MTS Model 512-01 Hydraulic Power Unit - Manual (Page 18)

Model 512.01 Hydraulic Power Unit 18 Operation
5. Check to make sure the filter change gage’s needle stays in the green
zone.
NOTE Cold fluid may push it temporarily into the yellow or red zone.
If the needle stays in the yellow or red zone, turn the HPU off and
change its filter (see
“Changing the Filter” on page 24).
Do not run the HPU if the filter gage is in the red region.
When the gage needle stays in the red zone, some hydraulic fluid is
bypassing the filter. This unfiltered fluid can wear or damage hydraulic
components.
Turn the HPU off when the filter gage reaches the red zone and change the
filter.
Check the Filter Change Gage
6. Run the HPU for 1 hour to get the hydraulic fluid up to the operating
temperature of 43–52°C (109–126°F).
7. Once the hydraulic fluid is up to the operating temperature, you can
use the hydraulic system.
8. To turn the HPU off, press the STOP switch.
CAUTION
Green Zone
(normal)
Yellow Zone
(warning to change) Red Zone
(do not operate)