Great Plains DVN8324 Operator Manual - Manual (Page 58)

54 8315-8324DVN Great Plains Manufacturing, Inc.
550-466M 11/25/2013
Brake Drum Maintenance
Refer to Figure 53
46. Inspect the shoe surface (the inside rim). Normal
appearance is dull gray, with no more than light scor-
ing and light wear.
One or two light score marks are not cause for resur-
facing or replacement. If there are any questions
concerning the condition of a drum, consult an
expert.
Replace or resurface a drum that is heavily scored,
worn to more than 0.51mm (0.020in) oversize, or has
0.38mm (0.015in) or greater run-out.
Brake Drum Resurfacing
47. A standard drum lathe is suitable for machining the
shoe surface.
When removing surface, do not exceed the maxi-
mum diameter cast in the brake drum.
Be sure to remove any metallic chips and contamination
resulting from drum machining.
Re-Mount Hub and Drum
Refer to Figure 54
48. Repack any bearings removed.
49. If replacing inner bearing seal , orient it with the
seam side out (away from bearing). Seat the seal so
that it is completely inside the narrow diameter of the
hub, and close to, but not touching the bearing
cup
.
Seals are hollow metal structures and are somewhat fragile.
The are not intended to be in contact with the bearings. When
installing them, carefully align them so they are concentric
with the shaft hole. Apply insertion force across the entire face,
or at least equally along the entire outside diameter (as close
to the seal O.D. as possible).
50. Carefully place drum/hub assembly on spindle.
51. Insert re-packed outer bearing .
52. Add spindle washer and castle nut .
53. Tighten nut until drum/hub does not turn freely.
Loosen nut 1 ⁄
6
turn, and as much looser as needed to
align hole in spindle (not shown) with notches in nut.
54. Secure nut with cotter pin . Install dust cap .
Heavily scored, worn or oversized drums can reduce brake
performance or cause loss of braking. This could result in
death, serious personal injury, or property damage.
Failure to remove chips can cause bearing failure, brake fail-
ure or wheel/spindle separation. This could result in death,
serious personal injury, or property damage.
Figure 53
Brake Drum
29635
Wear a respirator equipped with a HEPA filter approved by
NIOSH or MSHA when grinding or machining brake drums. In
addition, do such work in an area with a local exhaust ventila-
tion system equipped with a HEPA filter.
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Figure 54
Re-mount Hub and Drum
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