130°F with any of these light weight or diluted oils.
2. Antiwear Type Hydraulic Oil - There is no common
designation for oils of this type. However, they are
produced by all major oil suppliers and provide the
OTHER FACTORS IN SELECTING AN OIL ARE:
1. Viscosity - Viscosity is the measure of fluidity. In
addition to dynamic lubricating properties, oil must have
3. Certain Other Types Of Petroleum Oils are suitable
sufficient body to provide adequate sealing effect between
for Mobile hydraulic service if they meet the following
working parts of pumps, valves, cylinders and motors, but
not enough to cause pump cavitation or sluggish valve
(a) Contain the type and content of antiwear
action. Optimum operating viscosity of the oil should be
impounding found in MS crankcase oils or have passed
between 80 SSU and 180 SSU. During sustained high
pump tests similar to those used in developing the antiwear
temperature operation viscosity should not fall below 60
type hydraulic oils.
(b) Meet the viscosity recommendations shown in
the following table.
2. Viscosity Index - Viscosity index reflects the way
(c) Have sufficient chemical stability for Mobile
viscosity changes with temperature. The smaller the
hydraulic system service.
viscosity change the higher the viscosityindex.
viscosity index of hydraulic system oil should not be less
The following types of oil are suitable if they meet the
than 90. Multiple viscosity oils, such as SAE 10W-30,
above three provisions:
incorporate additives to improve viscosity index (polymer
Oils of this type generally exhibit both
Series 3 Diesel Engine Oil
temporary and permanent decrease in viscosity due to the
Automatic Transmission Fluid Types A, F and DEXRON
oil shear encountered in the operating hydraulic system.
Hydraulic Transmission Fluid Types C-1 and C-2
Accordingly, when such oils are selected, it is desirable to
use those with high shear stability to insure that viscosity
remains within recommended limits.
recommended for use with Vickers equipment in Mobile
hydraulic systems by viscosity and service classification.
3. Additives - Research has developed a number of
additive agents which materially improve various
characteristics of oil for hydraulic systems.
additives are selected to reduce wear, increase chemical
stability, inhibit corrosion and depress the pour point. The
(Min. * to Max.)
most desirable oils for hydraulic service contain higher
0°F to 180°F
amounts of antiwear compounding.
0°F to 210°F
50°F to 2100F
* Ambient Start Up Temperature
Where special considerations indicate a need to depart
** See paragraph on Viscosity Index
from the recommended oils or operating conditions, see
your Vickers sales representative.
The temperatures shown in table are cold start-up to
Thorough precautions should always be observed to
maximum operating. Suitable start-up procedures must be
insure that the hydraulic system is clean:
followed to insure adequate lubrication during system
1. Clean (flush) entire system to remove paint, metal
chips, welding shot, etc.
2. Filter each change of oil to prevent introduction of
contaminant into the system.
Arctic conditions represent a specialized field where
extensive use is made of heating equipment before
3. Provide continuous oil filtration to remove sludge
starting. If necessary, this, and judicious use of SAE 5W or
and products of wear and corrosion generated during the
SAE 5W-20 oil in line with the viscosity guide lines shown
life of the system.
in the table, may be used. Dilution of SAE 10W (SM) oil
4. Provide continuous protection of system from entry
with maximum of 20% by volume of kerosene or low
temperature diesel fuel is permissible. During cold start-
up, avoid high speed operation of hydraulic system
5. During usage, proper oil filling and servicing of
components until the system is warmed up to provide
filters, breathers, reservoirs, etc., cannot be over-
adequate lubrication. Operating temperature should be
closely monitored to avoid exceeding a temperature of