NORAC UC4.5-BC-RA1 - Manual (Page 12)

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4. Set the boom suspension to be critically damped (Figure 7). Adjust the boom springs and
dampers accordingly.
A) Unlock the boom, and push boom tip down approximately 75 cm (30 inches).
B) Hold the boom steady for a moment, and release.
C) Ensure the boom returns to its relaxed state as quickly as possible, with little to
no overshoot.
Figure 7: Boom Push Test: Critically Damped
5. Adjust the slant speed of the boom until the full stroke of the slant cylinder (not the boom)
is 6 seconds (Figure 8). This is the time required for the slant cylinder to travel from fully
extended to fully retracted, or vice-versa.
Figure 8: Setting the Slant Speed
6 Seconds