MIL-S-45152H
continuous full width ramp and loading approach to the semitrailer deck. A locking arrangement shall be provided to enable the gooseneck to be held erect in a fixed gooseneck position.
3.8.4.1 Hydraulic folding gooseneck. Class D folding gooseneck semitrailer shall be furnished with a hydraulically operated folding gooseneck mechanism and a self-contained hydraulic power system. Folding and unfolding operations shall be capable of being performed without outside power or mechanical assistance. Means shall be provided to prevent damage to the kingpin with the gooseneck in the prone position. Any locking pins shall be of the captive type or shall be secured to the semitrailer with corrosion-resistant chains or cables. A
self-contained hydraulic system shall be installed on the semitrailer.
3.8.4.2 Hydraulic system. The hydraulic system shall consist of an engine, hydraulic pump, hydraulic cylinders, hydraulic fluid reservoir, control and relief valves, filters, hoses, piping, fittings and all other components required to actuate and control the hydraulically powered gooseneck (and for class D, the landing legs, when landing legs are furnished). The cylinders shall be designed to travel slower in the lift mode than in the retract mode.
3.8.4.3 Hydraulic pump. The hydraulic pump shall be capable of delivering a flow rate at maximum system operating pressure which is adequate to provide for a minimum system flow rate of 3 gallons per minute (gpm).
3.8.4.4 Hydraulic fluid and filter. A full-flow hydraulic filter, having a filter rating no
greater than 25 microns shall be installed in the hydraulic system. The hydraulic fluid shall be of
a noncorrosive type with characteristics to withstand a temperature range from minus 40 to plus 275 degrees Fahrenheit ( F). The hydraulic fluid shall conform to SAE standards.
* 3.8.4.5 Hydraulic reservoir. The hydraulic reservoir shall have sufficient capacity to hold the maximum volume of fluid required for the system plus a minimum of 20 percent reserve. Further, in no case shall the reservoir capacity be less than four gallons. The reservoir shall be vented by a separate vent or through the filler cap. The vent shall be fitted with a filter element. A corrosion-resistant plate conforming to composition A (class l or 2) or composition C of
MIL-P-514, indicating the type of hydraulic fluid to be used, shall be installed near the filler cap.
3.8.4.6 Hydraulic lines and fittings. All hydraulic tubing, hosing, and fittings shall conform to applicable SAE standards. A minimum number of fittings, joints, and connections shall be used to prevent excessive back pressure, clogging, and leakage. All hoses and fittings shall be capable of withstanding a bursting pressure of four times the working pressure and a maximum proof pressure of at least two times the working pressure. Hoses shall have physical qualities equal to or conforming to SAE J517 (100 R1), as applicable. Hoses shall be protected against chafing through utilization of supports and protective devices.
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