1. Introduktion
This manual provides essential information for the safe and efficient operation, maintenance, and troubleshooting of your PowerSmart 21-inch 140cc B&S Self-Propelled Lawn Mower. Please read this manual thoroughly before operating the mower and keep it for future reference.

Image 1.1: PowerSmart 21-inch Self-Propelled Lawn Mower. This image shows the mower's overall design, including the engine, handle, and grass collection bag.
2. Sikkerhedsoplysninger
Always follow basic safety precautions to reduce the risk of fire, electric shock, and personal injury. This section outlines critical safety guidelines.
Generelle sikkerhedsregler
- Læs og forstå alle instruktioner, før du betjener maskinen.
- Hold børn og kæledyr væk fra klippeområdet.
- Bær passende personlige værnemidler (PPE), herunder øjenbeskyttelse, høreværn og robust fodtøj.
- Never operate the mower when barefoot or wearing open sandals.
- Inspect the area where the mower is to be used and remove all objects that can be thrown by the blade.
- Brug ikke plæneklipperen i vådt græs eller regn.
- Always turn off the engine and disconnect the spark plug wire before cleaning, repairing, or inspecting the mower.
3. Opsætning og montering
3.1 Unpacking and Handle Assembly
Carefully remove the mower from its packaging. The handle typically comes folded for shipping. Unfold the handle and secure it using the provided knobs or levers. Ensure all cables are properly routed and not pinched.
3.2 Påfyldning af motorolie og brændstof
Before first use, add the recommended engine oil and fresh gasoline. Refer to the engine manual for specific oil type and capacity. Do not overfill.
- Locate the oil fill cap/dipstick and add the correct amount of 10W-30 engine oil.
- Fyld brændstoftanken med frisk, blyfri benzin.

Image 3.1: Engine Detail. This image highlights the Briggs & Stratton 140cc engine, showing where to add oil and fuel.
3.3 Justering af klippehøjde
This mower features 6 height settings to customize your cut. Adjust the cutting height by moving the lever on each wheel assembly to the desired position. Ensure all wheels are set to the same height.

Image 3.2: Height Adjustment. This image illustrates the lever used to adjust the cutting height, with indicators for different settings.
4. Betjeningsvejledning
4.1 Start af motoren
The PowerSmart mower is equipped with an easy-pull recoil and auto choke system for convenient instant starting. No priming is required.
- Sørg for, at brændstoftanken er fyldt, og at oliestanden er korrekt.
- Stand behind the mower and firmly grasp the handle.
- Pull the starter cord with a quick, continuous motion until the engine starts.
4.2 Using the Self-Propel Feature
The self-propel function assists in moving the mower forward, reducing operator effort. Engage the self-propel lever on the handle to activate the drive system. Release the lever to disengage.
4.3 3-in-1 Versatility: Mulching, Bagging, and Rear Discharge
Your mower offers three cutting options:
- Poseindpakning: Attach the grass collection bag to collect clippings for a clean lawn.
- Mulching: Remove the grass bag and ensure the mulching plug is in place (if applicable) to finely shred clippings and return them to the lawn as fertilizer.
- Bagudkast: Remove the grass bag and mulching plug (if applicable) to allow clippings to be discharged from the rear of the mower.

Image 4.1: 3-in-1 Functionality. This image visually explains the mulching, rear discharge, and rear bagging options.
4.4 Standsning af motoren
Release the engine control bar on the handle to stop the engine. The blade will stop rotating within a few seconds.
5. Vedligeholdelse
Regular maintenance ensures optimal performance and extends the life of your lawn mower. Always disconnect the spark plug wire before performing any maintenance.
5.1 Generel rengøring
After each use, clean grass clippings and debris from the mower deck, wheels, and engine cooling fins. Use a brush or cloth. Avoid using high-pressure water directly on the engine.
5.2 Motorvedligeholdelse
- Olieskift: Skift motorolien efter de første 5 timers drift, derefter hver 25. time eller årligt.
- Luftfilter: Inspicer og rengør luftfilteret regelmæssigt. Udskift det, hvis det er beskadiget eller meget snavset.
- Tændrør: Inspect the spark plug annually. Clean or replace as needed.
5.3 Pleje af blade
Regularly inspect the cutting blade for sharpness and damage. A dull blade tears grass, leading to an unhealthy lawn. Sharpen or replace the blade as necessary. Always wear heavy gloves when handling the blade.

Image 5.1: Cutting Blade. This image provides a view of the mower's underside, highlighting the cutting blade and the robust steel deck construction.
5.4 Opbevaring
For long-term storage, especially over winter, prepare the mower as follows:
- Tøm brændstoftanken, eller tilsæt en brændstofstabilisator.
- Skift motorolien.
- Rengør plæneklipperen grundigt.
- Store in a dry, well-ventilated area. The handle can be folded for compact storage.
6. Fejlfinding
| Problem | Mulig årsag | Løsning |
|---|---|---|
| Motoren starter ikke | No fuel, old fuel, spark plug disconnected, low oil. | Add fresh fuel, check spark plug connection, ensure adequate oil level. |
| Plæneklipperen skærer ujævnt | Dull blade, incorrect cutting height setting, uneven terrain. | Sharpen or replace blade, adjust cutting height evenly, mow on level ground. |
| Overdreven vibration | Bent or unbalanced blade, loose engine bolts. | Inspect and replace blade if bent, tighten engine bolts. |
7. Specifikationer
| Feature | Detalje |
|---|---|
| Mærke | PowerSmart |
| Modelnummer | B8721S2 |
| Motor | 140cc B&S EX550 |
| Cutting Deck Width | 21 tommer |
| Klippehøjdepositioner | 6 |
| Driftstilstande | 3-in-1 (Bagging, Mulching, Rear Discharge) |
| Drevtype | Selvkørende |
| Materiale | Alloy Steel Deck |
| Varens vægt | 33.11 kilo |
| UPC | 840432709146 |
8. Garanti og support
PowerSmart products are designed for durability and performance. For warranty information, please refer to the separate warranty card included with your purchase or visit the official PowerSmart website. For technical assistance or parts, contact PowerSmart customer service.
Kundeservice email: support2@powersmartusa.com
PowerSmart has over 500 certified repair centers in the U.S. and provides full replacement parts through its IL headquarters.

Image 8.1: PowerSmart Customer Support. This image shows the PowerSmart support team and contact information.