IBM 1403 Field Engineering Maintenance Manual page 46

5. Remove the lower compression plate.
6. Remove the reverse-drag friction ring. Caution:
Note the direction of the teeth on the friction ring.
The teeth on the upper friction ring are opposite
to the teeth on the lower friction ring. Therefore,
these rings can be incorrectly assembled.
7. The friction surfaces of the friction ring, spool
driver, and lower compression plate should be clean
and free from oil.
8. Reassemble in reverse order.
a. Be sure that none of the three compression
springs is lost.
b. Be certain that the reverse-drag friction ring is
not installed backwards. After the assembly is in
the machine, the upper pawl should ratchet when
the upper spindle is turned counterclockwise
(viewed from the spindle end). The lower pawl
should ratchet when the lower spindle is turned
clockwise (viewed from the spindle end).
Ribbon-Clutch Removal and Adlustment
1. Removal procedure:
a. Remove the cover and the ribbon assembly.
b. Remove the ribbon.
c. Move the ribbon-drive unit to the left.
d. Remove the cover over the left side of the lower
ribbon drive.
2. Remove the lower ribbon drive (not necessary for
clutch removal).
a. Remove the horseshoe clip on the lower ribbon-
drive assembly.
b. Remove the lower ribbon drive.
CLUTCH ENGAG ED
Figure 37. Tooth-Style Ribbon Clutch
46
3. Free the ribbon clutch.
a. Remove the horseshoe clip on the ribbon clutch
shaft.
h. Remove the screws
in
the clutch magnet hous-
ing.
c. Remove the clutch magnet housing.
4. Remove the ribbon clutch.
a. Hold the clutch-shaft drive gear in your left
hand to prevent
it
from falling. Be careful not
to lose the key.
b. Remove the ribbon clutch from the right.
5. Position the rotor assembly.
a. Seat the ribbon-clutch output pinion against
the rotor assembly.
h. Position the rotor assembly for a clearance be-
tween the pinion and the shoulder on the clutch
shaft of .001" to .004".
c, Lock the rotor assembly to the shaft.
6. Tooth-style clutch adjustment (Figure 37):
a. Seat the pinion against the rotor assembly.
b. Push the armature to engage the serrations.
c. Position the clutch-armature drive ring for a
clearance to the armature of .028" to .032". A
double set of screws (four, two in each hole)
holds the ring.
d. Tighten the setscrews in the armature ring.
e. Seat the armature against the drive ring.
f. If a clearance between the serrations of the
armature and the rotor assembly of .003" mini-
mum does not exist, repeat adjustments from
step c.
CLUTCH DISENGAGED