IBM Selectric - Page 165

1. Loosen the two latch mounting screws and pull
the latch to the top of its adjustment.
2. Snug the screws lllightlyli.
3'. Turn the print or cycle shaft in a print direction.
(This wi II 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 cycle clutch latch mounting screws.
Keeping the sleeve surface in contact with the latch
surface will insure that the latch wi\.! remain parallel
to the sleeve whi Ie you are adjusting its height.
15,3 CYCLE CLUTCH COLLAR ADJUSTMENT
The
Cyde Clutch Collar should be rotated back or
front to allow the spring clutch to disengage from the
cycle shaft 3/32
11
to 1/8
11
before the Cycle Shaft
RatcheJ latches on its check pawl. This adjustment
is
accomplished as follows:
a. Loosen the Cycle Clutch Overthrow Stop (white
nylon
cam).
b. Slow Iy hand cyc Ie a -5 rotate, 0 ti It 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 gear - it
should have moved 1/2 to 3/4 of a tooth.
c. Tighten the collar, being sure to allow .010
11
-
.015
11
end play in the Cycle Clutch Sleeve.
d. Adjust the Cycle Clutch Overthrow Stop (white
nylon
cam), front to rear, to allow .007
11
to
.015
11
rotary motion of the Cycle Shaft when it
is latched up. This clearance may also be ob-
served on the degree wheel as ] to 3 degrees.
15.4 CYCLE CLUTCH RESTORING ADJUSTMENT
An easy method of adjusting the restoring cam roller
is as fo 1I0ws:
1 . Loosen the restoring cam roller nut and allow the
ro Iler to drop free.
2. Hand cycle the machine unti I 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 firm Iy against the cam, tighten the lock-
ing nut.
5·21
5. Remove the spring hook and check for the proper
clearance of .020
11
to .025
11
between the latch
pawl and the keeper, on the cam lobe providing
the sma Iler 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 cycle clutch operation, check for the follow-
ing 'conditions:
a. . Worn Spring Clutch (Replace).
A new style, heavier cycle clutch spring is avail-
able for field replacement. • It may be identified
by its bronze color. A complete new cycle shaft
assembly, PN 1266830 (13
11
) or PN 1266831 (15
11
)
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 restori ng overthrow CotJs-
i ng the latch to rub on the low dwe \I of the
sleeve.
g. Rounded Cycle Pulley Arbor
Before replacing cycle clutch spring, be sure to
check the edge condition of the cycle pulley
arbor. A rounded edge is easi Iy detectab Ie by
re-inserting the bare cycle shaft into the machine
and observing the junction of both arbors.
If a rounded arbor is detected, replace with hub
and pulley assembly, PN 1135619.
CAUTIO N: 1135619 is an I/O part number.
Do not use standard IISelectric
li
hub and pulley
assembly.
h. Worn cyc Ie clutch latch or the bond betwee~
meta I clutch stop and the rubber shock absorber
on clutch latch is breaking loose.
15.6 CYCLE CLUTCH PULLEY AND HUB ASSEMBLY
The Cycle Clutch Pulley' 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 oversi ze .
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 remova
I of the cyc Ie shaft is necessary on any
Selectric I/O Printer, the cycle clutch pulley should