b.
Tighten setscrew (6), then install pressure plate (5), holding plate (3) and air tube (4), and screws (2). Torque
screws to 4,400 in.-lbs.
c.
Install the air hose (1) in the drum shaft.
4-9.5.3 Replacing Friction Discs. Friction discs should be replaced when the maximum clearance, 1/2 inch, has been
reached (see step e.).
NOTE
The replacement of the friction discs does not require that the clutch assembly be removed
from shaft.
a.
Remove screws (20, figure 4-26) and withdraw driving ring (21) over the air tube holding plate (3, figure 4-27).
b.
Remove the split friction discs (7) from the clutch assembly.
c.
Place new friction discs (7), in halves, in clutch assembly.
NOTE
If new friction discs have been supplied as a continuous circle, they should be diametrically
cut with a hacksaw. Before sawing, mark each side of saw cut so that relative mating faces
are correctly positioned in clutch.
d.
Replace driving ring (21, figure 4-26) and install screws (20).
e.
Check clearance by applying and releasing air pressure to clutch, and measuring the total axial movement of
pressure plate (5, figure 4-27). Clearance should be 3/32 to 1/8 inch.
4-9.5.4 Replacing Air Tube.
a.
Refer to paragraph 4-9.4.1 and perform steps a. through i.
b.
Disconnect air hose (1, figure 4-27) from drum shaft. Hold release valve (8) securely and remove air hose (1)
from valve.
c.
Unscrew valve (8) from air tube fitting.
d.
Remove screws (2), holding plate (3) and air tube (4).
e.
Install a new air tube (4) in holding plate (3). Install plate and screws (2). Torque screws to 4,400 in.-lbs.
f.
Install release valve (8) and air hose (1). Install air hose in drum shaft.
g.
Refer to paragraph 4-9.4.2 and perform steps e. and g. through I., as applicable.
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