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Craftsman YT-4000 Troubleshooting
The
Craftsman YT4000 lawn tractor was manufactured by Husqvarna built from 2009 to
2013. The Craftsman YT 4000 tractor is powered by Briggs and Stratton 445677
4-cycle V-twin cylinder OHV 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 24 hp (17.8 kW) at 3400 rpm.
The Craftsman YT4000 is fitted with 3 transmission options: mechanical
transmission with 6 forward and 1 reverse gears, Tuff Torq K46
belt-driven hydrostatic transmission with foot-controlled variable speed
drive, and Hydro Gear hydrostatic transmission with infinite forward and
reverse gears. The maximum travel speed (forward/reverse): 5.4 mph (8.7
km/h) and 2.9 mph (4.7 km/h).
The Craftsman YT4000 was equipped with a manual steering, disc brakes,
15x6.00-6 front tires, and 20x8.00-8 or 18x9.50-8 rear tires. The
tractor is compatible with 42" or 46" mid-mount 2-blade mower deck with
cutting height of 1.0-4.0 in (25-100 mm), six cut positions, and manual
lift system.
| Engine Troubleshooting |
| Engine is not starting or hard starting |
| Empty fuel tank - Add fuel |
| Low-quality gasoline - Use correct fuel grade |
| Air or water in fuel system - Remove water or air from fuel system |
| Loose or disconnected spark plug wire - Inspect the spark plug wire connection, replace or repair |
| Spark plug is damaged - Spark plug need to be replaced |
| Dirty fuel filter - Install new filter |
| Defective safety switch - Replace if required |
| Incorrect carburetor adjustment - Adjust carburetor idle mixture screw |
| Poor compression - Inspect and replace wear parts |
| Incorrectly adjusted or damaged throttle cable - Change cable or adjust properly |
| Engine runs intermittently |
| Cooling fins are plugged - Need to clean or wash |
| Ignition system failure - Test ignition and replace failed parts |
| Stuck or defective throttle cable - Service or replace the cable |
| Dirty air filter element - Replace or service air filter |
| Fuel pump is damaged or dirty - Service or change fuel pump |
| Faulty spark plug - Install new spark plug |
| Faulty or dirty carburetor - Replace or service carburetor |
| Ignition coil is faulty - Replace ignition coil as necessary |
| Broken or loose valve springs - Change valve springs |
| Stuck valves - Clean the valves |
| Engine oil level is low - Need to add engine oil |
| Engine is under excessive load - Reduce load |
| Air intake screen is plugged - Need to clean or wash |
| Carburetor is running lean - Set the carburetor correctly |
| Incorrect ignition timing - Ignition timing needs to be adjusted correctly |
| Valve setting is improper - Valves needs to be set correctly |
| Abnormal engine noise or knocking |
| Stale fuel - Use correct gasoline |
| Excessive engine load - Reduce the load |
| Engine oil level low - Need to add engine oil |
| Low idle speed set incorrectly - Correct the settings |
| Fuel pump is faulty or clogged - Clean or change fuel pump |
| Worn crankshaft or main bearings - Crankshaft or bearings need to be replaced |
| Valve clearance is improper - Adjustment procedure required |
| Cylinder bore or piston rings are damaged - Replace defective components |
| Carburetor is incorrectly adjusted or dirty - Adjust the carburetor properly or clean it |
| Air filter element is plugged - Replace or clean air filter |
| Fuel pump is faulty or clogged - Test fuel pump and change if necessary |
| Ignition system problems - Inspect ignition system and change faulty parts |
| Cylinder head gasket is worn - Install new head gasket |
| Valves are burned or stuck - Service or change valves |
| Push rod is worn or defective - Push rod needs to be changed |
| Faulty cylinder block components - Change defective components |
| Engine using too much gasoline |
| Throttle not fully open - Check throttle cable and adjust as required |
| Improper adjustment of carburetor main jet - Adjust it properly |
| Spark plug is loose or defective - Re-tighten or replace spark plug |
| Worn, stuck, or burned valves - Replace or clean valves |
| Sleeve, piston, or rings are damaged - Change defective parts |
| Valve clearance is wrong - Need to adjust valve clearance |
| Excessive engine oil consumption |
| Defective seals or gaskets - Replace defective parts |
| Damaged valve stems or valve guides - Change the valves |
| Piston rings are seized or worn - Replace piston rings |
| Scored piston or cylinder liner - Inspect piston and liner, fit new components as necessary |
| Breather pipe or hose is blocked - Change or service |
| Transmission Troubleshooting |
| Hard shifts |
| Worn or rusty gear shift linkage - Install new shift linkage |
| Shift forks are damaged or worn - Replace the shift forks |
| Gearshift mechanism is damaged - Replace or repair the mechanism |
| Transmission is excessively noisy |
| Low oil level - Check transmission oil level and add oil as required |
| Transmission fluid is contaminated - Fill up with new transmission fluid |
| Worn bearings or damaged gears - Change bearings or gears |
| Transmission jumps out of gear |
| Shift lever is damaged or installed improperly - Replace or install shift lever correctly |
| Gears are damaged or worn - Replace defective gears |
| Faulty shift rods or shift forks - Change defective forks or rods |
| Drive shaft/belt is improperly adjusted or damaged - Adjust or change belt/shaft |
| Clutch/brake is defective or improperly adjusted - Change clutch/brake or adjust it |
| Faulty or worn drive sheave - Replace sheave |
| Hydrostatic Transmission Troubleshooting |
| HST transmission is excessively noisy |
| Speed control linkage is worn or unadjusted - Adjust or repair linkage |
| Transmission overloaded - Reduce transmission load |
| Oil is dirty or oil level is too low - Add oil to the correct level or fill the transmission with fresh oil |
| Transmission parts are worm or defective - Replace or repair defective components |
| Shift linkage is stuck or damaged - Clean or change linkage |
| Hydrostatic pump is faulty or seized - Change or repair pump |
| Transmission shift control parts are faulty or unadjusted - Adjust correctly or replace |
| Insufficient transmission fluid - Need to add transmission fluid |
| Faulty or worn drive sheave - Install a new sheave |
| Shifting linkage is misadjusted or broken - Replace or adjust linkage |
| Worn or unadjusted speed control linkage - Repair or adjust linkage |
| Damaged transmission seals or gaskets - Replace gaskets or seals |
| Leaking final drive shaft - Install new shaft seals |
| Transmission case is cracked - Change broken case |
| Mower Deck Troubleshooting |
| Mower vibrates too much |
| Drive sheave of mower deck is dirty or worn - Replace or service sheave |
| Damaged or loose drive belt - Change belt or adjust belt tension |
| Mower blades are warped or not balanced - Balance or replace blades |
| Blade bolts are not tightened well - Tighten bolts as required |
| Discharge chute regular clogging |
| Fast ground speed - Use a slower speed |
| Long grass - Adjust mower to lower cutting height |
| Engine rpm is too low - Adjust choke to full opening |
| Mower deck set to low cutting - Change cutting height adjustment |
| Drive belt installation is not correct - Install drive belt correctly |
| Lawn mower leaving uncut grass |
| Mower deck is clogged - Clean mower deck as required |
| Blades are not sharp - Blades need to be sharpened |
| Worn or damaged blades - Install new blades |
| Fast mowing speed - Use a slower speed |
| Low cutting height - Must be set to high cutting height |
| Full grass bag - Clean grass bag |
| Bumpy or not smooth lawn - Roll or level the lawn |
| Cutting level is too low - Adjust mower to higher cutting height |
| High ground speed - Use a lower speed |
| Mower deck is not leveled properly - Adjust mower deck level properly |
| Bent or worn blades - Replace the blades |
| Low tire inflation - Correct tire pressure |
| Mower deck to cut unevenly |
| Tires are not correctly inflated - Inflate tires as required |
| Deck level is not correct - Deck needs to be adjusted properly |
| Excessive blade dullness - Need a blade sharpening |
| Worn or bent blades - Blades must be changed |
| Discharge chute is plugged - Need to clean the mower deck |
| Deck housing is broken - Repair or change the deck |
| Mower spindle is bent or loose - Repair or change the spindle |
| Electrical Troubleshooting |
| Battery is not charging |
| Corroded or loose cable connections - Tighten or service connections |
| Battery terminal clamps are defective - Change terminal clamps |
| Defective battery - Battery change required |
| Battery power is low - Battery is drained, charge it |
| Battery does not hold charge - Service charging system or install new battery |
| Disconnected battery cables or bad terminals - Connect cables correctly or replace terminals |
| Battery is discharged or defective - Recharge or replace battery |
| Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required |
| Battery capacity is low - Battery is drained, recharge it |
| Improperly gapped or dirty spark plug - Clean and gap or replace |
| Starter motor or solenoid failing - Starter/solenoid needs to be replaced |
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| Lawn and Garden Tractors Technical Specs |
