QA1 TD902 Double Adjustable Stocker Shock Instruction Manual

Introduction

This manual provides comprehensive instructions for the installation, operation, maintenance, and troubleshooting of your QA1 TD902 Double Adjustable Stocker Shock. This shock absorber is designed for specific automotive applications, including the Chevrolet Bel Air, to enhance vehicle performance and handling. Please read this manual thoroughly before proceeding with installation or adjustments to ensure proper function and safety.

Important Safety Information

WARNING: Improper installation or adjustment of suspension components can lead to serious injury or death. Always wear appropriate personal protective equipment, including eye protection. If you are not confident in your ability to safely install or adjust this product, seek assistance from a qualified professional.

• Ensure the vehicle is securely supported on jack stands or a lift before working underneath.
• Never work on a vehicle supported only by a jack.
• Refer to your vehicle's service manual for specific torque specifications and procedures.
• Keep hands and clothing clear of moving parts.

Product Overview

The QA1 TD902 Double Adjustable Stocker Shock is engineered for precise control and durability. Key features include:

• Double adjustable design for independent compression and rebound tuning.
• Lightweight aluminum body for reduced unsprung weight.
• 5/8" centerless ground, hard chrome plated, solid piston rod for strength and smooth operation.
• Precision machined aluminum piston with PTFE piston band.
• Deflective disc valving for consistent performance.
• Polyurethane or bearing mounting hardware included (specific to application).

Figure 1: QA1 TD902 Double Adjustable Stocker Shock. This image shows the complete shock absorber assembly with its polished aluminum body and adjustment knobs.

Internal Components and Features

Figure 2: Detailed diagram illustrating the internal components of the QA1 TD902 shock absorber. This includes the piston rod, aluminum body, deflective disc valving, and adjustment mechanisms, highlighting features like the three-step sealing system and precision machined piston.

Installation Instructions

1. Prepare Vehicle: Safely lift and support the vehicle using jack stands or a hydraulic lift. Ensure the suspension is unloaded.
2. Remove Old Shocks: Locate and remove the existing shock absorbers. This typically involves unbolting the upper and lower mounting points. Retain any reusable hardware if applicable.
3. Inspect Mounting Points: Clean and inspect the vehicle's shock mounting points for any damage, corrosion, or wear. Repair as necessary.
4. Install New Shocks:
   • Install the provided polyurethane bushings or bearing mounting hardware onto the QA1 TD902 shock.
   • Position the new shock absorber into the upper mounting point and secure it with the appropriate hardware. Do not fully tighten at this stage.
   • Extend or compress the shock as needed to align with the lower mounting point. Secure with hardware.
5. Torque Fasteners: With the vehicle's weight on the suspension (or at ride height), tighten all mounting bolts to the vehicle manufacturer's specified torque values. Refer to your vehicle's service manual.
6. Final Check: Double-check all fasteners for proper torque. Ensure there is no interference with other suspension or vehicle components.

Note: For coil-over applications, specific coil-over hardware will be included and should be installed according to the separate coil-over instructions.

Adjustment and Operation

The QA1 TD902 is a double adjustable shock, allowing independent control over compression (bump) and rebound (extension) damping. This enables fine-tuning of your vehicle's ride and handling characteristics.

Adjustment Procedure:

1. Locate Adjusters: The shock features two adjustment knobs, typically located at the bottom of the shock body. One knob controls compression, and the other controls rebound. Refer to the markings (e.g., 'C' for Compression, 'R' for Rebound) on the shock body.
2. Initial Setting: It is recommended to start with both compression and rebound adjusters set to a neutral or manufacturer-recommended baseline. This is often achieved by turning the knob fully counter-clockwise until it stops (zero clicks), then turning it clockwise a specified number of clicks. Consult QA1 documentation for specific baseline settings if available.
3. Adjusting Compression: Turning the compression knob clockwise increases the damping force during shock compression (when the wheel moves upwards). This can help control body roll and dive.
4. Adjusting Rebound: Turning the rebound knob clockwise increases the damping force during shock extension (when the wheel moves downwards). This helps control how quickly the wheel returns to its original position after hitting a bump, improving tire contact with the road.
5. Incremental Adjustments: Make small adjustments (1-2 clicks at a time) and test the vehicle's behavior. Note your settings for future reference.
6. Symmetry: Ensure that adjustments are made symmetrically across the vehicle (e.g., both front shocks, or both rear shocks) unless specific tuning requires otherwise.

Tip: Keep a log of your adjustment settings and how they affect vehicle performance to find your optimal setup for different driving conditions.

Maintenance

Regular maintenance helps ensure the longevity and optimal performance of your QA1 TD902 shock absorbers.

• Regular Inspection: Periodically inspect the shocks for any signs of leaks, damage to the body or piston rod, or worn bushings.
• Cleanliness: Keep the shock bodies and piston rods clean, especially after driving in dirty or corrosive conditions. Use mild soap and water, then rinse thoroughly. Avoid harsh chemicals that could damage seals.
• Hardware Check: Verify that all mounting hardware remains tight and secure. Re-torque fasteners to specification if necessary.
• Piston Rod Protection: Avoid scratching or damaging the piston rod surface, as this can lead to seal failure and fluid leaks.
• Bushings: Inspect polyurethane bushings for cracking or excessive wear. Replace them if they show signs of degradation.

Troubleshooting

If you experience issues with your QA1 TD902 shock absorbers, consult the following common troubleshooting steps:

If these steps do not resolve the issue, contact QA1 technical support for further assistance.

Specifications

Warranty and Support

QA1 products are manufactured to high standards. For specific warranty information regarding your TD902 Double Adjustable Stocker Shock, please refer to the official QA1 website or contact their customer service directly. Keep your proof of purchase for warranty claims.

For technical assistance, installation questions, or troubleshooting beyond the scope of this manual, please contact QA1 customer support:

• QA1 Official Website: www.qa1.net
• Customer Service: Refer to the website for current contact information (phone, email).