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 a comprehensive parts list, diagrams, and ordering information for maintenance, repair, and replacement of components. Below are key sections for identification, engine parts, drive system, cutting deck, electrical system, and ordering.

1. Tractor Identification 2. Engine & Related Parts 3. Drive System & Transmission 4. Mower Deck Assembly 5. Electrical System 6. Controls & Operator Station 7. Frame & Body Parts 8. Maintenance Parts & Kits 9. Parts Diagrams & Exploded Views 10. Ordering Information & Support

Tractor Identification

Locate your model and serial number for accurate parts identification. Key identifiers: Model YTH20K46, Serial Number (stamped on frame near right rear wheel).

Identifier	Location	Purpose
Model Number	Product identification label	Specifies exact tractor configuration
Serial Number	Frame near right rear wheel	Unique identifier for manufacturing date and parts lookup
Engine Model	Stamped on engine block (Kohler Courage SV590)	For engine-specific parts
Deck Model	Tag on mower deck	For cutting deck parts

Engine & Related Parts

Parts for the Kohler Courage SV590 20 HP twin-cylinder engine.

Air Filter System: Air filter element, pre-cleaner, housing.
Fuel System: Fuel pump, carburetor, fuel lines, fuel filter.
Ignition System: Spark plugs, ignition coils, flywheel.
Cooling System: Cooling fins, blower housing, fan.
Lubrication: Oil filter, dipstick, oil drain tube.
Exhaust: Muffler, exhaust gasket, heat shield.

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

Drive System & Transmission

Hydrostatic transmission (Tuff Torq K46) and related drive components.

Transmission Assembly: Complete hydrostatic unit, fluid filter.
Drive Belt: Main drive belt (length and width specific to model).
Axle & Wheels: Rear axle, wheel hubs, tires (20x10-8 rear, 15x6.00-6 front).
Brake System: Brake pedal, brake disc, caliper assembly.
Shift Linkage: Control rod, lever, bushings.

CAUTION! Ensure tractor is on level surface and parking brake engaged before servicing drive system.

Mower Deck Assembly

46-inch fabricated steel deck with three spindle assemblies.

Deck Shell: Main deck housing, baffles, discharge chute.
Spindle Assemblies: Blade spindles, bearings, pulleys, seals.
Cutting Blades: Standard high-lift blades (part number specific).
Deck Belt: PTO belt for deck drive.
Deck Wheels: Gauge wheels and brackets.
Lift System: Deck lift linkage, springs, pins.

Electrical System

12-volt electrical system with battery, starter, and wiring harness.

Key Components: Battery (12V, 280 CCA), Starter Motor, Alternator/Charging System, Ignition Switch, Safety Interlock Switches (seat, PTO, brake), Fuses, Wiring Harness, Headlights.

Diagram references for wire routing and connector locations. Battery cables (positive and negative). Solenoid for starter circuit. PTO Clutch (electric engagement).

Controls & Operator Station

Parts for the operator's area and control systems.

Turn off tractor and remove key before accessing controls.
Steering System: Steering wheel, steering column, tie rods.
Control Panel: Ignition key switch, PTO switch, throttle/choke controls.
Seat & Mount: Seat assembly, seat switch, seat mounting bracket.
Pedals: Brake pedal, cruise control pedal (if equipped), linkages.

Tip: Lubricate control linkages periodically for smooth operation.

Frame & Body Parts

Structural and cosmetic parts of the tractor.

Frame: Main chassis, reinforcement brackets.
Body Panels: Hood, side panels, grille, decal kit.
Fenders: Rear fenders, mounting hardware.
Footrests: Operator platform, foot plates.
Bumper: Front bumper (if equipped).

WARNING! Frame components are heavy; use proper lifting equipment or assistance.

Maintenance Parts & Kits

Common replacement items and service kits.

Oil Change Kit: Includes oil filter and crush washer. Air Filter Kit: Primary and pre-cleaner. Spark Plug Set: Two plugs, pre-gapped. Belt Kit: Main drive and mower deck belts. Blade Set: Set of three high-lift blades. Grease: Recommended chassis grease.

Parts Diagrams & Exploded Views

Refer to numbered diagrams for component relationship and assembly order.

Diagram Reference	Assembly	Key Parts Numbered
Figure 1	Engine Assembly	1-45 (Cylinder head, crankcase, covers)
Figure 2	Mower Deck	1-38 (Spindles, belts, idlers)
Figure 3	Drive & Transmission	1-22 (Transaxle, axle, brake)
Figure 4	Electrical System	1-30 (Wiring, switches, battery)
Figure 5	Controls & Steering	1-18 (Steering column, linkages)

Reset: Use diagrams with parts list for accurate ordering.

Ordering Information & Support

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © 2025 Husqvarna; trademarks of Husqvarna AB. For genuine Husqvarna parts, use the part numbers listed in this manual. For support, visit www.husqvarna.com or contact 1-800-487-5962.

Troubleshooting Parts Issues

Symptom	Possible Cause	Corrective Action
Part does not fit	Wrong part number or model	Verify model & serial number; re-check part number against diagram.
Missing hardware	Kit incomplete	Contact parts supplier with kit number for missing bolts/washers.
Part worn quickly	Installation error or mismatch	Ensure part is installed per diagram; check for compatible wear items.
Diagram unclear	Reference error	Use latest manual version online; contact support for clarification.
Cannot locate part	Discontinued or updated	Check for superseded part number; contact Husqvarna for replacement.

Service: 1-800-487-5962; www.husqvarna.com