BRADEN HP35A - Brake Cylinder Service; Brake Cylinder Disassembly; Brake Cylinder Cleaning and Inspection; Brake Spring Replacement Warning

34
BRAKE CYLINDER SERVICE
1
2
3
4
5
9
8
6
7
11
11
12
12
10
10
13
13
14
14
DISASSEMBLY
1. Set the brake assembly on a work bench with the mo-
tor adapter up. Remove the capscrews (item 14) and
lockwashers (item 13). Use a crisscross pattern and
loosen each capscrew one turn at a time until spring
tension is released.
2. Remove the motor adapter (item 10). Lift out all the
brake discs (item 8), friction discs (item 9) and the
spacer (item 5).
3. Remove and discard the O-Ring and backup ring (items
11 & 12 from the motor adapter. Remove and discard
the brake piston seal (item 7) from the brake cylinder.
Remove the steel piston backup ring (item 6).
4. Remove the pressure plate (item 4) and the springs
and spring spacer (items 2 & 3) from the brake cylin-
der.
Clean and Inspect
1. Thoroughly clean and inspect all parts at this time.
Check sealing surfaces on both the motor adapter and
brake cylinder. Be sure the brake release port is open
and free of contamination.
2. Place each friction brake disc on fl at surface and check
for distortion with a straight edge. Friction material
should appear even across entire surface with groove
pattern visible. Replace any friction disc if splines are
worn to a point, disc is distorted, friction material is
burned or worn unevenly, or groove depth is less than
0.003 in. (0.08 mm).
3. Place steel disc on fl at surface and check for distortion
with a straight edge. Check surface for signs of mate-
rial transfer or excessive heat. Replace any steel disc if
distorted, heat discolored, or mechanically damaged.
4. Check brake spring free length. Check springs for any
signs of cracking or failure. If a brake spring must be
replaced for any reason, then ALL brake springs must
be replaced.
Minimum Free Length
HP35A 1-3/16 inch (30.2 mm)
The motor adapter is under spring tension from the
brake springs. Loosen each of the capscrews one turn
at a time until spring tension is released.
CAUTION
Brake springs must be replaced as a set. Failure to re-
place brake springs as a set may result in uneven brake
application pressure and repeated brake spring failure,
resulting in personal injury or death.
ITEM DESCRIPTION QTY
1 BRAKE END SUPPORT 1
2 SPRING SPACER 1
3 DIE SPRING 12
4 PRESSURE PLATE STAMPING 1
5 SPACER 1
6 PISTON BACKUP RING 1
7 SEAL 1
8 BRAKE DISK 8
9 850170 DISC-FRICTION 7
10 MOTOR SUPPORT 1
11 O-RING 1
12 BACK-UP RING 1
13 LOCKWASHER 4
14 CAPSCREW 4