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John Deere X125 Troubleshooting
The
John Deere X125 is a 2WD lawn tractor from X100 series. This model was
manufactured from 2011 to 2017. The driveline consists of 30.6 cu.in (501 cc)
Briggs and Stratton 4-cycle single cylinder OHV vertical shaft air-cooled
gasoline engine with a rated power of 13.4 Hp (10 kW), and belt-driven
hydrostatic transmission with infinite forward and reverse gears.
The John Deere X125 is equipped with a manual steering system, electric
PTO clutch, disc brakes, 15x6.00-6 front tires, and 20x8.00-8 rear
tires. The operating weight is 451 lbs (205 kg). The John Deere X125
tractor is compatible with a 42" mid-mount 2-blade mower deck with a
cutting height of 1.0-4.0" (25-102 mm) and mechanical lift system.
| Engine Troubleshooting |
| Engine doesn't start or difficult to start |
| Fuel tank is empty - Fill fuel up |
| Low-quality gasoline - Change gasoline |
| Dirty fuel lines - Inspect and clean |
| Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change |
| Faulty spark plug - Spark plug need to be replaced |
| Clogged fuel filter - Change fuel filter |
| Brake pedal not depressed - Press the brake pedal |
| Carburetor is dirty - Wash, clean and adjust |
| Low cylinder compression - Check cylinder block and replace worn parts |
| Unadjusted or worn throttle cable - Adjust correctly or replace the cable |
| Air intake grill is clogged - Need to clean or wash |
| Ignition system failure - Check ignition and replace faulty components |
| Throttle cable is stuck or defective - Replace or service the cable |
| Plugged air filter - Service or change air filter |
| Fuel pump is clogged or faulty - Service or change fuel pump |
| Engine starts and then shuts off |
| Defective spark plug - Spark plug need to be replaced |
| Carburetor is dirty or faulty - Clean or replace carburetor |
| Ignition coil is defective - Install a new ignition coil |
| Valve springs are damaged or weak - Change valve springs |
| Valves are stuck - Clean the valves |
| Engine oil level low - Add oil to the engine crankcase |
| Engine overload - Reduce load |
| Air intake grill is clogged - Clean and wash as required |
| Carburetor fuel mixture is too lean - Adjust carburetor properly |
| Wrong ignition timing - Adjust ignition timing correctly |
| Wrong valve setting - Valves needs to be set correctly |
| Stale fuel - Use correct fuel |
| Excessive engine load - Reduce the load |
| Insufficient engine oil - Add oil to the engine crankcase |
| Incorrect low idle setting - Correct the settings |
| Dirty or faulty fuel pump - Service or change fuel pump |
| Main bearings or crankshaft failure - Worn parts replacement required |
| Improper valve clearance - Adjust to proper valve clearance |
| Worn piston rings or cylinder bore - Change faulty parts |
| Carburetor is incorrectly adjusted or clogged - Service or correctly adjust carburetor |
| Air filter element is plugged - Replace or clean air filter |
| Clogged or damaged fuel pump - Check fuel pump and change if required |
| Ignition system malfunction - Check ignition and replace faulty components |
| Damaged cylinder-head gasket - Replace cylinder head gasket |
| Burned or stuck valves - Clean or change valves |
| Worn or bent push rod - Push rod needs to be changed |
| Cylinder block parts are worn out - Replace defective parts as required |
| Throttle did not open fully - Replace or adjust throttle cable |
| Carburetor main jet adjustment is incorrect - Adjust main jet as required |
| Loose or faulty spark plug - Tighten or change the spark plug |
| Valves are worn, burned or stuck - Change or service valves |
| Rings, sleeve, or piston are damaged - Change defective parts |
| Valve clearance is not correct - Adjust to proper valve clearance |
| Gaskets or seals are excessively worn - Replace worn parts to avoid leaks |
| Damaged valve stems or valve guides - Change the valves |
| Worn or broken piston rings - Have piston rings replaced |
| Damaged piston or cylinder liner - Check piston and liner, install new parts as required |
| Plugged breather pipe or hose - Replace or clean |
| Hydrostatic Transmission Troubleshooting |
| HST transmission is making noise |
| Bent or unadjusted speed control pedal linkage - Repair or adjust linkage |
| Transmission overloaded - Reduce transmission load |
| Dirty transmission fluid or insufficient fluid level - Fill to required level or change the fluid |
| Worn or defective transmission components - After disassembling and inspection, change defective components |
| Shift linkage is damaged or loose - Replace or service the linkage |
| Hydrostatic pump is worn or stuck - Repair or change pump |
| Worn or misadjusted transmission shift control parts - Adjust properly or change |
| Lack of transmission fluid - Fill the transmission housing to proper fluid level |
| Worn or defective drive pulley - Install a new pulley |
| Broken or not adjusted shift linkage - Adjust properly or change linkage |
| Speed control pedal linkage is damaged or out of adjustment - Adjust or install new linkage |
| Damaged transmission seals or gaskets - Change seals or gaskets |
| Final drive shaft leaks - Change shaft seals |
| Cracked transmission housing - Housing needs to be replaced |
| Mower Deck Troubleshooting |
| Mower vibrates too much |
| Worn or dirty mower drive pulley - Clean or replace pulley |
| Drive belt is damaged or loose - Adjust belt tension or replace belt |
| Not balanced or bent mower blades - Change or balance blades |
| Loose blade bolts tightening - Bolts should be tightened |
| Discharge chute is constantly plugged |
| Ground speed is too fast - Need to slow down |
| Grass is too high - Adjust mower to lower cutting height |
| Reduced engine speeds - Adjust throttle to full opening |
| Cutting height is too low - Change cutting height adjustment |
| Mower deck drive belt installed incorrectly - Install drive belt as required |
| Cutting deck is clogged - Clean mower deck as required |
| Not sharp blades - Need a blade sharpening |
| Damaged or worn blades - Blades need to be replaced |
| Fast mowing speed - Select a slower speed |
| Cutting level is too low - Use correct cutting height |
| Bagger is overfilled - Empty the bagger |
| Blades are scalping the grass |
| Bumpy or unleveled lawn - Lawn leveling required |
| Mower deck set to low cutting - Raise the cutting height |
| Mowing speed is too high - Use a lower speed |
| Incorrectly leveled mower deck - Adjust mower deck level properly |
| Bent or worn blades - Change the blades |
| Low tire pressure - Correct tire pressure |
| Tires are not properly inflated - Correct tire pressure |
| Incorrectly leveled mower deck - Level the deck correctly |
| Blades are excessively dull - Blades need to be sharpened |
| Worn or defective blades - Blades need to be replaced |
| Clogged mower deck - Need to clean the mower deck |
| Broken mower deck shell - Replace or repair the deck |
| Mower spindle is bent or loose - Repair or change the spindle |
| Electrical Troubleshooting |
| Battery is not charging |
| Loose or corroded wire connections - Service or tighten cable connections |
| Battery terminal connectors are defective - Replace terminal connectors |
| Bad cell in battery - Battery replacement required |
| Low battery capacity - Recharge the battery |
| Battery is not holding charge - Battery needs service or replacement |
| Disconnected battery cables or bad terminals - Check wiring and clean or replace terminals |
| Battery is drained or defective - Charge or replace the battery |
| Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly |
| Battery power is low - Battery is drained, charge it |
| Improperly gapped or dirty spark plug - Clean, gap or replace spark plug |
| Solenoid or starter motor is faulty - Repair starter or replace solenoid |
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| Lawn and Garden Tractors Technical Specs |
