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Hydraulic Fluid Recommendations
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:
1. The filter system used in the hydraulic circuit should be capable of cleaning and
maintaining the hydraulic fluid to meet ISO Cleanliness Code 18/13 per SAE
J1165. This code allows a maximum of 2500 particles per milliliter greater than 5
µ
m and a maximum of 80 particles per milliliter greater than 15
µ
m.
2. At normal operating temperatures optimum viscosity ranges from 80-180 SUS
(16-39 cSt). Viscosity should never fall below 60 SUS (10 cSt) and, at the lowest
expected start-up temperature, should not exceed 10,000 SUS (2158 cSt).
3. The fluid should be chemically stable, incorporating rust and oxidation inhibitors.
Specific types of fluid that meet these requirements are:
•
Premium quality, industrial anti-wear type hydraulic fluid
•
Engine crankcase oil — SAE 10w, SAE 20w-20, SAE 30
•
Automatic transmission oil
•
Hydraulic transmission oil
•
Synthetic fire resistant fluid — Quintolubric, Cosmolubric, or equivalent
Note: If the natural color of the fluid has become black or milky it is possible that an
overheating or water contamination problem exists.
Take level readings when fluid is cold.
Summary of Contents for 1 Series
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