The Toro Model 20334 is a commercial-grade walk-behind mower designed for professional landscaping and heavy-duty residential use. This parts manual provides detailed diagrams, part numbers, and ordering information for all components of the mower, including the engine assembly, cutting deck, drive system, controls, wheels, and safety features. Below are key sections for identification, exploded views, parts lists, ordering instructions, and maintenance guidelines.
Locate the product identification label on the mower frame. The serial number is required for ordering correct parts.
| Component | Location | Description |
|---|---|---|
| Model Number | Right side of frame | 20334 (stamped on metal plate) |
| Serial Number | Below model number | Unique 8-digit code (e.g., 12345678) |
| Engine Model | On engine shroud | Briggs & Stratton 850 Series |
| Manufacture Date | Adjacent to serial | Month/Year code (e.g., 04/2023) |
NOTE: Always provide the full model and serial number when ordering parts.
Critical safety parts must be replaced with genuine Toro components to maintain operator safety and warranty.
WARNING! Never operate the mower with damaged or missing safety components. Replace immediately.
Exploded view of the Briggs & Stratton 850 Series engine with associated parts.
CAUTION! Disconnect spark plug wire before servicing engine components.
21-inch steel cutting deck with single blade system. Replace blades annually or when damaged.
| Part Name | Part Number | Quantity |
|---|---|---|
| Cutting Blade (Standard) | 34567-20 | 1 |
| Blade Adapter | 34568-21 | 1 |
| Blade Bolt (5/8"-18) | 34569-22 | 1 |
| Deck Housing | 34570-23 | 1 |
| Deck Skid Shoes | 34571-24 | 2 |
| Spindle Assembly | 34572-25 | 1 |
Tip: Balance blade after sharpening. Use torque wrench to tighten blade bolt to 45 ft-lbs.
Variable speed drive system with belt-driven transmission.
NOTE: Check belt tension every 50 operating hours. Replace if cracked or worn.
Adjustable control handle with integrated cables for drive and blade control.
Installation: Lubricate cable ends before installation. Adjust cables per service manual.
8-inch rear wheels, 7-inch front wheels. All wheels include ball bearings.
| Wheel Position | Part Number | Includes Bearing |
|---|---|---|
| Front Wheel (7") | 67890-50 | Yes |
| Rear Wheel (8") | 67891-51 | Yes |
| Front Axle | 67892-52 | N/A |
| Rear Axle | 67893-53 | N/A |
| Wheel Bearing (Sealed) | 67894-54 | Each |
| Axle Spacers (Set) | 67895-55 | 4 pieces |
Maintenance: Check wheel bearings annually. Replace if rough or noisy.
1-gallon fuel tank with fuel filter and primer bulb. Paper element air filter.
CAUTION! Drain fuel before storing mower. Replace fuel filter every season.
12V electrical system for starting and safety interlocks.
Troubleshooting: Check all connections for corrosion. Test switches with multimeter.
Common hardware kits for general maintenance and assembly.
| Kit Description | Part Number | Contents |
|---|---|---|
| Deck Bolt Kit | 90123-80 | Bolts, nuts, washers for deck mounting |
| Handle Bolt Kit | 90124-81 | All bolts for handle assembly |
| General Hardware Kit | 90125-82 | Assorted screws, pins, clips |
| Blade Bolt Kit | 90126-83 | Blade bolt, washer, lock washer |
Note: Use only grade 5 or higher hardware for structural components.
How to order genuine Toro parts and access technical support.
Warranty: 3-year commercial warranty. Keep proof of purchase. Unauthorized parts may void warranty.
Exploded Diagrams: Available at dealer or online parts lookup.