Console Reduced-Function Printing Unit; Lubrication; Adjustments - IBM Selectric Maintenance Manual

Section 5. Console Reduced-Function Printing Unit
Refer to other sections of this manual for specifications and
procedures not found here. Except for the speci al reduced-
function mechanisms specified in this section, lubrication
specifications, adjustments, and removal procedures conform
to specifications and procedures described earlier in this
manual for the latest conventional Selectric I/o Keyboard-
I essPri nter .
Lubrication
Lubrication to be appl ied to modified components of the
reduced-function printing unit is specified in the following
chart. The sequence of lubrication is compatible with that
shown in Section 1 for the keyboardless printer (bottom,
right, left, rear, top).
Side
Bottom
Rear
Top
IBM #10 Oil
C5/6 bellcrank pivot
(felt reservoir)
C5/6 O/P nylon pad
(film only and
only on replace-
ment)
End-of-line micro-
switch roller
(small amount
on replacement
only)
Adjustments
Cycle Clutch Magnet
IBM 623 Grease
Cycle cl utch armature
pivots
Cycle clutch shock plate
pivots
Cycle clutch armature
spring end loops
Operational magnet
armature pivots
C5/6 bellcrank ~triking
surfaces (up stop
and cam followers)
I ndex pawl stop
There are five adjustments of the cycle clutch magnet
assembly (Figure 5-1). They are:
1. energi zed armature -to-lower-yoke clearance,
2. energi zed armature-to-core clearance,
3. latching cushion compression,
4. de-energized armature-to-upper-yoke clearance, and
5. energized armature-to-clutch-sleeve unlatching
clearance.
The height and latching angle are pinned and have no
provision for adjustment.
Adjust the cycle clutch magnet assembly in the following
sequence, the first four steps with the assembl y out of the
machine and the last step with the assembly installed. Be
sure the residual is firmly in place against the upper yoke.
NOTE: Steps 1-4 are for setting up the magnet assembly;
step 5 determines its mounting position in the machine.
5-1
.030".± .002" Clearance with
. Assembly Out of Machine and
Armature at Rest
For .007"-.011"
Clearance Here
with Armature - - -
Sealed
.010"-.016" Clearance
with Armatuare Sealed
Adjust for .030" .± .005"
Armature Displacement
Under 15 lb. Force
.008"-.010" Unlatching Clearance
with Armature Sealed
~·---
.....
~Front
FI GURE 5-1. Cycle Clutch Magnet Assembly
1. Raise or lower the armature pivot to provide .010" -.016"
clearance between armature and lower yoke with the
armature sealed against the upper yoke residual.
2. Use one (only) shim (see table) between yoke and core to
provide .007" -.011 " clearance at the closest poi nt
between armature and core with the armature sealed
against the upper yoke.
Bross Shim
P/N
Thickness
1166986 .002"
1166987
.003"
1166988
.005"
1166989
.007"
1166990
.009"
3. Loosen the latching cushion adjusting screw and turn it
unti I the cushion barely starts to compress. Compress
the cushion 1 1/3:f; 1/6 more turns of the screw and
tighten the locknut. This provides for .030";to .005"
longitudinal armature movement if a 15 lb. force were
exerted against the end of the armature.
4. Raise or lower the limit stop plate to provide .030"
~
.002" clearance between the upper yoke residual and
the armature in rest position. Make this adjustment
carefully because it determines the depth of armature
bite on the clutch sleeve latching surface.
5. Slide the clutch magnet bracket front or rear to provide
. 008" -.010" unlatching clearance with the armature
sealed against the upper yoke. Measure the clearance
to the highest part of the clutch sleeve.
NOTE: The clutch rests at a different point than other
Selectric I/O printers, and you need a special half-cycle