Hydraulic Fluid and Temperature Recommendations for Industrial Machinery Part 1

Unit Type	Viscosity	Anti-wear Characteristicts
Inline Piston (Pumps & Motors)	lViscosity Grades: 32-68 cSt (150-315 SUS) @ 40degC. (104_F) Running: 13-54 cSt (70-250 SUS) At Start Up: 220 cSt (1000 SUS) Max.	Antiwear type hydraulic oils such as: automotive crankcase oils having API letter designations “SE”, “SF”, “SG”, or “SH” per SAE J183
Angle Piston Vane (Except MHT) Gear (Pumps & Motors)	l Viscosity Grades: 32-68 cSt (150-315 SUS) @ 40degC. (104degF) Running: 13-54 cSt (70-250 SUS) At Start Up: 860 cSt (4000 SUS) Max.
u MHT (High Torque/ Low Speed Vane Motors	l Viscosity Grades: 32-68 cSt (150-315 SUS) @ 40degC. (104degF) Running: 13-54 cSt (70-250 SUS) At Start Up: 110 cSt (500 SUS) Max.

cSt: Centistokes
SUS:Saybolt Universal Seconds
u Adhere to the oil recommendations for MHT units rather than the pumps involved.
l Viscosity Grades are the standard viscosity grades listed in ASTM D-2422 titled “Viscosity System for Industrial Fluid Lubricants”, but any intermediate viscosity is acceptable.

Selection Of Viscosity Grades
Use the following tabulation to determine the temperature extremes between which the viscosity grades can be used to remain within Vickers start–up and running viscosity range recommendations.

The SAE 10W grades fall between the 32 cSt (150 SUS) and 46 cSt (215 SUS) grades and the SAE 20–20W approximates the 68 cSt (315 SUS) grade.

Viscosity Grade 40oC (104oF)	Start Up 860 cSt (4000 SUS)	Start Up 220 cSt (1000 SUS)	Start Up 110 cSt (500 SUS)	Running 54 cSt (250 SUS) Max.	Running 13 cSt (70 SUS) Min.
32 cSt (150 SUS) 46 cSt (215 SUS) 68 cSt (315 SUS)	–12oC (11oF) –6oC (22oF) 0oC (32oF)	6oC (42oF) 12oC (54oF) 19oC (66oF)	14oC (58oF) 22oC (72oF) 29oC (84oF)	27oC (80oF) 34oC (94oF) 42oC (108oF)	62oC (143oF) 71oC (159oF) 81oC (177oF)