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John Deere GT235 Troubleshooting

The John Deere GT235 is a GT200 series garden tractor. This model was manufactured from 1999 to 2005.

The John Deere GT235 powerline components: Kawasaki FH580V vertical V-twin cylinder air cooled gasoline engine or Briggs and Stratton 350777 Vanguard vertical shaft V-twin cylinder air-cooled gasoline engine, and Tuff Torq K71 belt-driven hydrostatic transmission. The Kawasaki engine has a cylinder bore of 2.92" (74 mm), piston stroke of 2.69" (68 mm), and rated power of 17 hp (12.7 kW).

The Briggs engine has a cylinder bore of 2.83" (72 mm), piston stroke of 2.75" (70 mm), and rated power of 18 hp (13.3 kW). The maximum forward speed - 7 mph (11.3 kph), max. reverse speed - 4 mph (6.4 kph). The tractor is equipped with 16x6.50-8 front tires and 23x10.50-12 rear tires. The wheelbase is 49" (1240 mm).

Compatible attachments for John Deere GT235: a 48" mid-mount 3-blade mower deck with cutting height of 1-4" (25-102 mm) and electric blade engagement, 42" front-mount single-stage snowblower with clearing height of 16" (405 mm), 46" front blade with mechanical lifting system, and 30" rear-mount mechanical tiller.

Engine Troubleshooting
Engine won't start or starts hard
Empty fuel tank - Fill it up
Wrong grade of gasoline - Change fuel
Air in fuel system - Bleed fuel system
Spark plug wire connection are damaged - Inspect spark plug wiring connection, change or repair
Defective spark plug - Install new spark plug
Fuel filter is clogged - Fuel filter needs changing
Safety contact for brake pedal defective - Install new part
Problems with carburetor adjustment - Adjust as required
Engine has low compression - Check cylinder block and replace defective parts
Choke cable is unadjusted or damaged - Change cable or adjust correctly
Engine runs intermittently
Air intake screen is plugged - Wash or clean as required
Ignition system problems - Inspect ignition system and change failed components
Choke cable is defective or stuck - Change or clean the cable
Plugged air filter - Service or replace air filter
Fuel pump is faulty or clogged - Check fuel pump and replace if necessary
Engine starts but immediately shuts off
Spark plug is defective - Install new spark plug
Carburetor is dirty or faulty - Replace or service carburetor
Ignition coil is damaged - Ignition coil must be replaced
Valve springs are damaged or weak - Replace valve springs
Valves sticking - Clean the valves
Engine overheated
Not enough engine oil - Fill the crankcase with engine oil
Engine overloaded - Reduce engine load
Clogged cooling fins - Need to wash or clean
Carburetor fuel mixture is too lean - Adjust carburetor properly
Incorrect ignition timing - Ignition timing needs to be set properly
Wrong valve setting - Set the valves properly
Abnormal engine knocking or noise
Stale gasoline - Use correct gasoline
Engine overload - Load reducing is recommended
Engine oil level is low - Fill the crankcase with engine oil
Incorrect low idle setting - Correct idle adjustment
Fuel pump is faulty or clogged - Service or change fuel pump
Main bearings or crankshaft wear - Install new parts as as required
Valve clearance is wrong - Check and adjust
Damaged cylinder bore or piston rings - Change defective parts
Loss of engine power
Carburetor is improperly adjusted or dirty - Adjust carburetor properly or service it
Air filter is dirty - Clean or replace air filter
Fuel pump is clogged or faulty - Check fuel pump and change if required
Defective ignition system - Test ignition and replace failed parts
Worn cylinder head gasket - Cylinder-head gasket replacement required
Valves are burned or stuck - Clean or change valves
Worn or damaged push rod - Replace push rod
Cylinder block components are worn - Change defective components
Excessive fuel consumption
Throttle did not open fully - Replace or adjust throttle cable
Carburetor main jet is improperly adjusted - Adjust the carburetor main jet correctly
Loose or faulty spark plug - Tighten or replace spark plug
Valves are stuck, worn, or burned - Service or replace valves
Sleeve, piston, or rings are damaged - Change defective components
Valve clearance is incorrect - Adjust to proper valve clearance
Engine consuming too much oil
Gaskets or seals can be faulty - Replace defective parts
Valve stems and guides are worn - Valves replacement required
Piston rings are stuck or broken - Have piston rings replaced
Cylinder liner or piston is scuffed - Check liner and piston, install new components as required
Breather pipe or hose is clogged - Clean or change

Hydrostatic Transmission Troubleshooting
HST transmission is making noise
Worn or out of adjustment speed control linkage - Adjust or install new linkage
Excessive transmission load - The load should be reduced
Oil is dirty or oil level is too low - Fill to required level or change the transmission oil
Worn or defective parts of transmission - Check internal transmission parts and replace if required
Shifting is hard
Damaged or loose shift linkage - Change or repair linkage
Seized or worn hydrostatic pump - Replace or repair pump
Defective or unadjusted transmission shift control components - Adjust properly or change
Loss of power
Insufficient transmission fluid - Need to add transmission fluid
Drive pulley is damaged or worn - Replace pulley
Unadjusted or broken shift linkage - Change or adjust linkage
Worn or out of adjustment speed control linkage - Replace or adjust linkage
Transmission leaking
Damaged transmission seals or gaskets - Install new gaskets or seals
Leaking final drive shaft - Change shaft seals
Transmission case is cracked - Change broken case

Mower Deck Troubleshooting
Mower vibration is excessive
Drive pulley of mower deck is damaged or dirty - Clean or replace pulley
Drive belt is damaged or loose - Change belt or adjust belt tension
Warped or not balanced mower blades - Balance or replace blades
Blade mounting bolts are loose - Bolts should be tightened
Discharge chute keeps clogging
Fast mowing speed - Select a slower speed
Long grass - Must be set to low cutting height
Low engine speeds - Throttle is not fully open
Cutting level is too low - Change cutting height adjustment
Incorrect mower drive belt installation - Drive belt must be installed correctly
Lawn mower leaving uncut grass
Deck is plugged with grass - Check cutting deck and clean as necessary
Excessive blade dullness - Blades need to be sharpened
Defective or worn blades - Blades must be changed
Fast mowing speed - Operate at slower speed
Mower cuts too low - Need to set high cutting height
Grass bag is full - Empty the grass bag
Blade scalped grass
Lawn is uneven or bumpy - Roll or level the lawn
Mower deck cutting height is set too low - Change cutting height adjustment
High ground speed - Need to slow down
Mower deck is not leveled properly - Deck needs to be adjusted properly
Bent or worn blades - Install new blades
Tires are not properly inflated - Correct tire pressure
Uneven cutting
Tire pressure is too low - Need to inflate tires
Deck is not leveled correctly - Level the deck properly
Blades are too dull - Need to sharpen the blades
Blades are worn or damaged - Install new blades
Clogged mower deck - Mower deck needs to be cleaned
Damaged mower deck shell - Rebuild or replace mower deck
Loose or faulty mower spindle - Spindle needs to be repaired or replaced

Electrical Troubleshooting
Battery cannot be charged
Corroded or loose wire connections - Clean or tighten connections
Defective battery terminal connectors - Terminal connectors should be replaced
Battery is defective - Battery replacement required
Starter cranks slow
Low battery output voltage - Battery is drained, charge it
Battery is not holding charge - Service charging system or replace battery
Faulty battery terminals or disconnected cables - Connect wiring correctly or install new terminals
Starter is not working
Battery is discharged or worn - Need to charge or replace the battery
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly
Low battery output - Recharge the battery
Improperly gapped or dirty spark plug - Replace or clean and gap
Starter motor or solenoid is defective - Starter/solenoid should be replaced




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