IBM Selectric - Operational Area

The Customer Engineer will usually make his adjust-
ment, tighten the lock nut, and find his adjustment
has changed severa I days later. This is due to the I
limited engagement of the nut on the clevis. When~
ever you are making this adjustment, check the clevis
to be sure there is no burr on the bottom and if there,
is, remove the clevis and file the burr away.
This burr cannot be removed due to manufacturing
tolerances. A new design is anticipated very shortly.
Burr
Figure
8.3
8.4
9.0
9.1
9.2
9.3
S.H. THREADING OF ARMATURE BY INTERPOSER
LINKS
Repeat cyc les or fai lure to re lease an interposer may
be caused by the threaded portion of the link biting
into the armature, ,causing an improper'link adjust-
ment.
OPERATIONAL AREA
Operati ona I Notes
REPEAT FUNCTIONS
There are no repeat functions on the I/O Printer,
consequently the Operational Keylever Pawls require
on Iy the bottom lug. The top lug (Repeat Lug) shou Id
be broken off.
NYLON CORD DRUM
If the slot in the Nylon Cord Drum opens or breaks" a
new slot may
be made with a spring hook which has
been heated.
INTERPOSER HEIGHT
The operational interposer height may be adjusted by
using the following procedure:
a. Hold the Clutch Release Arm so that the cam re-
peats.
b. Turn the Interposer adjusting screw clockwise,
unti I the mechanism begins to operate (carrier
begins to move).
9.4
9.5
5·13
c. Back the adjusting screw out unti I the mechanism
stops
operoti ng, then bac kit out an addi ti ona I
1/2 turn.
S . H. EXCESSIVE UP AND DOWN PLAY AT THE lH
END OF THE OPERATIONAL SHAFT
Excessive up and down play at the LH end of the op-
erationa I shaft requires the replacement ·of the black
nylon sleeve in the torque limiter hub and the cycle
clutch pu lIey hub.
S.H. OPERA110NAl SHAFT REMOVAL
1. Remove shift clutch ratchet and clutch spring.
Do not disturb the clutch arbor.
2. Loosen set screws in: Torque limiter hub, tab
governor hub, tab governor co liar, operati ona I
cam ratchet (and R. H. shaft collar if long car-
riage) .
3. Remove clip from C.R. pinion spring.
4. Push torque limiter hub to the left as far as poss-
ible; then spread the coils on the CR pinion
spring and, with the pusher end of a springhook,
push the left hand pi ni on retai ner off the shaft .
5. Move the pinion gear to the left and remove the
retainer clip at the right side.
6. The operati ona I shaft may now be pu lied out
through
the shaft bearing toward the right. Any
part mounted on the shaft or around it may be
easi Iy removed or rep laced.
Since the shift clutch arbor has not been loosened
from
the shaft, upon rei nsta lIati on the shaft ne~d on ly
be pushed inward unti I the shift clutch arbor bears
against the shift bearing (.002" - .004
11
end play) to
insure placing the carrier return pinion gear back into
the same position as before disassembly. None of the
shift mechanism has been removed; therefore, no shift
adjustments
need be remade or checked.
In order to reset the operational cams in their original
position use the "tracks II on the cam follower rollers
as a
guide. With ratchets which have only the set
screw, be certain the screw is tightened to the flat
side on the operational shaft.
Reset the tab governor hub and collar, observing the
proper mesh and end play adj ustments .
After re-installation of the C-clip retainers on either
side of the carrier return pinion gear, move the tor-
que limiter hub to the right as far as possible. Then
spread the torque limiter spring loops and insert a
.005
11
feeler gage blade between the torque limiter
hub and the torque limiter arbor. Tighten the torque
limiter hub, then remove the gage.
Insta \I the c lip which fastens the CR pinion spring to
the torque limiter arbor.