The 521 seat uses 4 coil springs to carry a far greater load (80-150kg) Mainly for use with heavy operators or extra items bolted to seat upper. Note: Seat will not operate for an operator under 80kg * 100mm mechanical suspension stroke * 60mm seat height and tilt * 80-120kg weight adjustment * Full seat back recline * 200mm slide rail adjustment * Provision for second damper * 5 position lumbar adjustment
