MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-180 - Manual (Page 90)

About Replacing the Hydraulic Fluid
Replace the hydraulic fluid in the HPU reservoir whenever you have determined that the hydraulic fluid is no
longer suitable for use.
Recommended equipment
• A transfer pump with a 10 micron filter (such as the Model 590.01 Fluid Transfer Pump) with 915 mm (36
inch) suction tube.
• Ethanol or a similar cleaning solvent
• Lint-free cloths or manufactured lint-free rags
• A hydraulic fluid sampling kit (MTS part number 055-589-601)
• A new filter
Prerequisites
• Sample the hydraulic fluid to determine if the hydraulic fluid should be replaced.
• Identify and correct any sources of contamination.
Caution:
Mixing different brands of hydraulic fluid can contaminate your system.
Contaminated hydraulic fluid can cause premature wear of the hydraulic components in your
system.
Do not mix different brands of hydraulic fluid. MTS Systems Corporation recommends using
Exxon Mobil DTE-25 or Shell Tellus 46 AW hydraulic fluid.
Procedure
Refer to the Component Identification figure as needed to identify the components called out in the following
procedure.
1. Prepare the HPU.
a) Press Stop on the user interface panel to turn off the HPU. Remove electrical power to the HPU via a
circuit breaker at the power source.
b) Open the top cover of the HPU.
c) Remove the filler cap.
2. Remove the hydraulic fluid.
90 Series 505G2 SilentFlo™ Hydraulic Power Unit Product Information
Maintenance