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|  MIL-T-52843C
hydraulic fluid shall not exceed 100 F above the ambient during all
operations and tests specified herein. Hydraulic fittings on pumps,
valves and cylinders shall be either the O-ring, straight thread
type, as specified in SAE J514 or the 4-bolt flange type as specified
in SAE J518 for 1 inch and smaller, and only the 4-bolt flange type
as specified in SAE J518 for ports larger than 1 inch. The hydraulic
system shall be flushed free of foreign matter including weld slag
and spatter. The connection ports of the hydraulic components shall
be sealed by the component manufacturer. In event of failure or
damage to the hydraulic system, a means to prevent the forks from
tilting, or the frame (forks) from oscillating shall be provided. 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.
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, maximum protection and provision shall
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, return lines and cylinder
bleeder lines, shall be considered pressure lines. All lines shall be
flushed free of foreign matter including weld slag and spatter.
3.12.1.1 Pressure hose assemblies. Pressure hose shall be as
specified in SAE J517 or MIL-H-52471. Permanently attached type
pressure hose couplings are acceptable as original equipment hose
assemblies. The truck 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:
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