TM 5-3895-346-14
FLUID RECOMMENATIONS
HYDROSTATIC SYSTEM
FLUID RECOMMENDATIONS
HYDROSTATIC TRANSMISSIONS
Hydraulic fluids selected for use with the Sundstrand hydrostatic transmission should be a quality product
carefully selected with assistance from a creditable supplier.
Characteristics of the fluid selected should include:
Viscosity
Oxidation
Thermal Stability
Shear Stability
Low Temperature Fluidity
Antiwear
Anticorrosion
Antifoam
Seal Conditioning for Buna-N and Viton Elastomers
The following types of fluids have been used successfully in the hydro- static transmission: (1) antiwear
hydraulic oil, (2) automatic trans- mission fluid - Type-F, and (3) hydraulic transmission fluid (type used by the
Agricultural industry for combined transmission, hydraulic and wet brake systems). If a fire resistant fluid is
required, Pydraul 312 has been satisfactory.
Most of the above fluid types have acceptable viscosity characteristics in the operating range of 0 to 200 .
F
F
The fluids selected should provide a minimum viscosity of 47 SUS at 210 and a maximum measured
F
viscosity of 6000 SUS at the lowest expected startup temperature. Typical fluid properties are listed on the
attached table.
Typical
Viscosity
SUS
Viscosity
Pour
Operating Range
Fluid Type
0
F
100
F
210
F
Index
Point
F
(Typical )
F
Antiwear
Hydraulic
Oil
7000
200
50
130
-30
0-200
F
Type-F
3200
212
57.2
208
-40
-15-200
F
Hydraulic
Transmission
Oil
12,000
233
49
100 Min.
-35
0-200
F
*Pydraul 312
100,000
312
51
77
-10
50-200
F
*Fire Resistant Fluid
488
