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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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 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 |
| 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 |
| 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 |
| 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 |
| 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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| Lawn and Garden Tractors Technical Specs |
