1� Two-Way Valve; 2� Four-Way Valve; Preventive Maintenance; 1� Bleeding Air From The System - SPX FLOW Power Team P12 Series Operating Instructions Manual

Operation Continued
1. Two-way Valve
Pumps with a two-way valve are for use with single acting cylinders�
A� To extend the cylinder, turn the valve knob counterclockwise to a closed (seated) position. Note: Hand
tight only! Work the pump handle up and down to build pressure.
B� To release pressure, open the valve slowly by turning the knob clockwise to control the load.
2. Four-way Valve
Pumps with a three-position, four-way valve are for use with double-acting cylinders. The hose
connection for extending a cylinder can be made to either port. With the handle in the forward position, the
fluid is directed to the top fluid port. To maintain (hold) pressure, stop the pumping action. When the valve
handle is in the center position, fluid flow is blocked to both ports.
WARNING
The operator should always release the pressure slowly�
IMPORTANT:
Any repair or servicing that requires dismantling the pump must be performed in a dirt-free
environment by a qualified technician.
Lubrication
Apply lubricant regularly to all pivot and rubbing points�
Use a good grade of No� 10 motor oil or grease� Do not use dry lubricants�
1. Bleeding Air From the System
Air can accumulate in the hydraulic system during the initial set-up or after prolonged use, causing the
cylinder to respond slowly or in an unstable manner� To remove the air:
A� Position the cylinder at a lower level than the pump, and turn the cylinder rod end down.
B� Extend and retract the cylinder several times without putting a load on the system� Air will be released
into the pump reservoir. Follow the fluid level instructions for your reservoir type to release the air from
the reservoir and top off the fluid supply.
2. Bleeding Air From The Pump
When the pump is first put into use, or after refilling the pump's reservoir it may be necessary to bleed any
trapped air from the pump� If this is not done the pump will not function properly (will not build pressure or
has very spongy operation)�
To bleed air from the pump, turn the pressure control knob counterclockwise (CCW) (turn lever down or
clockwise on P460 models) and operate the pump handle up and down approximately twenty times. Turn
the pressure control knob clockwise (CW) to its full stop position (turn lever up or CCW on P460 models).
The pump should now be bled of air and ready to use�
© SPX FLOW, Inc.

PREVENTIVE MAINTENANCE

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Form No. 102842
Rev. 18 May. 26, 2022