GPU 18-8 Hydraulic Power Unit
7
Hose Connections
Do not disconnect tool, hoses or fittings while the power unit is running or if the hydraulic fluid is hot. Expo-
sure to hot hydraulic fluid can cause serious burns.
Figure 3
Hydraulic Schematic
Figure 3 shows the power unit being used with a typical
tool.
Connecting Hoses (See Figures 1, 2 and 3)
1.
Stop the power unit hydraulic flow.
2.
Connect the return (tank) hose from the power unit
port to the tool return port (T).
Note: Return (tank) hose connection should always
be connected before pressure (supply) hose
connection to prevent pressure buildup inside the
tool.
3.
Connect the pressure (supply) hose from the power
unit pressure port to the tool pressure port (P).
Disconnecting Hoses (See Figures 1, 2 and 3)
1.
Stop the power unit hydraulic flow.
2.
Disconnect the pressure (supply) hose from the
power unit pressure port to the tool pressure port
(P).
Note: Pressure (supply) hose connection should
always be disconnected before return (tank)
hose connection to prevent pressure buildup
inside the tool.
3.
Disconnect the return (tank) hose from the power
unit return port to the tool return port (T).
4.
To prevent contamination, always install dust caps
over the hydraulic ports of the tool, hoses, and
power unit when disconnected.
TYPICAL
TOOL
PRESSURE
PORT (P)
RETURN
PORT (T)
RETURN
PORT (T)
PRESSURE
PORT (P)
CONTROL VALVE
FLOW
METER
RELIEF
VALVE
2000 PSI
OIL
COOLER
FILTER
(10 micron)
ENGINE
PUMP
POWER
UNIT