1. Introduction
Thank you for choosing the Mould King 18039 Technical Remote Control Bigfoot Monster Truck building block set. This manual provides essential information for the assembly, operation, and maintenance of your new model. Please read it carefully before beginning assembly to ensure a smooth and enjoyable building experience.
Safety Warnings
- WARNING: This product contains small parts and is not suitable for children under 3 years old due to choking hazards.
- WARNING: Do not eat the building blocks. Keep away from fire and high temperatures.
- Recommended Age: 14+ years. Adult supervision is recommended for younger builders.
- Ensure all electronic components are handled with care and installed correctly to prevent damage.
2. What's in the Box
Your Mould King 18039 set comes with all the necessary components to build and operate your Bigfoot Monster Truck. Please verify all parts are present upon opening the package.

Image: Assembled Bigfoot Monster Truck, its packaging, and included electronic components.
Included Components:
- Building blocks (1454+ pieces)
- 1x Servo Motor
- 2x Monster Motors
- 1x MK4.0 Battery Box (for Lithium Battery)
- 1x Remote Control
- Instruction Manual (physical copy included)

Image: Diagram illustrating the truck's dimensions and a visual list of the electronic components.
The instruction manual for building the model is packed together with the building blocks. Please refer to this detailed manual for step-by-step assembly.
3. Assembly Instructions
The Mould King 18039 Bigfoot Monster Truck is a complex building set designed for an engaging assembly experience. A comprehensive, step-by-step instruction manual is included in your package. Please follow it carefully.
General Assembly Guidance:
- Unpack and Organize: Carefully open the packaging and sort the building blocks by type or color as suggested in the included manual. This will significantly speed up the assembly process.
- Follow the Manual: Adhere strictly to the sequence and instructions provided in the dedicated assembly manual. Each step is designed to build upon the previous one.
- Electronic Components: Pay close attention when installing the Servo Motor, Monster Motors, and MK4.0 Battery Box. Ensure all connections are secure and correctly oriented as per the diagrams in the assembly manual.
- Test Functionality: Periodically test movable parts during assembly to ensure they are not stiff or incorrectly installed.
- Seek Assistance: If you encounter any difficulties, refer to the troubleshooting section or contact customer support.
4. Setup
Battery Installation (MK4.0 Battery Box)
The Bigfoot Monster Truck is powered by a Lithium Battery, housed within the MK4.0 Battery Box. Ensure the battery is fully charged before installation.
- Locate the MK4.0 Battery Box within your assembled model.
- Open the battery compartment cover.
- Insert the Lithium Battery, ensuring correct polarity (+/-).
- Securely close the battery compartment cover.
Remote Control Pairing
To operate your truck, you need to pair the remote control with the MK4.0 Battery Box.
- Ensure the battery box in the truck is powered on.
- Turn on the remote control.
- Follow the specific pairing instructions provided in the detailed assembly manual. Typically, this involves pressing a pairing button on both the battery box and the remote control until a successful connection is indicated (e.g., an LED light changes).
APP Operation Interface
The model also supports control via a dedicated mobile application. Refer to the assembly manual for instructions on downloading and connecting to the app. The app provides an alternative control interface and potentially additional functionalities.
5. Operating Instructions
Once assembled and powered, your Bigfoot Monster Truck is ready for operation using either the remote control or the mobile app.

Image: Key operational features including rear wheel suspension, telescopic steering, cockpit detail, and forward/steering controls.
Basic Controls:
- Forward/Backward: Use the designated controls on the remote or app to move the truck forward or backward.
- Steering: Use the steering controls to turn the truck left or right. The model features telescopic steering for precise control.
Key Features in Operation:
- Rear Wheel Suspension System: The truck is equipped with a rear wheel suspension system that snaps back when pressed, providing excellent shock absorption for off-road terrain.
- Telescopic Steering: This feature allows for responsive and accurate steering, enhancing the driving experience.
- Cockpit: The detailed cockpit adds to the realism of the model.

Image: The Bigfoot Monster Truck demonstrating its off-road capabilities in a desert setting.
Always operate the truck in a safe environment, away from obstacles, people, and pets. Avoid operating in wet conditions to protect electronic components.
6. Maintenance
Cleaning
- To clean the building blocks, use a soft, dry cloth. For stubborn dirt, a slightly damp cloth can be used, but ensure no water enters the electronic components.
- Do not use harsh chemicals or abrasive cleaners, as these can damage the plastic.
Storage
- Store the assembled model and any spare parts in a cool, dry place, away from direct sunlight and extreme temperatures.
- If storing for an extended period, remove the Lithium Battery from the MK4.0 Battery Box to prevent leakage or damage.
Battery Care
- Always use the recommended charger for the Lithium Battery.
- Do not overcharge or completely drain the battery.
- Dispose of old batteries responsibly according to local regulations.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Truck does not move. | Battery not installed or low charge. Incorrect motor connection. | Check battery installation and charge level. Verify motor connections as per manual. |
| Remote control not responding. | Remote not paired. Remote control batteries low. | Ensure remote is paired with the battery box. Replace remote control batteries. |
| Steering is stiff or unresponsive. | Servo motor incorrectly installed or blocked. Building blocks obstructing movement. | Check servo motor installation. Inspect for any misaligned or jammed blocks. |
| App connection issues. | Bluetooth/wireless interference. App not updated. | Ensure Bluetooth is enabled. Try restarting the app and truck. Check for app updates. |
8. Specifications

Image: Detailed parameter description table for the Mould King 18039.
| Feature | Detail |
|---|---|
| Brand | MOULD KING |
| Model Number | 18039 |
| Type | Building Blocks (Technical Car Toys) |
| Material | Plastic (ABS plastic material) |
| Block Size | Small building block (Compatible with Lego) |
| Is Electric | Yes (Lithium Battery powered) |
| Remote Control | Yes (Includes physical remote and APP interface) |
| Certification | CE |
| Gender | Unisex |
| Recommended Age | 14+ years, 18+ years |
| Warning | Do not eat, keep away from fire |
| Particle Count | 1454+ pcs |
| Assembled Dimensions (L x W x H) | 45.3 cm x 25.4 cm x 23.8 cm |
| Package Size (L x W x H) | 44 cm x 30 cm x 9.4 cm |

Image: Product packaging showing the package dimensions.
9. User Tips
- Organize Parts: Before starting assembly, sort the blocks into small containers or bags. This makes finding specific pieces much easier and reduces frustration.
- Double-Check Connections: For electronic components, ensure all wires are firmly connected and routed correctly to avoid short circuits or functional issues.
- Patience is Key: Building complex models takes time and patience. Don't rush the process; enjoy each step of the construction.
- Test Movement: After assembling sections with moving parts (like suspension or steering), gently test their range of motion to ensure they operate smoothly before proceeding.
- App Control: If using the app, ensure your device's operating system is up to date for optimal performance and compatibility.
10. Warranty and Support
MOULD KING is committed to providing high-quality products and customer satisfaction. If you encounter any issues with missing parts, defective components, or require technical assistance during assembly or operation, please contact the seller or MOULD KING customer support directly.
The product includes a 'Free Replacement Offer' for any missing or damaged parts. Please refer to the original purchase documentation or contact your retailer for details on how to claim replacements.
For further information or support, please refer to the contact details provided with your purchase or on the official MOULD KING website.