31EATON Series 1 Heavy Duty Hydrostatic Fixed Displacement Motors Parts and Repair E-MOPI-TS002-E September 2004
Additional Notes:
• Fluids too thick to flow in cold weather
start-ups will cause pump cavitation and
possible damage. Motor cavitation is not
a problem during cold start-ups. Thick oil
can cause high case pressures which in
turn cause shaft seal problems.
• If the color of the fluid has become
black, it is possible an overheating
problem exists.
• If the fluid becomes milky, water
contamination may be a problem.
•Take fluid level reading when the system
is cold.
• Contact your Eaton representative if you
have specific questions about the fluid
requirements.
Hydraulic Fluid
Recommendations
Viscosity/Cleanliness
Guidelines
Additional Notes:
•Viscosity and ISO cleanliness requirements
must be maintained as outlined.
• Based on limited product testing to date,
no reduction in unit life is expected when
operating at the pressure ratings indicated
above.
•Vegetable oil is miscible with mineral oil.
However, only the vegetable oil content is
biodegradable. Systems being converted
from mineral oil to vegetable oil should be
repeatedly flushed with vegetable oil to
ensure 100% biodegradability.
• Specific vegetable oil products may provide
normal unit life when operating at pressure
ratings higher than those indicated above.
RATING WITH BIODEGRADABLE OIL COMMENTS
80% of normal pressure rating 82° C (180° F) max fluid temp (unit)
listed for mineral oils. 71° C (160° F) max fluid temp (reservoir)
Biodegradable Oil
(Vegetable) Guidelines
ISO
OPTIMUM CLEANLINESS
MINIMUM RANGE MAXIMUM REQUIREMENTS
10cSt 16 - 39 cSt 2158 cSt 18/13
[60 SUS] [80 - 180 SUS] [10,000 SUS]
A reputable supplier can help you make the
best selection of hydraulic fluid for use in
Eaton hydrostatic products.For satisfactory
operation, the following recommendations
apply:
• The filter system used in the hydraulic cir-
cuit must be capable of maintaining the
fluid at ISO Cleanliness Code 18/13 per
SAE J1165. This code allows a maximum
of 2500 particles per milliliter greater than
5µm and a maximum of 80 particles per
milliliter greater than 15µm.
• At normal operating temperatures,
optimum viscosity ranges are from 80–180
SUS [16–39 cSt]. Viscosity should never
fall below 60 SUS [10cSt] and, at the
lowest expected startup temperature,
should not exceed 10,000 SUS [2158 cSt].
• The fluid should contain anti-wear agents,
rust inhibitors, and anti-foaming agents.
Note: If the fluid becomes black or milky, an
overheating or water contamination
problem exists. Take fluid level
readings when the fluid is cold.
Note:
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