AT&T Bell System Plant Series Adjustment Procedure

BELL SYSTEM PRACTICES
Plant
Series
SELECTORS
SECTION 026-700-701
Issue
2-D, October, 1956
AT&TCo Standard
60BA, 60BC, 60BP, 60BR, 66A, D-151294, AND D-175279
REQUIREMENTS AND ADJUSTING PROCEDURES
1. GENERAL
1.01 This section covers No. 60BA, 60BC.
60BP, 60BR, 66A, D-151294, and
D-175279 selectors.
1.02 This section is reissued to revise the
requirement for the engagement of hold-
ing pawl and ratchet wheel, to amplify and
revise the requirement for contact spring
position, and to revise the adjusting pro-
cedure for armature lever clearance. De-
tailed reasons for reissue will be found at
the end of the section.
1.03 Reference shall be made to Section
020-010-711 for additional information
necessary for the proper application of the
requirements listed herein.
1.04 One drop of oil, for the purpose of .,
this section, Is the amount of oil
released from a piece of No. 22 bare tinned
copper wire after it has been dipped 1/16
inch into KS-6232 oil and quickly removed •.
.J
)
1.05 Before checking or readjusting to
meet the requirements the equipment
should be taken out of service in accord-
ance with established procedures.
2. REQUIREMENTS
2.01 Cleaning: Parts shall be cleaned
when necessary in accordance with the
procedures covered in Part
3
of this
section.
2.02 Lubrication
(a) The following parts shall be ade-
quately lubricated with KS-6232 oil.
When lubrication is necessary, one drop •
shall be applied to each of the follow-
ing points.
(1) Fig. l(A} - The surfaces of the
rocker arm which come in contact
with the phosphor-bronze pins.
(2) Fig. l(B) - The side of the rounded
end of the holding pawl which makes
contact with the stud.
(3) Fig. l(C) - The teeth of the rat-
chet wheel.
(4) Fig. l(D) - The armature bearings.
NOTE- THE NOS. 66A AND 0-17527\l SELECTORS ARE THE
SAME AS THE SELECTORS SHOWN ABOVE EXCEPT
THEY HAVE TWO RINGING POSITION TERMINALS
AND ARE DESIGNED FOR PLUG-IN CONNECTION
8Y MEANS OF" A JACK ON THE UNDERSIDE OF
THE BASE.
Fig. 1 - No. 60BAl 60BC, bOBP, 60BR,
and D-15 294 Selectors
{See note)
.,
.J
( 5)
Fig. l(E) - The rocker arm bearings.
(6) Fig. l(F) - The ratchet wheel shaft
bearings.
( 7) Fig. 1 ( G) - The stepping pawl bear-
ing pin.
(8) Fig. l(H)
ing.
- The holding pawl bear-
Copyright, 1956, by American Telephone and Telegraph Company
Printed in
q.
s.
A.
Paa• 1