MIL-C-53057(ME)
hydraulic components shall be sealed by the component manufacturer.
In event of failure or damage to the hydraulic system, a means to
prevent the boom from automatically lowering or retracting, and the
load from lowering shall be provided. Means or techniques shall be
provided to allow for
manual override for retracting and lowering the boom and load not in
excess of 10 ft/min and swinging the superstructure in the event of
hydraulic power loss or line failure. A straight thread "O" ring boss
diagnostic port conforming to SAE J514 shall be provided at the
pump(s) outlet or pressure inlet of each control valve. The hydraulic
system shall provide for fluid passage between the carrier and the
superstructure with continuous 360 degree superstructure rotation.
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Hydraulic fittings, hoses, tubing, and linkages shall not be the
lowest portion of the crane and shall be protected by structural
members from striking obstacles.
3.12.1 Hydraulic lines. Hydraulic lines shall consist of tubing,
flexible hose and steel fittings. Hose or a combination of hose and
tubing shall be used between components that are not mounted to a
nonflexing, rigidly connected structural member or rigidly connected
subassembly. All lines shall be routed to provide the minimum number
of bends, ease of maintenance and maximum protec ion. Provision shall
t
be made to prevent damage of lines due to chafing. The hose
installation, such as angle of fittings and location, shall cause no
stress concentration on the hose at the fitting, and the hose shall
be supported, when necessary, to eliminate sagging at the fitting.
All lines, other than suction lines, and cylinder bleeder lines,
shall be considered pressure lines. All lines shall be flushed free
of foreign matter.
3.12.1.1 Pressure hose assemblies. Pressure hose shall be as
specified in SAE J517 or MIL H-52471. Permanently attached type
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pressure hose couplings are acceptable as original equipment hose
assemblies. The crane shall be compatible with hose assemblies with
field attachable reusable fittings in place of each hose assembly
with permanently attached couplings, when tested as specified herein.
All fittings shall be 37-degree flare, female swivel or 4-bolt split
flange as specified in SAE J516. Hose ID shall be limited to 1/4,
3/8, 1/2, 3/4, 1, 1-1/4, 1-1/2, and 2 inches. The hose selected shall
have a rated operating pressure that is greater than the hydraulic
circuit maximum relief valve setting. The hose installation shall not
cause the hose to be bent beyond the minimum bend radius specified in
SAE J517.
3.12.1.2 Pressure tubing. Pressure tubing shall be in accordance
with SAE J524 or SAE J525 and shall meet the requirements specified
herein. Pressure tube sizes shall be limited to 1/4, 5/16, 3/8, 1/2,
5/8, 3/4, 1, 1-1/4, 1-1/2, and 2 inches. Tubing shall have a minimum
burst pressure that is equal to or greater than 3.0 times the system
maximum working pressure. Tubing shall be securely clamped. All bends
shall be smooth without flattening, kinking or wrinkling of the tube.
The term "without flattening" is defined as follows:
Throughout the bend, the tube maximum diameter shall be equal to
or greater than the tube nominal diameter, and the tube maximum
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