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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
µm and a maximum of 80 particles per milliliter greater than 15 µm.
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.
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