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Husqvarna CTH126 Troubleshooting

The Husqvarna CTH 126 lawn tractor was manufactured between 2009 and 2014. The Husqvarna CTH126 tractor is powered by Briggs and Stratton 21R707 Intek 4-cycle single cylinder OHV vertical shaft air-cooled gasoline engine with a rated power of 11.5 hp (8.5 kW), or Briggs and Stratton 219807 Power Built 4-cycle single cylinder OHV vertical shaft air-cooled gasoline engine with a rated power of 12.5 hp (9.3 kW).

The Husqvarna CTH 126 is fitted with Hydro-Gear T2 belt-driven hydrostatic transmission with infinite forward and reverse gears. Max. forward speed - 5 mph (8 kph), maximum reverse speed - 2.2 mph (3.5 kph). The tractor is equipped with a manual steering system, disc brakes, 13x5.00-6 front tires, and 16x6.50-8 rear tires. The wheelbase is 46.8 in (1190 mm).

The Husqvarna CTH 126 is compatible with a 30" mid-mount 1-blade mower deck with electric blade engagement, cutting height of 0.8-3.2 in (20-80 mm), 6 cut positions, and manual lift system.

Engine Troubleshooting
Engine hard to start or won't start
Fuel tank is empty - Fill it up
Improper fuel grade - Change gasoline
Dirty fuel system - Check and clean
Spark plug wiring connection is damaged - Inspect spark plug wiring connection, change or repair
Faulty spark plug - Spark plug need to be replaced
Clogged fuel filter - Install new filter
Brake pedal not pushed down - Push the brake pedal down
Carburetor not adjusted - Adjust according to instructions
Low cylinder compression - Check cylinder block and replace worn parts
Damaged or not adjusted choke cable - Adjust correctly or change the cable
Engine runs unevenly
Air intake screen is blocked - Wash or clean as required
Ignition system is defective - Test ignition and replace failed parts
Faulty or stuck throttle cable - Clean or replace the cable
Clogged air filter - Replace or clean air filter
Clogged or defective fuel pump - Clean or install new fuel pump
Engine starts and stops immediately
Faulty spark plug - Spark plug need to be replaced
Defective or clogged carburetor - Service or change carburetor
Faulty ignition coil - Ignition coil should be replaced
Bad or broken valve springs - Change valve springs
Valves are stuck - Valves must be cleaned
Engine keeps overheating
Not enough engine oil - Fill the crankcase with engine oil
Engine is running overloaded - Reduce load
Air intake screen is blocked - Wash or clean as required
Carburetor is running lean - Set the carburetor properly
Wrong ignition timing - Ignition timing needs to be set properly
Valve setting is incorrect - Set the valves properly
Engine noises or knocks
Stale fuel - Use proper gasoline
Engine is running overloaded - Load reducing required
Low engine oil level - Check oil level and add oil as required
Incorrectly set low idle speed - Correct the settings
Fuel pump is faulty or clogged - Check fuel pump and change if required
Main bearings or crankshaft are worn out - Install new parts as as required
Valve clearance is improper - Check and adjust
Piston rings or cylinder bore are worn - Change faulty components
Lack of engine power
Carburetor is incorrectly adjusted or dirty - Clean or properly adjust carburetor
Air filter is blocked - Replace or service air filter
Fuel pump is dirty or defective - Test fuel pump and change if necessary
Defective ignition - Check ignition system and replace faulty parts
Defective cylinder head gasket - Cylinder-head gasket replacement required
Stuck or burned valves - Replace or clean valves
Worn or defective push rod - Push rod needs to be changed
Damaged cylinder block parts - Change defective components
Excessive fuel consumption
Insufficient throttle opening - Adjust or replace throttle cable
Carburetor main jet is improperly adjusted - Adjust it correctly
Spark plug is loose or faulty - Tighten or replace spark plug
Valves are stuck, worn, or burned - Change or clean valves
Piston, sleeve, or rings are damaged - Change defective components
Excessive valve clearance - Check and adjust
Engine using too much oil
Gaskets or seals are excessively worn - Change worn parts according to specifications
Valve guides or stems are damaged - Install new valves
Seized or wear piston rings - Install new piston rings
Scored cylinder liner or piston - Check piston and liner, install new parts as required
Blocked breather pipe or hose - Clean or change

Hydrostatic Transmission Troubleshooting
Hydrostatic transmission noise
Worn or out of adjustment speed control linkage - Adjust or replace linkage
Excessive transmission load - Load needs to be reduced
Transmission fluid is dirty or fluid level is too low - Fill to required level or change the fluid
Damaged or worn components of hydrostatic transmission - Check hydrostatic transmission components for defect or damage and change if necessary
Shifting is hard
Shift linkage is rusty or worn - Lubricate or replace the linkage
Hydrostatic pump is faulty or seized - Repair or change pump
Transmission shift control parts are damaged or misadjusted - Change or adjust correctly
Loss of power
Lack of transmission fluid - Add fluid to the transmission housing
Drive sheave is worn or faulty - Install a new sheave
Broken or not adjusted shift linkage - Adjust properly or replace linkage
Defective or not adjusted speed control pedal linkage - Adjust or repair linkage
Transmission leaking
Transmission gaskets or seals are worn - Change seals or gaskets
Final drive shaft leakage - Install new shaft seals
Cracked transmission housing - Replace housing or transmission assembly

Mower Deck Troubleshooting
Mower vibrates excessively
Damaged or clogged mower drive pulley - Replace or service pulley
Worn or loose drive belt - Adjust belt tension or change the belt
Bent or unbalanced cutting blades - Balance or change blades
Blade mounting bolts are loose - Bolts should be tightened
Discharge chute is regularly plugged
High mowing speed - Operate at slower speed
Grass is too long - Must be set to low cutting height
Engine runs at low revs - Open choke fully
Cutting level is too low - Must be set to high cutting height
Improper drive belt installation - Drive belt must be installed correctly
Mower leaving random uncut of grass
Discharge chute is plugged - Clean mower deck as required
Blades are too dull - Need a blade sharpening
Worn or defective blades - Blades need to be replaced
High ground speed - Select a lower speed
Mower cuts too low - Must be set to high cutting height
Bagger is full - Clean bagger
Blade scalped grass
Lawn is not level or bumpy - Lawn leveling required
Mower cuts too low - Use a higher cutting height
Fast ground speed - Use a slower speed
Deck is not leveled correctly - Deck should be adjusted correctly
Bent or worn blades - Replace the blades
Tires are not correctly inflated - Check and inflate the tires
Uneven cut
Tires are not properly inflated - Check and inflate the tires
Incorrect level of mower deck - Deck should be adjusted correctly
Not sharp blades - Sharpen the blades
Damaged or worn blades - Blades need to be replaced
Discharge chute is plugged - Clean out the mower deck
Deck housing is damaged - Repair or change the deck
Bent or loose mower spindle - Repair or replace the spindle

Electrical Troubleshooting
Battery cannot be charged
Corroded or loose wire connections - Service or tighten cable connections
Battery terminal clamps are faulty - Change terminal clamps
Battery is defective - Battery change required
Starter motor turns slow
Battery capacity is low - Battery is drained, recharge it
Battery is draining quickly - Service or change the battery
Faulty battery terminals or disconnected cables - Connect cables properly or replace terminals
Starter will not crank
Battery is drained or worn - Charge or change the battery
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly
Battery voltage is low - Battery is drained, recharge it
Faulty or incorrectly gapped spark plug - Replace or clean and gap
Defective solenoid or starter motor - Starter/solenoid should be replaced



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