4-44. RELAY VALVE REPLACEMENT.
This Task Covers:
l Dolly set parked on level surface with handbrakes
Detergent (Item 4, Appendix E)
applied (para 2-2)
Antiseizing tape (Item 17, Appendix E)
Personnel Required: Two
l General mechanics tool kit
Following steps refer to removal of relay valve for M689 and M840 dolly sets. Removal
steps for M832 are similar.
Open draincock on air reservoir and drain air. Close draincock.
Disconnect service air hose (4) from relay valve (3).
Disconnect emergency air hose (5) from relay valve (3).
Disconnect air hose (6) from relay valve (3).