Manitowoc Grove 5540F Service Manual page 388

STRUCTURALS
pattern visible. Replace the friction disc if the splines are
worn to a point, disc is distorted, friction material is worn
unevenly, or the groove pattern is worn away.
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4. Place the steel brake disc on a flat surface and check for
distortion with a straight edge.Check surface for signs of
material transfer or hear. Replace the steel disc if the
splines are worn to a point, disc is distorted, or if it is heat
discolored.
5. Check the brake spring free length (Figure 11-100).
Minimum free length is 1-3/16 inch (30.2 mm). Check
springs for any sign of cracking or failure. If a brake
spring must be replaced, then all brake springs must be
replaced.
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NOTE: Failure to replace brake springs as a set may result
in uneven brake application pressure and repeated
brake spring failure.
11-44
Assembly
1. Begin assembly by placing the motor support on the
workbench with motor mounting surface down. Install
new o-ring and brake-spring (Figure 11-101).
FIGURE 11-99
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2. Insert first, a steel brake disc followed by a friction disc.
Then, alternate steel friction discs until seven (7) friction
and eight (8) steel discs have been installed
(Figure 11-102). Finish with a steel brake disc on top.
NOTE:
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3. Install the brake spacer on top of the last steel brake disc
(Figure 11-103).
FIGURE 11-100
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5540F/YB5515 SERVICE MANUAL
It is good practice to pre-lubricate the discs in a
light motor oil prior to assembly.
FIGURE 11-101
FIGURE 11-102
FIGURE 11-103