MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-30 - Manual (Page 50)

Model 505.20 - 505.30 SilentFlo™ HPU 50
Adjusting the Auto-Cooling Level
Operation
3. Adjust the Auto-cooling Valve by slowly turning the valve counter
clockwise. When the valve shifts, a sudden change in pitch will be heard
from the pump.
A. Reversing the valve adjustment a number of times will aid in
identifying the proper setting.
B. Make a final counter-clockwise adjustment, an increase in pump pitch
will be heard that corresponds with the opening of the valve.
C. Stop adjusting at this point.
4. Confirm the auto-cooling valve setting by slowly cycling the HPU Output
Pressure Control. Decrease the HPU output pressure and note a decrease in
pump pitch when the valve closes.
A. At the point when the valve closes the pressure on the gage will
momentarily hesitate during the adjustment.
B. Increase the pump output pressure to the desired pressure setting and
note an increase in pump pitch when the valve opens. Once again the
pressure gage will show a momentary hesitation when the valve opens.
5. If necessary, repeat Steps 2 and 3 until the auto-cooling valve is stable and
the HPU cools properly.
6. After the final adjustment, hold the HPU Output Pressure Control to
prevent it from moving while tightening the nut to secure the setting.
7. Verify the output pressure remained at the desired level.
8. Hold the Auto-cooling Valve stem to prevent it from turning while
tightening the nut to secure the setting.