MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-11 - Manual (Page 59)

Replacing the Return Line Filter
Model 505.07/.11 SilentFlo™ HPU Maintenance 59
5. Check and adjust the hydraulic fluid delivery system so that:
• Hydraulic fluid temperature stabilizes within the parameters given in
the Specifications table when the HPU is operating at high pressure.
• Pressure line reading is maintained at 21 MPa (3000 psi) maximum
static value.
• Maximum drain line back pressure is limited to 0.1 MPa (15 psi).
If you need to adjust the water-regulating valve, overtemperature switch or
pressure control valves, see the procedure for Changing the Water Flow.
Replacing the Return Line Filter
The filter element of the HPU should be replaced for the following reasons:
• When the dirty-filter indicator lights
• Whenever the hydraulic fluid is changed
• The maximum interval recommended by the filter manufacturer has passed
(1000 hours or 6 months)
Prerequisite
You will need a filter element (MTS part number 100-009-495) or a filter kit
(MTS part number 100-030-195).
Procedure
To change the filter element:
Note The dirty-filter indicator may light when the HPU is first started due to low
hydraulic fluid temperature. When the HPU is at normal operating
temperature, recheck the indicator to determine if the element actually
needs replacement.
1. Turn off the HPU.