Introduction
This manual provides detailed instructions for assembling and understanding the features of your stemedu MOC 4WD Four-wheel Drive Independent Suspension Differential Chassis. Designed for enthusiasts aged 14 and above, this building block set allows you to construct a functional chassis with advanced mechanical features, compatible with other major building block brands.
Safety Information
- This product contains small parts and is recommended for ages 14 and up. Keep out of reach of younger children to prevent choking hazards.
- Always assemble on a clean, flat surface to prevent loss of small components.
- Do not force pieces together; if parts do not fit easily, recheck the instructions.
- Keep building blocks away from extreme heat or direct sunlight to prevent deformation.
⚠ WARNING: This product can expose you to chemicals including phthalates (DEHP), which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Package Contents
The contents of your package may vary based on the specific product option purchased (e.g., "Just Bricks", "Just 4PCS Wheel", or "Bricks w 4PCS Wheel"). Please verify your package against the option selected.
- Building block components for the chassis frame, suspension, differentials, and steering axle.
- (If purchased with wheels) 4PCS Wheels.
Setup: Assembly Instructions
Follow these steps carefully to assemble your 4WD Independent Suspension Differential Chassis. Refer to the images for visual guidance.
Chassis Frame Assembly
Begin by constructing the main chassis frame. Identify the long beams and connectors that form the central structure. Ensure all connections are firm.
Figure 3: Top view of the chassis frame, showing the main structural components. Independent Suspension Units
Assemble the four independent suspension units. Each unit consists of control arms, shock absorbers (represented by red and grey elements), and pivot points. Pay close attention to the orientation of the suspension arms and the placement of the shock absorbers for proper function.
Figure 4: Detail of the front independent suspension assembly. 
Figure 5: Detail of the rear independent suspension assembly. Differential and Drivetrain Integration
Install the differential gears into both the front and rear axle housings. Connect the drive shafts and ensure the gears mesh smoothly. These differentials are crucial for allowing wheels to rotate at different speeds during turns, enhancing maneuverability.
Figure 6: Bottom view illustrating the placement of the differential gears within the chassis. Steering Axle Assembly
For the front axle, assemble the steering mechanism. This typically involves a rack-and-pinion or similar linkage system that allows the front wheels to turn. Connect the steering components to the front suspension units and ensure free movement.
Figure 7: Close-up of the front steering and suspension components. Final Assembly and Wheel Attachment
Attach the assembled suspension and axle units to the main chassis frame. Ensure all pins and connectors are securely fastened. Finally, mount the four wheels onto the axle hubs. Verify that all wheels spin freely and the suspension articulates correctly.
Figure 8: The completed chassis with wheels, ready for integration into a larger model.
Operating Principles
This chassis incorporates several advanced mechanical features:
- 4WD (Four-Wheel Drive): Power is distributed to all four wheels, providing enhanced traction and control, especially on uneven surfaces or when navigating obstacles.
- Independent Suspension: Each wheel can move vertically independently of the others. This allows the chassis to maintain better contact with the ground over bumps and uneven terrain, improving stability and handling.
- Differential Gears: Located in both front and rear axles, differentials allow the wheels on the same axle to rotate at different speeds. This is crucial for smooth turning, as the outer wheel needs to travel a greater distance than the inner wheel.
- Steering Axle: The front axle is designed with a steering mechanism, enabling directional control of the chassis.
Understanding these principles will help you appreciate the engineering behind your building block model and inspire further modifications or creations.
Maintenance
- Cleaning: To clean the building blocks, wipe them with a soft, damp cloth. Avoid harsh chemicals or abrasive cleaners. For stubborn dirt, a mild soap solution can be used, followed by thorough rinsing and air drying.
- Storage: Store the assembled chassis or individual blocks in a cool, dry place away from direct sunlight and extreme temperatures. This prevents material degradation and color fading.
- Inspection: Periodically inspect the chassis for any loose connections or worn parts. Re-fasten any loose pins or re-assemble sections as needed to maintain structural integrity and functionality.
Troubleshooting
- Missing Parts: If you find any parts missing from your package, please contact stemedu customer support with your purchase details.
- Loose Connections: If parts feel loose after assembly, gently press them together until they click firmly into place. Ensure pins are fully inserted.
- Difficulty in Movement/Steering: Check all gear alignments within the differentials and steering mechanism. Ensure no parts are binding or rubbing excessively. Verify that suspension components move freely without obstruction.
- Wheels Not Turning Smoothly: Ensure the wheels are correctly mounted on the axles and that no debris is caught in the wheel hubs or between the tires and chassis.
Specifications
| Feature | Detail |
|---|---|
| Brand Name | stemedu |
| Material | Plastic |
| Block Size | Small building block (Compatible with Lego) |
| Recommend Age | 14+ years |
| Origin | Mainland China |
| Is Electric | No Battery (Non-electric) |
| High-concerned chemical | None |
| Package Dimensions (Approx.) | 30 cm (Length) x 25 cm (Width) x 4 cm (Height) |
| Package Weight (Approx.) | 0.25 kg |
| Wheel Dimensions (Approx.) | 75.1 mm (Diameter) x 28 mm (Width) |
User Tips
- Organize Parts: Before starting assembly, sort all building blocks by type and color. This will significantly speed up the building process.
- Follow Instructions Carefully: Building complex MOCs requires precision. Double-check each step to ensure correct part placement and orientation.
- Test Functionality: As you build, periodically test the movement of the suspension, steering, and differentials to catch any errors early.
- Customization: This chassis provides a robust foundation for your own custom vehicle designs. Experiment with different bodywork or additional features.
Support Information
For any questions, concerns, or assistance with your stemedu MOC 4WD Independent Suspension Differential Chassis, please contact the seller or manufacturer directly.
- Brand: stemedu
- Seller: stemedu Official Store
- Product Quality: This product is designed for quality and durability.
- Returns: Refer to your purchase platform's return policy for details on free returns within 90 days, if applicable.
