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Starter-Generator Engine STU-6A
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Terminal marking



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MIL-S-26547C
3.4 Design and construction.  The starter-generator shall be so designed
and constructed that no parts will work loose in service and shall be built
to Withstand the strains. jars, vibrations, and other conditions incident to
shipping, storage, Installation, and service.  The starter-generator shall be
so designed that no part can be assembled in reverse position and cause faulty
operation or lead to eventual failure.
3.4.1 Simplication.  Simplicity of design resulting from the use of the
same part for as many applications as possible in a given model is highly
(For example:  Use of identical ball bearing assemblies on both
desirable.
ends of the armature.)
3.4.2 Starter.  The starter shall be designed to operate with series and
shunt fields connected.  The minimum torque delivery of the starter shall
be as specified on Figures 1 and 2 under the conditions specified thereon.
3.4.3 Cenerator.  The generator shall be designed to operate with a
voltage regulator in accordance with MIL-R-6809 or MIL-R-23761.  The generator
shall be connected short shunt.
3.4.3.1 Generator field.  The generator shunt field shall be so designed
that the maximum regulated field current shall be not more than 8 amperes
(amp) and the power to be dissipated by the regulator shall be not more than
90 watts (w).  Accidental closure of the reverse-current relay shall not
reverse the field.
3.4.4 Mounting flange.  The starter-generator mounting flange shall con-
form to AND10262 with slotted mounting holes as specified thereon.
3.4.5 Torsional vibration damper.  Provisions shall be incorporated in
the generator for installation of a torsional vibration damper between the
drive spline and armature.  The vibration damper shall not be furnished
unless specified by the qualifying activity (see 6.2).
3.4.6 Bearings.  The armature in the starter-generator shall be supported
on both ends by sealed ball bearings.  The bearing support on the drive-
shaft end shall be vented to equalize pressure or suction on both sides of
the bearing.  The method of accomplishing this requirement shall meet the
approval of the qualifying activity.  Ball bearings used shall incorporate
contact seals.
3.4.7 Terminal parts.  The terminal block shall be provided with three
3/8-24 studs with UNF-2A threads and two No. 10-32 studs with UNF-3A threads.
Each stud shall be provided with a plain washer and self-locking nut.
Terminals shall be as shown in Table I.  The spacing of the insulating
barriers and 3/8-24 terminal studs shall be arranged to provide for the
installation of terminal lugs having a maximum width of 0.800 inch.  The
design of the terminal block shall not depend on current to be transmitted by
the studs.
4

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