MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-180 - Manual (Page 64)

Dirty filter
A dirty filter interlock is indicated on the Main screen by a yellow Alarm indicator and a blue Status indicator.
Press the Status button to display the Status screen and note the yellow Return Filter Dirty or Press(ure)
Filter Dirty indicator(s). The interlock is generated when the filter capacity has reached a critical level. A dirty
filter condition will prevent the HPU from being started, but it will not stop the HPU while it is running.
1. Replace the dirty hydraulic fluid filter. Refer to procedures for return line filter replacement and high pressure
filter replacement as required.
2. Press Reset to clear the interlock and turn the indicator off.
Changing the Water Flow
On water-cooled units, water is used to maintain hydraulic fluid temperature. (See Air-Cooling Product
Information manual, MTS part number 100-135-073, regarding air-cooled units.) The water regulating valve,
located on the water inlet line of the HPU, senses the hydraulic fluid temperature and automatically controls
water flow to the heat exchanger.
Note:
When the HPU is turned off, a solenoid valve also shuts off the flow of water to the heat exchanger.
The water-regulating valve is adjusted at MTS Systems Corporation to maintain the hydraulic fluid temperature
within the range of 43–49°C (110–120°F). However, the temperature of your water might require you to
readjust the regulator.
Description Item
Water inlet 1
Solenoid Valve 2
Water Regulating Valve 3
Filter Assembly 4
64 Series 505G2 SilentFlo™ Hydraulic Power Unit Product Information
Operation