MIL-P-18111A(SHIPS)
3. REQUIREMENTS
3 . 1 M a t e r i a l s . - Unless otherwise specified herein the materials of parts shall be of a high grade com-
mercial standard, suitable for the purpose intended, under conditions of temperature and shock specified
herein Choice of materials shall be such that the parts will not gall, corrode or stick after periods of in-
activity at temperatures specified in 3.8. Cast iron shall not be used.
3.2 P u m p . -
3.2.1 Design. - The hydraulic pump shall be a rotary, positive displacement crank operated type for
clockwise rotation The pump shall be provided with mounting lugs or brackets for bolting to the ship struc-
ture.
3.2.2 P e r f o r m a n c e . - The hydraulic pump shall be capable of a discharge pressure of 350 and 900 pounds
per square inch (p.s.i.), with a crank speed of 60 revolutions per minute (r.p.m.), and crank input torques of
42 and 83 foot-pounds, respectively.
3.3 Motor. -
3.3.1 Design. - The motor shall consist of an assembly with inlet and outlet ports and having the drive
shaft projecting or connection to a valve stem or gear unit for driving a valve stem High pressure hydraulic
fluid shall enter through the motor inlet causing the drive shaft of the motor to rotate and shall pass out
through the motor outlet at a low pressure. Motor reversal shall be accomplished by the use of a four-way
selector cock which diverts the fluid to the desired port of the motor and shall be located in the hydraulic
system near the pump.
3.3.2 P e r f o r m a n c e . - With relet pressures at 350 p.s.i. and 900 p.s.i the output torque of the motor
drive shaft shall be not less than 30 foot-pounds and 60 foot-pounds respectively with the fluid temperature
not less than 50°F.
3.4 Housings. - Pump and motor housings shall be designed for a working pressure of 750 p.s.i. Test
pressure shall be 1000 p.s.i
3.5 Fittings. - Hydraulic connections for both pump and motor housings shall conform to Drawing 5000-
S4824-1385775.
3.6 Pump crank. - The crank shall be a design having an effective radius of 10 Inches, with an 8-inch
handle for applying both hands. The crank shall be easily detached and shall incorpo r a t e a hub which latches
to the pump drive shaft while in use.
3.7 Seals. - Pump and motor shall be provided with adequate seals around the shaft bearings and at all
other joints or openings to prevent leakage of hydraulic fluid out of the unit when subjected to an internal
hydraulic pressure of not less than 1000 p.s.i.
3.8 Operating temperatures. - The hydraulic units shall operate satisfactorily for all temperatures of
the hydraulic fluid from 50° to 200°F.
3.9 Hydraulic fluid. - The hydraulic fluid used in this equipment shall be in accordance with symbol
2135 T-H of MIL-L-17672.
3.10 Shock resistance. - The pump and motor shall not become inoperative or sustain damage when sub-
jected to the test specified in 4.5.6.
3.11 Marking. - Each unit shall be permanently and legibily marked with an identification plate conform-
ing to type A, B, or C C of MIL-P-15024, with the manufacturer's name or trademark, type or model number
and the Federal stock number.
3.12 Manuals. - Manuals shall be type I in accordance with MIL-M-15071 (see 6.2)
3.13 Onboard repair parts. - One set of gaskets, packing and seals shall be supplied as onboard repair
parts with each two hydraulic units.
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