Teletype 28 - 3.55 Timing Contact Mechanism (Operated by Selector)

ISS 8, SECTION 573-118-700TC
3. 56 Timing Contact Mechanism (Operated by Selector) {continued)
(Left Side View)
CAM
(H)
CONTACT ASSEMBLY POSITION
(1) Requirement
Set range scale at 50 (important).
Rotate shaft so operating lever is
on lowest part of cam.
y
BRACKET To Adjust
MOUNTING SCREWS With mounting screws loosened
e
I
I
..
,.
JT- ·~:
~
I
position contact assembly by
means of its oversize mounting
holes so lever can be moved
....------Min 0. 002 inch
Max 0. 006 inch
before it touches the swinger
spring, and so first touch is on
lower half of spring stud
wearing plate.
{2) Requirement
(At higher settings, movement
will be larger; disregard) .
Tighten screws and recheck.
Rotate shaft and note the high
part of cam causes both "M"
contacts to move at least
Min 0. 012 inch.
If this contact movement is not
met at setting 60 and 90, check
for insecure parts and refine
contact gap between swinger and
make contact. If still not met,
replace range scale selector rack.
(G) ALIGNMENT OF OPERATING
LEVER WITH CAM
(1) Requirement
~-------------Operating lever's full
(Front View)
(I) OPERATING LEVER SPRING
Requirement
The spring should hold operating
lever against cam with light
pressure. With spring removed
RACKW/HUB
AND PLATE,
SECTOR
Min 2 oz---1\'i~x 3 oz _____ _,
to stretch spring 5/8 inch length.
thickness should ride cam.
Take up all cam endplay
toward selector clutch
drum; all operating lever
endplay (at its bearing) in
opposite direction. Observe
lever and cam for full en-
gagement.
(2) Requirement
Lever should not exert
pressure against face of
clutch disc c
To Adjust
Refine clutch drum endplay
(2. 09).
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