User Manual

Model 512.04 Hydraulic Power Unit
8
Introduction
Component Identification
This table describes the components shown in the figure on page 9.
Component Descriptions
C
OMPONENT
D
ESCRIPTION
Control Box
Houses the electronic controls of the pump, including the Stop button,
Low/High switch, and Reset button. It also houses the thermal
overloads to protect the pump motor. See “Resetting the Thermal
Overloads” on page 26.
Pressure Gage
Shows the current output pressure from the hydraulic power unit. The
output pressure is factory set to 13.8 MPa (2000 psi). See “Changing the
Output Pressure” on page 27 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.
Filter
Provides 3–micron filtration to fluid returning to the reservoir (see
“Changing the Filter” on page 30).
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 22 or
“Adding Hydraulic Fluid” on page 25 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 13.8 MPa (3.3 gpm at 2000 psi) @ 50 Hz.
Pumps a 15.1 lpm output at 13.8 MPa (4 gpm at 2000 psi) @ 60 Hz.