TM 55-1925-286-13&P
0019 00
e. If the compressors do not stop running when the starting air pressure reaches 250 PSI (17.2 bar),
adjust the cutoff pressure. To adjust the cutoff pressure, turn the spring loaded adjusting screw
(figure 3, item 7) clockwise until the desired cutoff pressure is achieved. To decrease the cutoff
pressure, turn the spring loaded adjusting screw (figure 3, item 7) counterclockwise until the de-
sired cutoff pressure is achieved.
5. Perform the Follow-On Service procedure at the end of this work package.
REPLACE UNLOADER PILOT VALVE
REMOVAL
1. CLOSE, lock out, and tag out (FM 55-502) the applicable COV-COMPR DISCH valves CA-1 or CA-2
(figure 1, item 15) and CA-89 or CA-90 (figure 1, item 16).
2. Remove the compressed air tubing and fittings from the air inlet (figure 4, item 1), the air out to head unloader
(figure 4, item 2), the air in from hydraulic unloader (figure 4, item 3), and the compressed air tubing from the
air tank (figure 4, item 4).
3. Unscrew the unloader pilot valve (figure 4, item 5) from the compressor (figure 4, item 6).
7
3
8
6
5
1
2
4
Figure 4. Unloader Pilot Valve
0019 00-5
