Appendix
Operation Manual - All
S
P Rock Valve Model
s
126
revD
a
te
Appendix
The Appendix contains the technical documentation of
your machine and its systems. This documentation is
correct for your machine when it left the factory, but it
may need to be updated from time to time.
Hydraulic Oil Vi
s
co
s
ity Chart
NOTE!
Yo
u
r Schwin
g
u
nit w
a
s
d
eli
v
ere
d
with Mobil
Uni
v
is N46 hy
d
r
au
lic oil. This m
u
lti
v
iscosity oil sho
u
l
d
work nicely for
a
ny
tem
p
er
a
t
u
re between -20˚
F
a
n
d
100˚
F
. If
yo
u
h
av
e chosen to ch
a
n
g
e to
a
re
gu
l
a
r
v
iscosity oil,
pa
y close
a
ttention to the
followin
g
.
The chart below shows the relationship between the oil
temperature and its viscosity. As you can see, the oil
gets thicker when the temperature is low, and thinner as
the temperature rises.
•
The cold start limit represents the coldest
temperature at which the oil is thin enough to
flow into the hydraulic pumps. Anything
colder, and the pumps would not be able to
suck the oil (cavitation).
•
The minimum permissible viscosity represents
the warmest temperature at which the oil will
still be thick enough to provide lubrication and
sealing. Anything warmer, and the components
will have metal to metal contact (thermal
breakdown).
•
The optimum operating viscosity is the range
of oil thickness where the oil will work the
best (thin enough to flow easily, thick enough
to protect the system components).
For an example of how to read the chart, look at the
range for VG-46 oil below. The chart shows the cold
start limit as -8° C (18° F), and the minimum
permissible viscosity as 90° C (194° F). The optimum
range is at about 50° C to 76° C.
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