M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
l A standard 4-40 x 2 screw can be threaded into the end of the shuttle valves to
aid in disassembly.
l All three valve body shuttle valves are disassembled the same way.
Remove plug (62), preformed packing (63), and shuttle valve (64).
Preformed packings and backup ring may stay in valve body.
Remove two preformed packings (65) and backup ring (66).
Both shuttle block valves are removed the same way.
Remove two screws (67), shuttle block (68), and three preformed packings (69) from valve
Remove plug (70), preformed packing (71), shuttle valve (72), two preformed packings (73), and
backup ring (74).