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John Deere GX345 Troubleshooting

The John Deere GX345 is a garden tractor from GX300 series. This model was manufactured between 2002 and 2005. The components of John Deere GX345 driveline system: Kawasaki FD611V 4-stroke V-twin cylinder vertical shaft OVH liquid cooled gasoline engine and Tuff Torq K71 belt-driven hydrostatic transmission with infinite forward and reverse gears.

A 37.7 cubic inches (617 cc) engine has a cylinder bore of 2.91" (74 mm), piston stroke of 2.68" (68 mm), and rated power of 20 hp (14.9 kW). The maximum forward speed - 7 mph (11.3 kph), maximum reverse speed - 4 mph (6.4 kph).

The garden tractor is equipped with a power steering system, internal wet disc brakes, 16x6.50-8 front tires, and 24x12.00-12 rear tires. The wheel base is 49.3" (1250 mm). The John Deere GX345 is compatible with 48" or 54" mid-mount 3-blade mower decks with cutting height of 1.0-4.0" (25-102 mm), 13 cut positions, and manual lift system, or 48" front-mount blade.

Engine Troubleshooting
Engine doesn't start or hard to start
Gas tank is empty - Add fuel
Improper fuel grade - Change fuel
Dirt and debris in fuel system - Remove debris and dirt
Spark plug wire is disconnected or loose - Check spark plug wiring connection, repair or change
Defective spark plug - Change spark plug
Plugged fuel filter - Fuel filter needs changing
Brake pedal not depressed - Press the brake pedal
Carburetor is not adjusted - Check carburetor float adjustment
Weak cylinder compression - Inspect cylinder block and change worn parts
Throttle cable is adjusted improperly or worn - Replace cable or adjust correctly
Irregular engine running
Cooling fins are plugged - Need to wash or clean
Ignition system problems - Inspect ignition system and change failed components
Choke cable is faulty or stuck - Service or change the cable
Dirty air filter element - Service or replace air filter
Fuel pump is dirty or defective - Service or replace fuel pump
Engine starts and stops suddenly
Spark plug is damaged - Replace spark plug
Carburetor is dirty or faulty - Service or change carburetor
Ignition coil is defective - Change ignition coil as required
Broken or loose valve springs - Replace valve springs
Valves sticking - Valves need to be cleaned
Engine overheating
Engine oil level is insufficient - Fill up the engine oil
Engine overload - Load reducing required
Plugged cooling fins - Clean and wash as required
Too lean carburetor mixture - Set the carburetor properly
Incorrect ignition timing - Adjust ignition timing as required
Valve setting is wrong - Valves needs to be set correctly
Engine knocking or noise
Low octane gasoline - Change gasoline
Engine is running overloaded - Reduce the load
Lack of engine oil - Check and refill engine oil
Low idle speed adjustment is incorrect - Correct the settings
Dirty or faulty fuel pump - Test fuel pump and replace if necessary
Worn crankshaft or main bearings - Replace crankshaft or bearings
Valve clearance is not correct - Check and adjust
Piston rings or cylinder bore are worn - Replace defective parts
Engine power is insufficient
Carburetor is clogged or incorrectly adjusted - Service or correctly adjust carburetor
Clogged air filter - Clean or replace air filter
Fuel pump is dirty or defective - Clean or install new fuel pump
Ignition system malfunction - Inspect ignition system and change failed components
Cylinder head gasket is damaged - Replace the gasket as required
Valves are burned or stuck - Clean or replace valves
Push rod is bent or worn - Install a new push rod
Cylinder block components are worn - Change defective parts
Engine using too much gasoline
Throttle not fully open - Check throttle cable and adjust as required
Carburetor main jet is improperly adjusted - Adjust it correctly
Defective or loose spark plug - Tighten or replace spark plug
Valves are worn, stuck, or burned - Change or clean valves
Rings, sleeve, or piston are damaged - Change defective parts
Improper valve clearance - Need to adjust valve clearance
Excessive engine oil consumption
Seals or gaskets are defective - Worn parts need to be replaced
Valve stems or guides are damaged - Replace the valves
Damaged or seized piston rings - Change the piston rings as required
Cylinder liner or piston is damaged - Check piston and liner, change as required
Breather pipe or hose is blocked - Clean or change

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission makes excessive noise
Speed control linkage is defective or unadjusted - Replace or adjust linkage
Excessive transmission load - Load needs to be reduced
Insufficient oil level or contaminated oil - Change transmission oil or top up to proper level
Transmission parts are worm or defective - Replace or repair defective components
Shifting is hard
Loose or broken shift linkage - Change defective linkage
Seized or worn hydrostatic pump - Replace or repair pump
Faulty or misadjusted transmission shift control parts - Adjust properly or change
Low power
Low oil level - Fill the transmission housing to proper oil level
Drive pulley is defective or worn - Change pulley
Unadjusted or broken shift linkage - Adjust correctly or replace linkage
Speed control linkage is defective or unadjusted - Repair or adjust linkage
Transmission leakage
Transmission seals or gaskets are broken - Install new seals or gaskets
Leaking final drive shaft - Install new shaft seals
Cracked transmission case - Install a new transmission case

Mower Deck Troubleshooting
Mower vibrates too much
Drive pulley of mower deck is damaged or dirty - Replace or service pulley
Loose or defective drive belt - Belt needs to be adjusted or replaced
Mower blades are bent or out of balance - Balance or change as needed
Blade mounting bolts are loose - Bolts should be tightened
Discharge chute keeps clogging
High mowing speed - Operate at slower speed
Tall grass - Adjust mower to lower cutting height
Reduced engine rpm - Throttle is not fully open
Cutting level is too low - Need to set high cutting height
Mower drive belt installation is improper - Install drive belt correctly
Patches of grass uncut
Clogged mower deck - Clean mower deck as required
Blades are too dull - Sharpen the blades
Worn or defective blades - Blades must be changed
Fast ground speed - Operate at slower speed
Low cutting height - Change cutting height adjustment
Full bagger - Empty the bagger
Blade scalped grass
Lawn is bumpy or not smooth - Roll or level the lawn
Mower deck set to low cutting - Adjust mower to higher cutting height
High mowing speed - Select a lower speed
Improperly leveled mower deck - Adjust mower deck level properly
Worn or bent blades - Change the blades
Tires are not correctly inflated - Need to inflate tires
Mower cuts uneven
Tires are not properly inflated - Need to inflate tires
Deck level is not correct - Level the deck properly
Not sharp blades - Need to sharpen the blades
Blades are defective or worn - Blades must be changed
Discharge area is clogged - Check cutting deck and clean as necessary
Deck shell is broken - Replace or rebuild mower deck
Loose or faulty mower spindle - Repair or replace the spindle

Electrical Troubleshooting
Battery is not charging
Wiring connections are loose or corroded - Service or tighten connections
Battery terminal clamps are faulty - Change terminal clamps
Worn-out battery - Install a new battery
Starter turns slow
Battery power is low - Low battery charging, charge as required
Battery is draining quickly - Service charging system or replace battery
Battery cables are disconnected or terminals are faulty - Check cable connections and change or clean terminals
Starter motor is not working
Battery is low or faulty - Charge or replace the battery
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required
Low battery power - Recharge the battery
Spark plug gapped improperly or faulty - Clean and gap or replace
Faulty solenoid or starter motor - Repair starter or change solenoid




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