IBM Selectric Service Manual

a Iso be removed and the center bearing qri lied.
This wi II improve the lubrication of the cyc Ie clutch
pulley and increase center bearing life. Remove the
felt wick from the lubrication\hole and drill a #32
hole through the upper part of the bronze bearing.
Be sure to remove a II dri lIings from the inside of the
bearing and lubrication hole. The felt wick should
be replaced to keep dirt out of the bronze bearing.
Caution: The center bearing is an oi I impregnated
bearing and should not be flushed with cleaning fluid.
Note: Before and after assembly, the center bearing
should be lubricated with #10 oil. The pulley should
be inserted in
the bearing before replacing the felt
wick.
15.8 CYCLE CLUTCH RESTORE CAM REPLACEMENT
There have been instances where the cycle clutch re-
store cam will break or warp and require immediate
replacement. A time-saving method of replacing the
cyc Ie clutch restore cam when it is not necessary to
remove the cycle shaft is outlined below.
I. Remove the two locking screws and clips from
the white nylon restore cam.
2. Cut the white nylon restore cam with a pair of
dykes or wi re cutters and remove the secti ons of
the cam from the shaft.
3. Using a fine hacksaw or coping saw blade, cut
Cut Here
Figure 15.1
a new
cyc Ie clutch restore cam as shown in Figure
I.
Cut Here
4. De-burr the two sections of the restore cam,
p lace them on the cyc Ie shaft, one at a ti me,
and i nsta II thei r locking screws and clips.
5. Adjust the overthrow of the cycle shaft for .007"
to .015" (3° to 5°) of rotary motion. This ad-
justment must be checked on both lobes of the
cam since the cam is now sp lit and each lobe is
independently adjustable. It will only be nec-
essary to loosen one set screw to adjust the over-
throw on that parti cu lar lobe. When both si des
are the same, re-tighten the set screws.
This method of replacing a restore cam will save ap-
proximately one hour and fifteen minutes in the Field.
It shou Id be remembered that this fix is a temporary
fix
and the white nylon restore cam should be replaced
the next time the cycle shaft is removed for spring
clutch rep lacement or pu II ey rep lacement.
The new cyc Ie. clutch restore cam may be ordered
under Part No. 1135995.
15.9 CYCLE CLUTCH INHIBITOR
The new style cycle clutch inhibitor mechanism which
will be used on all keyboard less SELECTRIC I/O
Printers has been illustrated below.
The adjustments are as follows:
I. Adjust the inhibitor trip lever so that the bottom
edge of the inhibitor pawl is flush with the bot-
tom edge of the cyc Ie clutch latch with a II parts
at rest.
2. The inhibitor pawl mounting bracket should be
adjusted so that the inhibitor pawl clears the cy-
cle clutch latch by .030" to .035" with all
parts at rest.
Latch
.Figure
15.2
15.10 CYCLE CLUTCH CHECK PAWL
Some cyc Ie clutch spri ng wear has been traced to the
check pawl bouncing back out of its detented posit.ion
on
the cycle shaft ratchet when the cycle shaft lat-
ches up. We previously recommended increasing the
spring tension on the cycle clutch check pawl to al-
leviate this problem.
4-22

IBM Selectric Specifications

General

Type	Electric typewriter
Introduced	1961
Keyboard Layout	QWERTY
Carriage Return	Electric
Manufacturer	IBM
Printing Technology	Typeball (golf ball)
Power Source	AC Power
Power Supply	120V AC