The Husqvarna YTH 18542 is a riding lawn mower featuring a 42-inch cutting deck, 18.5 HP Briggs & Stratton engine, hydrostatic transmission, and a durable steel frame. This parts manual provides detailed diagrams, part numbers, and ordering information for maintenance, repair, and replacement of components. Below are key sections covering safety, identification, engine parts, deck assembly, drive system, controls, and troubleshooting.
Locate the model and serial number plate on the frame under the seat or on the rear fender for accurate parts identification.
| Feature | Description |
|---|---|
| Model | YTH 18542 |
| Engine | 18.5 HP Briggs & Stratton, single-cylinder, OHV |
| Cutting Width | 42 inches |
| Transmission | Hydrostatic, foot-pedal controlled |
| Deck Material | Fabricated steel |
| Fuel Capacity | 2.5 gallons |
| Cutting Height Adjustment | Lever-operated, 1.5 to 4 inches |
| Drive System | Rear-wheel drive |
| Seat | High-back, adjustable |
| Warranty | Limited residential warranty (refer to original purchase documents) |
Critical safety components and decals must be maintained and replaced if damaged or illegible.
WARNING! Never operate mower with missing, damaged, or unreadable safety labels. Replace immediately.
Briggs & Stratton 18.5 HP engine parts list for model YTH 18542.
CAUTION! Disconnect spark plug wire before performing any engine maintenance.
Hydrostatic transmission parts for forward/reverse motion.
Transmission: Tuff Torq K46 or equivalent. Includes filter, fluid, and cooling fan.
Drive Belt: Main drive belt from engine to transmission. Part number 954-XXXXX.
Axle & Rear Wheels: Hex shaft, axle bearings, and rear wheel hubs.
Brake: Disc or band brake assembly for parking and safety.
Release Valve: Manual release lever for pushing mower without starting engine.
Steering, dash, and control components.
Tip: Lubricate control cables periodically for smooth operation.
Supports and mobility components.
WARNING! Check tire pressure monthly (12 PSI front, 10 PSI rear). Incorrect pressure affects stability and cutting quality.
12V electrical components wiring diagram included in full manual.
| Component | Part Number |
|---|---|
| Battery | 12V, 280 CCA, U1R type |
| Starter Solenoid | Briggs & Stratton 692051 or equivalent |
| Voltage Regulator | For charging system |
| Safety Switches | Seat, brake, PTO interlock switches |
| Headlights | 12V halogen bulbs (if equipped) |
| Wiring Harness | Main harness with connectors |
Regular maintenance part requirements.
Every 8 hours: Check tire pressure, inspect blades.
Every 50 hours: Change engine oil, check belts, lubricate spindles and linkages.
Every 100 hours: Replace air filter, spark plug, check transmission fluid.
Seasonal: Sharpen/replace blades, clean deck, battery maintenance, store properly.
CAUTION! Use only recommended fluids and parts. Refer to engine manual for specific oil type.
For genuine Husqvarna parts, contact an authorized dealer or visit the official parts website.
Keep this manual for future reference. Part numbers are subject to change.
| Symptom | Possible Cause | Parts to Check/Replace |
|---|---|---|
| Engine won't start | Dead battery, bad spark plug, faulty safety switch | Battery, spark plug, seat switch, ignition switch |
| Poor cutting performance | Dull blades, worn deck belt, low engine RPM | Blades, deck drive belt, PTO clutch |
| Loss of drive power | Worn drive belt, low transmission fluid | Main drive belt, transmission filter/fluid |
| Excessive vibration | Unbalanced blade, damaged spindle | Blade set, spindle assembly, deck bearings |
| Hydrostatic transmission sluggish | Old fluid, clogged filter, cooling fan damage | Transmission fluid & filter, cooling fan |
Reset: For electrical issues, disconnect battery for 5 minutes to reset safety system.
Service: For technical assistance, contact Husqvarna at 1-800-487-5952 or visit www.husqvarna.com.