TM 9-2320-279-34-3
M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
17-21.
HOIST DRIVE MOTOR CONTROL VALVE REMOVAL/REPAlR/INSTALLATION
(CONT).
NOTE
There are two models of control valves. Model A (Snap-Tite, no longer available as
an assembly) has an SAE #4 brake port. Model B (Dana) has an SAE #6 brake
port. Removal procedures are identical for both.
a.
Removal. Remove four screws (1), lockwashers (2), control valve (3), and two preformed
packings (4).
b. Disassembly.
NOTE
Perform steps (1) through (3) for Model A. Perform steps (3.1) through (3.5) for
Model B.
(1)
(2)
Remove two fittings (1) and preformed packings (2).
(3)
Remove elbow (3) and preformed packing (4).
Remove three plugs (5).
17-94 Change 3
