Enerpac MS-Series pumps - Manual (Page 5)

NOTE: When operating the pump in the vertical
position, the hose end must be pointed down, or the
pump will pick up air and will not build pressure properly.
5.0 OPERATION
5.1 Before Using the Pump
1. Check all system fittings and connections to be
sure they are tight and leak free.
2. Check oil level in reservoir before operating
pump. See "Adding Oil to the Pump" on page 7.
CAUTION: NEVER add extensions to
pump handle. Extensions cause
unstable pump operation.
WARNING: In certain situations the
pump handle can "kick back". Always
keep your body to the side of the pump,
away from the line of force of the handle.
NOTE: To reduce handle effort at high pressure, take
short strokes. Maximum leverage is obtained in the
last 5° of stroke.
5.2 Using Two-Speed Pumps
These pumps provide 2-stage flow. Under no-load,
the pump operates in the high flow first stage for
rapid advance. When the load is contacted, the pump
automatically shifts to the second stage for building
pressure. For P-462 or P-464 models, when pump
pressure reaches approximately 200 psi [14 bar], you
must momentarily stop pumping and raise the handle
to shift to the high pressure stage. For P-802 or
P-842 models, when pump pressure reaches
approximately 400 psi [28 bar], you must momentarily
stop pumping and raise the handle to shift to the high
pressure stage. After the pump shifts, pumping takes
less effort.
NOTE: For best performance, operate pump handle
at moderate speed during the high flow first stage.
Rapid handle speed in the first stage will prevent the
pump from delivering full volume of oil.
5.3 Single-Acting Applications with
Release Valve
1. Close release valve by turning clockwise, as
shown in Figure 6.
Figure 6
CAUTION: Close release valve finger
tight ONLY. Using tools on release valve
can damage it and cause the pump to
malfunction.
2. Operate pump handle to deliver hydraulic power
to system. Pressure will be maintained until
release valve is opened.
3. Open release valve (turn counter-clockwise) to
release pressure, allowing oil to flow back to the
reservoir.
5.4 Single-Acting Applications with 3-Way,
2 Position Manual Valve
1. Shift valve handle to position 1 as shown in Figure 7.
2. Operate pump handle to deliver hydraulic power
to the system. Pressure will be maintained until
the valve is shifted.
3. To allow oil to return to the reservoir, shift valve
handle to position 2.
Figure 7
5.5 Double-Acting Applications with 4-Way,
3 Position Manual Valve
Pumps with 4-way control valves are designed to
operate double-acting cylinders. See Figure 8 for
valve positions.
Figure 8a
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