8
The directional control valve must be a three-position,
four-way valve without detents and with a spring centered
motor spool such that the valve returns to the centered
position whenever the handle is released, and both work
ports are open to tank (open center, open port).
7. High-quality hydraulic oil is essential for satisfactory per-
formance and long hydraulic system component life.
HOIST BRAKE
BRAKE
VALVE
PUMP
CONTROL
VALVE
HOIST ASSEMBLY
W/BRAKE VALVE
& STATIC BRAKE
BR
DR
DO NOT
use a control valve with any detents or latch-
ing mechanism that would hold the control valve in an
actuated or running position when the operator releases
the control handle. Use of the wrong type of control valve
could lead to unintentional operation of the hoist, which
could result in property damage, personal injury, or death.
WINCH BRAKE
BRAKE
VALVE
2-SPEED
SELECTOR
VALVE
PUMP
CONTROL
VALVE
WINCH ASSEMBLY
W/BRAKE VALVE
& STATIC BRAKE
T
P
BR
DR
A
Oil having 150 to 330 SUS (30-60 cSt) viscosity at 104°F
(40°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 viscosity
with corresponding changes in temperature.
Maximum cold-weather start-up viscosity should not ex-
ceed 5,000 SUS (1,000 cSt) with a pour point at least 20°F
(11°C) lower than the minimum temperature.
Under continuous operating conditions the tempera-
ture of the oil at any point in the system must not ex-
ceed 180°F (82°C). Optimum oil temperature is gener-
ally considered to be 120°F to 140°F (49°C to 60°C).
In general terms; for continuous operation at ambient
temperatures between 50°F and 110°F (10°C and 43°C)
use ISO 46; for continuous operation between 10°F and
90°F (–12°C and 32°C) use ISO 32; for applications colder
than 10°F (–12°C), contact the BRADEN Service Depart-
ment. The use of multiviscosity oils is generally not rec-
ommended.
8. The hydraulic oil filter should have a 10-micron nominal
rating and be full flow type and meet the requirements of
the hydraulic pump manufacturer.
