DIY Maintenance Guide for Your Arma V3 Rear Shock

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The Arma V3 [paid link] rear shock from EXT is a high-performance component designed to provide exceptional ride quality and durability. Proper maintenance and tuning of your shock can significantly enhance your bike’s performance and extend its lifespan. This guide will walk you through the steps for installation, adjustment, maintenance, and troubleshooting, as well as how to optimize the shock for maximum performance. By the end of this article, you’ll have a solid understanding of how to care for your Arma V3 [paid link] rear shock and keep it functioning like new.

Tools Required

  • Torque wrench [paid link]
  • Shock pump
  • 8mm and 10mm Allen wrenches [paid link]
  • 3mm Allen wrench [paid link]
  • Lubricant (suspension-specific)
  • Soft cloth or rag
  • Air compressor (optional)
  • Service kit (from EXT, including oil and seals)
  • Bench vice (optional)

Installation of the Arma V3 Rear Shock

Installing the Arma V3 rear shock is a straightforward process, but attention to detail is essential to ensure proper function and avoid damaging the shock or bike frame.

  1. Preparation: Ensure your bike frame is clean and free of debris. Check for any loose components before installation.
  2. Removing the Old Shock: If you’re replacing an existing shock, begin by removing it using the appropriate tools. Typically, you will need a 10mm Allen wrench [paid link] to remove the mounting bolts. Make sure to keep track of the hardware for reinstallation.
  3. Aligning the New Shock: Position the Arma V3 shock in the frame’s shock mount. Make sure it is oriented correctly and aligned with the suspension linkage. The eyelet should be facing the correct direction according to your bike’s specifications.
  4. Attaching the Shock: Using the 8mm or 10mm Allen wrench, tighten the mounting bolts securely. Be sure to follow the manufacturer’s torque specifications to avoid over-tightening or under-tightening, which could affect the shock’s performance.
  5. Inflating the Shock: Using a shock pump, set the air pressure according to your rider weight and desired ride feel. Start with the recommended settings from EXT, and adjust later based on ride testing.

Adjusting the Arma V3 Rear Shock

Once installed, the Arma V3 rear shock may require fine-tuning to match your riding style and preferences. The shock offers several adjustable features, including rebound, compression, and air pressure. Here’s how to adjust each one:

Air Pressure Adjustment

  • Purpose: The air pressure in the shock determines how much the shock compresses under load. Too high or too low pressure can negatively affect your ride quality.
  • Adjustment: Use a shock pump to adjust the air pressure. Start by setting the pressure based on the recommended range, typically provided by EXT for your weight. From there, you can make small adjustments while testing to find the optimal pressure for comfort and control.

Rebound Adjustment

  • Purpose: Rebound controls how quickly the shock returns to its original position after compression. Too fast, and it will feel bouncy; too slow, and it will feel sluggish.
  • Adjustment: Locate the rebound adjustment knob on the shock body. Turning it clockwise typically slows down the rebound, while counterclockwise speeds it up. Begin with a neutral setting, then adjust based on your riding conditions and preferences.

Compression Adjustment

  • Purpose: Compression damping affects how the shock resists compression under impacts. Adjusting compression can help with both performance and comfort.
  • Adjustment: The Arma V3 has separate high-speed and low-speed compression adjusters. Start with the low-speed compression adjuster and set it to a middle position. The high-speed compression should be set for a firmer feel on aggressive terrain, but be careful not to make it too stiff as it could reduce traction.

Maintenance of the Arma V3 Rear Shock

To ensure optimal performance, your Arma V3 rear shock requires regular maintenance. Here’s a breakdown of what needs to be done and how often.

Cleaning the Shock

  1. Frequency: After every ride, especially in muddy or wet conditions, it’s important to clean the shock to prevent dirt and grime from affecting its performance.
  2. Method: Use a soft cloth to wipe down the shock, removing dirt and debris from the shaft and surrounding areas. Be sure to avoid harsh chemicals that could damage the seals. If you use water, ensure the shock is dried completely afterward.

Lubricating the Shock

  1. Frequency: Apply lubrication to the shock’s seals and moving parts every few rides to reduce friction and protect against wear.
  2. Method: Use suspension-specific lubricants to coat the seals and ensure smooth operation. Avoid using general-purpose oils or lubricants, as these may damage the shock.

Replacing the Shock Oil

  1. Frequency: The oil inside the shock needs to be replaced periodically to maintain damping performance. This depends on the amount of riding and the conditions in which you ride, but it’s recommended to change the oil every 50-100 hours of riding.
  2. Method: To replace the shock oil, first remove the shock from the bike. Next, follow EXT’s service instructions to disassemble the shock, drain the old oil, and refill with fresh oil. Be sure to use the correct oil type specified by EXT.

Replacing Seals

  1. Frequency: Over time, the seals on the shock will wear out. This can cause air leaks, reduced damping performance, and even damage to the internal components.
  2. Method: Seals can be replaced by carefully disassembling the shock, cleaning the components, and installing new seals. It’s best to use a service kit provided by EXT to ensure you have the correct parts.

Troubleshooting Common Issues

Air Leaks

  • Cause: Air leaks can occur if the shock’s seals are damaged or if the shock was over-pressurized.
  • Solution: Inspect the seals for wear or damage. If you find any, replace them. Additionally, check the air valve to ensure it is functioning correctly. If leaks persist, a full service may be needed.

Poor Rebound Control

  • Cause: If the rebound is too slow or too fast, it could be due to incorrect adjustment or a buildup of dirt.
  • Solution: First, check and adjust the rebound settings. If this doesn’t resolve the issue, disassemble the shock and clean the rebound damping cartridge. Replace any worn components as needed.

No Compression Damping

  • Cause: This can occur if there’s a problem with the compression adjustment mechanism or a buildup of debris.
  • Solution: Check the compression knob and adjuster for functionality. If the adjuster moves but doesn’t change the feel of the shock, the internal components may need servicing.

Customizing the Arma V3 Rear Shock for Performance

Customization can help you get the most out of your Arma V3 rear shock, especially when riding specific types of terrain. Here are some suggestions for optimization:

  • For Cross-Country Riding: Lower the air pressure slightly to increase traction and provide a smoother ride on rough terrain. Fine-tune the rebound for quick recovery to maintain speed.
  • For Enduro and Downhill: Increase air pressure for a firmer ride and adjust the compression damping to resist bottoming out during big hits. Ensure the rebound is fast enough to keep the bike responsive.
  • For Trail Riding: A balanced setup with moderate air pressure and a mid-range compression setting will provide both comfort and control over mixed terrain.

Compatibility with Other Drivetrain Components

The Arma V3 rear shock is designed to be compatible with most modern mountain and trail bikes, but it is important to ensure that it works with your specific frame and suspension linkage. Always check the manufacturer’s specifications for shock length, stroke, and eyelet size to ensure a proper fit.

In addition, the shock’s performance can be influenced by your bike’s drivetrain and suspension setup. For example, if you have a high-performance drivetrain, pairing it with a high-quality shock like the Arma V3 can deliver a more seamless riding experience. However, ensure that the shock is properly tuned to complement the stiffness or flex of your bike’s frame and other suspension components.

By following these maintenance and tuning tips, you can keep your Arma V3 rear shock performing at its best, ensuring a smooth and controlled ride on all types of terrain.