FIGURE 2-1. MODEL 321 HOSE TESTER COMPONENT RELATIONSHIP AND TEST CONNECTIONS (cont)

TM 55-4940-353-13&P

monitor the oil pressure gages (15 and 16). Slow

g. Open the oil control valve (13).

continuously falling pressure is evidence of a leak.

h. Detach the test hose (21) from the manifold

adaptor (19).

NOTE

When the air control valve (9) is initially

i. Drain oil in the test hose (21) by raising the

closed, the indicated pressure may drop as

manifold end above the oil return port.

much as 10 percent due to the expansion of

the hose.

j. Disconnect the test hose (21) from the oil return

adaptor (14).

f. After the desired test interval turn the pressure

regulator (3) fully counter clockwise.

2-4