MTS Model 512-01 Hydraulic Power Unit - Manual (Page 19)

Model 512.01 Hydraulic Power Unit Maintenance 19
Maintenance
Contents
Reducing the Fluid Temperature 20
Resetting the Thermal Overloads 22
Adjusting the Output Pressure 23
Changing the Filter 24
Changing the Hydraulic Fluid 25
Abnormal
shutdowns
Any one of the following can cause your HPU to suddenly shut down. You
will not be able to restart your HPU until you correct the condition.
Maintenance Intervals
W HAT TO D O W HEN TO D O I T
Recover from an abnormal shutdown as needed–when the HPU suddenly stops running
Lower the output pressure as required by your test needs
Lubricate the pump motor every six months
Change the filter when the filter gage needle stays in the yellow or red zone;
whenever you change hydraulic fluid
Change the fluid Verify the fluid condition by analysis or if the fluid’s condition
becomes poor
P ROBLEM S OLUTION
The hydraulic fluid exceeds
55ºC (130ºF). See “Reducing the Fluid
Temperature” on page 20.
The hydraulic fluid cannot be seen in
the sight glass (or it is at a low level). See “Adding Hydraulic Fluid” on
page 21.
A tripped thermal overload or blown
fuse in the control box removed
power from the unit. See “Resetting the Thermal
Overloads” on page 22.