Castle AT-8 Diagnostics Manual - Manual (Page 9)

How To…
8.22
Adjusting the Arm Bearings
The arm rides on two sets of bearings, one at the bottom bracket and one at the upper bracket. If the
arm becomes loose or rides on the beam roughly, then these bearing sets may need to be tightened.
This procedure requires two people.
SOLUTION STEPS:
1. LOOSEN the four bolts in the top bracket that hold the arm in place while someone holds the
bottom bracket firmly in place against the table.
2. Do not loosen the bottom bracket bolts.