coolers, shall be furnished if
D.
Flow control valves.
required to meet the maximum oil
Flow control valves shall be of a
temperature requirement.
The
type (such as open-center valves)
government reserves the right to
that assures that hydraulic fluid is
request and be furnished test
never deadheaded and forced to
documents
showing
maximum
flow over the relief valve. Flow
stabilized temperatures of hydraulic
control valves shall be expandable
systems.
to control multiple devices, either in
G.
Hydraulic reservoirs.
parallel or in series.
Series
designed systems shall not exceed
A stainless steel, aluminum (6061-
the maximum working pressure of
T6 or 5086-H32 construction only),
any component in the series. Flow
or other non corroding type
control valve body shall not be
hydraulic
reservoir
shall
be
mounted inside the cab.
Flow
furnished and sized such that the
control valves shall be operated
reservoir working volume is a
through leavers mounted inside the
minimum of 150% of the maximum
cab within easy reach of the seated
hydraulic flow rate. The reservoir
driver. Control leavers shall operate
shall be furnished with the following:
flow control valves through flexible
1.
The reservoir shall be furnished
cables or air pressure and permit
with a baffle separating the
smooth, infinitely variable operation
suction from the return flow.
of equipment through the full
designed range of operational
2.
The reservoir shall be furnished
travel/speed limits of the equipment.
with minimum ¾ in. air filtration
type breather or combination
E.
Fluid filtration.
breather cap with not greater
A return line hydraulic filter shall be
than 10-micron air born particle
furnished
having
a
minimum
rating.
efficiency rating of 99% down to 10-
3.
The reservoir shall be furnished
micron size particles and meet or
with a sump and valve for
exceed the filtration requirements of
draining water from the bottom
the pump, motor, or driven device
of the tank and for draining oil.
manufacturer. The filter shall be
furnished with a pressure differential
4.
The reservoir shall be furnished
type service gage or service
with a metal enclosed and
indicator.
protected sight glass for
observing oil level.
F.
Hydraulic system cooling.
5.
The reservoir shall be furnished
Hydraulic systems shall be designed
with a maximum 300 mesh (50
to operate in ambient temperatures
micron) fill strainer.
ranging from 20 deg F to +120 deg
F.
6.
The reservoir shall incorporate
a return tube that discharges
The hydraulic system shall be
return oil below the surface of
designed such that the maximum
the reservoir oil.
hydraulic oil temperature does not
exceed 200 deg. F.
For
H.
Hydraulic oil.
continuously driven devices, such as
Hydraulic oils shall meet the
spreaders and other motor driven
minimum requirements of the
applications, auxiliary cooling, such
hydraulic pump or other critical
as air-to-oil coolers or water-to-oil
component manufacturer(s). Water
Page 11 of 79
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