1. Introduction
This manual provides detailed instructions for the assembly and operation of your wishiot 4WD RC Car Chassis Electric Drive Climbing Car. This is a DIY kit designed for enthusiasts to build a robust off-road vehicle with advanced control features. Please read all instructions carefully before beginning assembly.
For a complete visual guide, a PDF building diagram is available. Please contact the seller to obtain it. You can also find the PDF manual at: User manual (PDF)
2. Package Contents
The following components are included in the Full Car Set bundle. Please verify all parts are present before starting assembly.
- Car Chassis Bricks Set x 1
- Black Wheel x 4
- XL Motor x 2
- Servo Motor x 1
- 8CH APP Remote Control Set x 1
Other bundles may include a subset of these components, such as only the Car Chassis, Black Wheels, Green Wheels, or specific Power Sets (Power 1 with IR Remote Control and Receiver, or Power 2 with 8CH APP Remote Control Set).


3. Assembly Instructions
This kit requires self-assembly. Please pay close attention to the small parts and follow the steps carefully. The PDF manual provides detailed diagrams for each step.
3.1 General Assembly Notes
- A standard Lego unit is 8mm. A 'No. 2' part is 16mm, a 'No. 5' part is 40mm, and so on. Use this as a reference for part identification.
- Ensure all connections are secure but do not force parts.
3.2 Key Assembly Steps (Refer to PDF for full details)
- Chassis Base Construction: Begin by assembling the main chassis frame using the larger beam elements and connectors.
- Gearbox and Differential Assembly: This is a critical step. Ensure the beige 20-tooth double-bevel wheel and the dark gray differential large gear are assembled on the same side. Incorrect placement will affect the drive system.
- Suspension System: Attach the suspension components, including shocks and linkages, to allow for flexible movement.
- Motor Integration: Install the XL motors and servo motor into their designated positions within the chassis.
- Wheel Assembly: Attach the wheels to the axles. The wheels are 107x44mm.



4. Power System Connection
4.1 Motor Connections
- Connect the two XL motors together.
- Connect the servo motor and LED light connector (if applicable) together.
- Connect the combined motor cables to the receiver unit.






4.2 Receiver Unit
The receiver unit features:
- Output power adjustment knob: Screwed to both sides for maximum power.
- Switch Indicator Lights: Provide status feedback.
- Square Pushbutton Switches: For various functions.
- Charging Port: For recharging the battery.
- Charging Indicator: Shows charging status.
The receiver connector should be pressed onto the rechargeable cone battery.

4.3 Remote Control Battery Installation
Unscrew the Phillips screws on the back cover of the remote control and install 3 x 7 batteries. Ensure the gear keys are in the same position. Pay attention to the positive and negative terminals; battery voltage should be less than 1.5 volts.

5. Operating Instructions
Your RC car chassis supports dual control mode: via remote control and via a mobile application.
5.1 Initial Power-Up
After completing assembly and connecting the power system, ensure all connections are secure. Turn on the receiver unit and then the remote control (or connect via the mobile app).
5.2 Basic Controls
- Use the joysticks/controls on the remote or app to move the car forward, backward, and steer left or right.
- Familiarize yourself with the controls in an open, safe area.
6. Maintenance
- Cleaning: Regularly clean the chassis and wheels to remove dust and debris, especially after off-road use. Use a soft brush or cloth.
- Connection Check: Periodically inspect all electrical and mechanical connections to ensure they are tight and free from damage.
- Battery Care: Always use the recommended batteries. Recharge rechargeable batteries as per manufacturer guidelines and store them in a cool, dry place when not in use. Remove batteries if the car will not be used for an extended period.
7. Troubleshooting
- Car Not Moving: Check battery levels in both the car's power unit and the remote control. Ensure all motor and receiver connections are secure. Verify the power switch on the receiver is ON.
- Erratic Movement/Steering: Check for any obstructions in the wheels or steering mechanism. Ensure the servo motor is correctly installed and connected.
- Remote Control Not Responding: Check remote control batteries. Ensure the remote control and receiver are properly paired (refer to the specific instructions for your 8CH APP Remote Control Set or IR Remote Control).
8. Specifications
| Feature | Detail |
|---|---|
| Brand Name | wishiot |
| Model Number | T0774 T0717 T0734 |
| Recommend Age | 14+y |
| Origin | Mainland China |
| Compatibility | for MOC Power Functions |
| Is Electric | No Battery (Kit for electric drive, power components sold separately or in bundles) |
| Package Length | 15 cm |
| Package Width | 5 cm |
| Package Height | 10 cm |
| Package Weight | 1.2 kg |
9. User Tips
- Manual Availability: Several users have noted the importance of the assembly manual. Remember to request the PDF building diagram from the seller if it was not included in your package. It is crucial for successful assembly.
- Gear Assembly: Double-check the assembly of the beige 20-tooth double-bevel wheel and the dark gray differential large gear. They must be on the same side for proper function.
- Pre-Operation Check: Always perform a quick check to ensure the assembly is correct and all connections are secure before energizing and operating the car.
10. Support
If you encounter any issues during assembly or operation, or if you require further assistance, please contact the wishiot Official Store directly through the platform where you made your purchase. Provide your order details and a clear description of the problem for prompt support.