Husqvarna YTH20K46 Parts Manual

The Husqvarna YTH20K46 is a 20 HP Kohler Courage twin-cylinder riding lawn tractor with a 46-inch fabricated mower deck, hydrostatic transmission, and electric PTO. This manual provides detailed parts lists, diagrams, and ordering information for maintenance and repair. Below are key sections for identification, engine parts, deck parts, drive system, electrical, and ordering.

1. Model Identification & Specifications 2. Engine Components 3. Mower Deck Assembly 4. Drive & Transmission 5. Electrical System 6. Controls & Operator Station 7. Frame & Body 8. Fasteners & Hardware 9. Maintenance Parts 10. Parts Ordering Information 11. Troubleshooting & Diagrams

Model Identification & Specifications

Locate the model and serial number plate on the frame under the seat or on the rear fender. Key specifications for the YTH20K46.

Feature	Description
Model Number	YTH20K46 (Example: 96043012300)
Engine	Kohler Courage SV590, 20 HP, Twin Cylinder
Cutting Width	46 inches (Fabricated Deck)
Transmission	Hydrostatic, Infinite Forward/Reverse
Fuel Capacity	2.5 Gallons
Oil Capacity (Engine)	1.5 Quarts (with filter)
Battery	12V, 280 CCA
Blade Spindle Type	Sealed Bearing
Drive System	Rear Wheel Drive
Weight	Approx. 500 lbs

Engine Components

Parts for the Kohler Courage SV590 engine. Always use genuine Kohler or Husqvarna parts.

Air Filter: Replaceable element and pre-cleaner.
Spark Plugs: Champion RC12YC or equivalent, gap 0.030".
Oil Filter: Kohler 12 050 01-S or Husqvarna equivalent.
Fuel Filter: In-line filter, replace annually.
Starter Motor: 12V electric starter assembly.
Carburetor: Complete assembly and gaskets.
Muffler & Exhaust: Complete exhaust system.

WARNING! Disconnect spark plug wire before servicing engine. Allow engine to cool.

Mower Deck Assembly

46-inch fabricated deck parts list. Includes blades, spindles, belts, and hardware.

Blades: High-lift, mulching, or standard (part #532404963).
Spindle Assembly: Complete sealed bearing spindle (part #532404964).
Deck Belt: V-belt for deck drive (part #532404965).
Idler Pulleys: Tensioner and guide pulleys.
Deck Wheels: Anti-scalp rollers and hardware.
Deck Shell: Fabricated steel deck, replacement panels.
PTO Clutch: Electric clutch assembly and switch.

CAUTION! Ensure deck is securely supported and engine off before servicing.

Drive & Transmission

Transmission: Tuff Torq K46 hydrostatic unit.
Drive Belt: Main drive belt from engine to transmission.
Axle & Hubs: Rear axle assembly and wheel hubs.
Brake: Disc brake assembly and cable.
Control Linkage: Hydrostatic control rod and lever.
Filter & Oil: Transmission filter and fluid (20W50).
Pulleys: Engine drive pulley and idler assemblies.

Electrical System

Wiring harness, switches, sensors, and battery components.

Key Parts: Battery (12V, Group U1), Starter Solenoid, Ignition Switch, PTO Switch, Safety Seat Switch, Hour Meter, Voltage Regulator, Alternator Stator, Fuses (20A, 30A).

Diagram: Refer to wiring schematic in section 11. Always disconnect battery negative terminal before electrical work.

Controls & Operator Station

Steering wheel, seat, pedals, levers, and dash components.

Turn off tractor and set parking brake before adjustments.
Steering: Steering wheel, column, and tie rods.
Seat: Seat assembly, suspension, and mounting hardware.
Pedals: Brake and cruise control pedals.
Levers: PTO engagement lever, hydrostatic control lever.

Tip: Lubricate control linkages periodically with general-purpose grease.

Frame & Body

Supports tractor structure: frame, fenders, hood, grille.

Frame: Main welded steel frame assembly.
Fenders: Rear fenders with mounting brackets.
Hood: Front hood, hinges, and latch.
Grille: Front grille and screen.
Footrests: Floorboards and footplates.
Chute: Grass discharge chute and deflector.
Decals: Safety and instructional labels.

WARNING! Inspect frame for cracks or damage annually. Do not weld without manufacturer guidance.

Fasteners & Hardware

Bolts, nuts, washers, pins, and clips used throughout tractor. Specify grade and thread.

Maintenance Parts

Filters, fluids, lubricants, and wear items for routine service.

CAUTION! Use only recommended fluids. Dispose of used oil and filters properly.

Parts Ordering Information

Use the model and serial number when ordering. Contact an authorized Husqvarna dealer or visit www.husqvarna.com. Genuine parts ensure warranty coverage and proper fit. International support: 1-800-487-5952.

Troubleshooting & Diagrams

Symptom	Possible Cause	Corrective Action
Engine won't start	Battery, fuel, spark	Check battery charge; ensure fuel valve on; inspect spark plug.
Poor cutting quality	Dull blades, deck level	Sharpen/replace blades; level deck; check belt tension.
Transmission slips	Low fluid, worn belt	Check transmission fluid level; inspect drive belt for wear.
PTO won't engage	Switch, clutch, fuse	Test PTO switch; check electric clutch connection; replace fuse.
Excessive vibration	Unbalanced blade, loose parts	Inspect blades for damage; tighten spindle bolts and deck hardware.

Diagrams: Refer to exploded-view diagrams for part numbers and assembly.

Service: 1-800-487-5952; www.husqvarna.com