10
MHD56181 - Edition 1
Filters
Filters should be equipped with dirty filter indicators, which
should be checked daily. Replace filters if indicators show filter is
dirty. It is also recommended that filters be changed if hydraulic
oil is changed or a major component (pump, valve, motor, etc.) is
repaired or replaced.
When the winch is installed with its own hydraulic system or
when there is no filter in the existing circuit, a partial flow micro-
filter should be installed between the control valve and the
reservoir. This filter should be rated at Beta 200=6µm. Filters
must include an integral 50 psi (345 kPa/3.45 bar) bypass check
valve which will open when the filter element is filled to 80%
capacity.
Refer to ‘Filter Maintenance’ in the “MAINTENANCE” section
for servicing information.
Hydraulic Connections
When repairing or servicing any hydraulic lines or fittings in the
system, always flush each line and connection of all foreign
contaminants before making the final connection. Always cap or
plug open connections or lines. Verify port connections match
motor and installation information provided.
(Dwg. MHP1804)
Pump
Ensure the pump used with the winch motor is capable of
producing pressure and volume as specified for the winch.
Control Valve
The control valve used to operate the winch must be a four-way,
spring return to neutral, open center valve having a motor spool
directing all work port flow to the reservoir (return lines) when
the valve spool is in the neutral position. This control valve
should have good metering characteristics in order to provide
smooth winch control. A built-in relief valve, suitable for
maximum operating pressure and flow, should also be installed in
the control valve and/or hydraulic system.
Motor
For optimum performance and maximum durability of parts,
ensure hydraulic supply does not exceed recommended pressures
and flows. When feasible the motor should be installed as near as
possible to the pump. Motor case drain lines must be ported to the
reservoir and must not exceed 30 psi (207 kPa/2 bar).
(Dwg. MHP1759)
Disc Brake
Disc brake is shipped with petroleum based cooling oil installed.
Prior to operation, confirm oil level is to manufacturer’s
recommendations.
Initial Operating Checks
Winches are tested for proper operation prior to leaving the
factory. Before the winch is placed into service the following
initial operating checks should be performed.
1.
Make sure the hydraulic motor and case drain line is filled
with the recommended hydraulic fluid. Internal motor
leakage at low operating pressures may not be sufficient to
provide start-up lubrication.
2.
Verify oil levels are in accordance with recommendations in
“LUBRICATION” section. Ensure all installation steps have
been followed.
3.
When first operating the winch it is recommended that the
winch be driven slowly in both directions for a few minutes.
For winches that have been in storage for a period of more than
one month the following start-up procedure is required.
1.
Give the winch an inspection conforming to the requirements
of “Winches Not in Regular Use” in the “INSPECTION”
section.
2.
Operate the winch for 10 seconds in both directions to prime
all lines.
3.
The winch is now ready for normal use.
