IBM Selectric Maintenance Manual page 72

c. Carrier Return Latch Arm Assembl y Adjusting Screw
(latch arm height) - With the carrier return cam
latched in the rest position, adjust the screw so that
the carrier return latch wi II pass under the cam fol-
lower by .003" to .015" (Fig. 147.4).
Latch Arm Adjusting Screw
.003" To .015"
L
t
FIGURE 147.4 Latch Arm Height Adjustment
CAUTION: Any change in the carrier return latch-
height directly affects the front to rear position of
the latch (with respect to the cam follower) when
the machine is at rest. See adjustment #4 in the
Operational Control Section.
.3. Carrier Return Shoe - The carrier return shoe must be ad-
justed for two conditions:
a. Overlap - Adjust the carrier return actuating arm
bracket left or right so that the carrier return shoe
overlaps the last 3 coils on the right-hand end of
the clutch spring. Covering the last 3 coil-s ensures
that all the coils of the spring will be used in the
clutch operation (Fig. 147.5).
Shoe Overlaps
Last 3 Coils
Carrier Return
Actuating Arm
Bracket Assembly
FIGURE 147.5 Carrier Return Shoe (Overlap)
b. Clearance - The nylon shoe on the clutch actuating
arm should clear the carrier return cl utch spring by
.015" to .020" when the machine is at rest (Fig.
147 .6). Adjust the screw on the clutch arm to ob-
tain proper clearance.
FIGURE 147.6 Carrier Return Shoe (Clearance)
"
NOTE: In no case should the shoe to clutch spring
.. !
clearance be less than .015".
4. Ov';;;bank Adjustment - With the carrier resting at the
left margin stop, adjust the margin rack overbank guide
(Fig. 147.7) left or right on
t~e
margin rackt6 obtain
a clearance of .001" to .005" beMeenthe stojllatch
on the carrier and the left-hand margin sfop; "Orr ma-
chines equipped with a floating stop latch, the floating
action of the latch must be removed, by pulling the
latch to the right with a spring hook, before this clear-
ance can be observed.
2-45.1
Margin Rack
FIGURE 147.7 Margin Rack Overbank Guide Adjustment
The adjustment of the overbank guide on the margin rcick
determines the rest. position of the margin rack. The ad-
justment ensures that the left margin stop wi II set ac-
curately when the stop is slid to the right against the
margin stop latch on the carrier. In addition, the ad-
justment of the overbank guide, plus the amount of
lateral motion that the guide permits the rack (due to
the design of the guide) when the carrier moves into
the left-hand margin during a carrier return operation,