5
The PCD24B capstan drive should normally be mounted
with the centerline of the output shaft in a horizontal posi-
tion. The drive may be rotated to any position around
this centerline. There are four
3
/
8
NPT plugs in the drive
housing, 90 degrees apart. When the mounting posi-
tion of the drive is determined, the highest of these plugs
should be removed and replaced with the reducer
bushing and vent plug, which are shipped with the drive.
The drive is shipped with oil, so be sure the plug you
remove is above the horizontal centerline to avoid oil
loss.
The drive housing has six (6) through drilled holes for
5
/
8
in. capscrews and four (4) holes drilled and tapped
to ¾ - 10 that can be used for mounting. The drive can
be either flange mounted using the four holes in the face
of the housing, or surface mounted using the four tapped
holes. A minimum of four (4) grade 5 or better fasten-
ers should be used.
Both motor ports on all drives are SAE -10 ORB, and
are located in the brake valve block. The shift port on
two speed motors is SAE -4 ORB, also in the valve block.
Two speed motors normally operate in low speed, and
are shifted to high speed by applying a minimum of 100
PSI to the shift port. Shift pressure MUST be 100 PSI
greater then the return line back pressure, and can be
as high as system pressure. The shift port is shown as
port “X” in the hydraulic circuit drawing that follows.
The hydraulic lines and components that operate the
drive should be of sufficient size to assure minimum back
pressure at the motor. Back pressure at the motor must
not exceed 100 PSI (690 kPa) to maintain optimum motor
seal life and assure complete brake application.
The directional control valve must be a three position
four way valve with a motor spool such that when the
valve is in the center position both work ports are open
to tank (open center, open port).
To install the bayonet type capstan, push the capstan
onto the extension shaft, against spring tension, then
turn counter-clockwise (viewed from the outside) to the
stop. Release the capstan and verify that the spring has
pushed the capstan outward into the lock position. A
cutaway drawing of the capstan is shown in the “General
Safety Recommendations” earlier in this manual.
High quality hydraulic oil is essential for satisfactory per-
formance and long hydraulic system component life. Oil
having 150 to 330 SUS viscosity at 100° F (38° C) and
viscosity index of 100 or greater will give good results
under normal temperature conditions. The use of an oil
having a high viscosity index will minimize cold start trou-
ble and reduce the length of warm-up periods. A high
viscosity index will minimize changes in viscosity with
corresponding changes in temperature.
Maximum cold weather start-up viscosity should not
exceed 5,000 SUS with a pour point at least 20° F
(11° C) lower than the minimum ambient temperature.
Under continuous operating conditions the temperature
of the oil at any point in the system must not exceed
180° F (82° C).
120° F (49° C) to 140° F (60° C) is generally consid-
ered optimum.
In general terms:
For continuous operation at ambient temperatures
between 50° F (10° C) and 110° F (43° C), use
SAE 20W
For continuous operation between 10° F (-12° C)
and 90° F (32° C), use 10W
For applications colder than 10° F (-12° C), con-
tact the Braden Service Department.
The use of multi-viscosity oils is generally not rec-
ommended.
The hydraulic oil filter should have a 10 micron nomi-
nal rating and be full flow type.
DRIVE INSTALLATION
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