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Husqvarna YT48DXLS Troubleshooting

The Husqvarna YT48DXLS lawn tractor was manufactured from 2017 to 2020. The Husqvarna YT48DXLS driveline components: Kohler KT740 4-cycle OHV twin-cylinder air-cooled gasoline engine or Kawasaki FR691V 4-cycle vertical-shaft V-twin cylinder air-cooled gasoline engine, and Tuff Torq K46 CR belt-driven hydrostatic transaxle with foot-controlled variable speed drive.

The 44.2 cu.in (725 cc) Kohler engine has a cylinder bore of 3.27" (83 mm), piston stroke of 2.64" (67 mm), and rated power of 25 hp (18.6 kW). The 44.3 cu.in (726 cc) Kawasaki engine has a cylinder bore of 3.07" (78 mm), piston stroke of 3.00" (76 mm), and rated power of 23 hp (17.3 kW). The maximum forward speed - 5.7 mph (9 km/h), max. reverse speed - 2.5 mph (4 km/h). The Husqvarna YT48DXLS is equipped with 16x6.50-6 front tires and 20x10.0-8 rear tires. The wheelbase is 48" (1220 mm).

The lawn tractor is compatible with a 48" mid-mount 3-blade side discharge mower deck with cutting height of 1.5-4.0" (38-101 mm), electric blade engagement, and mechanical lift system with hand operated.

Engine Troubleshooting
Engine doesn't start or difficult to start
Fuel tank is empty - Add gasoline
Incorrect fuel grade - Change gasoline
Clogged fuel system - Remove clogging
Defective wiring connection of spark plug - Check the spark plug wire connection, repair or replace
Spark plug is defective - Replace spark plug
Plugged fuel filter - Fuel filter needs changing
Faulty safety switch - Change damaged switch
Carburetor is clogged - Clean the carburetor
Poor cylinder compression - Check cylinder block and change worn parts
Worn or improperly adjusted choke cable - Change cable or adjust properly
Engine runs intermittently
Air intake grill is clogged - Clean and wash as required
Ignition system failure - Check ignition and replace faulty components
Choke cable is stuck or faulty - Change or clean the cable
Plugged air filter - Clean or replace air filter
Dirty or defective fuel pump - Test fuel pump and replace if necessary
Engine stalls after starting
Defective spark plug - Change spark plug as required
Defective or clogged carburetor - Service or replace carburetor
Defective ignition coil - Replace ignition coil as necessary
Bad or damaged valve springs - New valve springs need to be installed
Stuck valves - Clean the valves
Engine is overheated
Engine oil insufficient - Check and refill engine oil
Excessive engine load - Reduce load
Air intake screen is plugged - Wash or clean as required
Too lean fuel mixture in carburetor - Adjust carburetor properly
Ignition timing is improper - Adjust ignition timing as required
Valve setting is improper - Set the valves correctly
Abnormal engine knocking or noise
Stale gasoline - Use proper fuel
Engine is running overloaded - Reduce engine load
Lack of engine oil - Fill up the oil to required level
Incorrect low idle setting - Correct idle adjustment
Dirty or faulty fuel pump - Inspect fuel pump and change as required
Worn crankshaft or main bearings - Worn parts replacement required
Incorrect valve clearance - Check and adjust
Piston rings or cylinder bore are damaged - Replace defective components
Lack of engine power
Carburetor is clogged or improperly adjusted - Service or correctly adjust carburetor
Air filter is dirty - Clean or replace air filter
Dirty or defective fuel pump - Clean or replace fuel pump
Ignition system failure - Test ignition and replace failed parts
Cylinder head gasket is defective - Cylinder-head gasket replacement required
Valves are burned or stuck - Replace or clean valves
Worn or bent push rod - Change push rod
Faulty cylinder block parts - Defective parts need to be replaced
High fuel consumption
Throttle opening is not full - Adjust or change throttle cable
Carburetor main jet adjustment is incorrect - Adjust the carburetor main jet correctly
Spark plug is defective or loose - Tighten or replace spark plug
Valves are stuck, worn, or burned - Clean or replace valves
Worn piston, rings, or sleeve - Replace faulty components
Valve clearance is not correct - Adjust to proper valve clearance
Excessive oil consumption
Gaskets or seals can be faulty - Install new components
Valve stems or guides are damaged - Change the valves
Piston rings are seized or worn - Piston rings need to be replaced
Scuffed cylinder liner or piston - Check piston and liner, install new parts as required
Breather pipe or hose is blocked - Service or change

Hydrostatic Transmission Troubleshooting
HST transmission noise
Worn or unadjusted speed control linkage - Adjust or repair linkage
Excessive transmission load - Reduce transmission load
Dirty transmission fluid or insufficient fluid level - Fill to required level or change the fluid
Worn or defective parts of the hydrostatic transmission - After disassembling and inspection, change defective components
Hard to shift
Stuck or worn shift linkage - Linkage need to be replaced
Hydrostatic pump is stuck or worn - Replace or repair pump
Misadjusted or faulty transmission shift control components - Replace or adjust as required
Loss of power
Low oil level - Need to add transmission oil
Drive pulley is damaged or worn - Install a new pulley
Shifting linkage is misadjusted or broken - Change or adjust linkage
Bent or unadjusted speed control pedal linkage - Change or adjust linkage
Transmission leaking
Worn transmission seals or gaskets - Replace gaskets or seals
Final drive shaft leaks - Shaft seals need to be changed
Transmission case is cracked - Replace case or transmission assembly

Mower Deck Troubleshooting
Excessive mower vibration
Mower deck drive sheave is clogged or worn - Service or replace sheave
Loose or defective drive belt - Belt needs to be adjusted or replaced
Mower blades are unbalanced or bent - Balance blades or replace it
Blade bolts are not tightened well - Tighten it fast
Constant clogging of discharge chute
Fast ground speed - Need to slow down
Long grass - Need to set low cutting height
Engine runs at low revs - Adjust throttle to full opening
Cutting height is too low - Use correct cutting height
Incorrect mower drive belt installation - Reinstall drive belt properly
Patches of grass uncut
Mower deck is clogged - Check cutting deck and clean as necessary
Blades are excessively dull - Need to sharpen the blades
Worn or defective blades - Blades must be changed
Fast ground speed - Need to slow down
Mower deck set to low cutting - Adjust mower to higher cutting height
Bagger is overfilled - Remove grass from bagger
Blades scalping grass
Bumpy or unleveled lawn - Roll or level the lawn
Cutting level is too low - Need to set high cutting height
Mowing speed is too high - Select a slower speed
Mower deck is not leveled properly - Deck needs to be adjusted properly
Bent or worn blades - Replace the blades
Tires are not properly inflated - Check and inflate the tires
Mower cutting is uneven
Low tire pressure - Inflate tires as required
Deck is not leveled correctly - Adjust mower deck level properly
Blades are excessively dull - Need to sharpen the blades
Worn or defective blades - Install new blades
Cutting deck clogging - Check cutting deck and clean as necessary
Deck shell is broken - Rebuild or replace mower deck
Mower spindle is bent or loose - Repair or change the spindle

Electrical Troubleshooting
Battery won’t charge
Electrical cable connections are corroded or loose - Service or tighten cable connections
Battery terminal clamps are defective - Terminal clamps need to be replaced
Battery bad cell - Install a new battery
Starter cranks slow
Low battery output voltage - Battery is drained, charge it
Battery discharges quickly - Service battery or change it
Disconnected battery cables or bad terminals - Check cable connections and change or clean terminals
Starter will not crank
Battery is discharged or defective - Charge or replace the battery
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly
Low battery output voltage - Battery needs to be recharged
Spark plug worn or incorrectly gapped - Clean and gap or replace
Solenoid or starter motor failure - Starter/solenoid needs to be replaced



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