trinityhighway.com
29
Revision
A
November
2019
Hydraulic
Fluid
1.
Purpose
The
main
purpose
of
hydraulic
fluid
is
to
transfer
power
from
the
pump
to
the
actuators.
Secondary
tasks
include
reducing
metal
on
metal
friction
and
preventing
the
formation
of
rust
and
sludge.
These
traits
are
achieved
when
the
oil
has
a
good
lubricity
(slipperiness),
and
with
additives
that
inhibit
oxidation
and
the
entrainment
of
air
and
water
in
the
oil,
respectively.
The
viscosity
(thickness)
of
the
oil
must
be
appropriate
for
the
operating
temperature
to
minimize
unwanted
leakage
and
to
lubricate
the
close
fitting
parts
in
the
system.
Additionally,
the
oil
must
be
compatible
with
the
seals
used
in
the
system.
Finally,
the
oil
must
be
able
to
pour
or
fl
ow
at
the
lowest
expected
operating
temperature
so
that
it
can
enter
the
reservoir
and
pump
for
use.
For
all
of
these
reasons,
automatic
transmission
fl
uid
(ATF,
Dexron
TM
III)
has
been
found
to
be
the
best
readily
available
fl
uid
for
the
job
in
most
climate
conditions.
2.
Selecting
Fluids
for
Applications
Outside
ATF’S
Temperature
Range
When
looking
for
fluids
that
can
be
used
in
place
of
ATF
or
for
applications
where
the
operating
temperature
is
outside
the
range
of
ATF,
the
following
specs
should
be
discussed
with
your
local
oil
distributor:
A.
Fluid
must
be
compatible
with
Buna-N
sealing
compounds.
B.
The
pour
point
of
fluid
used
must
be
below
the
lowest
anticipated
temperature.
C.
Fluid
should
contain
Rust
or
Oxidation
inhibitors
as
well
as
other
detergent
type
inhibitors.
D.
Fluid
viscosity
(SUS)
must
have
an
operating
range
between
80
and
375,
with
the
ideal
viscosity
near
200
SUS.
E.
The
viscosity
index
should
be
as
high
as
possible.
As
an
example,
ATF
has
the
following
specs
listed
for
most
oil
manufacturers:
[1]
Viscosity
(SUS)
37
º
C
99
º
C
Pour
Point
185
to
205
45
to
55
-47
º
F
[-44º
C]
to
-35
º
F
[-37º
C]
Viscosity
Index
145
to
165
Содержание INGAL SS180 M
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