Carrier Return

SYMPTOM

POSSIBLE CAUSE

REMEDY

REMARKS

Machine will not carrier return.

1. Carrier binding on dust cover (12-1).

Remove binds

Dust covers may have to be readjusted.

2. Torque limiter extension spring off or broken (96-17).

Replace spring. (Replacement spring must be correct tension)

The extension spring applies correct tension for carrier return and also allows the torque limiter spring to slip when carrier is at the left margin.

3. Oil on carrier return spring (31-31).

Flush oil off spring with cleaning solution. Spring should not be oiled.

If carrier return problems persist - change carrier return spring.

4. Carrier return spring clip missing.

Replace clip (96-18).

5. Transport cords off pulleys.

Replace cords on pulleys and check cord tension pulley (19B-29)

6. Carrier return keylever pawl is overlapped on the wrong side of the index keylever pawl.

Reposition carrier return keylever pawl (18-12) on the correct side of index keylever pawl (18-13).

7. Adjustment screw for carrier return clutch

arm loose or missing (97-19)

Reposition pivot pin (97-20) and tighten screw (97-19).

8. Spring between clutch arm (97-19) and actuating arm (96-21) broken or missing.

Replace

9. Too much carrier return shoe clearance (31-33).

Adjust screw (31-34) for clearance between carrier return spring

10. Carrier hitting against a tab stop.

Usually happens with the silicone tab rack.

Replace silicone tab rack with friction.

11. Carrier return latch will not go under cam

follower.

Adjust carrier return latch screw (97-24) so latch (97-22) will go under cam follower (97- 23).

12. Check carrier return interposer for damage.

Repair or replace interposer (19-3).

13. Carrier return keylever pawl broken (18-12).

Replace

14. Cam follower worn or broken.

Replace

Carrier oscillates back and forth.

1. Grease or oil on carrier return spring (31-31).

Flush carrier return spring with cleaning fluid.

Carrier return spring should not be lubricated. If failure continues replace carrier return spring.

2. Extension spring missing or damaged.

Replace extension spring (96-17).

Must be replaced with correct spring.

3. Too much carrier return shoe clearance (31-33).

Adjust carrier return shoe clearance (31-33) with adjusting screw (31-34).

4. Clip on carrier return spring missing or damage

Replace spring clip (96-18).

Carrier does not return all the way to the left hand margin.

1. Carrier binding on dust cover (12-1).

Remove binds

Dust covers may have to be formed or readjusted.

2. Clutch latch overthrow

Adjust clutch latch (99-27) to

overthrow keeper (99-26).

1. Overthrow adjustment should

be enough to ensure latch up.

2. When checking overthrow, be

sure platen is installed.

3. Worn latch keeper

Replace keeper (99-26)

4. Cords off pulleys.

Replace cords on pulleys

Also check cord tension pulley

for proper adjustment.

5. Carrier return tab interlock maladjusted.

Adjust interlock for clearance (99-28).

Rotate interlock clip (100-29) radially for clearance between clip interlock (100-29) and tab interlock (100-30)

Tab interlock restricts carrier

return latch keeper (99-26) from

moving towards rear, this pre

vents- the keeper(99-26) from

latching up carrier return latch

(99-27).

6. Spring missing or broken on latch keeper.

Replace spring (99-31) on latch keeper.

7. Damaged or weak extension spring (96-17) on torque limiter.

Replace

Carrier return jams or hesitates at left margin.

1. No clearance between

express backspace shoe

(34-36) and carrier re

turn spring (31-31).

Adjust bellcrank (33-40) by

forming to obtain shoe clearance

Selectric II typewriter only.

Uneven left hand margin.

1. Carrier binding on dust

cover (12-1).

Remove binds

Dust covers may have to be

formed or readjusted.

2. Carrier indicator binding

on top cover.

Adjust indicator up or down on

front of carrier to prevent binds.

Red Carrier indicator shows the

position of the carrier.

3. Overbank

Adjust bellcrank (101-32) back

and forth for even left hand margin

4. Velocity cable binding on

cord pulleys.

Adjust velocity cable (70-40) to

just contact the left inside of

machine when carrier is at ex

treme left side of machine.

5. Carrier return clutch

unlatching hesitates.

Rotate clevis (101-33) to adjust

for correct amount of latch bite

(99-27) .

Latch bite effects clutch unlatching

6. Carrier return shoe

clearance.

Adjust screw (31-34) for clearance

between carrier return spring

(31-31) and shoe (31-33).

7. Cords off pulleys.

Replace cords on pulleys.

Check cord tension pulley.

8. Escapement pawl worn.

Replace pawl (73-43)

If pawl is replaced, check escapement rack also.

9. Escapement rack worn.

Replace escapement rack (73-44)

If escapement rack is replaced,

check escapement pawl also.

10. Too much pawl clearance during carrier

return.

Form clutch latch (99-27) for

minimum escapement pawl clear

ance during carrier return.

11. Torque limiter spring

broken or maladjusted.

Replace torque limiter spring

(96-30).

Lubricate torque limiter spring

with grease

12. Too much tension on

mainspring (17-1)

Mainspring should be wound clock-

wise approximately 6 turns.

Too much mainspring tension

(17-1) may not allow carrier to

return to left hand margin.

Carrier return

gets extra cycle

1. Carrier return keybutton

binding on cover.

Adjust keybutton by forming or

adjust machine within covers.

Adjust machine foot brackets

(65-30)

2. Interposer latch plate

worn or maladjusted.

Replace latch plate (30-28)

3. Keylever restoring spring

off or damaged.

Replace spring (66-32).

4. Not enough bite on clutch

release arm.

Adjust function cams (95-15) to

the left to provide more bite.

5. Interposer restoring bail

maladjusted.

Adjust restoring bail (29-26) by

forming adjustable lugs (29-27)

so interposer (19-4) will overthrow latch plate (30-28).

6. Check keylever pawl

overlap and clearance.

I. Adjust overlap of carrier re-

turn pawl (18-12) and interposer

by adjusting screw (18-14)

Overlap approximately .040"

2. Adjust  .025" clearance between

keylever pawl (18-12) and

interposer with "U" slot in

carrier return keylever.

Carrier return

noisy.

1. Escapement pawl dragg

ing on escapement rack.

Form clutch latch (99-27) for

minimum escapement pawl clear

ance during carrier return.

2. Velocity cable rubbing

against carrier (70-40).

A certain amount of velocity cable

noise is permissable.

3. Tab gang clear bracket

rubbing on tab rack.

Adjust gang clear bracket (92-34)

to minimize noise.

4. Cords off pulleys

Replace cords on pulleys and

check cord tension pulley.

Carrier return

jams or hesitates at left margin.

1. Carrier binding on dust cover (12-1).

Remove binds

Dust covers may have to be formed or readjusted.

2. Not enough carrier return shoe clearance.

Adjust screw (31-34) for clearance between carrier return spring (31-31) and shoe (31-33).

3. Clutch unlatching maladjusted.

Adjust clevis (101-33) for correct amount of latch bite (99-27) .

Proper latch bite prevents hesitation when carrier return is released.

4. Overbank

Adjust bellcrank (101-32) back and forth for even left hand margin

Lubricate mechanism.

5. Carrier return pinion spring damaged (31-31)

Replace

Check for bad loop in carrier return spring (31-31).

6. Broken torque limiter spring or extension

spring.

Replace torque limiter spring (96-30) or extension spring (96-17)

Lubricate spring (96-30)