1. Wprowadzenie
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. Informacje dotyczące bezpieczeństwa
Always follow basic safety precautions to reduce the risk of fire, electric shock, and personal injury. This section outlines critical safety guidelines.
Ogólne zasady bezpieczeństwa
- Przed przystąpieniem do obsługi maszyny przeczytaj i zrozum wszystkie instrukcje.
- Trzymaj dzieci i zwierzęta z dala od obszaru koszenia.
- Należy nosić odpowiedni sprzęt ochrony osobistej (PPE), obejmujący ochronę oczu, ochronę słuchu i solidne obuwie.
- 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.
- Nie używaj kosiarki, gdy trawa jest mokra lub gdy pada deszcz.
- Always turn off the engine and disconnect the spark plug wire before cleaning, repairing, or inspecting the mower.
3. Instalacja i montaż
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 Adding Engine Oil and Fuel
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.
- Napełnij zbiornik paliwa świeżą, bezołowiową benzyną.

Image 3.1: Engine Detail. This image highlights the Briggs & Stratton 140cc engine, showing where to add oil and fuel.
3.3 Regulacja wysokości koszenia
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. Instrukcja obsługi
4.1 Uruchomienie silnika
The PowerSmart mower is equipped with an easy-pull recoil and auto choke system for convenient instant starting. No priming is required.
- Sprawdź, czy zbiornik paliwa jest pełny i czy poziom oleju jest prawidłowy.
- 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:
- Parcianka: Attach the grass collection bag to collect clippings for a clean lawn.
- Mulczowanie: 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.
- Wyrzut tylny: 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 Zatrzymywanie silnika
Release the engine control bar on the handle to stop the engine. The blade will stop rotating within a few seconds.
5. Konserwacja
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 Ogólne czyszczenie
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 Konserwacja silnika
- Wymiana oleju: Wymień olej silnikowy po pierwszych 5 godzinach pracy, a następnie co 25 godzin lub raz w roku.
- Filtr powietrza: Regularnie sprawdzaj i czyść filtr powietrza. Wymień go, jeśli jest uszkodzony lub nadmiernie zabrudzony.
- Świeca: Sprawdzaj świecę zapłonową co roku. W razie potrzeby wyczyść ją lub wymień.
5.3 Pielęgnacja ostrzy
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 Przechowywanie
For long-term storage, especially over winter, prepare the mower as follows:
- Opróżnij zbiornik paliwa lub dodaj stabilizator paliwa.
- Wymień olej silnikowy.
- Dokładnie wyczyść kosiarkę.
- Store in a dry, well-ventilated area. The handle can be folded for compact storage.
6. Rozwiązywanie Problemów
| Problem | Możliwa przyczyna | Rozwiązanie |
|---|---|---|
| Silnik nie uruchamia się | No fuel, old fuel, spark plug disconnected, low oil. | Add fresh fuel, check spark plug connection, ensure adequate oil level. |
| Kosiarka tnie nierównomiernie | Dull blade, incorrect cutting height setting, uneven terrain. | Sharpen or replace blade, adjust cutting height evenly, mow on level ground. |
| Nadmierne wibracje | Bent or unbalanced blade, loose engine bolts. | Inspect and replace blade if bent, tighten engine bolts. |
7. Specyfikacje
| Funkcja | Szczegół |
|---|---|
| Marka | PowerSmart |
| Numer modelu | B8721S2 |
| Silnik | 140cc B&S EX550 |
| Cutting Deck Width | 21 cali |
| Pozycje wysokości cięcia | 6 |
| Tryby pracy | 3-in-1 (Bagging, Mulching, Rear Discharge) |
| Typ napędu | Samojezdny |
| Tworzywo | Pokład ze stali stopowej |
| Waga przedmiotu | 33.11 kilograma |
| UPC | 840432709146 |
8. Gwarancja i wsparcie
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.
Adres e-mail obsługi klienta: 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.