MTS Model 512-14 Hydraulic Power Unit - Manual (Page 7)

Component Identification
512.14 Hydraulic Power Unit Introduction 7
Component Descriptions
Component Description
Control Box Houses the electronic controls of the pump, including the Stop button, and
Low/High switch. It also houses the thermal overloads to protect the pump
motor. See
“Resetting the Thermal Overloads” on page 24.
Pressure Gage Shows the current output pressure from the hydraulic power unit. The output
pressure is factory set to 21MPa (3000 psi). See “Adjusting the Output
Pressure” on page 25 to change the output pressure.
Sight Glass Combines a thermometer with a sight glass. You can quickly check the
hydraulic fluid’s temperature, level, and condition (by its color).
Reservoir Stores the hydraulic fluid. The reservoir has a 57 L (15 gal) capacity. It
includes a magnetic drain plug to help catch metal particles.
Heat Exchanger Cools the hydraulic fluid. The heat exchanger can be either water-cooled or air-
cooled. See
“Adjusting the Air Flow” on page 22 and “Adjusting the Water
Flow” on page 23 for more information.
Filter Provides 3–micron filtration to fluid returning to the reservoir (see “Replacing
the Filter” on page 31).
Low Fluid and
Overtemperature Sensor (Not shown) Shuts the pump off if fluid gets too low or becomes hotter than
75ºC (160ºF). See “Reducing the Fluid Temperature” on page 21 or “Adding
Hydraulic Fluid” on page 35 for more information.
Filter Change Gage Shows when it’s time to change the hydraulic filter. The gage is marked with
three zones; green, yellow, and blue.
Green—The filter is good to use.
Yellow—Change the filter soon.
Red—Do not run the HPU until you have replaced the hydraulic filter element.
Pump Motor Drives a fixed displacement gear pump.
Pumps a 12.5 lpm output at 21 MPa (3.3 gpm at 3000 psi) @ 50 Hz.
Pumps a 15.1 lpm output at 21 MPa (4 gpm at 3000 psi) @ 60 Hz.