1. Introducció
Thank you for choosing the SUNTEK 40V 21-Inch Cordless Electric Self-Propelled Lawn Mower. This manual provides essential information for the safe operation, assembly, maintenance, and troubleshooting of your new lawn mower. Please read this manual thoroughly before first use and keep it for future reference.

Figure 1: SUNTEK 40V 21-Inch Cordless Electric Self-Propelled Lawn Mower.
2. Informació important de seguretat
Always follow basic safety precautions to reduce the risk of fire, electric shock, and personal injury. This includes, but is not limited to:
- Llegiu totes les instruccions abans d’utilitzar l’aparell.
- Utilitzeu equips de protecció individual (EPI) adequats, incloent-hi protecció ocular, protecció auditiva i calçat resistent.
- Mantingueu els nens i els vianants allunyats de la zona de sega.
- No utilitzeu mai la segadora en condicions humides ni en pendents pronunciats.
- Ensure the battery is fully charged before use and removed during maintenance or storage.
- Inspeccioneu la tallagespa per detectar danys abans de cada ús. No la feu funcionar si està danyada.
3. Contingut del paquet
Verifiqueu que tots els elements siguin presents al paquet:
- SUNTEK 40V 21-Inch Cordless Electric Self-Propelled Lawn Mower
- 2 bateries de liti-ió de 4.0 Ah
- Carregador ràpid
- Bossa de recollida d'herba
- Canal de descàrrega lateral
- Endoll de mulching
- Manual d'instruccions
4. Configuració
Muntatge de 4.1 nanses
Unfold the handle and secure it in place using the quick-release levers. Ensure the handle is firmly locked before operation. The telescopic handle allows for height adjustment for user comfort.
4.2 Instal·lació de la bateria
Open the battery compartment cover. Insert two fully charged 40V 4.0Ah lithium-ion batteries into the dual battery ports. The mower features automatic switchover functionality between batteries.

Figure 2: Dual battery ports with auto-switch technology for extended runtime.
4.3 Grass Collection Bag / Mulching Plug / Side Discharge Chute
Depending on your preference, attach the grass collection bag, insert the mulching plug, or install the side discharge chute. Refer to the diagrams in the full manual for detailed instructions on each attachment.
5. Instruccions de funcionament
5.1 Arrencada i aturada de la tallagespa
To start, press and hold the safety button, then pull the bail lever towards the handle. To stop, release the bail lever.
5.2 Ajust de l'alçada de tall
The mower offers 7-position height adjustment from 1" to 2.95". Use the single-point height adjustment lever located near the rear wheel to select your desired cutting height.

Figura 3: Ajust de l'alçada de tall amb la palanca.
5.3 Self-Propulsion Feature
Engage the self-propulsion lever to activate automatic forward movement. Adjust the speed using the handle-controlled speed adjustment, offering seven levels from 0.4 to 0.7 meters per second.
5.4 intel·ligentView System and Mowing Modes
The integrated SmartView system displays real-time status, including battery level, cutting height selected, and potential errors. Select from three speed working modes: ECO, POWER, and Smart, to optimize performance for different grass conditions.

Figure 4: The SmartView display provides real-time operational information.
5.5 Smart Charging App
Download the SUNTEK LIVING app to monitor battery charging status, manage battery lifecycle, and set charging schedules remotely.

Figure 5: Monitor and manage your battery with the SUNTEK LIVING app.
5.6 Vídeo oficial del producte
Video 1: An official video demonstrating the features and operation of the SUNTEK 21-inch lawn mower.
6. Manteniment
6.1 Neteja
After each use, disconnect the batteries and clean the mower deck and blade area. Remove any grass clippings or debris using a brush or cloth. Do not use water directly on electrical components.
6.2 Cura de la fulla
Regularly inspect the blade for sharpness and damage. A dull or damaged blade can affect cutting performance and mower efficiency. Replace the blade if it is bent, cracked, or excessively worn. Always wear heavy-duty gloves when handling the blade.
6.3 Emmagatzematge
For compact storage, fold the handle down. The grass bag can be used to cover the exposed blade for safety. Store the mower in a dry, secure location away from children and pets. Remove batteries before long-term storage.

Figure 6: The mower features a compact and safe storage design.
7. Solució De Problemes
| Problema | Causa possible | Solució |
|---|---|---|
| La segadora no arrenca | Piles no inserides correctament o descarregades; botó/palanca de seguretat no activat. | Assegureu-vos que les bateries estiguin completament carregades i correctament col·locades. Activeu el botó de seguretat i estireu la palanca de fixació simultàniament. |
| Mal rendiment de tall | Dull or damaged blade; Cutting height too low for grass conditions; Overgrown grass. | Sharpen or replace blade. Adjust cutting height. Mow frequently or take smaller passes. |
| Vibració excessiva | Fulla danyada o desequilibrada; components solts. | Inspect blade for damage and replace if necessary. Check all fasteners for tightness. |
| Self-propulsion not working | Self-propulsion lever not engaged; Motor issue. | Ensure the self-propulsion lever is fully engaged. Check SmartView for error codes. |
8. Especificacions
| Característica | Detall |
|---|---|
| Model | SLM4521 |
| Font d'alimentació | Funciona amb bateria (40 V) |
| Amplada de tall | 21 polzades |
| Ajust d'alçada de tall | 7 posicions (1" a 2.95") |
| Tipus de motor | Digi-Brushless Outrunner Motor |
| Velocitat autopropulsada | 7 levels (0.4 to 0.7 m/s) |
| Tipus de bateria | Lithium-ion (2 x 4.0Ah included) |
| Dimensions del producte (PxWxH) | 42.5" x 25.2" x 21.1" |
| Característiques especials | Intel·ligentView System, APP Compatible, Dual Battery Ports with Auto-Switch |
9. Garantia i Suport
For warranty information, product registration, or technical support, please refer to the warranty card included with your product or visit the official SUNTEK weblloc web. Conserveu el rebut de compra com a comprovant de compra per a reclamacions de garantia.
Atenció al client: For assistance, please contact SUNTEK customer service through the contact information provided on the official weblloc web o la documentació de la compra.