Craftsman 21 HP Riding Lawn Mower Manual

The Craftsman 21 HP Riding Lawn Mower is a powerful and efficient lawn care machine featuring a 21-horsepower engine, hydrostatic transmission, 46-inch cutting deck, electric start, adjustable cutting height, mulching capability, and comfortable high-back seat. Designed for residential use on medium to large lawns. Below are key sections for safety, features, assembly, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 21 HP Briggs & Stratton engine, Hydrostatic transmission, 46-inch triple-blade cutting deck, Electric start with key, Adjustable seat, Mulching kit included, Headlights, Cup holder.

Assembly Instructions

Unpack and inspect all parts. Assembly requires basic tools.

1. Install steering wheel: Align and tighten bolt.
2. Attach seat: Mount using provided bolts and washers.
3. Install battery: Connect red (+) then black (-) terminals.
4. Attach cutting deck: Align with mounting points and secure with pins.
5. Install mulching kit (if included): Attach baffle and plug.
6. Check tire pressure: Inflate to 10 PSI (front) and 12 PSI (rear).

WARNING! Mower is heavy; use assistance. Ensure all bolts are tightened securely.

First-Time Setup

Before first use, complete these steps.

1. Add engine oil: Use SAE 30 (approx. 2 quarts) to full mark on dipstick.
2. Fill fuel tank: Use fresh unleaded gasoline (87 octane or higher).
3. Charge battery: Connect charger for 12 hours before first start.
4. Adjust seat: Position for comfortable reach to pedals and controls.
5. Set cutting height: Use deck lift lever to desired position.
6. Test operation: Start engine in open area, engage blades briefly.

CAUTION! Never add fuel while engine is hot. Allow to cool completely.

Specifications

• Engine: 21 HP Briggs & Stratton Intek OHV.
• Transmission: Hydrostatic, infinite speeds.
• Cutting Deck: 46-inch stamped steel, triple blade.
• Cutting Height Range: 1.5 to 4 inches (7 positions).
• Fuel Capacity: 2.5 gallons.
• Oil Capacity: 2 quarts (SAE 30).
• Battery: 12V, 230 CCA.
• Weight: 500 lbs (approx.).
• Warranty: 2-year limited.

Controls and Operation

Dashboard: Ignition key, PTO (blade engage) switch, Throttle, Choke, Headlight switch.

Pedals & Levers: Drive pedal (forward/reverse), Brake pedal, Parking brake lever, Deck lift lever, Height adjustment knob.

Starting Procedure: 1. Sit on seat. 2. Set parking brake. 3. Move throttle to FAST. 4. Turn key to START. 5. Once running, release key. Stopping: 1. Disengage PTO. 2. Move throttle to SLOW. 3. Engage brake. 4. Turn key to OFF. 5. Set parking brake.

Cutting Deck & Blades

Deck engagement via electric PTO switch. Always disengage when not cutting.

1. Blade removal: Disconnect spark plug, tilt deck, remove retaining bolt.
2. Blade sharpening: Use file or grinder to maintain sharp edge.
3. Deck cleaning: Remove grass buildup after each use.
4. Belt inspection: Check for cracks/wear every 25 hours.

Tip: Sharpen blades every 25 hours for optimal cut.

Maintenance Schedule

Regular maintenance ensures longevity and performance.

1. After each use: Clean deck, check for debris.
2. Every 8 hours: Check tire pressure, inspect blades.
3. Every 25 hours: Change oil, sharpen blades, check belts.
4. Every 50 hours: Replace air filter, check spark plug.
5. Every 100 hours: Change transmission fluid, inspect battery.
6. Seasonally: Lubricate pivot points, check tire wear.

WARNING! Always disconnect spark plug before performing maintenance.

Storage & Winterization

Prepare mower for long-term storage (especially winter).

1. Add fuel stabilizer: Run engine for 5 minutes to circulate.
2. Change oil: Replace with fresh oil before storage.
3. Remove battery: Store in cool, dry place on trickle charger.
4. Clean thoroughly: Remove all grass, dirt, and debris.
5. Cover: Use breathable cover to protect from elements.

CAUTION! Store in dry, well-ventilated area away from open flames.

Safety Information

Read and follow all safety instructions in manual.

• Always wear eye protection and sturdy shoes.
• Never carry passengers.
• Keep hands and feet away from moving parts.
• Clear mowing area of debris before starting.
• Do not mow on slopes greater than 15 degrees.
• Disengage blades when crossing driveways or gravel.
• Never leave mower unattended with engine running.

Warranty & Support

2-year limited warranty for residential use. Proof of purchase required. Warranty covers defects in materials/workmanship. Does not cover normal wear, misuse, or lack of maintenance. For support, contact Craftsman Customer Service at 1-888-331-4569 or visit www.craftsman.com.

Troubleshooting

Reset: Turn key to OFF, wait 30 seconds, restart.

Service: 1-888-331-4569; www.craftsman.com