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John Deere LT133 Troubleshooting

The John Deere LT133 is a LT-series lawn tractor. This model was manufactured from 1998 to 2001. The John Deere LT133 powertrain system components: Kohler Command CV13S vertical shaft four-cycle single cylinder gasoline engine and Dana 4360 mechanical transmission with 5 forward and 1 reverse gears.

A 24.3 cubic inches (398 cc) engine has a cylinder bore of 3.43" (87 mm), piston stroke of 2.64" (67 mm), and rated power of 13 hp (9.8 kW). Max. forward speed - 5.3 mph (8.5 kph), max. reverse speed - 2.4 mph (3.9 kph).

The John Deere LT133 was equipped with a manual steering system, disc brakes, 15x6.00-6 front tires, and 20x10.00-8 rear tires. The wheel base is 48 in (1210 mm). Compatible attachments for the tractor: a 38" mid-mount 2-blade mower deck with cutting height of 1-4" (25-102 mm), and 42" front blade with manual lift system.

Engine Troubleshooting
Engine starts up hard or won't start
No fuel in fuel tank - Fill it up
Improper fuel grade - Change gasoline
Air in the fuel pipes - Bleed the fuel pipes
Defective spark plug wire connection - Check spark plug wiring connection, repair or change
Spark plug is faulty - Install new spark plug
Fuel filter is plugged - Install new filter
Faulty safety switch - Change damaged switch
Carburetor components worn out - Repair or replace parts
Low cylinder compression - Check cylinder block and replace worn parts
Damaged or incorrectly adjusted choke cable - Adjust correctly or change the cable
Unstable engine running
Cooling fins are plugged - Need to clean or wash
Ignition system malfunction - Check ignition and replace faulty components
Throttle cable is faulty or stuck - Change or service the cable
Air filter element is clogged - Change or service air filter
Dirty or faulty fuel pump - Service or change fuel pump
Engine starts and stalls immediately
Spark plug is damaged - Spark plug need to be replaced
Defective or dirty carburetor - Service or replace carburetor
Ignition coil is damaged - Change ignition coil as required
Valve springs are damaged or weak - Change valve springs
Valves sticking - Service the valves
Engine overheating
Engine oil level is low - Checking oil level and add if necessary
Excessive engine load - Load reducing required
Cooling fins are plugged - Need to wash or clean
Carburetor fuel mixture is too lean - Use proper settings
Incorrect ignition timing - Set the ignition timing properly
Improper valve setting - Valves needs to be set correctly
Abnormal engine knocking or noise
Stale gasoline - Use correct fuel
Excessive engine load - Load reducing is recommended
Insufficient engine oil - Fill the crankcase with engine oil
Incorrectly adjusted low idle speed - Correct the settings
Fuel pump is faulty or clogged - Check fuel pump and change if required
Crankshaft or main bearings wear - Change defective components as required
Incorrect valve clearance - Need to adjust valve clearance
Cylinder bore or piston rings are damaged - Change faulty components
Engine loses power
Clogged or improperly adjusted carburetor - Service or correctly adjust carburetor
Air filter element is clogged - Replace or service air filter
Dirty or faulty fuel pump - Inspect fuel pump and change as required
Ignition system malfunction - Check ignition system and replace faulty parts
Defective cylinder head gasket - Install new cylinder head gasket
Stuck or burned valves - Replace or clean valves
Push rod is bent or worn - Replace push rod
Worn cylinder block components - Replace defective components
Excessive fuel consumption
Choke is not fully open - Check choke cable and adjust it
Carburetor main jet is incorrectly adjusted - Adjust it properly
Defective or loose spark plug - Tighten or change the spark plug
Valves are stuck, burned, or worn - Replace or service valves
Piston, sleeve, or rings are damaged - Change defective components
Valve clearance is improper - Adjust valve clearance
Excessive oil consumption
Gaskets or seals can be faulty - Install new components
Damaged valve guides or valve stems - Replace defective valves
Seized or wear piston rings - Have piston rings replaced
Scored cylinder liner or piston - Inspect liner and piston, change as necessary
Breather hose or pipe is clogged - Replace or service

Transmission Troubleshooting
Difficulty shifting gears
Rusty or worn gear shift linkage - Install a new gear shift linkage
Worn or bent shift forks - Shift forks need to be changed
Worn gear shift mechanism - Replace worn components
Transmission makes excessive noise
Low transmission fluid level - Add fluid to the transmission housing
Oil contamination - Change transmission oil
Damaged bearings or worn gears - Replace faulty parts
Transmission jumping out of gear
Shift lever is bent or installed incorrectly - Replace or install shift lever correctly
Gear teeth are damaged or worn - Install new gears
Faulty shift rods or shift forks - Change damaged rods or forks
Transmission slips
Worn drive shaft/belt or improper drive shaft/belt adjustment - Change belt/shaft or adjust it
Brake/clutch is damaged or improperly adjusted - Adjust clutch/brake or install a new one
Worn or faulty drive pulley - Change pulley

Mower Deck Troubleshooting
Mower vibrates excessively
Worn or dirty mower drive pulley - Change or clean pulley
Loose or defective drive belt - Adjust belt tension or change the belt
Cutting blades are bent or unbalanced - Balance or change as needed
Loose blade mounting bolts - Tighten bolts as required
Constant clogging of discharge chute
Mowing speed is too high - Operate at slower speed
Grass is too high - Adjust mower to lower cutting height
Engine runs at low revs - Throttle is not fully open
Low cutting height - Use a higher cutting height
Mower deck drive belt installed incorrectly - Drive belt must be installed correctly
Mower leaving random uncut of grass
Discharge area is clogged - Clean mower deck as required
Blades are not sharp - Need a blade sharpening
Blades are defective or worn - Blades need to be replaced
High ground speed - Need to slow down
Cutting height is too low - Use correct cutting height
Filled bagger - Clean bagger
Blades are scalping the grass
Uneven or bumpy lawn - Lawn leveling required
Mower deck cutting height is set too low - Use correct cutting height
High ground speed - Operate at slower speed
Deck is not leveled correctly - Adjust mower deck level properly
Bent or worn blades - Replace the blades
Low tire inflation - Correct tire pressure
Mower cuts uneven
Low tire pressure - Correct tire pressure
Improperly leveled mower deck - Adjust the level of mower deck correctly
Blades are not sharp - Blades need to be sharpened
Damaged or worn blades - Blades need to be replaced
Discharge area is clogged - Inspect and clean cutting deck
Deck shell is broken - Replace or rebuild mower deck
Loose or defective mower spindle - Spindle needs to be repaired or replaced

Electrical Troubleshooting
Battery cannot be charged
Loose or corroded wire connections - Service or tighten cable connections
Faulty battery terminal clamps - Terminal clamps need to be replaced
Dead cell in battery - Battery change required
Starter motor turns slow
Low battery voltage - Battery is drained, recharge it
Battery runs out quickly - Service charging system or change battery
Corroded battery terminals or disconnected wires - Check wiring and clean or replace terminals
Starter will not work
Battery is discharged or defective - Recharge or change battery
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required
Low battery voltage - Battery is drained, charge it
Incorrectly gapped or worn spark plug - Clean, gap or replace spark plug
Faulty solenoid or starter motor - Repair starter or replace solenoid




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