1. Introduction
This manual provides essential information for the safe and efficient operation, assembly, maintenance, and troubleshooting of your PowerSmart 21-Inch Gas Lawn Mower. This self-propelled mower features a 140CC B&S EX550 engine, a durable steel deck, and 3-in-1 functionality for bagging, mulching, and rear discharge. Please read this manual thoroughly before operating the machine.
Image 1.1: The PowerSmart 21-Inch Gas Lawn Mower, showcasing its design and a bottle of motor oil for initial setup.
2. Safety Information
Always prioritize safety when operating the lawn mower. Failure to follow these instructions may result in serious injury or property damage.
- Read the entire manual before operation.
- Wear appropriate personal protective equipment (PPE), including eye protection, hearing protection, and sturdy footwear.
- Keep hands and feet away from rotating parts.
- Do not operate the mower in wet grass or rain.
- Ensure the area is clear of debris, children, and pets before starting.
- Refuel in a well-ventilated area with the engine off and cool.
- Never leave a running mower unattended.
3. Assembly and Setup
Your PowerSmart lawn mower is designed for straightforward assembly. Follow these steps for initial setup:
- Handle Assembly: Attach the upper handle to the lower handle, ensuring all bolts are securely tightened.
- Grass Bag Assembly: Assemble the grass collection bag according to the instructions provided.
- Add Engine Oil: Before first use, add the recommended engine oil (SAE 30 or 10W-30) to the engine crankcase. Do not overfill.
- Add Fuel: Fill the fuel tank with fresh, unleaded gasoline. Do not use E85 or E15 fuel.
- Check Connections: Ensure all cables and connections are secure.
Image 3.1: Detail of the Briggs & Stratton engine, highlighting its robust construction and the 'Engine Made in the USA' emblem.
4. Operation
Operating your PowerSmart lawn mower is efficient and straightforward:
- Starting the Engine: Ensure the spark plug wire is connected. Prime the engine if necessary (refer to engine manual). Hold the operator presence control bar against the handle and pull the starter rope firmly. The B&S engine is designed for smooth start-up.
- Adjusting Cutting Height: The mower features a 6-position height adjustment lever, allowing you to set the cutting height from 1.5 inches to 3.9 inches. Adjust the height to suit your lawn conditions and desired grass length.
- 3-in-1 Functionality:
- Bagging: Attach the grass collection bag to collect clippings. The 1.4-bushel bag efficiently gathers cut grass. Empty the bag regularly to maintain performance and prevent it from detaching.
- Mulching: Insert the mulching plug (if applicable) to finely cut and redistribute grass clippings back onto the lawn as natural fertilizer.
- Rear Discharge: Remove the grass bag and mulching plug for direct rear discharge of clippings.
- Self-Propelled Drive: Engage the self-propelled lever to activate the rear-wheel drive system. The 10-inch large rear wheels provide excellent traction and maneuverability, especially on slopes or uneven terrain.
Image 4.1: Visual representation of the mower's versatile 3-in-1 capabilities: mulching, rear discharge, and rear bagging.
Image 4.2: A visual guide to the 6-position cutting height adjustment, ranging from 1.5 inches to 3.9 inches.
5. Maintenance
Regular maintenance ensures the longevity and optimal performance of your lawn mower:
- Engine Oil: Check oil level before each use. Change engine oil after the first 5 hours of operation, then every 25 hours or annually.
- Air Filter: Clean or replace the air filter regularly, especially in dusty conditions.
- Spark Plug: Inspect and clean the spark plug annually. Replace if necessary.
- Blade Maintenance: Inspect the cutting blade for sharpness and damage before each use. Sharpen or replace the blade as needed. A dull blade can lead to an uneven cut.
- Deck Cleaning: Clean the underside of the mower deck after each use to prevent grass buildup, which can affect cutting performance and lead to rust. The robust steel deck is designed for durability.
- Storage: For long-term storage, drain the fuel tank or use a fuel stabilizer. Clean the mower thoroughly and store in a dry, protected area.
Image 5.1: View of the mower's underside, emphasizing the strong steel deck construction and the cutting blade.
Image 5.2: A user demonstrating the emptying of the large capacity grass bag, an essential part of routine maintenance.
6. Troubleshooting
Refer to this section for common issues and their solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Engine does not start | No fuel, stale fuel, loose spark plug wire, clogged air filter, low oil. | Add fresh fuel, check spark plug connection, clean/replace air filter, add oil. |
| Uneven cut | Dull or bent blade, incorrect cutting height, uneven terrain. | Sharpen or replace blade, adjust cutting height, mow on level ground. |
| Self-propelled feature not working or slow | Drive belt issue, cable adjustment, worn drive components. | Inspect drive belt and connections. If issues persist, contact customer support. |
| Pull cord detaches from handle | Improper re-attachment or wear. | Re-attach the pull cord securely to the handle. Ensure the operator presence control bar is depressed when pulling. |
7. Specifications
Key technical specifications for your PowerSmart lawn mower:
| Specification | Detail |
|---|---|
| Brand | PowerSmart |
| Model Number | B8721S2 |
| Power Source | Gas Powered |
| Engine | 140CC B&S EX550 |
| Material | Alloy Steel (Deck) |
| Cutting Width | 21 Inches |
| Cutting Height Positions | 6 |
| Minimum Cutting Height | 1.5 Inches |
| Maximum Cutting Height | 3.9 Inches |
| Operation Mode | Self-Propelled |
| Product Dimensions (DxWxH) | 32.9"D x 16.5"W x 22.6"H |
| Item Weight | 69.9 pounds |
| UPC | 840432709832 |
8. Warranty and Support
PowerSmart is committed to providing reliable products and excellent customer service. For warranty information and support, please refer to the following:
- Product Protection Plans: Extended protection plans are available for purchase to cover your investment beyond the standard warranty. Options include 2-Year and 3-Year Protection Plans.
- Customer Support: For any questions, technical assistance, or warranty claims, please contact PowerSmart customer support.
- Email Support: You can reach our expert team for professional assistance by emailing support2@powersmartusa.com. Our team aims to provide assistance within 24 hours.
Image 8.1: The PowerSmart customer support team, ready to provide assistance.
