The Toro 21386 is a commercial-grade walk-behind mower designed for professional landscaping and grounds maintenance. This service manual provides comprehensive information for the maintenance, troubleshooting, and repair of the mower's engine, cutting deck, drive system, and safety components. Below are key sections covering safety, specifications, maintenance procedures, troubleshooting, and parts information.
Key components: Commercial-grade engine, reinforced steel cutting deck, hydrostatic drive system, operator presence controls, and adjustable cutting height.
| Feature | Description |
|---|---|
| Engine | Commercial OHV engine with electric start |
| Cutting Width | 21-inch reinforced steel deck |
| Drive System | Hydrostatic transmission with variable speed control |
| Cutting Height Adjustment | Single-lever adjustment for all wheels |
| Blade Engagement | Electric PTO (Power Take-Off) clutch |
| Fuel Capacity | 1.5-gallon fuel tank |
| Safety Features | Operator presence control, blade brake clutch |
| Mulching Capability | Standard mulching kit included |
| Wheels | 10-inch rear, 8-inch front with ball bearings |
| Weight | Approximately 95 lbs |
Always follow safety procedures to prevent injury or equipment damage.
WARNING! Never attempt to bypass safety switches. Always allow engine to cool before servicing.
Regular maintenance ensures optimal performance and longevity.
| Interval | Service Required |
|---|---|
| Before each use | Check engine oil level, inspect for loose parts, check blade condition |
| Every 8 hours | Clean underside of deck, check tire pressure |
| Every 25 hours | Change engine oil (first change at 5 hours), clean/replace air filter |
| Every 50 hours | Replace spark plug, check drive belt tension |
| Every 100 hours | Change hydrostatic fluid, inspect PTO clutch |
| Seasonal | Sharpen/replace blades, lubricate all pivot points, store properly |
Procedures for maintaining the commercial OHV engine.
CAUTION! Always disconnect spark plug before servicing engine.
Maintenance of the cutting deck, blades, and belt.
Tip: Replace blades in sets for balanced cutting.
Service procedures for the hydrostatic transmission and drive components.
WARNING! Do not attempt to service sealed hydrostatic unit. Return to authorized dealer.
Troubleshooting and service of electrical components.
| Component | Test Procedure | Specification |
|---|---|---|
| Battery | Load test | 12V, minimum 200 CCA |
| Starter | Draw test | Less than 150 amps |
| Charging System | Voltage output | 13.5-14.5V at 3000 RPM |
| PTO Clutch | Resistance check | 2.5-3.5 ohms |
| Safety Switches | Continuity test | Closed when engaged |
Note: Always disconnect battery before servicing electrical system.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Engine won't start | Fuel, spark, compression | Check fuel level, spark plug, and compression. Verify safety switches. |
| Poor cutting performance | Dull blades, deck clogged | Sharpen/replace blades. Clean underside of deck. |
| Excessive vibration | Unbalanced blade, loose parts | Balance or replace blade. Tighten all bolts and fasteners. |
| Loss of power | Clogged air filter, old fuel | Clean/replace air filter. Drain and replace with fresh fuel. |
| Drive system slipping | Worn belt, low fluid | Inspect and replace drive belt. Check hydrostatic fluid level. |
| Uneven cut | Deck not level, tire pressure | Level cutting deck. Inflate tires to recommended pressure. |
Reset: Disconnect battery for 30 seconds to reset electrical system if needed.
Refer to official Toro parts diagrams for component identification and ordering.
Note: Always use genuine Toro replacement parts for optimal performance.
Toro Commercial 3-Year Limited Warranty. Registration required within 30 days of purchase.
For technical support, parts ordering, or warranty claims:
Service Centers: Authorized Toro service centers nationwide. Use dealer locator on website.