Beckman Couler ALLEGRA X-12/R, Service Manual, Page: 35 / 83

Section 3: Service Procedures
J. Pull drive upward, including the white support ring, while feeding the motor harness
through the opening. To ease the removal of the brass cone use a screwdriver to
widen the slit and pull the cone of the shaft.
K. Remove three Phillips screws that attach the Rotor ID sensor plate and retain three
spacers, remove the rotor ID sensor.
L. To reinstall drive, feed harness through the drive opening.
M. Make sure the white ring lines up with the mounting holes in the suspension plate.
N. Carefully set drive down on the suspension plate and ensure the harness is not
pinched.
O. Lightly coat the four new grommets with vacuum grease.
P. Place grommets, washers and nuts on top of drive, make sure screws stay in place and
being held with angled Philips screwdriver while tightening the nuts.
Q. Tighten the four lock-nuts until the specified dimension between the suspension
plate and top of the white ring equals 5/8 inch.
Q. Reinstall Rotor ID and cone.
R.
Reconnect all connectors and lock in the cable in the cable holders.
S. Reinstall imbalance bracket.
** Remove silicone sealant from chamber lip and clean boot outer groove of cured
silicone. Apply small bead of GE Silicone #108 to the outer groove of the boot.
T. Reinstall boot.
U. Reinstall front panel.
NOTE
: The boot must remain completely seated down around the motor cover to
prevent contact with the rotor.
Warning: Unplug the centrifuge or turn off and lock out the main wall circuit
breaker before removing an instrument panel.
Warning: As long as the yellow LED on the Motor driver board is lit, the Bus Voltage is
still present. Wait until LED is off.
3.1.3 Drive Motor Replacement Allegra X-15R
**Materials needed: Silicone RTV 108 (342778)
A. Open lid, TURN POWER SWITCH OFF AND DISCONNECT POWER CORD.
B. Remove four screws on the top housing to open the front panel.
C. Disconnect the drive connector J16 from the Motor Driver board and remove the
cable from the cable holder.
D. Disconnect the tach sensor connector J10, Rotor ID connector J8 and motor overtemp connector
J11 from the Control Board.
E. Disconnect the ground wire and remove the cables from the cable holder.
F. Remove the boot from the bowl.
G. Remove four motor mounting nuts.
H. Pull drive upward while feeding the motor harness through the opening.
3-2 Allegra X-12/R, X-15R Service Manual 07/07