MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-11 - Manual (Page 44)

Model 505.07/.11 SilentFlo™ HPU 44
Adjusting the Hydraulic Pressure
Operation
1. Turn the main disconnect switch counterclockwise to remove power from
the electrical control box.
2. Loosen the two bolts securing the door of the electrical enclosure and open
the door.
3. Locate the thermal overload switch. Press the Reset button to clear the
switch. If the thermal overload switch trips again, wait until it cools.
Adjusting the Hydraulic Pressure
The output pressure can be adjusted from a low pressure value of 1 MPa (145
psi) to the factory setting of 21 MPa (3000 psi). If you have a special testing
requirement, you can reduce the HPU output pressure. If you do so, you should
also adjust the Auto-Cooling Valve.
Control Locations
To change the output pressure, see the appropriate procedure.
Perform the procedure for adjusting the auto-cooling level if the adjusted output
pressure is between 14 MPa (2000 psi) and 21 MPa (3000 psi) and the HPU will
be operated in high pressure mode for an extended period of time (longer than 10
minutes).
Output
Pressure
Control
Control Manifold
(shown rotated)
Return Line
Hose
Output
Pressure
Gage
Auto-Cooling
Valve