OP-755 Part 2 Pages 197-401 - Personal Page of GENE SLOVER

271
continuous operation, it is necessary to operate
the equipment at a much slower speed,
than when using "Servo Electrical" or "Servo
Mechanical" control.
In order to train the crew in this method of
operation, a control pump by-pass valve has
been provided. This permits the control pump
to be by-passed to the tank to simulate a control
pump failure.
Shifting to "Manual" is accomplished by moving
the control selector lever to the "Mechanical
Control" position and then the control pump
by-pass valve and servo valve locking device
lever to the "Manual" position. See further
reference in the description of the control
circuit.
(f) Power fa i Zur e . - Means have been provided to
apply brake and stop the hoist regardless of
the position of the control levers ~ if power
fails.
Detail Description of Power Units
37. Mechanical arrangements and specification data for
the power units which provide the above indicated operation and
control are as described below, paragraphs 38-48.
38. Electric motor. - The electric motor is a power unit
of commercial design and manufacture (Louis Allis Co.). It
is a vertical shaft type with downward output centered in a
flange mounting pad located on top of the box gun girder immediately
over the A-end shaft. The two shafts are coupled
wLth a short conriecting shaft and two flexible couplings (Fast
type). Hotor specification and performance data are as follows.
Motor Data
Type: - Squirrel cage induction; 440 volts,
60 cycle, 3 phase; vertical mounting;
fan-cooled; waterproof enclosure.
Horsepower- - - - - - - - -75 (overload rating 135)
Speed - - - - - - - - - ~ - - - - Constant
H.P.M., full load - - - - - - - - - - - - - - -1760
Amperes, full load- - - - - - - - - - - - - 90
Weight, pounds- - - - - - - - - - - - - - -1525
Lubrication - - - - - - - - Grease cups
Manufacturer's type designation - - - - - RX-505-C
General arrangement drawing - - - - - - - 231701