RELAY VALVE MAINTENANCE (MODEL WPES-1) - continued.
a. Install three tube elbows (11, 5, and 4) on relay valve (17).
Using wrench on tube fittings threads will cause damage to threads. Use wrench only on wrenching
b. Install adapter (15) with bolts (16) onto airbrake relay valve (17).
c. Position relay valve (17) on frame and install three locknuts (13).
d. Connect three tubes (12, 6, and 3) to airbrake relay valve (17).
e. Connect four hoses (10, 9, 8 and 7) to airbrake relay valve (17) as tagged.
f. Check that drain cock (1) is turned fully closed.
g. Operate airbrake system and check for leaks (TM 10-4610-240-10).