Figure 8-17.  Fourth Stage Head and Cylinder Group FIGURE PART UNITS USABLE & INDEX NUMBER DESCRIPTION PER ON NUMBER 1  2  3  4  5  6  7 ASSY CODE 8-17 No Number FOURTH STAGE CYLINDER GROUP (See figure 8-12 for NHA) REF (repair kit available) -1 44838 HEAD, Cylinder, fourth stage ........................................................ 1 -2 122433 SCREW, Cap, hex hd, 1/2-13NC x 1-1/2 in Ig (AP) ....................... 8 -3 120384 WASHER, Lock, split, 1/2 in (AP) .................................................. 8 A 28340 GASKET, Cylinder head................................................................ 1 -5 28156 VALVE ASSEMBLY, Fourth stage (repair kit available)................. 1 -6 66493 KIT, Repair, fourth stage valve ...................................................... AR -7 30R1-52-026273 SPRING, Lentiod (24643).............................................................. 4 -8 30R40-035441 RING, Valve (24643) ..................................................................... 1 -9 60-1210 SPRING, Closing (24643) ............................................................. 1 -10 40-035442 DISC, Valve (24643) ..................................................................... 1 -11 28349 GASKET, Valve ............................................................................ 1 -12 144011 PLUG, Pipe, steel, sch, 1/4 NPT ................................................... 2 -13 45222 CYLINDER ASSEMBLY, Fourth stage .......................................... 1 -14 44835 LINER, Cylinder ............................................................................ 1 -15 44837 CYLINDER   .............................................................................. 1 -16 44844 GASKET, Cylinder, fourth stage (see figure 7-12-69 for NHA) ...... REF 68512 KIT, Repair, fourth stage cylinder and piston group....................... AR Component of kit 68512 Component of kit 68512 and 84949 8-34