MTS Model 512-14 Hydraulic Power Unit - Manual (Page 31)

Replacing the Filter
512.14 Hydraulic Power Unit Maintenance 31
Replacing the Filter
The filter element of the HPU should be replaced for the following reasons:
• When the filter change gage’s needle stays in the yellow or red zone with the
hydraulic fluid at operating temperature
• Whenever the hydraulic fluid is changed
• The filter manufacturer’s recommended maximum interval has passed
(1000 hours or 6 months)
Prerequisite You will need an oil filter wrench and a 3–micron oil filter (MTS part number
119515-21).
Procedure Perform the following procedure to change the filter element.
1. Press STOP to turn off the HPU.
2. Check the output pressure gage. Ensure that the pressure is at zero before
proceeding.
3. Use an oil filter wrench to loosen the old filter. Screw the filter
counterclockwise to remove it.
4. Wet the new filter’s gasket with clean hydraulic fluid.
5. Screw the filter clockwise to install it. Turn the new filter until the gasket
touches its sealing surface, then hand tighten the filter 1/2 turn.
Note Tightening the filter with a wrench will not make it seal better, but it will
make it more difficult to remove.
6. Start the pump in low to purge the air from the hydraulic lines and
components.
7. Set the HPU’s output to HIGH PRESS. Let the HPU run a few minutes and
check for leaks.
CCW
Change Filter when
needle stays in
yellow or red zone