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John Deere LT150 Troubleshooting
The
John Deere LT150 lawn tractor was manufactured from 2002 to 2005. The John Deere
LT150 tractor is powered by 26.1 cu.in (426 cc) Kohler CV426S vertical shaft
four-cycle 1-cylinder gasoline engine with a rated power of 15 hp (11.2 kW), or
26.1 cu.in (426 cc) Kohler Command CV15S vertical shaft four-cycle single
cylinder gasoline engine with a rated power of 15 hp (11.2 kW).
The John Deere LT150 is fitted with 2 transmission options: Dana 4360
mechanical transmission with 5 forward and 1 reverse gears, or Tuff Torq
K46 hydrostatic transmission with foot-controlled variable speed drive.
The maximum travel speed (forward/reverse): 5.8 mph (9.3 km/h) and 3.5
mph (5.6 km/h). The lawn tractor is equipped with a sector-and-pinion
manual steering, mechanical disc brakes, 15x6.00-6 front tires, and
20x10.00-8 rear tires. The wheelbase is 48" (1210 mm). The John Deere
LT150 is compatible with the following attachments: a 38" mid-mount
2-blade mower deck with cutting height of 1.0-4.0 in (25-102 mm), 13 cut
positions, and manual lift system, and 44" front-mount blade.
| Engine Troubleshooting |
| Engine starts hard or will not start |
| Fuel tank is empty - Add gasoline |
| Wrong fuel grade - Use quality fuel |
| Dirty fuel lines - Inspect and clean |
| Spark plug wiring connection is damaged - Check the spark plug wire connection, repair or replace |
| Spark plug is damaged - Change spark plug as required |
| Clogged fuel filter - Replace fuel filter |
| Brake pedal not pushed down - Push the brake pedal down |
| Carburetor incorrectly set - Set carb correctly |
| Low engine compression - Inspect cylinder block and change defective components |
| Throttle cable is worn or adjusted improperly - Replace cable or adjust properly |
| Air intake grill is clogged - Clean and wash as required |
| Defective ignition - Test ignition and replace failed parts |
| Throttle cable is defective or stuck - Service or change the cable |
| Air filter element is clogged - Replace or service air filter |
| Clogged or defective fuel pump - Test fuel pump and change if necessary |
| Engine starts but stalls suddenly |
| Spark plug is damaged - Spark plug need to be replaced |
| Faulty or clogged carburetor - Clean or replace carburetor |
| Ignition coil is not working - Replace ignition coil as necessary |
| Valve springs are broken or bad - Replace valve springs |
| Stuck valves - Valves must be cleaned |
| Not enough engine oil - Need to add engine oil |
| Engine overload - Reduce load |
| Air intake grill is clogged - Need to clean or wash |
| Carburetor mixture is too lean - Set the carburetor properly |
| Ignition timing is improper - Set the ignition timing correctly |
| Improper valve setting - Set the valves properly |
| Low octane gasoline - Change gasoline |
| Engine overloaded - Reduce load |
| Low engine oil level - Fill the crankcase with engine oil |
| Low idle speed setting is not correct - Need to adjust idle speed |
| Fuel pump is dirty or defective - Clean or install new fuel pump |
| Crankshaft or main bearings failure - Have bearings or crankshaft replaced |
| Valve clearance is wrong - Adjust valve clearance according to specifications |
| Worn piston rings or cylinder bore - Change faulty components |
| Incorrectly adjusted or dirty carburetor - Adjust the carburetor properly or clean it |
| Dirty air filter element - Clean or change air filter |
| Fuel pump is faulty or clogged - Check fuel pump and change if required |
| Ignition system is defective - Inspect ignition system and change failed components |
| Blown cylinder head gasket - Install new cylinder head gasket |
| Burned or stuck valves - Clean or change valves |
| Push rod is damaged or worn - Change push rod |
| Faulty cylinder block components - Replace defective parts as required |
| Choke opening is not full - Replace or adjust choke cable |
| Incorrect carburetor main jet adjustment - Adjust it properly |
| Defective or loose spark plug - Tighten or replace spark plug |
| Stuck, burned, or worn valves - Service or change valves |
| Rings, sleeve, or piston are damaged - Replace faulty parts |
| Valve clearance is wrong - Adjust to proper valve clearance |
| High engine oil consumption |
| Seals or gaskets are wearing excessively - New components need to be installed |
| Worn valve guides and valve stems - Valves need to be changed |
| Piston rings are defective or worn - Have piston rings replaced |
| Scuffed cylinder liner or piston - Inspect piston and liner, replace as required |
| Breather hose or pipe is plugged - Clean or replace |
| Transmission Troubleshooting |
| Gear shift is hard |
| Stuck or damaged gear shift linkage - Replace or repair the shift linkage |
| Damaged or worn shift forks - Shift forks need to be replaced |
| Worn gear shifting mechanism - Repair or change worn components if necessary |
| Transmission is excessively noisy |
| Insufficient transmission oil - Checking transmission oil level and add if necessary |
| Dirty transmission fluid - The fluid must be changed |
| Damaged gears or bearings - Replace defective parts |
| Transmission pops out of gear |
| Bent or improperly installed shift lever - Change or install shift lever properly |
| Worn or damaged gears - Replace defective gears |
| Worn shift forks or shift rods - Change defective forks or rods |
| Worn drive shaft/belt or improper drive shaft/belt adjustment - Install a new shaft/belt or adjust it |
| Faulty clutch/brake or incorrect clutch/brake adjustment - Change clutch/brake or adjust it |
| Drive pulley is worn or faulty - Change pulley |
| Hydrostatic Transmission Troubleshooting |
| HST transmission noise |
| Speed control pedal linkage is bent or not adjusted - Change or adjust linkage |
| Transmission overloaded - Reduce transmission load |
| Oil is dirty or oil level is too low - Add oil to the correct level or fill the transmission with fresh oil |
| Transmission components are damaged or worn - Replace or repair defective components |
| Loose or broken shift linkage - Change defective linkage |
| Hydrostatic pump is seized or faulty - Repair or replace pump |
| Defective or unadjusted transmission shift control components - Adjust properly or change |
| Insufficient transmission fluid - Add fluid to the transmission housing |
| Worn or damaged drive sheave - Install a new sheave |
| Damaged or misadjusted shifter linkage - Replace or adjust linkage |
| Speed control pedal linkage is damaged or out of adjustment - Adjust or repair linkage |
| Transmission gaskets or seals are damaged - Seals and gaskets need to be replaced |
| Final drive shaft leaks - Install new shaft seals |
| Cracked transmission case - Replace case or transmission assembly |
| Mower Deck Troubleshooting |
| Mower vibration is excessive |
| Clogged or damaged mower drive sheave - Service or change sheave |
| Loose or damaged drive belt - Belt needs to be adjusted or replaced |
| Mower blades are not balanced or warped - Balance blades or replace it |
| Blade mounting bolts are loose - Tighten bolts as required |
| Constant clogging of discharge chute |
| Fast ground speed - Use a lower speed |
| Grass is too long - Use a lower cutting height |
| Engine is running at too low speed - Adjust choke to full opening |
| Cutting level is too low - Must be set to high cutting height |
| Incorrect mower drive belt installation - Install drive belt correctly |
| Lawn mower leaving uncut grass |
| Discharge chute is plugged - Clean mower deck as required |
| Blades are not sharp - Need a blade sharpening |
| Blades are defective or worn - Replace the blades |
| Mowing speed is too high - Use a lower speed |
| Low cutting height - Use correct cutting height |
| Bagger is full - Empty the bagger |
| Uneven or bumpy lawn - Lawn leveling required |
| Cutting level is too low - Must be set to high cutting height |
| Fast mowing speed - Operate at slower speed |
| Mower deck is not leveled properly - Deck needs to be adjusted properly |
| Worn or bent blades - Blades need to be replaced |
| Tire pressure is too low - Inflate tires as required |
| Low tire inflation - Inflate tires correctly |
| Deck level is not correct - Adjust mower deck level properly |
| Blades are not sharp - Need to sharpen the blades |
| Worn or defective blades - Replace the blades |
| Deck clogged with grass clippings - Clean mower deck as required |
| Damaged mower deck shell - Rebuild or replace mower deck |
| Mower spindle is loose or defective - Change or repair the spindle |
| Electrical Troubleshooting |
| Battery cannot be charged |
| Electrical cable connections are loose or corroded - Tighten or service connections |
| Battery terminal clamps are faulty - Install new terminal clamps |
| Bad cell in battery - Use a new battery |
| Low battery output - Low battery charging, charge as required |
| Battery does not hold charge - Battery needs service or replacement |
| Faulty battery terminals or disconnected cables - Check wire connections and change or service terminals |
| Battery is discharged or defective - Need to charge or replace the battery |
| Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required |
| Battery capacity is low - Low battery charging, charge as required |
| Spark plug gapped improperly or faulty - Clean, gap or change spark plug |
| Solenoid or starter motor failure - Repair starter or install a new solenoid |
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| Lawn and Garden Tractors Technical Specs |
