MTS Model 512-01 Hydraulic Power Unit - Manual (Page 23)

Model 512.01 Hydraulic Power Unit Maintenance 23
Adjusting the Output Pressure
The hydraulic power unit (HPU) comes with its output pressure set at
6.9 MPa (1000 psi) and a pressure relief setting of 7.9 MPa (1150 psi).
Special testing needs may require you to lower this pressure.
Pressure Adjustment Locations
Do not set the output pressure higher than 6.9 MPa (1000 psi).
Setting the output pressure above 6.9 MPa (1000 psi) can damage the pump
and its motor.
Set the output pressure no higher than 6.9 MPa (1000 psi).
1. Put the HPU into a no-flow condition (where no fluid is flowing to
other hydraulic equipment).
2. Press the Start button on the control box.
3. Wait for the fluid to reach the operating temperature of 43 and 52ºC
(109 and 126ºF).
4. Hold the setscrew in the
pressure reducing valve with a
5/32–inch hex key. Loosen the
locknut with a 9/16–inch
wrench.
5. Turn the setscrew while
watching the gage until you get
the output pressure you want.
6. Hold the setscrew and tighten
down the locknut.
Output Pressure
Adjustment Factory
Set to 6.9 MPa
(1000 psi)
Pressure Relief Valve
Factory Set to
7.9 MPa (1150 psi)
CAUTION
Locknut
Setscrew
Pressure Gage