IBM Selectric Maintenance Manual page 69

.005" to .020"
Clutch Latch
Eccentri c
---~'-J
FIGURE 140 • . Pawl Clearance Adjustment
b. Carrier Return Latch Arm Adjusting Screw (over-
throw) - With the carrier return cam on the high
point adjust the latch arm adjusting screw (Fig. 14 I)
so that the clutch-Iotch will overthrow the lotching
surface of the keeper by .030" to .040". Be sure
that the platen and feed rolls are installed and the
index selector lever is in the double index position
when checking this adjustr;'ent.
Adj usti ng Screw
Carrier Return
"'"---Latch Arm
FIGURE 141. Clutch Latch Overthrow
Adjustment
c. Carrier Return Latch Actuating Arm Adjusting Screw
(latch height) - With the carrier return cam latched
in the rest position, adjust the screw so that the car-
rier return latch will pass under the cam follower by
.001" to .0lO" (Fig. 142).
CAUTION: Any change in the carrier return latch
height directly affects the front to rear position of
the lotch (with respect to the cam follower) when
the machine is at rest. See adjustment #4 in the
Operational Control Section.
NOTE: On a limited number of printers equipped
with the early style carrier return mechanism, a
carrier return latch actuating arm was used that did
not have a flat surface machined on the left end of
its pivot pin. These early production latch actuat-
ing arms should be replaced before attempting to
make the carrier return adjustments. The flat sur-
face machined on the left end of the pin is required
to establish the proper radial position of the carrier
return lever on the pin (with respect to the latch
actuating arm), and insures that the carrier return
lever cannot slip on the pin.
001" To .010"
Cam Fol
FIGURE 142. Carrier Return Latch Height
3.
Carrier Return Shoe - Adjust the carrier return actuating
arm bracket left or right so that the carrier return shoe
overlaps the last 3 coi Is on the right hand end of the
clutch spring. Covering the last
3
coils insures that all
the coils of the spring will be used in the clutch opera-
tion (Fig. 143).
2-43
Carrier Return
Actuating Arm Bracket
Shoe Overlaps
-~:..:::::u:rrMllirl':
Last Three Coi Is
Clutch Spring
FIGURE 143. Carrier Return Shoe
4. Carrier Return Clutch Arm - Adjust the clutch arm on
the carrier return clutch arm hub so that the formed lug
whi ch mounts the ac;:tuati ng arm stud wi II be hori zonta I
when the machine is at rest (Fig. 144).
5. Shoe Clearance - The nylon shoe on the clutch actuating
arm should clear the carrier return clutch spring by .015"
to .020" when the machine is at r~st (Fig. 144). Adjust
the nut on the actuating arm stud to obtain the proper
clearance.