MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-180 - Manual (Page 102)

Model 505.60 - 505.180 SilentFlo™ HPU 102
Replacing the Hydraulic Fluid
Maintenance
Prerequisites
• Sample the hydraulic fluid to determine if the hydraulic fluid should be
replaced.
• Identify and correct any sources of contamination.
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.
A. Use the transfer pump to remove the old hydraulic fluid from the
reservoir and into an appropriate container.
B. Remove the motor/pump cover assembly as needed to clean the
reservoir.
C. Drain the hydraulic fluid from hoses and accumulators in the system.
3. Clean the inside of the reservoir using clean cloths dampened with Synasol.
Clean the pump, motor, and bottom of the cover plate as well.
4. Use a dry, lint-free cloth to wipe away the solvent.
5. Install the motor/pump cover assembly.
6. Replace the HPU filter element(s). Refer to the Return Line Filter
replacement procedure.
7. Add new hydraulic fluid to the reservoir.
A. Replace the filter in the transfer pump and transfer fresh hydraulic fluid
(filtered to 10 microns) into the reservoir. Stop when the fluid level gets
close to the full mark on the gage.
B. Reinstall the filter cap’s strainer assembly.
8. Run the HPU.
CAUTION