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|  MIL-C-53057(ME)
requirements as stated therein. The filter shall maintain a full flow
condition for the duration of reliability testing as specified in
4.6.2.30. The filter bypass may open for system oil at a temperature
less than 70 F. The filter element shall have been tested to the
performance requirements of MIL F-52723 at a flow rate equal to or
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greater than the crane maximum system oil flow at maximum governed
engine speed. All return oil shall pass through the filter except
relief oil which may return directly to the reservoir. The filter
shall be located so that the element may be removed, without removal
of other components, for examination or replacement without spilling
or draining oil from the reservoir. At the maximum system oil flow
through the filter, all valves in the neutral position, at maximum
governed engine speed and an oil temperature of 150 F 5 F, the
pressure drop across a new filter assembly shall not exceed 10 psi.
An automatic bypass shall be provided in the system filter and shall
open at not less than 10 psi greater than thc pressure drop measured
across the new filter assembly and it shall permit full flow at a
pressure drop not greater than 35 psi. The filter housing shall have
a minimum proof pressure of 100 psi without permanent deformation,
damage, or leakage. The system filter shall be equipped with a
contamination indicator which may be remotely mounted. The indicator
shall be clearly readable without the removal of any components. As a
minimum, the indicator shall show when the filter clement is clean
and when the system filter is beginning to bypass, requiring a change
of the element.
3.12.3.2 Pressure filter. The pressure filter(s) shall conform to
3.12.3.1 except that proof pressure test shall be 150 percent of the
maximum system operating pressure.
3.12.4 Reservoir. A hydraulic reservoir shall be furnished to
contain the hydraulic system oil. The reservoir shall include a
filler opening, screen, cap, and other items required to function as
specified herein. The reservoir shall be mounted to prevent
vibrations that could result in leaks, loosening of fasteners,
brinelling of material, or cracks. The location shall not impair
operational visibility or access to either side of the operator's
compartment. The reservoir shall have sufficient capacity to prevent
air entering the system with all hydraulic pistons fully extended and
sufficient free air capacity to prevent oil being discharged through
the reservoir air vent when maximum return flow of oil is surged into
the reservoir from the system. The Add and Full marks on the dipstick
or sightglass(s) shall be in accordance with SAE J614b and indicate
the correct oil level when the crane is on level ground, and the oil
is at normal operating temperature. The fillercap and tube shall be
located to provide for filling from a standard 5 gallon container
conforming to MIL-C-1283 by a person standing on the ground or a
surface on the crane intended for standing, and to prevent entrance
of contaminants throughout filling and checking operations. The
reservoir filler neck shall contain a removable 50 mesh, or finer,
strainer retained in place. The filler tube labeled "hydraulic fill"
shall be not less than 1-inch inside diameter. The re ervoir pump
s
inlet line suction openings except for the auxiliary steering pump
opening, shall be located a minimum of 1.25 inches above the bottom
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