MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-180 - Manual (Page 91)

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 ethanol. 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.
a) Turn on power to the HPU. Rotate the power disconnect switch to the on (|) position.
b) Select Main Panel from the Startup screen.
c) Press Reset on the Main Panel to clear interlock conditions resulting from applying power to the HPU.
d) Press Run/Low Pressure on the Main Panel.
e) Run the HPU at low pressure for about three hours to filter the new hydraulic fluid.
f) Press the High Pressure button to select the high pressure mode. Check the HPU for fluid leaks.
g) Press Stop.
h) Check for a Filter Dirty indication on the HPU Run Status indicator on the Main Panel. Replace the
filter element and continue to filter the fluid as needed.
Inspect the Heat Exchanger
Prerequisite
Perform an external inspection of the heat exchanger after every 500 hours of operation (see Step 2 below).
Perform an internal inspection of the heat exchanger after every 2000 hours of operation or when you notice
a decrease in the heat exchanger performance. Refer to the Heat Exchanger Care Guide (part number
015-164-000) for additional information on heat exchangers and causes of heat exchanger failure.
Series 505G2 SilentFlo™ Hydraulic Power Unit Product Information 91
Maintenance