109
Appendix
SPB Operation Manual
Hydraulic Oil Viscosity Chart
The illustration 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.
Your Schwing concrete pump was delivered with Mobil
Univis N46 hydraulic oil. This multi viscosity works for
any temperature between -20˚ F and 100˚ F. If you have
chosen to change to a regular viscosity oil, pay close
attention to the following.
• The cold start limit represents the coldest tem-
perature at which the oil is thin enough to flow
into the hydraulic pumps. If it were any colder, the
pumps would not be able to suck in 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. If it were warmer, the components would
have metal-to-metal contact (thermal break-
down).
• The optimum operating viscosity is the range
of oil thickness at which the oil works best (thin
enough to flow easily, yet thick enough to protect
the system components).
• An example of how to read a chart for VG-46 oil
is given in the chart below. The chart shows the
cold start limit as –8°C (18°F) and the minimum
permissible viscosity as 90°C (194°F). The opti-
mum range is 50°– 76°C.
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90 100 110 120
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90 100 110 120
Temperature of Hydraulic Oil
-40 -22
-4
14
32
50
68
86 104 122 140 158 176 194 212 230 248
(C)
(C)
(F)
C = degrees Celsius
F = degrees Fahrenheit
Water freezes
Water boils
Cold Start Limit
(very thick oil)
Minimum permissible
viscosity
Optimum
Operating
Viscosity
VG
22
VG
32
VG
46
VG
68
VG
10
0
temp chart.eps
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