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John Deere LA125 Troubleshooting
The
John Deere LA125 is a LA105 series lawn tractor. This model was manufactured
between 2008 to 2010. The John Deere LA125 driveline includes a 32.9 cu.in (540
cc) Briggs and Stratton 331877 4-cycle vertical-shaft single cylinder air-cooled
gasoline engine and Tuff Torq T40 Belt-driven hydrostatic transmission with
infinite forward and reverse gears.
The engine has a cylinder bore of 3.7" (94 mm), piston stroke of 3.06"
(78 mm), and rated power of 21 hp (15.3 kW). Max. forward speed - 5.5
mph (8.8 kph), maximum reverse speed - 3.2 mph (5.1 kph).
The John Deere LA125 is equipped with a manual steering system, disc
brakes, 15x6.00-6 front tires, and 20x8.00-8 rear tires. The wheelbase
is 49" (1240 mm). Compatible attachments for the tractor: a 42"
mid-mount 2-blade mower deck with manual lift and cutting height of
1.0-4.0 in (25-102 mm), 46" front-mount blade with lifting height of 6"
(150 mm), and 44" front-mount 2-stage snow blower with clearing height
of 18" (450 mm).
Engine Troubleshooting |
Engine starts up hard or doesn't start |
Gas tank is empty - Fill fuel up |
Low-quality gasoline - Use quality gasoline |
Air or water in fuel system - Remove water or air from fuel system |
Spark plug wire connection are damaged - Check spark plug wiring connection, repair or change |
Spark plug is faulty - Change spark plug as required |
Plugged fuel filter - Change fuel filter |
Brake pedal not pushed down - Push the brake pedal down |
Problems with carburetor adjustment - Adjust as required |
Low engine compression - Inspect cylinder block and change defective components |
Throttle cable is adjusted improperly or worn - Replace cable or adjust properly |
Clogged cooling fins - Need to wash or clean |
Defective ignition system - Check ignition and replace faulty components |
Throttle cable is stuck or faulty - Replace or service the cable |
Air filter is dirty - Service or change air filter |
Clogged or defective fuel pump - Clean or replace fuel pump |
Engine starts and then stalls |
Faulty spark plug - Spark plug need to be replaced |
Carburetor is clogged or faulty - Clean or install new carburetor |
Defective ignition coil - Ignition coil must be replaced |
Broken or bad valve springs - Install new valve springs |
Valves sticking - Valves must be cleaned |
Insufficient engine oil - Add oil to the engine crankcase |
Excessive engine load - Load reducing required |
Air intake grill is clogged - Wash or clean as required |
Too lean carburetor mixture - Set the carburetor correctly |
Ignition timing is improper - Set the ignition timing properly |
Wrong valve setting - Valves needs to be set correctly |
Engine knocking sound or abnormal noise |
Low octane fuel - Use correct fuel |
Engine is overloaded - Load reducing required |
Engine oil level is low - Fill up the engine oil |
Wrong adjustment of low idle speed - Adjust idling as required |
Dirty or faulty fuel pump - Service or replace fuel pump |
Crankshaft or main bearings are worn out - Repair or replace defective parts |
Valve clearance is wrong - Need to adjust valve clearance |
Worn piston rings or cylinder bore - Replace defective parts |
Clogged or incorrectly adjusted carburetor - Adjust the carburetor properly or clean it |
Dirty air filter element - Change or service air filter |
Fuel pump is clogged or faulty - Test fuel pump and replace if necessary |
Ignition system is defective - Inspect ignition system and change faulty parts |
Blown cylinder head gasket - Install new head gasket |
Burned or stuck valves - Replace or service valves |
Push rod is bent or worn - Push rod should be replaced |
Faulty cylinder block parts - Replace defective parts as required |
Engine using too much gasoline |
Choke opening is not full - Replace or adjust choke cable |
Improper carburetor main jet adjustment - Adjust main jet as required |
Spark plug is loose or defective - Tighten or change the spark plug |
Valves are worn, stuck, or burned - Change or service valves |
Worn rings, piston, or sleeve - Change faulty components |
Valve clearance is incorrect - Adjustment procedure required |
Excessive engine oil consumption |
Damaged gaskets or seals - Install new components |
Valve guides and stems are worn - Valves need to be changed |
Piston rings are stuck or worn - Replace piston rings |
Scored cylinder liner or piston - Check liner and piston, change as required |
Clogged breather pipe or hose - Clean or change |
Hydrostatic Transmission Troubleshooting |
Hydrostatic transmission makes excessive noise |
Speed control pedal linkage is bent or not adjusted - Change or adjust linkage |
Excessive transmission load - Reduce loading |
Fluid is contaminated or fluid level is insufficient - Top up to proper level or change transmission fluid |
Transmission parts are worm or defective - Check transmission parts for defects and change if necessary |
Shift linkage is worn or rusty - Replace or lubricate the linkage |
Hydrostatic pump is defective or blocked - Change or repair pump |
Worn or misadjusted transmission shift control parts - Adjust correctly or replace |
Transmission oil level is low - Check and refill the transmission oil |
Faulty or worn drive sheave - Install a new sheave |
Shifting linkage is misadjusted or broken - Adjust properly or replace linkage |
Worn or out of adjustment speed control linkage - Replace or adjust linkage |
Transmission seals or gaskets are broken - Replace seals or gaskets |
Final drive shaft is leaking - Change shaft seals |
Cracked transmission case - Change broken case |
Mower Deck Troubleshooting |
Mower vibrates too much |
Damaged or clogged mower drive pulley - Replace or clean pulley |
Drive belt is defective or loose - Belt needs to be adjusted or replaced |
Unbalanced or warped cutting blades - Replace or balance blades |
Blade mounting bolts are loose - Bolts should be tightened |
Constant clogging of discharge chute |
High ground speed - Use a slower speed |
Grass is too long - Adjust mower to lower cutting height |
Reduced engine rpm - Open throttle fully |
Cutting level is too low - Use a higher cutting height |
Mower drive belt installation is improper - Reinstall drive belt properly |
Lawn mower leaving uncut grass |
Cutting deck clogging - Check cutting deck and clean as necessary |
Blades are excessively dull - Need a blade sharpening |
Worn or damaged blades - Install new blades |
Fast mowing speed - Select a lower speed |
Mower cuts too low - Must be set to high cutting height |
Bagger is full - Remove grass from bagger |
Blades are scalping the grass |
Bumpy or unleveled lawn - Roll or level the lawn |
Cutting level is too low - Raise the cutting height |
High mowing speed - Select a lower speed |
Deck is not leveled correctly - Level the deck properly |
Worn or bent blades - Blades need to be replaced |
Low tire inflation - Check and inflate the tires |
Low tire inflation - Inflate tires correctly |
Improperly leveled mower deck - Level the deck correctly |
Excessive blade dullness - Need a blade sharpening |
Blades are defective or worn - Change the blades |
Deck clogged with grass clippings - Clean out the mower deck |
Damaged mower deck shell - Repair or change the deck |
Mower spindle is loose or defective - Replace or repair the spindle |
Electrical Troubleshooting |
Battery cannot be charged |
Corroded or loose cable connections - Clean or tighten wiring connections |
Battery terminal connectors are faulty - Terminal connectors need to be changed |
Worn-out battery - Change the battery |
Low battery voltage - Battery needs to be recharged |
Battery is not holding charge - Service charging system or replace battery |
Disconnected cables or faulty battery terminals - Check battery wires and service or replace terminals |
Starter motor is not working |
Battery is drained or defective - Recharge or change battery |
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly |
Low battery capacity - Charge the battery |
Spark plug faulty or incorrectly gapped - Replace or clean and gap |
Starter motor or solenoid is defective - Replace solenoid or repair starter |
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Lawn and Garden Tractors Technical Specs |