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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 |
