Larzep W Serie Manual De Instrucciones página 6

4.5 Double-Acting Applications with 4-Way,
3 Position Manual Valve
(Models X22607, X24507 & X26507)
Pumps with 4-way control valves are designed to operate
double-acting cylinders.
See Figures 3A and 3B for valve lever positions. Valve
appearance and location will vary, depending on pump
model.
1. Position lever on 4-way valve to select function as
follows:
a. To Advance: move lever to the advance position.
b. For Neutral: move lever to the neutral position
(both advance and retract ports are blocked in this
position).
c. To Retract: move lever to the retract position.
2. Operate pump handle to deliver hydraulic power to the
system.
3. Change valve lever positions as needed.
Operate a double-acting cylinder only when
WARNING
both hoses are connected to the pump and the cylinder. If
one hose is disconnected, the circuit will become blocked
and over pressurization of the hydraulic circuit could occur.
Serious personal injury or damage to equipment or
property could result.
Valve Positions - Model
Retract
Figure 3A
X26507
Advance
Neutral
Valve Positions - Models X22607 and X24507
Advance
4.6 Air Removal
Removing air from the hydraulic system will help the
cylinder to advance and retract smoothly. Refer to the
procedure in the following steps:
1. On pumps with non-vented reservoirs, loosen the oil
fill plug. On pumps with vented reservoirs, loosen the
vent screw.
2. • Single-acting pump models: Close the release valve
or move the control valve lever to the advance position.
• Double-acting pump models: Move the control valve
lever to the advance position.
3. Position the hand pump at a higher elevation than the
cylinder.
4. For single-acting pump models, position cylinder with
the hydraulic port end located higher than the moving
end. For double-acting hand pump models, position
cylinder so that the hydraulic ports are facing upward.
Refer to diagrams in Figure 4 for reference.
Note: Operate pump handle as required during the
following steps.
5. • Single-acting pump models: Fully advance the
cylinder. Then open the release valve or move the
valve lever to the retract position to retract the cylinder.
• Double-acting pump models: Fully advance the
cylinder. Then move the control valve to the retract
position and fully retract the cylinder.
6. Repeat steps 2 through 5 as necessary until all of
the air is expelled from pump's hydraulic circuit and
cylinder motion is smooth and responsive with each
stroke of the pump handle.
6
Neutral
Retract
Figure 3B