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INSTALLATION OF FULL CYLIN-DERS.- The trailer should be loaded with cylinders while fastened to a towing vehicle. If a towing vehicle is not available, the rear stand should be let down and hand brakes applied so the weight of the cylinders will not cause the trailer to tilt backwards. The retractable swivel wheel should be down if the trailer is not hooked to a towing vehicle. (When the trailer is hooked to the towing vehicle, the swivel wheel should be retracted.) Cylinders should be loaded from the rear and should be handled with safety caps in place. Standing cylinders should be brought to within 4 feet of the rear end of the trailer. If the cylinders are lying down, the safety cap end of the cylinder should be just below the rear of the trailer. The safety cap end of the cylinder should be lifted or lowered and placed in the appropriate channel. The bottom of the cylinder should be raised and the cylinder worked into place. Ensure that the cylinder is in its forward-most position and firmly seated against the forward cylinder stop. Remove the cylinder safety cap. Position the cylinder so that the cylinder valve outlet may be easily connected to the flexible hose without causing undue strain on the hose. Prior to connecting the hose to the cylinder, open the cylinder. valve slightly to blow any foreign matter from the outlet of the valve; then close the valve. Connect the flexible hose nut to the power cylinder valve. As soon as the cylinders are in place and the hoses connected, the clamping arrangement should be tightened. The bottom four cylinders are clamped in pairs by a wheel, and the top cylinders are tightened by a single strap for each one. After tightening the coupling nuts on the hoses, the hoses should be free of twisting strain. This strain can be prevented by gripping the hose with one hand and twisting slightly in a clockwise direction while tightening the coupling nut. When the nut becomes tight, the hose will twist (counterclockwise) slightly as it seats, and will stop approximately at its neutral position.
Figure 5-13.- Type NO-2 gaseous oxygen servicing trailer (schematic). CAUTION To eliminate the danger of an explosion, do noninterchange parts between oxygen servicing equipment and air/ nitrogen equipment. After replacing the empty cylinders, the cylinder valves on the full cylinders should not be opened until the trailer is positioned for servicing an aircraft.
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