IBM Selectric

1. Loosen the two latch mounting screws and pui'l
the latch to the top of its adjustment.
2. Snug the screws "lightly".
3 . Turn the pri nt or cyc Ie shaft ina pri nt di recti on.
(This will force the cycle clutch sleeve down on
the cycle clutch latch.) Using the Hooverometer,
check the latch height unti I it is correct.
4. Tighten the cyc Ie clutch latch mounting screws.
Keeping the sleeve surface in contact with the latch
surface wi II insure that the latch wi II remain parallel
to the sleeve whi Ie you are adjusting its height.
15.3 CYCLE CLUTCH COLLAR ADJUSTMENT
The
Cyc Ie Clutch Co liar shou Id be rotated back or
front
to allow the spring clutch to disengage from the
cycle shaft 3/32" to 1/8" before the Cycle Shaft
Ratchet latches on its check pawl. This adjustment
is accomplished as follows:
a. Loosen the Cycle Clutch Overthrow Stop (white
nylon cam).
b. Slowly hand cycle a -5 rotate, 0 tilt character.
When the cyc Ie shaft stops turning, mark a ref-
erence point on a print shaft gear tooth and its
bearing. Unlatch the Cycle Clutch and very
slowly rotate the Cycle Shaft unti I the check
pawl falls into the ratchet on the Cycle Shaft.
Once again, observe the print shaft gea~ - it
shou Id have moved 1/2 to 3/4 of a tooth.
c. Tighten the collar, being sure to allow .010" -
.015" end play in the Cycle Clutch Sleeve.
d. Adjust the Cycle Clutch Overthrow Stop (white
nylon cam), front to rear, to allow .007" to
.015" rotary motion of the Cycle Shaft when it
is latched up. This clearance may also be ob-
served on the degree wheel as 1 to 3 degrees.
15.4 CYCLE C'LUTCH RESTORING ADJUSTMENT
An
easy method of adjusting the restoring cam roller
is as follows:
1. Loosen the restoring cam rofler nut and allow the
ro lIer to drop free.
2. Hand cycle the machine until the roller is on the
high point of the cam.
3. Place the pusher end of a large spring hook be-
tween the cycle clutch latch pawl and the keep-
er. (Insert the spring hook through the hole in
the RH side of the keyboard and over the switch
leads to hold it in place.)
4. Place the machine on its feet and holding the
roller firmly against the cam, tighten the lock-
ing nut.
4-21
5. Remove the spri ng hook and check for the proper
clearance of .020" to .025" between the latch
pawl and the keeper, on the cam iobe providing
the sma lIer clearance.
NOTE: Insure that the keeper is adjusted for proper
latch bite before you adjust the roller.
15.5 If the above sequence of adjustments does not produce
correct cyc Ie clutch operation, check for the follow-
ing conditions:
a. Worn Spring Clutch (Replace).
A new style, heavier cycle clutch spring is avai 1-
able for field replacement. It may be identified
by its bronze color. A complete new cycle shaft
assembly, PN 1266830 (13") or PN 1266831 (15")
should be used when making this change since the
new assembly is pre-adjusted and includes the
following new parts: (1) spring (2) collar (3) re-
store cam (4) sleeve. The new shaft is black
colored.
b. Lack of spring clutch lubrication (use #23).
c. Binds in the operational shaft or shift clutch as-
sembly.
d. Bind or lack of lubrication in the drive gears
(remove, clean, lubricate).
e. Bind in the print shaft or carrier and rocker,
f. Excessive cyc Ie clutch restoring overthrow caus-
ing the latch to rub on the low dwell of the
sleeve.
g. Rounded Cycle Pulley Arbor
Before
replacing cycle clutch spring,· be sure to
check the edge condition of the cycle pu lIey
arbor. A rounded edge is easily detectable by
re-inserting the bare cycle shaft into the machine
and observing the juncti on of both arbors.
If a rounded arbor is detected, replace with hub
and pulley assembly, PN 1135619.
CAUT 10 N: 1135619 is an I/O part number.
Do not use standard "Selectric" hub and pulley
assembly.
h. Worn cyc Ie clutch latch or the bond between
meta I clutch stop and the rubber shock absorber
on clutch latch is breaking loose.
15.6 CYCLE CLUTCH PULLEY AND HUB ASSEMBLY
The Cyc Ie Clutch Pu lIey can be oversize. Check for
this
condition by holding the Carrier against a re-
turn. If the be It thumps and the motor vibrates back
and forth the pu Iley may be oversize.
Remove the belt from the Motor Pulley and wrap it
around
the Cycle Clutch Pulley to determine if the
cogs on the be It match the cogs on the pu Iley. An
oversize pulley should be replaced, following the
procedure outlined in the Reference Manual.
15.7 POWER FRAME CENTER BEARING
When removal of the cycle shaft is necessary on any
Selectric I/O Printer, the cycle clutch pulley should