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John Deere X390 Troubleshooting
The
John Deere X390 is a 2-wheel drive lawn tractor from Select X300 series. This
model was manufactured from 2016 to 2025. The John Deere X390 tractor can be
powered by the following engines: Kawasaki FS651V 4-cycle V-twin cylinder OHV
air-cooled gasoline engine with a rated power of 22 Hp (16.4 kW) or Kawasaki
FR691V 4-cycle V-twin cylinder OHV air-cooled gasoline engine with a rated power
of 23 Hp (17.3 kW).
This model is fitted with Tuff Torq hydro transmission with infinite
forward and reverse gears. The John Deere X390 is equipped with a power
steering system, electric PTO clutch, wet disc brakes, 15x6.50-8 front
tires, and 22x11.00-10 rear tires. The operating weight is 534 lbs (242
kg). The tractor is compatible with the following attachments: 48" or
54" mid-mount 3-blade right-discharge mower deck with a cutting height
of 1.0-4.0 in (25-102 mm), 44" front-mount dual-stage snowblower, and
44" front blade.
| Engine Troubleshooting |
| Engine starts up hard or doesn't start |
| Fuel tank is empty - Fill gasoline up |
| Incorrect fuel grade - Use correct gasoline grade |
| Air in fuel tank - Bleed fuel tank |
| Defective spark plug wire connection - Check spark plug wiring connection, repair or change |
| Spark plug is damaged - Spark plug need to be replaced |
| Clogged fuel filter - Fuel filter needs changing |
| Safety contact for brake pedal defective - Install new part |
| Carburetor components worn out - Repair or replace parts |
| Poor compression - Inspect and replace wear parts |
| Choke cable is damaged or not adjusted properly - Change cable or adjust correctly |
| Cooling fins are clogged - Clean and wash as required |
| Defective ignition system - Check ignition and replace faulty components |
| Choke cable is defective or stuck - Replace or service the cable |
| Dirty air filter element - Service or change air filter |
| Fuel pump is damaged or dirty - Service or replace fuel pump |
| Engine starts but immediately shuts off |
| Spark plug is defective - Change spark plug as required |
| Dirty or defective carburetor - Service or change carburetor |
| Defective ignition coil - Install a new ignition coil |
| Loose or worn valve springs - New valve springs need to be installed |
| Valves sticking - Valves must be cleaned |
| Engine oil insufficient - Fill up the engine oil |
| Engine is running overloaded - Reduce the load |
| Clogged cooling fins - Clean and wash as required |
| Carburetor mixture is too lean - Adjust carburetor properly |
| Improper ignition timing - Set the ignition timing correctly |
| Incorrect valve setting - Valves needs to be adjusted properly |
| Low octane gasoline - Change fuel |
| Engine is overloaded - Reduce the load |
| Engine oil level is low - Fill up the oil to required level |
| Low idle speed set incorrectly - Adjust idling as required |
| Fuel pump is dirty or defective - Service or replace fuel pump |
| Crankshaft or main bearings failure - Have bearings or crankshaft replaced |
| Incorrect valve clearance - Adjust valve clearance |
| Cylinder bore or piston rings are damaged - Change faulty parts |
| Carburetor is improperly adjusted or dirty - Adjust the carburetor correctly or clean it |
| Dirty air filter element - Clean or change air filter |
| Fuel pump is damaged or dirty - Clean or install new fuel pump |
| Defective ignition - Inspect ignition system and change failed components |
| Cylinder head gasket is damaged - Install new cylinder head gasket |
| Burned or stuck valves - Replace or clean valves |
| Push rod is damaged or worn - Replace push rod |
| Cylinder block parts are damaged - Defective parts need to be replaced |
| Insufficient throttle opening - Adjust or replace throttle cable |
| Improper adjustment of carburetor main jet - Adjust the carburetor main jet correctly |
| Spark plug is defective or loose - Re-tighten or change the spark plug |
| Valves are stuck, burned, or worn - Change or service valves |
| Rings, sleeve, or piston are damaged - Replace defective parts |
| Valve clearance is incorrect - Adjustment procedure required |
| Gaskets or seals may be damaged - Install new components |
| Worn valve guides and valve stems - Need to replace the valves |
| Seized or wear piston rings - Have piston rings replaced |
| Worn cylinder liner or piston - Inspect liner and piston, replace as necessary |
| Clogged breather pipe or hose - Change or clean |
| Hydrostatic Transmission Troubleshooting |
| HST transmission is excessively noisy |
| Bent or unadjusted speed control pedal linkage - Change or adjust linkage |
| Excessive transmission load - Reduce the load is required |
| Insufficient oil level or contaminated oil - Add oil to the correct level or fill the transmission with fresh oil |
| Worn or defective parts of the hydrostatic transmission - Check internal transmission parts for damage or wear and replace if required |
| Shift linkage is stuck or damaged - Clean or change linkage |
| Hydrostatic pump is defective or blocked - Repair or change pump |
| Transmission shift control components are defective or misadjusted - Adjust correctly or replace |
| Transmission oil level is low - Fill the transmission housing with oil |
| Drive pulley is damaged or worn - Install a new pulley |
| Shift linkage is unadjusted or damaged - Adjust properly or replace linkage |
| Bent or unadjusted speed control pedal linkage - Adjust or install new linkage |
| Transmission seals or gaskets are broken - Change seals or gaskets |
| Final drive shaft leakage - Install new shaft seals |
| Transmission housing is cracked - Install a new transmission housing |
| Mower Deck Troubleshooting |
| Mower vibration is excessive |
| Drive sheave of mower deck is dirty or worn - Replace or clean sheave |
| Loose or defective drive belt - Adjust belt tension or replace belt |
| Mower blades are bent or out of balance - Balance or change as needed |
| Blade bolts are not tightened well - Bolts need to be tightened |
| Discharge chute is regularly plugged |
| Fast ground speed - Use a lower speed |
| Long grass - Need to set low cutting height |
| Engine is running at too low speed - Open throttle fully |
| Low cutting height - Need to set high cutting height |
| Improper drive belt installation - Install drive belt correctly |
| Mower leaving random uncut of grass |
| Cutting deck clogging - Check cutting deck and clean as necessary |
| Excessive blade dullness - Blades need to be sharpened |
| Defective or worn blades - Replace the blades |
| Fast ground speed - Select a lower speed |
| Mower deck set to low cutting - Use correct cutting height |
| Bagger is full - Clean bagger |
| Uneven or bumpy lawn - Lawn leveling required |
| Mower cuts too low - Raise the cutting height |
| Fast mowing speed - Use a lower speed |
| Improperly leveled mower deck - Level the deck correctly |
| Worn or bent blades - Change the blades |
| Tires are not correctly inflated - Need to inflate tires |
| Low tire pressure - Check and inflate the tires |
| Deck level is not correct - Level the deck correctly |
| Blades are not sharp - Need to sharpen the blades |
| Blades are defective or worn - Blades must be changed |
| Clogged mower deck - Need to clean the mower deck |
| Deck shell is broken - Replace or rebuild mower deck |
| Mower spindle is loose or defective - Repair or replace the spindle |
| Electrical Troubleshooting |
| Battery is not charging |
| Corroded or loose cable connections - Tighten or clean electrical wiring connections |
| Defective electrical terminal connectors - Change terminal connectors |
| Defective battery - Use a new battery |
| Low battery voltage - Charge the battery |
| Battery drains quickly - Service charging system or install new battery |
| Disconnected wires or corroded battery terminals - Connect wiring properly or install new terminals |
| Battery is discharged or worn - Recharge or change battery |
| Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required |
| Battery capacity is low - Low battery charging, charge as required |
| Improperly gapped or dirty spark plug - Replace or clean and gap |
| Solenoid or starter motor is faulty - Change solenoid or repair starter |
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| Lawn and Garden Tractors Technical Specs |
