
54
Viscosity and Cleanliness Guidelines
ISO
Optimum
Cleanliness
Product Line
Minimum
Range
Maximum
Requirements
Comments
Heavy Duty Piston
10cSt
16 - 39 cSt
2158 cSt
18/13
Pumps and Motors
[60 SUS]
[80 - 180 SUS]
[10,000 SUS]
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 prob-
lems.
• If the natural color of the fluid has become black it is
possible that an overheating problem exists.
Product Line
Rating With Biodegradable Oil
Comments
Heavy Duty Piston
80% of normal pressure rating listed for mineral
82
°
C (180
°
F) max fluid temp (unit)
Pumps and Motors
oils.
71
°
C (160
°
F) max fluid temp (reservoir)
Biodegradable Oil (Vegetable) Guidelines
Additional Notes:
• Viscosity and ISO cleanliness requirements must be
maintained as outlined on page 14.
• 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.
• 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 of Eaton hydrostatic
components.
Hydraulic Fluid Recommendations
(Cont.)