b.
Place the handle 10° from OFF in either quadrant. Turn adjusting screw (24) in until a reading is obtained on the
gage then turn it out by 1/4 turns until the gage reads zero. At zero pressure give the adjusting screw another 1/4
turn out to open the exhaust valve.
c.
Move the handle to full increasing pressure position. The gage should read the pressure stamped on the
nameplate. Related handle positions in both quadrants will have identical pressure readings.
4-3.1.10
Preload Setting. (Refer to figure 4-2) a. This setting calls for a predetermined downstream pressure when the
handle 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 desired
preload pressure. Move the handle to the maximum pressure position. The gage should read the pressure on
the nameplate plus the preload setting.
4-3.2
Pilotair Valve. (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).
NOTE
Under 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 the
shaft (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 in
the 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. This
marking appears as an Arabic numeral on the same side of the cam as the position index
mark.
4-25
