b.Place the handle 10° from OFF in either quadrant. Turn adjusting screw (24) in until a reading is obtained on thegage then turn it out by 1/4 turns until the gage reads zero. At zero pressure give the adjusting screw another 1/4turn out to open the exhaust valve.c.Move the handle to full increasing pressure position. The gage should read the pressure stamped on thenameplate. Related handle positions in both quadrants will have identical pressure readings.4-3.1.10Preload Setting. (Refer to figure 4-2) a. This setting calls for a predetermined downstream pressure when thehandle is moved 10° from OFF position in either handle quadrant.b.Place the handle 10° from OFF in either quadrant. Turn adjusting screw 24 in until the gage reads the desiredpreload pressure. Move the handle to the maximum pressure position. The gage should read the pressure onthe nameplate plus the preload setting.4-3.2PilotairValve. (Figure 4-4) 4-3.2.1 Disassembly.a.Remove capscrews (1) and lockwashers (2) to separate the housing assembly from the valve assembly.Remove followers (3).b.To disassemble the valve assembly, remove screws (4), washers (5) and flanges (6). Remove guides (7), o-rings (8), plungers (9) and o-rings (10).c.Remove springs (11), seats (12) and o-rings (13), then lift valves (14) from the body (19).d.Disassemble the valves by removing rings (15), springs (16) and valves (17) from spacers (18).NOTEUnder normal conditions the cam housing assembly should not require disassembly. If,however, disassembly is necessary, it is important that the position of the cams (31) on theshaft (28) in relation to the position of the handle (24) be noted.The cams are marked for position on the shaft and for the valve cavity that they are to operate.The position index mark indicates the position of the cam on the shaft when the handle is inthe upright position. This mark appears on the edge of the cam.The engraved cavity number indicates the valve cavity that the cam is to operate. Thismarking appears as an Arabic numeral on the same side of the cam as the position indexmark.4-25
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
