1. Introduction
This manual provides detailed instructions for the proper use, installation, and maintenance of the HPI Racing 87462 Shock Repair Kit. This kit is designed to restore the performance of 127-187mm shocks on HPI Baja series remote-controlled vehicles. Please read these instructions thoroughly before proceeding with any repair work to ensure correct assembly and optimal shock performance.
Figure 1: HPI Racing 87462 Shock Repair Kit. This image displays the various components included in the kit, such as O-rings, bladders, and other seals necessary for shock rebuilding.
2. Setup and Installation
2.1 Required Tools
- Small Phillips head screwdriver
- Hex wrenches (appropriate sizes for shock screws)
- Shock pliers (optional, but recommended)
- Clean cloth or paper towels
- Shock oil (appropriate weight for your vehicle)
- Grease (silicone-based for O-rings)
- Container for old shock oil
2.2 Disassembly of Existing Shocks
- Carefully remove the shocks from your vehicle.
- Unscrew the shock cap and drain the old shock oil into a waste container.
- Remove the shock shaft assembly, including the piston, from the shock body.
- Disassemble the shock shaft, removing the old O-rings, spacers, and seals from the lower shock cap.
- Clean all metal components thoroughly with a clean cloth. Inspect for any damage or wear beyond the seals.
2.3 Assembly with Repair Kit Components
- Apply a small amount of silicone grease to the new O-rings from the repair kit.
- Install the new O-rings and any necessary spacers into the lower shock cap. Ensure they are seated correctly.
- Carefully slide the shock shaft through the newly installed O-rings in the lower shock cap.
- Attach the piston to the shock shaft if it was removed.
- Insert the shock shaft assembly into the shock body.
- Fill the shock body with the appropriate weight of shock oil, leaving a small air gap at the top.
- Slowly move the shock shaft up and down to bleed any air bubbles from the oil. Repeat until no more bubbles appear.
- Install the new bladder (if included and applicable) into the shock cap.
- Carefully screw the shock cap onto the shock body, ensuring not to overtighten. Some oil may overflow; wipe it clean.
- Test the shock for smooth operation and proper damping.
- Reinstall the repaired shocks onto your vehicle.
3. Operating Considerations
Once the shocks are repaired and reinstalled, ensure they are functioning correctly before operating your RC vehicle at high speeds or in demanding conditions. Proper shock operation is crucial for vehicle handling and stability. Observe the vehicle's suspension travel and damping characteristics. If the vehicle exhibits inconsistent handling or excessive bouncing, re-check the shock assembly and oil levels.
4. Maintenance
Regular maintenance of your shocks will extend their lifespan and maintain optimal performance.
- Inspection: Periodically inspect shocks for oil leaks, bent shafts, or damaged components.
- Cleaning: After each use, especially in dirty or dusty conditions, clean the exterior of the shocks to prevent dirt from contaminating the seals.
- Oil Replacement: Shock oil degrades over time and use. It is recommended to replace shock oil and inspect seals every 10-15 hours of operation or as needed based on performance.
- Seal Replacement: The O-rings and bladders are wear items. Replace them with components from a new HPI Racing 87462 kit when signs of wear or leakage appear.
5. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Shock leaking oil | Damaged or worn O-rings/seals; improper assembly | Replace O-rings/seals; ensure proper seating during assembly. |
| Poor damping/bouncing | Low shock oil level; incorrect oil weight; air in shock | Refill with correct oil; bleed air thoroughly; consider heavier oil. |
| Shock feels stiff/sticky | O-rings too tight; dirt/debris in shock; bent shock shaft | Re-lubricate O-rings; clean internal components; replace bent shaft. |
6. Specifications
- Model Number: H87462
- Compatibility: HPI Baja 127-187mm Shocks
- Kit Contents: Various O-rings, bladders, and seals (exact contents may vary slightly by batch)
- Manufacturer: HPI RACING
- Item Weight: Approximately 2.2 ounces (kit components)
- Product Dimensions: Designed for specific shock sizes, not the kit packaging.
7. Warranty Information
HPI Racing products are manufactured to high standards. This repair kit is intended to replace wear items. For specific warranty details regarding manufacturing defects, please refer to the official HPI Racing website or contact their customer support directly. Wear and tear components are typically not covered under warranty.
8. Customer Support
If you encounter any issues or have questions regarding the HPI Racing 87462 Shock Repair Kit that are not covered in this manual, please visit the official HPI Racing website for FAQs, technical support, and contact information. You may also reach out to your authorized HPI Racing dealer for assistance.
Official Website: www.hpiracing.com