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John Deere LA115 Troubleshooting
The
John Deere LA115 lawn tractor was manufactured from 2008 to 2010. The John Deere
LA115 driveline system components: Briggs and Stratton 31P677 4-cycle single
cylinder OHV vertical shaft air-cooled gasoline engine and Tuff Torq T40
belt-driven hydrostatic transmission with infinite forward and reverse gears.
A 30.6 cubic inches (501 cc) engine has a cylinder bore of 3.56" (91
mm), piston stroke of 3.06" (78 mm), and rated power of 19.5 hp (14.5
kW). Max. travel speed (forward/reverse): 5.5 mph (8.8 km/h) and 3.2 mph
(5.1 km/h).
The lawn tractor 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). The John Deere LA115 is compatible with the following
attachments: 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 dual-stage snow
blower with clearing height of 18" (450 mm).
| Engine Troubleshooting |
| Engine doesn't start or difficult to start |
| Empty gas tank - Add fuel |
| Low-quality gasoline - Change fuel |
| Dirt and debris in fuel system - Remove debris and dirt |
| Damaged spark plug wiring connection - Check the spark plug wire connection, repair or replace |
| Spark plug is damaged - Replace spark plug |
| Clogged fuel filter - Change fuel filter |
| Safety contact for brake pedal defective - Install new part |
| Incorrect carburetor adjustment - Adjust carburetor idle mixture screw |
| Low cylinder compression - Check cylinder block and replace worn parts |
| Not adjusted or damaged throttle cable - Change cable or adjust correctly |
| Plugged cooling fins - Need to wash or clean |
| Ignition system failure - Check ignition and replace faulty components |
| Choke cable is stuck or defective - Service or change the cable |
| Air filter element is clogged - Clean or replace air filter |
| Dirty or defective fuel pump - Clean or install new fuel pump |
| Engine starts and stalls suddenly |
| Damaged spark plug - Install new spark plug |
| Dirty or defective carburetor - Carburetor needs to be replaced or cleaned |
| Faulty ignition coil - Ignition coil must be replaced |
| Valve springs are loose or broken - Change valve springs |
| Valves sticking - Valves must be cleaned |
| Engine oil level is insufficient - Fill up the engine oil |
| Engine is under excessive load - Reduce load |
| Cooling fins are clogged - Wash or clean as required |
| Carburetor mixture is too lean - Make the correct settings |
| Incorrect ignition timing - Adjust ignition timing correctly |
| Valve setting is wrong - Adjust valves correctly |
| Stale or low octane fuel - Change fuel |
| Engine overloaded - Load reducing required |
| Engine oil level is low - Check and refill engine oil |
| Low idle speed set incorrectly - Adjustment required |
| Dirty or defective fuel pump - Check fuel pump and replace if necessary |
| Main bearings or crankshaft failure - Need to install new components |
| Valve clearance is incorrect - Adjustment procedure required |
| Damaged cylinder bore or piston rings - Replace defective components |
| Engine power is insufficient |
| Carburetor is improperly adjusted or clogged - Carburetor needs to be adjusted correctly or cleaned |
| Air filter element is clogged - Clean or change air filter |
| Dirty or faulty fuel pump - Inspect fuel pump and change as required |
| Ignition failure - Test ignition and replace failed parts |
| Worn cylinder head gasket - Change cylinder head gasket |
| Stuck or burned valves - Replace or clean valves |
| Bent or worn push rod - Change push rod |
| Worn cylinder block components - Replace defective components |
| Excessive fuel consumption |
| Insufficient choke opening - Inspect choke cable and adjust as required |
| Carburetor main jet is improperly adjusted - Adjust main jet as required |
| Defective or loose spark plug - Re-tighten or change the spark plug |
| Valves are worn, burned or stuck - Change or service valves |
| Rings, sleeve, or piston are damaged - Replace faulty components as required |
| Excessive valve clearance - Adjust valve clearance according to specifications |
| Excessive oil consumption |
| Damaged seals or gaskets - Worn parts need to be replaced |
| Valve stems or guides are damaged - Valves need to be changed |
| Stuck or defective piston rings - Change the piston rings as required |
| Piston or cylinder liner is worn - Inspect piston and liner, replace as required |
| Plugged breather pipe or hose - Change or service |
| Hydrostatic Transmission Troubleshooting |
| HST transmission noise |
| Speed control pedal linkage is bent or not adjusted - Replace or adjust linkage |
| Transmission is under excessive 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 hydrostatic transmission - Change or repair defective parts |
| Corroded or worn shift linkage - Lubricate or change linkage |
| Hydrostatic pump is stuck or worn - Change or repair pump |
| Transmission shift control components are defective or misadjusted - Change or adjust correctly |
| Low oil level - Fill up the transmission oil |
| Worn or defective drive pulley - Replace pulley |
| Unadjusted or broken shift linkage - Adjust properly or change linkage |
| Speed control pedal linkage is bent or not adjusted - Replace or adjust linkage |
| Worn transmission seals or gaskets - Change seals or gaskets |
| Final drive shaft leaks - Replace shaft seals |
| Transmission case is cracked - Replace defective case or transmission assembly |
| Mower Deck Troubleshooting |
| Mower vibrates excessively |
| Clogged or damaged mower drive sheave - Change or clean sheave |
| Loose or damaged drive belt - Adjust belt tension or install a new belt |
| Mower blades are unbalanced or bent - Balance or change as needed |
| Loose blade mounting bolts - Tighten it fast |
| Constant clogging of discharge chute |
| High ground speed - Operate at slower speed |
| Tall grass - Must be set to low cutting height |
| Low engine speeds - Open throttle fully |
| Cutting level is too low - Change cutting height adjustment |
| Mower drive belt installation is improper - Install drive belt correctly |
| Grass patches are not cut |
| Mower deck is clogged - Inspect and clean cutting deck |
| Blades are excessively dull - Need to sharpen the blades |
| Damaged or worn blades - Blades need to be replaced |
| Mowing speed is too high - Select a slower speed |
| Cutting height is too low - Change cutting height adjustment |
| Bagger is overfilled - Clean bagger |
| Bumpy or not smooth lawn - Lawn needs to be leveled |
| Mower deck set to low cutting - Use correct cutting height |
| High mowing speed - Operate at slower speed |
| Deck is not leveled correctly - Adjust mower deck level properly |
| Blades are bent or worn - Blades need to be replaced |
| Tires are not properly inflated - Need to inflate tires |
| Tires are not correctly inflated - Need to inflate tires |
| Incorrect level of mower deck - Adjust mower deck level properly |
| Blades are not sharp - Need a blade sharpening |
| Damaged or worn blades - Blades must be changed |
| Clogged mower deck - Check cutting deck and clean as necessary |
| Deck shell is broken - Repair or change the deck |
| Mower spindle is bent or loose - Spindle needs to be repaired or replaced |
| Electrical Troubleshooting |
| Battery is not charging |
| Electrical wire connections are corroded or loose Tighten or clean connections |
| Battery terminal clamps are faulty - Replace terminal clamps |
| Worn-out battery - Battery replacement required |
| Low battery voltage - Battery is drained, charge it |
| Battery is not holding charge - Service battery or change it |
| Disconnected battery cables or bad terminals - Check cables and clean or change terminals |
| Battery is discharged or worn - Need to charge or replace the battery |
| Battery cables are disconnected or incorrectly connected - Check cables and connect as needed |
| Low battery output - Battery is drained, charge it |
| Spark plug gapped improperly or faulty - Replace or clean and gap |
| Solenoid or starter motor is faulty - Repair starter or replace solenoid |
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| Lawn and Garden Tractors Technical Specs |
