TM 1-1520-238-23 1-117 1.36. UTILITY HYDRAULIC ACCUMULATOR SERVICING – NITROGEN – continued WARNING The utility hydraulic accumulator con- tains high pressure nitrogen. Open and close valve carefully to prevent possible injury from sudden blast. If injury occurs, seek medical aid. i. Vent utility hydraulic pressure (para 7.57). j. Connect nitrogen truck service hose (7) to valve (8). (1) Remove cap (9) from valve (8). (2) Hold valve (8). Loosen nut (10). Do not allow pressure to escape. (3) Install service hose nut (11) on valve (8). k. Service utility hydraulic accumulator accord- ing to specifications on chart (12). (1) Loosen nut (10) until resistance is felt; then loosen 1/2 to 3/4 turn to off seat valve. (2) Select correct pressure from chart (12) ac- cording to temperature. (3) Tighten nut (10) when gage (13) reads cor- rect pressure. NOTE Allow pressure to stabilize 5 minutes. Ad- just pressure if necessary. GO TO NEXT PAGE 11 13 9 10 8 M04-1621-1 8 13 7 +105 TO +115 +115 TO +125 +125 TO +135 +135 TO +145 +95 TO +105 +85 TO +95 +75 TO +85 M04-1621-3 1775-1825 1805-1855 1745-1795 1625-1675 1715-1765 1685-1735 1595-1645 1655-1705 1565-1615 1505-1555 1535-1585 1474-1525 1415-1465 1445-1495 1385-1435 -45 TO -35 1355-1405 -55 TO -45 -35 TO -25 -65 TO -55 1325-1375 1835-1885 1295-1345 1265-1315 1235-1285 -25 TO -15 -15 TO -5 -5 TO +5 +5 TO +15 +15 TO +25 +25 TO +35 +35 TO +45 +45 TO +55 +55 TO +65 +65 TO +75 13 12 OUTSIDE AIR TEMPERATURE (ºF) NITROGEN PRESSURE (psig)