Packings

Disassembly

1.To access water seals for inspection or replace- ment, remove head of pump.

Note: It is important to note the order in which the components of the packing stack are arranged and facing during disassembly.

2.Remove head bolts.

3.Insert a small pry bar between head and body at opposite corners and apply pressure down on one pry bar and up on the other pry bar.

4.Lift head up and away from body.

Note: Packing stack will not always stay in head of pump when it is removed. Sometimes one or more components of the packing stack will come out of the head and stay on the plunger.

5.To remove any components that stay on plungers twist back and forth while pulling up.

6.Remove low–pressure seals by inserting a flat screwdriver under seal lip and lifting up.

7.Remove piston guides from head by using a re- verse pliers (preferably rubber coated) inserted into center of piston guide.

8.Use back and forth twisting motion while pulling up (clockwise and counter–clockwise).

9.Another method is to use a two–prong slide ham- mer puller. Insert prongs into piston guide allowing prongs to grab under support ring, then use slide hammer to pull packing stack up and out of head.

Note: Damage to piston guides and or seals may occur during removal. Inspect carefully before reusing any components of packing stack.

10.Remove high–pressure packing by pulling straight out with your finger.

Assembly

1. Install high–pressure seal into head.

Note: It should fit snugly. The packing support is part of the valve cage.

2.Place high–pressure seal at an angle and work it into cylinder.

Note: The point of the “v” or flat side of packing is pointed at you.

3.Lubricate packing retainer o–ring with a light film of oil and install it into cylinder.

4.Push it completely into place.

Note: O–ring will seat just inside manifold and you will hear a slight pop.

5.Insert low–pressure seal by placing it into cylinder at an angle and pushing it into place.

6.Put a thin coat of oil on plungers and packings.

7.Carefully install manifold and torque bolt to 443 in.–lbs (37 ft–lbs).

Note: Valve life is dependant on many variables. Hard water, cavitation, corrosion, chemicals and equipment care. The valves are a wear item and need periodic replacement. Worn o–rings or damaged valves will cause pressure loss and pulsations.

Water seals are wear items. Lift of seals is dependent on many factors. Water seals should be replaced when water leak or loss of performance is noticed. Prompt replacement of worn seals will insure peak operating performance and trouble–free operation.

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