BRADEN PD12C Series Installation Maintenance And Service Manual page 23

CAUTION
!
Failure to replace brake springs as a set may result
in uneven brake application pressure and repeated
brake spring failure.
3. Place friction brake disc on fl at surface and check
for distortion with a straight edge. Friction mate-
rial should appear even across entire surface with
groove pattern visible. Replace friction disc if splines
are worn to a point, disc is distorted, friction material
is worn unevenly, or groove pattern is worn away.
4. Place steel brake disc on fl at surface and check for
distortion with a straight edge. Check surface for
signs of material transfer or heat. Replace steel disc
if splines are worn to a point, disc is distorted or heat
discolored.
5. Check brake spring free length; minimum free length
is 1 3/16 in. (30.2 mm). Check springs for any sign
of cracking or failure. If a brake spring must be re-
placed for any reason, then ALL brake springs must
be replaced.
ASSEMBLY
!
1. Begin assembly by placing motor support on work-
bench with motor mounting surface down. Install
new O-ring and back-up ring as shown.
2. Install a brake spacer into the motor support. (NOT
REQUIRED WITH LOBED DISCS.)
3. Insert fi rst, a steel brake disc against the spacer
followed by a friction brake disc then alternate steel
and friction discs until seven (7) friction and eight
(8) steel discs have been installed. Finish with a
steel brake disc on top.
NOTE: It is a good practice to pre-lubricate the discs
in hydraulic oil prior to assembly.
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