1. Увод
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. Важне информације о безбедности
Увек се придржавајте основних мера предострожности како бисте смањили ризик од пожара, струјног удара и телесних повреда. То укључује, али није ограничено на:
- Пре употребе уређаја прочитајте сва упутства.
- Носите одговарајућу личну заштитну опрему (ЛЗО), укључујући заштиту за очи, заштиту за слух и чврсту обућу.
- Држите децу и посматраче даље од подручја кошења.
- Никада не користите косилицу по влажним условима или на стрмим падинама.
- Ensure the battery is fully charged before use and removed during maintenance or storage.
- Inspect the mower for damage before each use. Do not operate if damaged.
3. Садржај пакета
Проверите да ли су све ставке присутне у пакету:
- SUNTEK 40V 21-Inch Cordless Electric Self-Propelled Lawn Mower
- 2 x 4.0 Ah литијум-јонске батерије
- Рапид Цхаргер
- Торба за сакупљање траве
- Бочни отвор за испуштање
- Мулцхинг Плуг
- Упутство за употребу
4. Подешавање
4.1 Склоп дршке
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 Инсталација батерије
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. Упутство за употребу
5.1 Покретање и заустављање косилице
To start, press and hold the safety button, then pull the bail lever towards the handle. To stop, release the bail lever.
5.2 Подешавање висине кошења
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.

Figure 3: Adjusting the cutting height using the lever.
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 ПаметноView 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 Званични видео производа
Video 1: An official video demonstrating the features and operation of the SUNTEK 21-inch lawn mower.
6. Одржавање
6.1 Чишћење
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 Нега сечива
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 Складиштење
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.
КСНУМКС. Решавање проблема
| Проблем | Могући узрок | Решење |
|---|---|---|
| Косилица се не покреће | Batteries not inserted correctly or discharged; Safety button/bail lever not engaged. | Ensure batteries are fully charged and properly seated. Engage safety button and pull bail lever simultaneously. |
| Лоше перформансе сечења | 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. |
| Прекомерне вибрације | Оштећена или неуравнотежена сечива; Лабаве компоненте. | Проверите да ли је сечиво оштећено и замените га ако је потребно. Проверите да ли су сви причвршћивачи чврсто затегнути. |
| 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. Спецификације
| Феатуре | Детаљ |
|---|---|
| Модел | СЛМ4521 |
| Извор напајања | Напаја се батеријама (40В) |
| Ширина сечења | 21 инча |
| Подешавање висине сечења | 7 Positions (1" to 2.95") |
| Тип мотора | Digi-Brushless Outrunner Motor |
| Брзина самоходног возила | 7 levels (0.4 to 0.7 m/s) |
| Тип батерије | Lithium-ion (2 x 4.0Ah included) |
| Димензије производа (ДкШкВ) | 42.5 cm x 25.2 cm x 21.1 cm |
| Посебне карактеристике | ПаметноView System, APP Compatible, Dual Battery Ports with Auto-Switch |
9. Гаранција и подршка
For warranty information, product registration, or technical support, please refer to the warranty card included with your product or visit the official SUNTEK webсајт. Сачувајте рачун као доказ о куповини за потребе гаранције.
Корисничка подршка: For assistance, please contact SUNTEK customer service through the contact information provided on the official webсајт или вашу документацију о куповини.