TM 9-2330-275-14&P
4-44. RELAY VALVE REPLACEMENT (Con’t).
5.
Disconnect air hose (7) from relay valve (3).
6.
Remove relay valve (3) and nipple (2) from air reservoir (1).
b.
INSTALLATION
1.
Apply antisizing tape to threads of nipple (2) and air hoses (4,5,6, and 7).
2.
Install nipple (2) and relay valve (3) on air reservoir(1).
3.
Connect air hose (7) to relay valve (3).
4.
Connect air hose (6) to relay valve (3).
5.
Connect emergency air hose (5) to relay valve (3).
6.
Connect service air hose (4) to relay valve (3).
c.
TESTING
1.
Couple dolly set to towing vehicle (para 2-14).
2.
Apply brakes of towing vehicle and cheek that brakes of dolly set apply.
3.
Release brakes of towing vehicle and check that brakes for dolly set release.
4.
Close valve on emergency air line of towing vehicle (refer to towing vehicle maintenance manual), and
disconnect emergency air coupling of dolly set. Cheek that brakes of dolly set apply.
5.
Connect emergency air coupling and open valve on emergency air line of towing vehicle. Check that brakes
of dolly set release.
6.
Test for air leaks at body of relay valve and at hose connections using detergent and water solution. No
leakage is permissible. Tighten air hose fittings or replace air hoses as necassary.
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