5
brake pack and locks the brake coupling to the motor
adapter, preventing the gear train or cable drum from rotat-
ing in either direction. The solid brake coupling makes the
static brake "effective both directions". This means the stat-
ic brake must be released before the winch can operate in
either the hoist or lower direction.
The static brake is released by pilot pressure applied to the
brake cylinder. It releases at a pressure lower than that
required to open the pilot operated counterbalance car-
tridge. This sequence assures that dynamic braking is
done by the counterbalance cartridge and that little, if any,
heat is absorbed by the friction brake.
The static or friction brake is primarily a load holding brake
and will provide dynamic braking only during extremely slow
operation when there is insufficient flow and pressure to
open the counterbalance cartridge.
OPERATION
Since the static brake on this winch is "effective both direc-
tions", the brake must be hydraulically released to operate
the winch in either the hoist or lower direction.
When the winch is powered in either direction, the motor
cannot rotate until sufficient pilot pressure is present to
open the counterbalance cartridge. The friction brake will
completely release at a pressure lower than required to
open the counterbalance cartridge. The extent to which the
cartridge opens will determine the amount of oil that can
flow through it and the speed at which the cable drum will
turn. Increasing the flow of oil to the winch motor will cause
the pressure to rise and the opening in the cartridge to
enlarge, speeding up the cable drum. Decreasing the flow
causes the pressure to drop and the opening in the car-
tridge to decrease, slowing down the cable drum.
When the control valve is returned to the neutral or center
position, pressure will rapidly drop and the counterbalance
cartridge will close, stopping the load. The friction brake will
engage and hold the load after the cartridge is closed.
WINCH AND WIRE ROPE
INSTALLATION
1. The winch should be mounted with the centerline of the
cable drum in a horizontal position. The mounting
plane of the winch may be rotated in any position
around this centerline providing the vent in the motor
adapter is above the centerline of the cable drum. The
vent should be as close to top dead center as possible.
2. When mounting the winch, use all four (4) mounting
holes and grade eight (8) bolts and nuts. Evenly tight-
en the nuts to the torque in the "Recommended
Torque" chart. Refer to "Dimensional Drawing" for bolt
hole size and pattern.
It is important that the winch is mounted on a sur
face that will not flex when the winch is in use, and
cause binding of the gear train. Binding in the gear
train will result in accelerated wear and heat. Also,
the mounting surface should be flat with ± 0.020
inches. If necessary, install shims under the winch
mounting pads to achieve even mounting.
3. The hydraulic lines and components that operate the
winch should be of sufficient size to assure minimum
back pressure at the winch. The back pressure at the
motor must not exceed 100 psi (690 kPa) to maintain
full brake system design factor and optimum motor seal
life.
The winch 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).
4. High quality hydraulic oil is essential for satisfactory
performance and long hydraulic system component
life.Oil having 150 to 330 SUS viscosity at 100
o
F (38
o
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 trouble and reduce the length of warm-up periods.
A high viscosity index will minimize changes in viscosi-
ty with corresponding changes in temperature.
Maximum cold weather start-up viscosity should
not exceed 5,000 SUS with a pour point at least
20
o
F (11
o
C) lower than the minimum ambient tem
perature.
Under continuous operating conditions the temper
ature of the oil at any point in the system must not
exceed 180ºF (82
o
C). 120
o
F (49
o
C) to 140
o
F
(60
o
C) is generally considered optimum.
In general terms:
For continuous operation at ambient temperatures
between 50
o
F (10
o
C) and 110
o
F (43
o
C), use SAE
20W; for continuous operation between 10
o
F (-
12
o
C) and 90
o
F (32
o
C), use 10W; for applications
colder than 10
o
F (-12
o
C), contact the BRADEN
Service Department. The use of multi-viscosity oils
is generally not recommended.
5. The hydraulic oil filter should have a 10 micron nominal
rating and be full flow type.
6. The vent plug in the motor adapter must be located
close to top dead center as possible. If the winch is
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