7
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
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.
Figure 3B
Valve Positions - Models P140D, P143D,
P300D & P301D
Advance
Neutral
Retract
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 or petcock.
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.
Air Removal
Single-acting
Double-acting
Figure 4
4.7 Pressure Relief Valve
All pumps contain a factory set relief valve to prevent
over-pressurization. Do not attempt to readjust, disable or
modify this valve.
5.0 MAINTENANCE
5.1 Hydraulic Reservoir
Check oil level regularly. Drain oil and refill with Simplex
hydraulic oil every 12 months. If pump is used in dirty
environments, change the oil more often.
Use only genuine Simplex hydraulic oil or a comparable
high quality ISO 32 hydraulic oil having the same technical
characteristics.
The use of any other fluid could damage the seals or
equipment and will make the product warranty null and
void.
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