Power Team 62072 - Acting 2; Two-Way Valve; Four-Way Valve; Preventive Maintenance

Page No. 8
Issue Date: Rev 14 28 May 2012
Operating Instructions Form No. 102842
1. Two-way Valve
Pumps with a two-way valve are for use with singleacting cylinders.
A. 1. To extend the cylinder, turn the valve knob counterclockwise to a closed (seated) posi-
tion. Note: Hand tight only! Work the pump handle up and down to build pressure.
B. 2. 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 uid is directed to the top uid port. To maintain (hold) pressure, stop the pump-
ing action. When the valve handle is in the center position, uid ow is blocked to both ports.
WARNING
The operator should always release the pressure slowly.
PREVENTIVE MAINTENANCE
IMPORTANT
Any repair or servicing that requires dismantling the pump must be performed in a dirt-free
environment by a qualied 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 uid level instructions for your reservoir
type to release the air from the reservoir and top off the uid supply.
2. Bleeding Air From The Pump
When the pump is rst put into use, or after relling 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).