BRADEN PD12C Series Installation Maintenance And Service Manual page 24

4. Install the remaining brake spacer on top of the last
steel brake disc. (This is the only spacer used with
lobed discs.)
5. To check brake stack height, place pressure plate on
top of brake spacer. Hold pressure plate down fi rmly
by hand and measure clearance in three places be-
tween motor support and pressure plate. Average
gap must measure between .153 in. (4 mm) maxi-
mum and .080 in. (2 mm) minimum. If the gap ex-
ceeds the maximum limit, there are too many brake
discs in stack-up or the discs are distorted. If the gap
is less than the minimum, there are too few discs
in stack-up or the discs are worn out. When stack
height is correct, remove pressure plate and con-
tinue assembly.
6. Lubricate the brake piston seal and motor support
sealing surface with petroleum jelly or hydraulic oil.
Install new piston seal to motor support, seal lip
down.
OLDER STYLE BRAKE CYLINDER
7. Install brake springs into brake cylinder
NEW STYLE BRAKE CYLINDER
7A.When using the new style brake cylinder without
milled spring pockets, install the spring spacer, then
the brake springs.
Always use the molded spring spacer with the new
brake cylinder. The brake springs must be properly
positioned by the spring spacer. Failure to install
the spring spacer may allow the springs to contact
each other and become damaged. This could result
in loss of load control, property damage, injury or
death.
8. Install pressure plate into brake cylinder followed
by the piston back-up ring. The close-fi tting piston
back-up ring may be depressed slightly to one side
to lodge the back-up ring in the brake cylinder bore
and temporarily hold the pressure plate and springs
in place while you lower the brake cylinder over the
motor support.
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