Carrier Return - IBM Selectric Maintenance Manual

No
Check Cam Release Lever and Lug 6.4
Binds or Rust on Cam or Release Lever
Interposer Spring Off Or in Wrong Hole
Wrong Spring 1 .11
Keylever Pawl Spring
?ee Out ut Mode
Check:
Latch
Cam Follower Is Broken
CARRIER RETURN
No
Carrier Return Latch Eccentric Stud Off or Loose.
Figure 6.0
6.0
6.1
6.2
6.3
6.4
6.5
CARRIER RETURN
Carrier Return Adjustments
With the Margin Rack held to the left, adjust the
unlatching link so that the keeper clears the actuat-
ing arm by .005" - .015".
Adjust for a minimum of .010", maximum of .020"
clearance between the C/R Shoe and the Spring
Clutch. Note: The Carrier Return Spring Clutch
Clamp may be off or broken.
Adjust the Carrier Return Arm Screw for .030"-.040"
overthrow between the latch and the keeper with the
C/R Cam on the high point. The latch overthrow is
affected by platen load; therefore, insure that the
Platen is installed when making this adjustment.
With the interposer and cam latched, the release arm
lug should clear the interposer by .025" - .035".
Binds -Check the following:
a. Feed Roll Mounting Arm hits the Tab Overthrow
Stop.
b. Dust Covers - Card Holders.
c. Anvi I and Front Carri er Shoes.
d. Rear Carrier Shoe.
e. Escapement Cord is off its pulley.
f. Pinion Gear.
6.6
6.7
6.8
6.9
4-10
Yes
No
No
Carrier Return Latch To Keepe, Clearance 6.1
Carrier Return Latch Overthrow
6.3,
6.10
Broken Spring Clutch
Left Margin 6.6
Nylon Shoe To Spring Clutch Clearance 6.2
An uneven left margin may be caused by:
a. The Clutch Unlatching Link being too short.
b. The overbank adjustment.
c. A worn Escapement Pawl. (Fig. 3.1)
S.H.
The Tab Governor Spri ng Clutch must be free of
rust, di rt, and excess oi I. Too much oi I wi II cause
the clutch to bind or drag.
The Carrier Return Pinion and Spring Clutch must
a Iso be free of rust, di rt and oi I. Excess oi I wi II
cause sluggish Tab and Escapement operation.
S. H. TORQUE LIMITER
Adjust the Extension Spring for I - 2 lb. of tension
on the Carrier, whi Ie holding the Carrier against a
carrier return operation.
If
the Torque Limiter
Spring appears to ride off the right side of the arbor,
replace the Extension Spring with a spring P/N
1115382 and read just.
S. H. CARRI ER RETURN FAI LURES
Some partial return failures can be traced to a
rounded edge on the CR latch. If this problem is
experienced, replace the latch, PN 1128168. Cur-
rent producti on latches have been reworked to
eliminate this possibi lity.