VARILITE VL4 Manual page 99

02.9628.0010
7-Oct-97
Note: Magenta motor drive shaft has two bearings that secure shaft in
place, one in bulkhead and one in motor mount. Bearings are not glued in
place and may fall out when motor or drive shaft is removed.
Step 4. Remove spur and worm wheels from drive shaft.
a. Remove drive shaft from motor mount.
b. At spur wheel, using 1/16 inch Allen wrench, loosen
setscrew in spur wheel and slide spur wheel off drive shaft.
c. At worm wheel, using 1/16 inch Allen wrench, loosen
setscrew in worm wheel and slide wheel off drive shaft.
Step 5. Install replacement worm wheel and spur wheel on drive shaft.
a. Install replacement worm wheel near center of drive shaft
and loosely tighten setscrew.
b. Install spur wheel back onto drive shaft and loosely tighten
setscrew.
c. Apply thick bead of Versilube onto magenta stepper motor
worm wheel.
d. Verify that motor mount drive shaft bearings is installed in
place.
Step 6. Install motor mount and drive shaft in bulkhead.
a. Install drive shaft in place on motor mount.
Note: Drive shaft will not be secured in place until shaft is installed in
bulkhead bearing.
b. Center worm wheel with worm gear and fully tighten worm
wheel setscrew.
c. Verify that magenta filters are in fully opened position.
d. Orient spur wheel so that setscrew is visible thru notched
cutout in motor mount from motor side of mount and install
motor mount and drive shaft in bulkhead. Verify that drive
shaft is fully seated in bulkhead bearing and that spur wheel
setscrew is visible.
e. Install and fully tighten two 4-40x3/8"PFZ screws and two
4-40x3/8"PPZ screws and #4 internal tooth lock washers
that secure motor mount in bulkhead.
f. At bulkhead drive shaft bearings, while pushing in drive
shaft with index finger, using thumb, pull spur wheel as far
as possible to bulkhead bearing and tighten spur wheel
setscrew. This reduces spur wheel end play.
Step 7. Complete replacement by doing Steps 2 and 3 in reverse.
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