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Husqvarna TS 138 Troubleshooting

The Husqvarna TS 138 2WD lawn tractor was manufactured from 2013 to 2019. The Husqvarna TS138 tractor is powered by 30.5 cubic inches (501 cc) Briggs and Stratton 31R577 4-cycle single cylinder air-cooled gasoline engine with a maximum power of 15 Hp (11.2 kW).

The engine has a fixed main jet carburetor, full pressure lubrication with oil filter, cartridge type air filter, and electronic ignition system. The tractor is fitted with a Tuff Torq K46 hydrostatic transaxle with foot-controlled variable speed drive. The max forward speed - 5.2 mph (8.4 km/h), max reverse speed - 2.2 mph (3.5 km/h).

The Husqvarna TS 138 is equipped with a manual steering system, disc brakes, 15x6.00-6 front tires, and 18x8.50-8 rear tires. The lawn tractor is compatible with a 38" mid-mount 2-blade side discharge mower deck with cutting height of 1.5-4.0 in (38-101 mm), manual blade engagement, 6 cut positions, and mechanical lift system with hand operated.

Engine Troubleshooting
Engine hard to start or will not start
Empty fuel tank - Add fuel
Incorrect fuel grade - Change fuel
Water or air in fuel system - Remove air or water from system
Spark plug wiring connection is defective - Inspect the spark plug wire connection, replace or repair
Spark plug is damaged - Install new spark plug
Fuel filter is plugged - Replace fuel filter
Brake pedal not pushed down - Push the brake pedal down
Carburetor incorrectly set - Set carb correctly
Low cylinder compression - Check cylinder block and replace worn parts
Throttle cable is damaged or adjusted incorrectly - Adjust correctly or replace the cable
Engine runs unevenly
Cooling fins are blocked - Wash or clean as required
Ignition system malfunction - Check ignition and replace faulty components
Stuck or defective choke cable - Service or change the cable
Clogged air filter - Replace or service air filter
Dirty or defective fuel pump - Clean or change fuel pump
Engine starts and stalls immediately
Defective spark plug - Change spark plug as required
Carburetor is clogged or defective - Clean or change carburetor
Ignition coil is damaged - Ignition coil must be replaced
Bad or damaged valve springs - New valve springs need to be installed
Stuck valves - Valves must be cleaned
Engine keeps overheating
Low engine oil level - Checking oil level and add if necessary
Engine overload - Reduce load
Plugged cooling fins - Clean and wash as required
Carburetor fuel mixture is too lean - Adjust carburetor correctly
Ignition timing is incorrect - Set the ignition timing correctly
Valve setting is improper - Adjust valves as required
Engine knocks or noises
Stale or low octane fuel - Change fuel
Excessive engine load - Load reducing required
Lack of engine oil - Check oil level and add oil as required
Low idle speed setting is incorrect - Correct idle settings
Dirty or damaged fuel pump - Test fuel pump and replace if necessary
Crankshaft or main bearings are worn out - Install new parts as as required
Excessive valve clearance - Adjust to proper valve clearance
Piston rings or cylinder bore are worn - Change faulty parts
Lack of engine power
Improperly adjusted or dirty carburetor - Service or properly adjust carburetor
Air filter element is plugged - Replace or service air filter
Dirty or faulty fuel pump - Test fuel pump and change if necessary
Ignition failure - Inspect ignition system and change failed components
Defective cylinder head gasket - Change cylinder head gasket
Burned or stuck valves - Change or service valves
Bent or worn push rod - Install a new push rod
Worn cylinder block parts - Defective components need to be replaced
High fuel consumption
Insufficient throttle opening - Adjust or replace throttle cable
Improper adjustment of carburetor main jet - Adjust the carburetor main jet properly
Faulty or loose spark plug - Re-tighten or change the spark plug
Valves are stuck, burned, or worn - Service or change valves
Worn rings, piston, or sleeve - Replace defective parts as required
Incorrect valve clearance - Adjust to proper valve clearance
Engine consuming too much oil
Worn gaskets or seals - Replace worn parts to avoid leaks
Valve guides and stems are worn - Replace the valves
Stuck or worn piston rings - Replace piston rings
Damaged piston or cylinder liner - Inspect liner and piston, change as necessary
Breather pipe or hose is blocked - Service or replace

Hydrostatic Transmission Troubleshooting
Excessive HST transmission noise
Speed control pedal linkage is damaged or out of adjustment - Repair or adjust linkage
Transmission overload - Load needs to be reduced
Transmission oil is contaminated or oil level is insufficient - Fill to required level or change the transmission oil
Transmission parts are worm or defective - Replace or repair defective components
Shifting is hard
Loose or broken shift linkage - Change defective linkage
Worn or seized hydrostatic pump - Change or repair pump
Worn or misadjusted transmission shift control parts - Adjust properly or change
Loss of power
Transmission oil insufficient - Check transmission oil level and add oil as required
Drive sheave is defective or worn - Replace sheave
Not adjusted or damaged shifter linkage - Adjust properly or replace linkage
Speed control pedal linkage is damaged or out of adjustment - Change or adjust linkage
Transmission leakage
Transmission gaskets or seals are worn - Install new gaskets or seals
Final drive shaft is leaking - Shaft seals need to be changed
Cracked transmission case - Replace case or transmission assembly

Mower Deck Troubleshooting
Excessive mower vibration
Mower deck drive sheave is clogged or worn - Change or clean sheave
Drive belt is loose or defective - Belt needs to be adjusted or replaced
Cutting blades are bent or unbalanced - Balance or replace blades
Loose blade bolts tightening - Bolts need to be tightened
Discharge chute regular clogging
High ground speed - Use a slower speed
Tall grass - Use a lower cutting height
Reduced engine speeds - Open throttle fully
Cutting level is too low - Must be set to high cutting height
Incorrect mower drive belt installation - Install drive belt as required
Mower leaving random uncut of grass
Cutting deck clogging - Clean mower deck as required
Blades are not sharp - Need a blade sharpening
Defective or worn blades - Blades need to be replaced
Fast mowing speed - Select a lower speed
Cutting level is too low - Change cutting height adjustment
Full grass bag - Grass bag must be empty
Blades are scalping the grass
Lawn is uneven or bumpy - Roll or level the lawn
Cutting level is too low - Raise the cutting height
High mowing speed - Operate at slower speed
Mower deck is not leveled properly - Deck should be adjusted correctly
Worn or bent blades - Blades must be changed
Tire pressure is too low - Inflate tires correctly
Mower deck to cut unevenly
Tires are not properly inflated - Inflate tires as required
Mower deck is not leveled properly - Deck should be adjusted correctly
Blades are too dull - Need to sharpen the blades
Blades are worn or damaged - Change the blades
Cutting deck clogging - Inspect and clean cutting deck
Deck shell is damaged - Repair or change the deck
Loose or defective mower spindle - Replace or repair the spindle

Electrical Troubleshooting
Battery is not charging
Electrical wire connections are loose or corroded - Clean or tighten connections
Faulty battery terminal clamps - Change terminal clamps
Battery is worn - Use a new battery
Starter turns slow
Low battery capacity - Charge the battery
Battery won’t hold charge - Battery needs to be serviced or replaced
Wires are disconnected or battery terminals are corroded - Check wiring connections and replace or clean terminals
Starter motor won't turn
Battery is low or faulty - Battery needs to be recharged or replaced
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly
Low battery capacity - Battery needs to be recharged
Incorrectly gapped or worn spark plug - Clean and gap or replace
Starter motor or solenoid is damaged - Repair starter or change solenoid



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