4-18
Counterweight Balancing
The column assembly trim cover must be removed from top of column assemĆ
bly as shown in Section 4-1.
1. Secure the collimator hand switch closed with a tyĆwrap or piece of tape to enerĆ
gize the vertical column brake (as well as all other brakes and latch solenoid).
2. With all hardware in place, check the force required to move the tube/arm assemĆ
bly upward and downward. If the force needed to move it up is equal to the force
needed to move it down, the vertical column is balanced. Proceed to Step 5.
3. If the vertical moving forces are unequal, eight oz. (0.23 kg) counterweights (part
number 46-279784P1) should be added or removed (approximately four are inĆ
stalled at the factory).
a. Move the tube/arm to its lowest possible position. This will raise the counterĆ
poise mass and counterweight to the top of the vertical column where the
counterweight can be accessed.
b. Loosen and remove the two locknuts and washers that hold the counterĆ
weights to the counterpoise.
c. Add or remove counterweights as required,
d. Replace the washers and locknuts, and tighten locknuts.
4. Repeat Step 2. If the moving forces are equal, proceed to Step 5. If they are still
unequal, repeat Step 3.
5. Replace trim cover on top of vertical column and secure with two hex socket butĆ
ton head capscrews.
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