Which of the following is a true statement about changing a base motor when the
dental chair is in the "DOWN" position?
a. You do not need to remove the chair as you do when the chair is in the UP
b. You must always replace the chain when you replace the motor.
You must be sure the limit switch cover is secure before you slide the gear
d. You will need a helper to lift up on the lift assembly while you remove the
Which of the following applies to replacing the back motor?
a. Lower the chair to its minimum height, place the back in full recline, and put
seat in full downtilt.
b. Support the back of the chair when you loosen the set screws on the seat
motor screw tube pivot pins.
Pry the pivot pins out of the pivot castings, raise the toe section of the chair,
and place a wood block between pivot casting and chair mount casting.
d. Always replace the back motor bracket as well as the back motor by removing
the set screws and the trunnion pins securing the two together.
Which of the following applies to replacing the seat motor?
a. You can replace the limit switch without replacing the seat motor.
b. You can remove the seat motor without removing the chair from the pedestal.
You must not rotate the screw tube more than 1/2 turn when you secure the
seat motor gear housing to the cradle casting.
d. You must take care not to drive the pins into the housing when you are
securing the seat motor gear housing to the cradle housing.
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