1. Introduction and Product Overview
This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your Poulan Pro PRLM21i 58-Volt Cordless 21-inch 3-in-1 Push Lawn Mower. Please read this manual thoroughly before initial use and keep it for future reference.
The Poulan Pro PRLM21i is a battery-powered lawn mower designed for homeowners seeking a powerful, quiet, and environmentally friendly alternative to gas-powered models. It features a 21-inch steel cutting deck and offers 3-in-1 functionality: mulching, bagging, and side discharge.

Overall view of the Poulan Pro PRLM21i lawn mower with its grass collection bag.
Official product video demonstrating key features of the Poulan Pro PRLM21i lawn mower, including battery installation, height adjustment, and 3-in-1 capabilities.
2. Safety Instructions
Always follow basic safety precautions to reduce the risk of fire, electric shock, and personal injury when using this product.
- Read all instructions carefully before operating the mower.
- Wear appropriate personal protective equipment (PPE), including eye protection, hearing protection, and sturdy footwear.
- Keep children, pets, and bystanders away from the mowing area.
- Do not operate the mower in wet conditions or on steep slopes.
- Always remove the battery pack when cleaning, servicing, or storing the mower.
- Inspect the mower for damage before each use. Do not operate if damaged.
3. Setup and Assembly
Your lawn mower requires minimal assembly. Follow these steps for initial setup:
- Unpack Components: Carefully remove all parts from the packaging.
- Handle Assembly: Attach the upper handle to the lower handle, ensuring all bolts are securely tightened.
- Battery Charging: Fully charge the 58V Lithium-ion battery using the provided charger before first use. Refer to the charger's manual for detailed instructions.
- Battery Installation: Insert the charged battery into the battery compartment on the mower. Ensure it clicks securely into place.

Proper insertion of the 58V Lithium-ion battery into the mower's battery compartment.
4. Operating Instructions
4.1. Starting and Stopping
- To Start: Ensure the battery is installed. Press and hold the safety switch, then pull the bail lever towards the handle. The mower will start with an easy push-button action.
- To Stop: Release the bail lever. The motor will stop automatically.

Close-up of the control panel on the handle, showing the power meter and boost mode button.
4.2. Cutting Height Adjustment
The mower features 4 quick-adjust cutting height positions. To adjust, locate the height adjustment levers near the wheels. Pull the lever outwards and move it to the desired notch for your preferred cutting height. Ensure all wheels are set to the same height.

Detail of the quick-adjust height position lever on the mower wheel.
4.3. Mowing Modes (3-in-1 Functionality)
Your mower is capable of mulching, bagging, and side discharging grass clippings.
- Bagging: Attach the grass collection bag to the rear discharge opening. Ensure it is securely fastened.
- Mulching: Remove the grass collection bag and ensure the mulching plug is inserted into the rear discharge opening.
- Side Discharge: Remove the grass collection bag and mulching plug. Attach the side discharge chute to the side opening.
4.4. Mowing Tips
- For best results, avoid cutting more than one-third of the grass blade length at a time.
- Mow when the grass is dry.
- Overlap cutting swaths slightly to ensure even coverage.
- Utilize the exclusive power meter and boost mode for optimal performance in varying grass conditions.
5. Maintenance
Regular maintenance ensures the longevity and optimal performance of your lawn mower.
- Cleaning: After each use, clean the underside of the cutting deck to prevent grass buildup. Use a damp cloth to wipe down the exterior. Do not use a pressure washer.
- Blade Care: Periodically inspect the blade for sharpness and damage. A dull blade can tear grass, leading to an unhealthy lawn. Sharpen or replace the blade as needed. Always wear heavy-duty gloves when handling the blade.
- Battery Storage: Store the battery in a cool, dry place away from direct sunlight and extreme temperatures. For long-term storage, ensure the battery is partially charged (around 50%).
- General Storage: Store the mower in a dry, protected area. The handle can be folded for compact storage.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Mower does not start | Battery not fully charged or improperly installed; Safety switch/bail lever not engaged. | Ensure battery is fully charged and properly seated. Engage safety switch and pull bail lever. |
| Reduced cutting performance | Dull or damaged blade; Grass buildup under deck; Cutting height too low for grass conditions. | Sharpen or replace blade. Clean underside of deck. Adjust cutting height. |
| Mower stops during operation | Battery depleted; Overload protection activated (e.g., thick grass). | Recharge battery. Reduce mowing load by raising cutting height or taking smaller passes. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | Poulan Pro |
| Model Number | PRLM21i |
| Power Source | Battery Powered (58V Lithium Ion) |
| Cutting Width | 21 Inches |
| Cutting Height Positions | 4 |
| Operation Mode | Automatic |
| Item Weight | 65 Pounds |
| Product Dimensions | 64 x 23 x 32 inches |
| Wheel Size | 11 Inches (rear) |
| Material | Alloy Steel (deck) |
8. Warranty and Support
The Poulan Pro PRLM21i 58-Volt Cordless Lawn Mower comes with a 5-Year Limited Warranty. For warranty claims, technical support, or to purchase replacement parts, please contact Poulan Pro customer service. Refer to the product packaging or the official Poulan Pro website for the most current contact information.
For additional information and support, you may visit the official Poulan Pro Store online: Poulan Pro Store





