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Hydraulic Oil AeroShell Fluid 34

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Specifications

AeroShell Fluid 4 is a mineral hydraulic oil with very good low temperature
characteristics

The AeroShell Book
Edition 18 2003
189
Hydraulic Fluids
AEROSHELL FLUID 4
AeroShell Fluid 4 is a mineral hydraulic oil with very good low temperature
characteristics and capable of operating over a wide temperature range.
AeroShell Fluid 4 is composed of a mineral oil base stock and a complex
additive package which results in a product with excellent low temperature
flow and anti-wear properties, exceptional antifoam characteristics, and
excellent oxidation stability.
AeroShell Fluid 4 is dyed red.
APPLICATIONS
AeroShell Fluid 4 is intended for use as a hydraulic fluid in undercarriage
retraction mechanisms, flap jacks and control mechanisms, brakes, shock
absorbers, automatic pilots, oleo legs, tail wheels, servo units, etc.
AeroShell Fluid 4 is also suitable for lubricating de-icing pumps and
gearboxes.
AeroShell Fluid 4 should be used in systems with synthetic rubber
components and must not be used in systems incorporating natural rubber.
The latter systems require castor base fluids with which AeroShell Fluid 4 is
not interchangeable. Refer to the General Notes at the front of this section
for more information on compatibility.
AeroShell Fluid 4 is compatible with AeroShell Fluids 31, 41, 51, 61 and
71, although it is not recommended that AeroShell Fluid 4 is used in
systems which require the use of a superclean fluid nor should it be mixed
with superclean fluids for operational reasons.
Chlorinated solvents should not be used for cleaning hydraulic components
which use AeroShell Fluid 4. The residual solvent contaminates the
hydraulic fluid and may lead to corrosion.
SPECIFICATIONS
U.S. Meets MIL-H-5606A
(Obsolete see AeroShell Fluid 41)
British Meets DTD.585
(Obsolete see AeroShell Fluid 41)
Approved DEF STAN 91-48 Grade
Normal (European production only)
French Approved DCSEA 415/A
Russian Analogue to AMG-10
NATO Code H-520 (European production only)
Joint Service Designation OM-18 (European production only)
 
188
Hydraulic Fluids
PROPERTIES DEF STAN 91-48 TYPICAL
Grade Normal (European
Production)
Oil type Mineral Mineral
Kinematic viscosity mm2/s
@ 100°C 4.0 min 5.30
@ 40°C 13 min 14.1
@ 40°C 500 max 491
@ 54°C 3000 max 2300
Flashpoint
Pensky Martin Closed Cup °C 81 min 105
Pourpoint °C 60 max < 60
Total acid number mgKOH/g 0.2 max 0.01
Relative Density @ 15.6/15.6°C 0.87
Evaporation @ 100°C %m 20 max 10
Colour Red Red
Copper corrosion 2 max Passes
Low temperature stability Must pass Passes
Shear stability Must pass Passes
Foaming characteristics Must pass Passes
Phosphorus content % m/m 0.035 to 0.050 Passes
Oxidation & corrosion stability
168 hrs @ 135°C
metal weight change Must pass Passes
change in viscosity @ 40°C % 5 to +20 +2.0
change in acid number mgKOH/g 0.2 max +0.1
Anti-wear properties,
scar diam mm 1.5 max 0.95
Rubber swell 168 hrs @ 70°C
vol change % 19 to 30 25
A viscosity/temperature curve is shown at the end of this section.

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