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Non-Spiral Groove

  1. Remove shock absorber. See SHOCK ABSORBER  under REMOVAL & INSTALLATION. Purging air from non-spiral groove shock absorbers is not necessary. The shock absorbers have a gas-filled cell in their reservoirs (as opposed to the air-filled cell in the spiral groove shock absorber reservoirs).
  2. Place the shock absorber in a vise with the jaws clamped on the shock absorber's top mount. Shock absorber should be held vertically in the vise with its bottom end up. Do not clamp the vise jaws on the shock's reservoir tube.
  3. Pump the shock absorber at various rates of speed and observe the rebound force. Rebound force is normally stronger than the compression force (approximately 2-to-1). Rebound force should be smooth and constant for each stroke rate.
  4. Compare with a good shock absorber.
  5. If one of the following conditions are observed, replace the shock absorber. See SHOCK ABSORBER  under REMOVAL & INSTALLATION.
    • A skip or lag at reversal near mid-stroke.
    • A seize (except at the extreme ends of travel).
    • A noise (grunt or squeal) after completing one full stroke in both directions.
    • A clicking noise at fast reversal.
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