Introduction
This manual provides instructions for the installation and maintenance of the SERBNOPG 4pcs Metal Drive Shaft CVD and Wheel Hex Upgrade Kit. This kit is designed to enhance the performance and durability of compatible HAIBOXING HBX 1/18 scale remote control cars, specifically models 18856, 18857, 18858, and 18859.
Please read these instructions carefully before proceeding with installation to ensure proper fitment and function.
Package Contents
Verify that all components listed below are present in your package:
- 4 x Metal Drive Shaft (CVD)
- 4 x Wheel Hex Adapter
- 4 x Pin
- 4 x Nut

Figure 1: Overview of the SERBNOPG Metal Drive Shaft CVD and Wheel Hex Upgrade Kit components.
Setup and Installation
This section outlines the steps required to install the metal drive shafts and wheel hex adapters onto your HAIBOXING HBX 1/18 RC car.
- Preparation: Ensure your RC car is powered off and the battery is disconnected. Place the car on a stable, clean surface.
- Remove Wheels: Carefully remove the wheels from your RC car. This typically involves unscrewing a nut or pin securing the wheel to the axle.
- Remove Existing Hex Adapters and Drive Shafts: Identify and remove the existing plastic wheel hex adapters and drive shafts. Note their orientation for reference.
- Install New Drive Shafts (CVD): Insert the new metal drive shafts into the differential output cups. Ensure the ball end of the CVD is securely seated.
- Install Pins: Place one of the small pins through the hole in the axle end of the new drive shaft. This pin will secure the wheel hex adapter.
- Install Wheel Hex Adapters: Slide a new metal wheel hex adapter onto the axle, aligning its slot with the pin. Ensure it fits snugly.
- Secure with Nuts: Place a nut onto the threaded end of the drive shaft and tighten it to secure the wheel hex adapter. Do not overtighten.
- Reattach Wheels: Mount your RC car wheels onto the new hex adapters and secure them.
- Repeat for all four wheels.

Figure 2: Detailed view of the drive shafts and hex adapters, illustrating their design for smooth transmission.

Figure 3: A single metal drive shaft (CVD) component.
Operating Considerations
Once installed, these metal upgrade parts are designed to provide improved durability and smoother power transmission compared to standard plastic components. No specific operational changes are required for the RC car itself, but users may notice enhanced performance, especially during demanding driving conditions.
- Initial Check: After installation, manually rotate each wheel to ensure smooth movement and no binding.
- First Run: Conduct a short, low-speed test run to confirm proper function of the new components before engaging in high-speed or aggressive driving.
Maintenance
Regular maintenance of your RC car's drivetrain components, including these upgrade parts, will ensure longevity and optimal performance.
- Cleaning: After each use, especially in dusty or dirty environments, clean the drive shafts and hex adapters to remove debris. A soft brush and compressed air can be effective.
- Lubrication: Periodically apply a small amount of RC-specific grease or lubricant to the CVD joints to reduce friction and wear. Avoid excessive lubrication, which can attract dirt.
- Inspection: Regularly inspect the drive shafts, pins, and hex adapters for signs of wear, bending, or damage. Replace any damaged components promptly to prevent further issues.
- Tightness Check: Ensure all nuts and screws securing the wheels and hex adapters remain tight. Loose components can lead to premature wear or failure.
Troubleshooting
If you encounter issues after installing the upgrade kit, consider the following:
| Problem | Possible Cause | Solution |
|---|---|---|
| Wheel binding or stiff rotation | Overtightened nuts, misaligned hex adapter, debris in CVD joint. | Loosen nuts slightly, re-seat hex adapter, clean and lubricate CVD joint. |
| Wheel wobble | Loose wheel nut, bent drive shaft, damaged hex adapter. | Tighten wheel nut, inspect and replace bent drive shaft or damaged hex adapter. |
| Clicking or grinding noise from drivetrain | Insufficient lubrication, damaged CVD joint, debris. | Clean and lubricate CVD joints, inspect for damage and replace if necessary. |
Specifications
- Material: Metal
- Quantity: 4pcs Drive Shaft, 4pcs Wheel Hex Adapter, 4pcs Pin, 4pcs Nut
- Color: Silver
- Compatibility: HAIBOXING HBX 18856, 18857, 18858, 18859 1/18 RC Cars
- Item Weight: Approximately 5.3 ounces (total package)
- Package Dimensions: Approximately 1.18 x 0.79 x 0.39 inches
Warranty and Support
Information regarding warranty coverage for this product is not explicitly provided in the product details. For any inquiries regarding product defects or operational assistance, please contact the seller directly through the platform where the purchase was made.
The manufacturer, caoxv, and brand, SERBNOPG, are committed to providing support for their products. Please refer to your purchase documentation or the seller's contact information for assistance.

