AT&T Bell System Plant Series Adjusting Manual page 2

SECTION 075-180-703
a nonpolarized plug has been replaced by the
KS-14377 131, 25-foot, 3-wire cord, equipped
with a parallel blade 3-conductor grounding type
plug. The KS-14377 L3 and L4 vacuum cleaners
may be updated to the equivalent of the 15
and L6 by replacing the 2-wire cord with the
3-wire cord. See Section 075-180-803.
The KS-14377 12, L4, and L6 vacuum cleaners
have several motor refinements which reduce
operating noise. These three types are referred
to as silent vacuum cleaners. The KS-14377 11,
L3, and L5 do not have these refinements and are
referred to as standard vacuum cleaners .•
1.04
Reference shall be made to Section 020-010-711
covering general requirements and definitions
for additional information necessary for the proper
application of the requirements listed herein.
1.05 Asterisk(*):
Requirements are marked with
an asterisk when to check for them would
necessitate the dismantling or dismounting of the
apparatus, or would affect the adjustment involved
or other adjustments.
~o
check need be made
for these requirements unless the part is accessible
for other reasons or its performance indicates that
such a check is advisable.
1.06 Satisfactory commutation,
for the purpose
of this section, may be said to have been
attained if neither the brushes nor the commutator
are burned or damaged to the extent that abnormal·
maintenance is required. The presence of some
visible sparking is not necessarily evidence of
unsatisfactory commutation.
2. REQUIREMENTS
2.01 Cleaning:
The vacuum cleaner shall be
cleaned when necessary.
*2.02 Motor Brush Length:
The length of the
brushes shall be
Min 318 inch
Use the R-8550 scale.
To check this requirement remove the brushes as
covered in 3.003(1).
~Ieasure
the brush length from
the inner end of the brush spring to the top of
the arc in the brush face. If both brushes meet
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the requirement, remount the brushes as covered
in 3.003(2).
2.03
Motor Commutator: The surface of the
commutator shall be free from scoring,
pitting, or other deformation of the surface or
structure.
Gauge by eye.
2.04
•Frame Grounding:
There shall be continuity
between the grounding blade of the power
cord and the frame of the vacuum cleaner. •
3. ADJUSTING PROCEDURES
3.001 List of Gauges and Materials
CODE OR
SPEC NO.
GAUGES
R-8550
MATERIALS
KS-7860
KS-14666
KS-14510
DESCRIPTION
6-Inch Scale
Petroleum Spirits
Cloth
Multimeter (or equivalent)
3.002
Removing and Remounting Cleaner Head:
To remove the cleaner head from the dust
container proceed as covered in (1), and to remount
the cleaner head proceed as covered in (2).
(1) Before removing the cleaner head, disconnect
the vacuum cleaner from the power supply.
Loosen the two screw clamps on opposite sides
of the head by turning out the knurled screws
with the fingers. Disengage the clamp hooks
from the rim of the container and remove the
head from the container using the clamps as
handles.
(2) Position the cleaner head in the dust container.
If it is necessary to turn the head with
reference to the container, lift the head clear
of the felt-cambric filter so that the filter will
nuL be twisted. Engage the clamp hooks in the
rim of the container and then tighten the knurled
screws with the fingers. Make sure that the
cleaner head, aluminum ring, and dust container
are firmly clamped together to prevent leakage
of air which would reduce the suction of the
,