MTS Series 647 Hydraulic Wedge Grips - Manual (Page 23)

Hydraulic Fluid Recommendations
All frame mounted 3000 psi and 10,000 psi grip supplies use standard Mobile DTE-25 hydraulic fluid from
the HPU. The grips that use this fluid are rated to 65 °C (150 °F) maximum. All other hydraulic grips that are
used within a chamber are rated to maximum of 177 °C (350 °F). These grips require the use of a stand alone
grip supply that uses Mobile SHS 525 hydraulic fluid. This fluid has a flash point and overall temperature
rating higher than 177 °C (350 °F). MTS does not recommend the use of hydraulic grips that have hydraulic
fluid inside chambers rated at higher temperatures.
Cooling Water Specifications
Specification Parameter
35°C (95°F) maximum Temperature
3.8 L/min (1 gpm) minimum, at 0.276 MPa (40 psi) Flow
Water chemistry is critical for a successful grip cooling. Generally speaking, municipal
drinking water that is pollution free, bacteriologically safe, and has a neutral pH is
perfectly acceptable for grip cooling. Quality
Series 647 Wedge Grip Temperature Ranges
The temperature range of the grips is determined by the type of seals used in the grips and the type of
hydraulic fluid used with the grips. The grips are available in the following temperature ranges:
• -40°C to 177°C (-40°F to 350°F)
• -130°C/315°C (-200°F/600°F)
• -130°C/540°C (-200°F/1000°F)
Not all grip models are available in all temperature ranges.
Series 647 Hydraulic Wedge Grips Reference Manual 23
Introduction