(l) Install the worm shaft collar (27) on
(i) Install the terminal lug (17) with its
the end of the worm shaft (21) and
attached wire on the needle
secure it in place with the setscrew
assembly (15) and secure it in place
with the screw (18).
(j) Install the balance orifice holder
If previously removed, install the
setscrew (28) and secure it in place
with glyptal. This setscrew serves as
a stop and must protrude so that it
26. Motor and Pump Assembly
will strike the stop shaft (25).
a. Description and Function. The motor and pump
(m) Install the calibrator bracket (16)
assembly (fig. 6), a subassembly of the chassis
with its assembled parts on the
calibrator housing (8). Secure with
assembly, draws a vacuum or furnishes pressure to the
four flat washers (35), lockwashers
calibrator assembly and provides a supply of air to the
(36), and screws (37).
solenoid valve L3. Depending upon the position of the
selector valve (45), the indicator will operate under
(a) Position the calibrator assembly on
vacuum or pressure. In the vacuum position, air is
the chassis base making certain that
drawn from the calibrator assembly through the bleeder
the worm shaft (21) extends through
housing and into the blower through the elbow (14) at
the hole marked CALIBRATE on the
the side of the selector valve. At the same time air is
(b) Secure the calibrator housing (8, fig.
forced through the rubber tubing (9) and to the
14) to the chassis base with two
atmosphere through the orifice filter (4). In the pressure
position, air is drawn through the orifice filter (4) into the
(c) Connect the copper tube (39, fig.
blower and then is under pressure through the rubber
tubing (9) and the elbow (14) at the side of the selector
its tube coupling nut.
valve to the calibrator assembly. The impeller (16)
rotates in but one direction. However, the direction of
the stream of air is determined by the position of the
Before installing any threaded pipe
selector valve, and this enables the indicator to operate
connection, apply lead compound
under a vacuum or pressure condition. Rotational speed
around the threads to form a seal.
of the impeller is controlled by the limitations of the
motor. Should it become impossible to build up a one-
(d) Connect the copper tube (14, fig. 3)
inch pressure even after bleed air has been decreased
tube coupling nut.
as far as possible, the motor speed may be increased by
(e) Connect the copper tubing (57, fig.
tube coupling nut.
(f) Install the shaft lock (37, fig. 3) over
At the other end of the motor, a reciprocating pump is
driven through a reduction gear box.
secure it in place to the front panel
furnishes air through the plastic tubing (23) to the
(36). Tighten the shaft lock (37).
solenoid valve L3 where the air is passed on to the
(g) Install the knob (6) over the end of
component under test for conditioning purposes. The
pump operates continuously; however air is cut off from
position the threaded hole in the
the outlet valve under test when the solenoid valve L3 is
knob over the fiat portion of the
energized by the interval timer M1.
shaft. Secure the knob to the shaft
(h) Install the terminal lug (7, fig. 14)
with its attached wire on the
calibrator housing (8) and secure it
in place with the screw (6).