36
ASSEMBLY
1. Place the motor adapter (40) on a clean work surface
with the motor mounting surface down. Apply a light
coat of oil to a new backup ring (item 27) and O-Ring
(item 28) and install them into the groove on the motor
adapter. Backup rings are always placed on the low
pressure side of the O-Ring. In this case, the backup
ring is toward the motor mounting surface. Lightly oil
the brake cylinder seal (item 30) and install it onto the
motor adapter with the seal lip down.
2. Lubricate the friction discs with the same oil used in the
hoist. Install a steel brake disc (item 26) into the motor
adapter, followed by a friction disc (item 25). Continue
to alternately install steel and friction discs until there
are 8 steel and 7 friction discs. A steel disc will be on
top.
3. Install the brake plate spacer (item 53) on top of the
last steel disc.
4. Place the brake housing (5) on a clean work surface
with the motor end facing up. Install the spring spacer
(item 62), then the 18 springs (item 55).
5. Install the pressure plate (item 52) into the brake hous-
ing. Be careful that none of the springs fall over. Install
the steel backup ring (item 59).
NOTE:
The close fi tting backup ring may be depressed
slightly to one side to lodge it in the brake cylinder bore
and temporarily hold the pressure plate and springs in
place while the brake cylinder is inverted and lowered
over the motor adapter. As an alternate, the motor adapt-
er and brake plates can be turned over and installed into
the brake cylinder, holding the brake plates and spacer in
place through the center opening. Be careful to not pinch
your fi ngers between the spacer plate and the pressure
plate.
6. Apply petroleum jelly or oil soluble grease to the seal-
ing surface of the brake housing and the piston seal.
Turn the brake cylinder over and lower it onto the motor
adapter, being careful not to damage the piston seal or
O-Ring on the adapter. The alternate assembly method
above can also be used.
7. Turn the entire assembly over and install the eight cap-
screws (32) and lockwashers (31). After the capscrews
make contact with the motor adapter, evenly tighten
them one turn at a time until the motor adapter is drawn
tight against the brake housing. Torque the capscrews
to the value given in the torque chart in this manual.
BRAKE CYLINDER PRESSURE TEST
1. Install a -4 ORB fi tting into the brake release port on
the motor adapter. Connect a hand pump with an ac-
curate 0-2,000 psi (0-13,800 kPa) gauge and shut-off
valve to this fi tting. Apply 1,000 psi (6,900 kPa) to the
brake and close the shut-off valve. Let the unit stand for
fi ve minutes. If there is any loss of pressure, the brake
cylinder should be disassembled for inspection of the
sealing surfaces, seal and O-Ring. When the source of
the pressure leak has been determined and corrected,
re-assemble the brake cylinder and repeat the test.
2. WHILE PRESSURE IS APPLIED AND THE BRAKE IS
RELEASED, install the over-running clutch assembly
into the brake pack. Turn the clutch back and forth to
align the splines on all the friction discs. Release the
pressure on the brake cylinder and remove the clutch
assembly. The brake cylinder is now complete and
ready to be installed in the hoist.
Seal
O-Ring
Backup Ring
Always use the molded spring spacer to properly posi-
tion the springs in the brake cylinder. 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.
Summary of Contents for BRADEN HP125B
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