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John Deere S140 Troubleshooting
The
John Deere S140 lawn tractor from S100 Series was manufactured between 2021 and
2025. The John Deere S140 tractor is powered by Briggs and Stratton 44N677
4-cycle V-twin cylinder OHV vertical shaft air-cooled gasoline engine. A 44.2
cubic inches (724 cc) engine has a cylinder bore of 3.12" (79 mm), piston stroke
of 2.89" (73 mm), and rated power of 22 Hp (16.4 kW).
This model is fitted with Tuff Torq TL200 hydrostatic transmission with
infinite forward and reverse gears. The John Deere S140 is equipped with
a manual steering, electric PTO clutch, disc brakes, 15x6.00-6 front
tyres, and 20x8.00-8 rear tyres. The operating weight is 479 lbs (218
kg). Compatible attachments for the tractor: 48" mid-mount 3-blade mower
deck with cutting height of 1.0-4.0" (25-102 mm), 44" front-mount
single-stage snowblower, and 46" front blade.
| Engine Troubleshooting |
| Engine hard starting or not starting |
| No gasoline in tank - Fill fuel up |
| Incorrect fuel grade - Use correct gasoline grade |
| Clogged fuel system - Remove clogging |
| Spark plug wire connection are damaged - Check the spark plug wire connection, repair or replace |
| Defective spark plug - Change spark plug |
| Fuel filter is clogged - Install new filter |
| Defective safety switch - Replace if required |
| Carburetor not adjusted - Adjust according to instructions |
| Low cylinder compression - Check cylinder block and replace worn parts |
| Damaged or incorrectly adjusted choke cable - Replace cable or adjust correctly |
| Clogged cooling fins - Need to wash or clean |
| Ignition system is defective - Check ignition and replace faulty components |
| Choke cable is defective or stuck - Replace or clean the cable |
| Air filter element is plugged - Clean or replace air filter |
| Fuel pump is dirty or defective - Inspect fuel pump and change as required |
| Engine starts but stalls immediately |
| Spark plug is damaged - Spark plug need to be replaced |
| Dirty or faulty carburetor - Repair or clean carburetor |
| Faulty ignition coil - Install a new ignition coil |
| Worn or loose valve springs - Install new valve springs |
| Valves are stuck - Clean the valves |
| Insufficient engine oil - Fill the crankcase with engine oil |
| Excessive engine load - Reduce load |
| Air intake grill is clogged - Need to clean or wash |
| Carburetor mixture is too lean - Adjust carburetor properly |
| Wrong ignition timing - Ignition timing needs to be set properly |
| Improper valve setting - Adjust valves as required |
| Stale fuel - Change fuel |
| Engine is under excessive load - Load reducing required |
| Engine oil level low - Check oil level and add oil as required |
| Too low idle RPM - Correct idle settings |
| Dirty or damaged fuel pump - Service or change fuel pump |
| Crankshaft or main bearings are worn out - Repair or replace defective parts |
| Improper valve clearance - Adjust valve clearance |
| Worn piston rings or cylinder bore - Replace faulty components |
| Engine power is insufficient |
| Carburetor is improperly adjusted or dirty - Carburetor needs to be adjusted correctly or cleaned |
| Air filter element is plugged - Service or change air filter |
| Fuel pump is faulty or clogged - Clean or replace fuel pump |
| Ignition system malfunction - Test ignition and replace failed parts |
| Damaged cylinder-head gasket - Replace the gasket as required |
| Valves are stuck or burned - Replace or clean valves |
| Push rod is worn or defective - Change push rod |
| Worn cylinder block components - Replace defective components |
| Choke opening is not full - Replace or adjust choke cable |
| Carburetor main jet adjustment is improper - Adjust it correctly |
| Spark plug is loose or defective - Tighten or replace spark plug |
| Valves are worn, stuck, or burned - Replace or service valves |
| Worn rings, piston, or sleeve - Replace faulty components as required |
| Valve clearance is wrong - Check and adjust |
| Engine using too much oil |
| Worn seals or gaskets - Worn parts need to be replaced |
| Damaged valve stems or valve guides - Valves must be replaced |
| Piston rings are stuck or broken - Replace piston rings |
| Cylinder liner or piston is worn - Check piston and liner, install new parts as required |
| Plugged breather pipe or hose - Replace or clean |
| Hydrostatic Transmission Troubleshooting |
| HST transmission noise |
| Speed control linkage is defective or unadjusted - Repair or adjust linkage |
| Excessive transmission load - Reduce loading |
| Low transmission oil level or contaminated oil - Add oil to proper level or pour fresh transmission oil |
| Defective or worn transmission parts - Change or repair defective parts |
| Loose or broken shift linkage - Change defective linkage |
| Defective or stuck hydrostatic pump - Change or repair pump |
| Transmission shift control components are defective or misadjusted - Replace or adjust as required |
| Lack of transmission fluid - Fill the transmission housing to proper fluid level |
| Drive sheave is damaged or worn - Install a new sheave |
| Shifting linkage is broken or misadjusted - Adjust properly or change linkage |
| Bent or unadjusted speed control pedal linkage - Change or adjust linkage |
| Broken transmission gaskets or seals - Change gaskets or seals |
| Final drive shaft leakage - Replace shaft seals |
| Cracked transmission case - Replace case or transmission assembly |
| Mower Deck Troubleshooting |
| Mower vibrates too much |
| Dirty or worn mower drive sheave - Replace or clean sheave |
| Loose or damaged drive belt - Install a new belt or adjust belt tension |
| Not balanced or bent mower blades - Balance blades or replace it |
| Loose blade mounting bolts - Tighten bolts as required |
| Constant clogging of discharge chute |
| Mowing speed is too high - Use a lower speed |
| Tall grass - Need to set low cutting height |
| Engine runs at low revs - Choke is not fully opening |
| Low cutting height - Use a higher cutting height |
| Incorrect mower drive belt installation - Install drive belt as required |
| Lawn mower leaving uncut grass |
| Cutting deck clogging - Check cutting deck and clean as necessary |
| Blades are not sharp - Sharpen the blades |
| Defective or worn blades - Replace the blades |
| Ground speed is too fast - Use a lower speed |
| Cutting level is too low - Change cutting height adjustment |
| Grass bag is full - Remove grass from bag |
| Bumpy or not smooth lawn - Roll or level the lawn |
| Mower cuts too low - Use a higher cutting height |
| Mowing speed is too high - Select a lower speed |
| Deck is not leveled correctly - Level the deck properly |
| Blades are bent or worn - Blades must be changed |
| Tires are not properly inflated - Inflate tires as required |
| Tires are not correctly inflated - Correct tire pressure |
| Incorrectly leveled mower deck - Adjust the level of mower deck correctly |
| Blades are excessively dull - Need to sharpen the blades |
| Worn or defective blades - Install new blades |
| Cutting deck is clogged - Inspect and clean cutting deck |
| Broken mower deck housing - Repair or change the deck |
| Loose or faulty mower spindle - Replace or repair the spindle |
| Electrical Troubleshooting |
| Battery does not charge |
| Loose or corroded electrical wiring connections - Tighten or clean connections |
| Battery terminal clamps are faulty - Install new terminal clamps |
| Battery is worn - Battery replacement required |
| Battery voltage is low - Recharge the battery |
| Battery does not hold charge - Service battery or change it |
| Disconnected wires or corroded battery terminals - Connect wires correctly or change terminals |
| Battery is discharged or defective - Need to charge or replace the battery |
| Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly |
| Battery capacity is low - Battery is drained, charge it |
| Spark plug faulty or incorrectly gapped - Replace or clean and gap |
| Starter motor or solenoid failing - Repair starter or install a new solenoid |
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| Lawn and Garden Tractors Technical Specs |
