MIL-DTL-3124E(SH)
3.3.8.2.6 Bearing seals. The housing shall provide a close-clearance metallic seal (non-rubbing) on both sides
of the bearings (one side only where shaft does not extend through cap) to prevent leakage of oil or grease along the
shaft.
3.3.8.2.7 Housing construction. The bearing housing shall permit removal of the end bracket without removing
the bearings.
3.3.8.2.8 Addition of grease lubricant. When grease is the lubricant used, the correct amount, in accordance
with S9086-HN-STM-010/244, shall be added to the bearing housing before the generator leaves the place of
manufacture.
3.3.9 Shafts. When oil lubrication is used, shafts shall be provided with deflecting flanges or slingers to
minimize the passage of oil into the bearing seal cavity (see 3.3.8.2.6). Generators shall be provided with a shaft
extension for the prime mover as specified (see 6.2).
3.3.10 Rotors. Keys, in conjunction with press fits or shrink fits, shall be provided to prevent movement of the
core or spider on the shaft. Axial displacement shall be prevented under operating or test conditions. A pin through
the shaft shall not be used to prevent axial displacement. Welding shall not be used to secure the core or spider to
the shaft. Spiders constructed of individual flutes welded to the shaft may be used if pre-heat and stress-relieving
procedures are employed in accordance with S9074-AR-GIB-010/278, Class M-1.
3.3.11 Connections and terminals. Connections and terminals shall be as specified in 3.3.11.1 through 3.3.11.9.
3.3.11.1 Wiring connections. Main generator power terminals shall be located as specified herein, and shall be
installed within a dripproof-protected enclosure as specified (see 3.3.4). The enclosure shall be located on the side
of the generator to allow side entry of cables to generator armature output. Except for generator armature output and
field input power terminals, electrical items which require connections to ship s wiring shall be wired to terminal
boards which shall be enclosed, dripproof-protected, and conveniently located. Separate connection boxes or
separate enclosed compartments within a common connection box shall be provided for each of the auxiliary
services which require connection to the ship s electrical wiring, such as space heaters and temperature detectors.
Connection boxes for space heater wiring shall be provided with a warning plate which indicates that heaters are
energized when the generator is de-energized. Wiring between parts, such as field coils and terminal boards, shall
be in accordance with MIL-E-917 and shall be arranged for convenience of maintenance and repair accessibility.
3.3.11.2 Securing connections. Connections shall be provided with locking devices in accordance with
MIL-E-917. Connectors and leads shall be secured to prevent contact with moving or stationary parts. Excess
solder shall be removed from soldered connections.
3.3.11.3 Bus bar leads. Bus bar leads shall be silver plated using 99.9 percent pure silver. The silver thus
applied shall be not less than 0.0002 inch thick and shall withstand the adhesion test in accordance with
ASTM B700 and shall show no tendency to peel. The contact surfaces of the bus bars shall be silvered, as a
minimum, 1 inch past the joint area. The entire bus bar may be silver surfaced at the discretion of the manufacturer
or NAVSEA.
3.3.11.4 Generators with frame sizes not greater than 10 kilowatts at 1800 r/min. A lead clamp shall be
provided for the terminal leads. The terminal leads shall not be attached to the end brackets but shall be attached to
the frame and extend to at least 6 inches beyond the point of support. The methods of fastening shall prevent strain
from the outside from being transmitted to the connections within the generator frame. Unclamped rubber bushings
shall not be used for securing leads. The ends of each generator lead shall be fitted with a connector in accordance
with MIL-T-16366. Terminal lead holes in the generator frames shall have rounded edges to prevent injury to lead
insulation.
3.3.11.5 Generators with frame sizes not less than 10 kilowatts and not greater than 25 kilowatts at 1800 r/min.
Leads shall be brought to and terminated at a terminal board.
3.3.11.6 Generators with frame sizes not less than 25 kilowatts and not greater than 200 kilowatts at
1800 r/min. Leads shall be brought to and terminated at a terminal board which shall be located on the side of the
frame below the horizontal axis. The terminal board shall be located to facilitate connections and shall
accommodate the ship leads from below.
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