The two drive belts are constructed of a high reliability
fiberglass/neoprene/nylon composite and should last throughout the life of the
unit. To ensure smooth operation and to prevent premature failure, belts
being stored should be protected against sharp bending or creasing. They
should never be subjected to extremely high or low temperatures, high
humidity, or high ozone concentrations while being stored. If a belt must be
replaced, follow the procedure below. The belt driven from the clutch/brake
(on the observer's left when facing the front) is referred to as the "front-to-
back" belt. The belt driven directly by the motor is the "side-to-side" belt.
f. Front-To-Back Belt Replacement.
Turn off power to the SFD.
(2) Remove the imaging system following the instructions provided by the
Remove the rear cover, following the instructions in paragraph 3-6a (2).
(4) Remove the front cover by removing the three screws securing the rear
lip to the chassis. Lift the cover up and back to disengage the front studs.
(5) Remove the imaging-system adapter plate by removing the eight screws
securing it to the SFD and lifting it from the chassis.
Loosen the tensioning pulley above the clutch/brake assembly.
Disconnect the flag on the carriage from the belt.
(8) If necessary, remove the four screws securing the clutch/brake
assembly to the chassis.
(9) Remove the worn or broken belt and install the replacement belt.
(Reassembly is a reversal of the above procedure.)
Be sure to fasten the imaging system adapter plate securely. Use
LoctiteTM #232 on the screw threads after thoroughly cleaning off any oil
(10) Be sure to re-tension the drive belt (3/8-inch [9mm]) deflection).