12
WARNING
The pump contains no safety locking valve
and is NOT designed to provide support while persons are
working under the load. Refer to additional information and
precautions in Section 7.7 of this manual.
6.7 4-Way, 3-Position Control Valve (EP3404J Models)
The control valve on EP3404J models is operated by a rotary
lever and has three detented positions, “A” Advance, “N” Neutral
and “B” Retract. It is designed for use with double-acting
cylinders and tools. See Figure 7.
Figure 7, Control Lever Positions - EP3404J Models
ADVANCE
A
NEUTRAL
N
RETRACT
B
• The pump motor must be on to advance or retract the cylinder
or tool.
• Moving the lever to the “A” position will direct hydraulic flow to
the advance side of the cylinder or tool.
• Moving the lever to the “N” position will block hydraulic flow
in both the “A” and “B” ports of the cylinder or tool. If the
pump is running, hydraulic flow from the pump element will be
directed back to the reservoir (tandem center valve).
• Moving the lever to the “B” position will direct hydraulic flow
to the retract side of the cylinder or tool.
• If the pump is turned-o while the lever is in the “A” or “B”
position, the cylinder or tool will stop and the pump internal
valving will hold the load in most applications. However, since
the pump contains no safety locking valve, suitable blocking
must be placed immediately under the raised load.
The pump contains no safety locking valve
and is NOT designed to provide support while persons are
working under the load. Refer to additional information and
precautions in Section 7.7 of this manual.
7.0 OPERATION
7.1 Before Start-up
1. Check the hydraulic oil level. Add oil if necessary. Refer to
Sections 10.1 through 10.3.
2.
Connect hydraulic hose(s) to pump as described in Section 5.2.
3. Connect pump to a compatible AC power supply of the
proper voltage. Input power specifications are listed on the
pump data plate and also in Section 2.1.
4. Remove air from system before placing pump into operation.
Refer to instructions in Section 7.3.
5. Check all hydraulic hoses, couplers and fittings to be sure
they are tight and leak free.
7.2 Pump Operating Positions
During operation, the pump can be positioned in the normal
horizontal position or vertically on its back cover as shown in
Figure 8.
If needed, the pump can be tilted rearward on an angle, provided
that it is adequately supported so that it does not slide, tip over
or drop.
OK OK
OK
Figure 8, Allowable Pump Operating Positions
To prevent oil leakage and/or damage to pump:
• Never operate the pump while it is positioned on its right or left
side, or in an inverted (upside-down) position.
• Never operate the pump in the tilted forward position. Oil
leakage and/or damage to pump may result.
See Figure 9.
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