Z-belt tension is most accurately measured using a BRECO meter. Should a BRECO meter not be available the z-belt tension needs to be measured as described under Z-Drive Belt Tensioning in this manual.
The specification for z-belt tension is 72-78 Hz (or 6.8+/-0.3 lbs with the force gauge). The machine must be set to the Z head-up position and the z-belt tension measurement has to be taken at the midpoint between the motor pulley and upper z-pulley when using the gauge.
Should the belt tension be out of the specified range it needs to be re-tensioned. Use the guidelines outlined in Z-Drive Belt Tensioning.