________________________________________________________________________________________
John Deere STX46 Troubleshooting
The
John Deere STX46 lawn tractor was manufactured between 1995 and 1997. The John
Deere STX46 tractor is powered by Kohler Command LT CV15S 4-cycle single
cylinder OHV vertical shaft air-cooled gasoline engine. A 26 cubic inches (426
cc) engine has a cylinder bore of 3.61" (90 mm), piston stroke of 2.64" (67 mm),
and rated power of 15 Hp (11.2 kW).
This model is fitted with several transmission options: 5x1 belt-driven
gear transmission or 1-range hydrostatic transmission. The John Deere
STX46 is equipped with a manual steering system, electric PTO clutch,
external disc brakes, 15x6.50-6 front tyres, and 20x8.00-8 rear tyres.
The operating weight is 450 lbs (204 kg). The tractor is compatible with
a 46" mid-mount 3-blade mower deck with cutting height of 1.8-3.5"
(25-90 mm).
| Engine Troubleshooting |
| Engine won't start or hard to start |
| No gasoline in tank - Fill gasoline up |
| Improper fuel grade - Change fuel |
| There is air in the fuel system - Bleed the system |
| Defective spark plug wire connection - Check spark plug wiring connection, repair or change |
| Damaged spark plug - Install new spark plug |
| Dirty fuel filter - Fuel filter needs changing |
| Safety contact for brake pedal defective - Install new part |
| Carburetor is not working properly - Inspect and adjust |
| Engine has low compression - Check cylinder block and replace defective parts |
| Choke cable is damaged or not adjusted properly - Change cable or adjust properly |
| Cooling fins are clogged - Need to wash or clean |
| Ignition failure - Check ignition system and replace faulty parts |
| Defective or stuck throttle cable - Clean or replace the cable |
| Air filter element is clogged - Replace or clean air filter |
| Dirty or defective fuel pump - Clean or replace fuel pump |
| Engine starts and stalls suddenly |
| Defective spark plug - Change spark plug |
| Clogged or faulty carburetor - Repair or clean carburetor |
| Ignition coil is not working - Install a new ignition coil |
| Loose or worn valve springs - Change valve springs |
| Valves are stuck - Valves need to be cleaned |
| Lack of engine oil - Fill the crankcase with engine oil |
| Engine is running overloaded - Load reducing is recommended |
| Cooling fins are plugged - Wash or clean as required |
| Too lean carburetor mixture - Adjust carburetor properly |
| Incorrect ignition timing - Adjust ignition timing correctly |
| Improper valve setting - Valves needs to be set correctly |
| Low octane gasoline - Change gasoline |
| Engine overload - Reduce the load |
| Engine oil level is low - Check and refill engine oil |
| Wrong adjustment of low idle speed - Adjust the low idle speed |
| Clogged or damaged fuel pump - Test fuel pump and change if necessary |
| Crankshaft or main bearings wear - Have bearings or crankshaft replaced |
| Valve clearance is not correct - Adjustment procedure required |
| Worn cylinder bore or piston rings - Change defective parts |
| Carburetor is improperly adjusted or clogged - Service or properly adjust carburetor |
| Air filter is dirty - Clean or change air filter |
| Fuel pump is defective or dirty - Clean or change fuel pump |
| Ignition system failure - Test ignition and replace failed parts |
| Blown cylinder head gasket - Install new head gasket |
| Burned or stuck valves - Clean or replace valves |
| Push rod is bent or worn - Install a new push rod |
| Cylinder block parts are worn out - Change defective components |
| Engine using too much gasoline |
| Choke didn't open fully - Adjust or change choke cable |
| Incorrect carburetor main jet adjustment - Adjust the carburetor main jet properly |
| Spark plug is loose or faulty - Replace or tighten spark plug |
| Stuck, worn, or burned valves - Replace or service valves |
| Worn sleeve, rings, or piston - Replace faulty components as required |
| Valve clearance is incorrect - Adjust valve clearance according to specifications |
| Engine oil consumption is too high |
| Worn gaskets or seals - Replace defective parts |
| Valve stems or guides are damaged - Change the valves |
| Stuck or defective piston rings - Have piston rings replaced |
| Piston or cylinder liner is worn - Inspect liner and piston, change as necessary |
| Breather pipe or hose is clogged - Replace or service |
| Transmission Troubleshooting |
| Difficult to shift gears |
| Gear shift linkage is damaged or loose - Replace or service the shift linkage |
| Shift forks are damaged or worn - Shift forks need to be replaced |
| Faulty gear shifting mechanism - Faulty parts must be changed |
| Transmission is making noise |
| Transmission oil insufficient - Fill up the transmission oil |
| Transmission oil is dirty - Transmission oil change required |
| Damaged bearings or worn gears - Replace faulty parts |
| Transmission jumps out of gear |
| Damaged or improperly installed shifting lever - Change or install shift lever properly |
| Damaged or worn gears - Replace defective gears |
| Shift forks or shift rods are worn - Change damaged forks or rods |
| Improper drive shaft/belt adjustment or damaged drive shaft/belt - Adjust or change belt/shaft |
| Brake/clutch is improperly adjusted or damaged - Adjust clutch/brake or install a new one |
| Drive pulley is defective or worn - Install a new pulley |
| Hydrostatic Transmission Troubleshooting |
| Hydrostatic transmission makes excessive noise |
| Speed control linkage is defective or unadjusted - Adjust or replace linkage |
| Transmission overloaded - Reduce transmission load |
| Low transmission oil level or contaminated oil - Add oil to the correct level or fill the transmission with fresh oil |
| Transmission components are damaged or worn - Change or repair defective parts |
| Stuck or worn shift linkage - Linkage need to be replaced |
| Hydrostatic pump is defective or blocked - Replace or repair pump |
| Unadjusted or damaged transmission shift control parts - Adjust correctly or replace |
| Transmission oil insufficient - Add oil to the transmission housing |
| Drive sheave is damaged or worn - Change sheave |
| Faulty or unadjusted shifting linkage - Change or adjust linkage |
| Speed control pedal linkage is damaged or out of adjustment - Adjust or change linkage |
| Worn transmission seals or gaskets - Install new seals or gaskets |
| Leaking final drive shaft - Install new shaft seals |
| Transmission case is cracked - Replace case or transmission assembly |
| Mower Deck Troubleshooting |
| Mower vibrates excessively |
| Mower deck drive pulley is worn or dirty - Service or replace pulley |
| Drive belt is damaged or loose - Adjust belt tension or install a new belt |
| Mower blades are warped or not balanced - Balance or change blades |
| Blade bolts are not tightened well - Bolts should be tightened |
| Discharge chute is constantly plugged |
| Ground speed is too fast - Select a slower speed |
| Tall grass - Adjust mower to lower cutting height |
| Engine runs at low revs - Open throttle fully |
| Cutting height is too low - Need to set high cutting height |
| Mower deck drive belt installed incorrectly - Drive belt must be installed correctly |
| Deck clogged with grass clippings - Mower deck needs to be cleaned |
| Excessive blade dullness - Need to sharpen the blades |
| Worn or defective blades - Install new blades |
| High ground speed - Use a lower speed |
| Mower cuts too low - Must be set to high cutting height |
| Bagger is full - Remove grass from bagger |
| Bumpy or unleveled lawn - Roll or level the lawn |
| Low cutting height - Adjust mower to higher cutting height |
| High ground speed - Use a lower speed |
| Improperly leveled mower deck - Deck needs to be adjusted properly |
| Blades are worn or bent - Blades must be changed |
| Tires are not properly inflated - Inflate tires correctly |
| Low tire pressure - Inflate tires correctly |
| Mower deck is not leveled properly - Adjust mower deck level properly |
| Blades are too dull - Need to sharpen the blades |
| Damaged or worn blades - Replace the blades |
| Discharge chute is plugged - Clean out the mower deck |
| Broken mower deck housing - Rebuild or replace mower deck |
| Bent or loose mower spindle - Repair or replace the spindle |
| Electrical Troubleshooting |
| Battery is not charging |
| Wiring connections are loose or corroded - Service or tighten cable connections |
| Battery terminal clamps are defective - Install new terminal clamps |
| Faulty cell in battery - Change the battery |
| Low battery output voltage - Battery needs to be recharged |
| Battery is draining quickly - Service charging system or replace battery |
| Bad terminals or disconnected battery cables - Check cable connections and change or clean terminals |
| Battery is drained or worn - Change or recharge battery |
| Battery wires are disconnected or incorrectly connected - Check wires and connect correctly |
| Battery capacity is low - Battery needs to be recharged |
| Improperly gapped or dirty spark plug - Clean, gap or replace spark plug |
| Damaged starter motor or solenoid - Replace solenoid or repair starter |
________________________________________________________________________________________
________________________________________________________________________________________
| Lawn and Garden Tractors Technical Specs |
