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John Deere LA145 Troubleshooting

The John Deere LA145 is a LA105 series lawn tractor. This model was manufactured from 2008 to 2010. The John Deere LA145 powerline system components: Briggs and Stratton 407777 4-cycle V-twin OHV vertical-shaft air-cooled gasoline engine and Tuff Torq T40 belt-driven hydrostatic transmission with infinite forward and reverse gears.

A 40 cubic inches (656 cc) engine has a cylinder bore of 2.97" (75 mm), piston stroke of 2.89" (73 mm), and rated power of 22 hp (16.4 kW). The maximum forward speed - 5.5 mph (8.8 kph), max. reverse speed - 3.2 mph (5.1 kph). The John Deere LA145 was equipped with a manual steering system, wet disc brakes, 15x6.00-6 front tires, and 20x10.00-8 rear tires. The wheelbase is 49" (1240 mm).

Compatible attachments for the tractor: a 48" mid-mount 3-blade mower deck with cutting height of 1.0-4.0 in (25-102 mm) and manual lift system, 44" front-mount 2-stage snowblower, and 46" front-mount blade with lift height of 6" (150 mm).

Engine Troubleshooting
Engine starts up hard or will not start
No gasoline in tank - Fill gasoline up
Improper fuel grade - Use quality fuel
Fuel system clogged - Repair or replace
Spark plug wire is loose or disconnected - Check the spark plug wire connection, repair or replace
Damaged spark plug - Spark plug need to be replaced
Plugged fuel filter - Fuel filter needs changing
Safety contact for brake pedal defective - Install new part
Carburetor incorrectly set - Set carb correctly
Poor cylinder compression - Check cylinder block and change worn parts
Choke cable is worn or not adjusted properly - Adjust correctly or replace the cable
Engine runs unevenly
Air intake grill is clogged - Need to wash or clean
Ignition system problems - Inspect ignition system and change failed components
Throttle cable is stuck or defective - Replace or service the cable
Dirty air filter element - Replace or service air filter
Fuel pump is defective or dirty - Service or replace fuel pump
Engine starts and immediately shuts off
Spark plug is damaged - Install new spark plug
Faulty or dirty carburetor - Clean or install new carburetor
Faulty ignition coil - Install a new ignition coil
Bad or damaged valve springs - Change valve springs
Stuck valves - Clean the valves
Engine overheats
Insufficient engine oil - Add oil to the engine crankcase
Excessive engine load - Load reducing required
Plugged cooling fins - Wash or clean as required
Carburetor is running lean - Adjust carburetor properly
Bad ignition timing - Ignition timing needs to be adjusted correctly
Valve setting is improper - Valves needs to be adjusted properly
Engine noises or knocks
Stale gasoline - Change fuel
Engine is running overloaded - Reduce engine load
Lack of engine oil - Fill up the oil to required level
Improperly adjusted low idle speed - Need to adjust idle speed
Fuel pump is clogged or faulty - Clean or change fuel pump
Worn crankshaft or main bearings - Change or repair worn components
Incorrect valve clearance - Need to adjust valve clearance
Worn piston rings or cylinder bore - Replace defective parts
Low engine power
Carburetor is dirty or improperly adjusted - Carburetor needs to be adjusted correctly or cleaned
Air filter element is plugged - Replace or clean air filter
Clogged or damaged fuel pump - Service or change fuel pump
Ignition system is defective - Test ignition and replace failed parts
Cylinder head gasket is worn - Cylinder-head gasket replacement required
Burned or stuck valves - Replace or service valves
Push rod is worn or defective - Replace push rod
Faulty cylinder block components - Replace defective parts
High fuel consumption
Insufficient throttle opening - Adjust or replace throttle cable
Improper carburetor main jet adjustment - Adjust main jet as required
Loose or defective spark plug - Tighten or replace spark plug
Valves are worn, burned or stuck - Clean or replace valves
Worn sleeve, rings, or piston - Replace faulty parts
Valve clearance is wrong - Adjust valve clearance according to specifications
Engine using too much oil
Damaged seals or gaskets - New components need to be installed
Worn valve guides and valve stems - Valves replacement required
Piston rings are defective or worn - Piston rings replacement required
Damaged cylinder liner or piston - Check piston and liner, replace as required
Plugged breather pipe or hose - Service or replace

Hydrostatic Transmission Troubleshooting
Excessive HST transmission noise
Speed control pedal linkage is damaged or out of adjustment - Change or adjust linkage
Excessive transmission load - Reduce transmission load
Fluid is contaminated or fluid level is insufficient - Top up to proper level or change transmission fluid
Damaged or worn components of transmission - Check transmission components and change if necessary
Difficult to shift
Loose or broken shift linkage - Change defective linkage
Worn or seized hydrostatic pump - Repair or change pump
Transmission shift control parts are faulty or unadjusted - Replace or adjust as required
Power is insufficient
Transmission oil insufficient - Check transmission oil level and add oil as required
Drive sheave is worn or faulty - Change sheave
Faulty or unadjusted shifting linkage - Change or adjust linkage
Worn or out of adjustment speed control linkage - Replace or adjust linkage
Transmission leakage
Transmission gaskets or seals are damaged - Change seals or gaskets
Final drive shaft leakage - Install new shaft seals
Cracked transmission case - Install a new transmission case

Mower Deck Troubleshooting
Mower vibration is excessive
Damaged or clogged mower drive pulley - Clean or change pulley
Defective or loose drive belt - Install a new belt or adjust belt tension
Bent or unbalanced mower blades - Balance blades or replace it
Blade mounting bolts are loose - Bolts should be tightened
Discharge chute keeps clogging
High ground speed - Select a slower speed
Tall grass - Must be set to low cutting height
Reduced engine rpm - Choke is not fully opening
Low cutting height - Change cutting height adjustment
Incorrect mower drive belt installation - Check drive belt for correct installation
Patches of grass uncut
Deck is plugged with grass - Clean mower deck as required
Blades are excessively dull - Need to sharpen the blades
Worn or damaged blades - Blades must be changed
Fast ground speed - Use a lower speed
Low cutting height - Use correct cutting height
Grass bag is overfilled - Grass bag must be empty
Blade scalped grass
Lawn is not level or bumpy - Lawn needs to be leveled
Mower deck cutting height is set too low - Must be set to high cutting height
Fast mowing speed - Use a slower speed
Deck is not leveled correctly - Level the deck properly
Worn or bent blades - Blades must be changed
Tires are not properly inflated - Need to inflate tires
Mower cutting is uneven
Tires are not properly inflated - Need to inflate tires
Deck is not leveled correctly - Level the deck properly
Blades are excessively dull - Blades need to be sharpened
Worn or bent blades - Change the blades
Cutting deck is clogged - Mower deck needs to be cleaned
Broken mower deck shell - Repair or replace the deck
Loose or defective mower spindle - Spindle needs to be repaired or replaced

Electrical Troubleshooting
Battery will not charge
Wiring connections are corroded or loose - Service or tighten cable connections
Defective battery terminal clamps - Change terminal clamps
Battery faulty cell - Replace the battery
Starter turns slowly
Low battery voltage - Recharge the battery
Battery is draining quickly - Battery needs to be serviced or replaced
Bad terminals or disconnected battery cables - Connect wires properly or change terminals
Starter motor is not working
Battery is drained or defective - Recharge or replace battery
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required
Low battery voltage - Recharge the battery
Spark plug dirty or improperly gapped - Clean and gap or replace
Faulty solenoid or starter motor - Repair starter or change solenoid




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