - Do not use high speed.

Belt Slipping

Sheave is dirty - Recommend cleaning the sheaves.
Worn belt - Inspect and replace worn belt.
Belt tension is incorrect - Check and adjusting belt tension.

Too much mower vibration

Debris in pulleys or in mower deck - Clean sheave and deck from clogging.
Damaged pulleys or belt - Change worn parts.
Pulleys or belt misaligned - Check and align.
Improper blade balancing - Adjust blade balance.

Blades scalp grass

Incorrect height cutting - Check and adjust height.
Mower wheels not adjusted correctly - Adjust mower deck wheels.
Insufficient tire pressure - Increase tire pressure.
Higher blade speed - Correct blades speed.
Bent blades during operation - Remove bent blade and fit new one.

Uneven cutting results

Deck too low - Checking and adjust deck height.
Insufficient tire pressure - Tire pressure required.
Incorrect wheel height - Check wheel adjustment.
Operating at a faster ground speed - Use slower speed.
Mower blade worn or bent - Sharpen the blade or install a new one.

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