Dixon 5500 Series Maintenance & Operating Instructions - Page 10

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shaft (2) into the shaft end pocket on the body (1). Pay attention to the orientation of the

valve assembly.

7. Rotate the handle (10) to fully closed position. Install the shaft cotter pin (3) onto the shaft (2).

8. Check the API rack coupler with an API adapter to make sure all components are

assembled properly.

REPLACE SEALS:

Warning: Carefully remove and install parts without damaging any sealing surfaces when

replacing seals. Even the smallest scratches on the O-Ring groove or other sealing surface will

cause leakage.

REPLACE SHAFT SEALS IN STUFFING BOX

Note: While the API rack coupler is off the rack, shaft seals (7.2, 7.3, 7.4, 7.5 and 28) can be

replaced using the method described here.

1. Follow Step 1 to 4 from "REPLACE VALVE ASSEMBLY AND PARTS".

2. To remove bearing assembly (7), unscrew the lock nuts (22) and remove the shoulder screw

(21) from the handle (10) and shoulder screw (27) from the sleeve lock (26). Remove the

handle (10) from the shaft (2) followed by the sleeve lock (26), locking plate (9), dust O-ring

(28), the bearing assembly (7) and bearing washer (8).

3. Remove the O-rings (7.2, 7.3) and the u-seals (7.4, 7.5, optional) from the bearing assembly

and make sure not to damage the bearing (7.1) or scratch sealing surfaces.

• If the bearing (7.1) is good, thoroughly clean the bearing (7.1) to remove any debris, oil

and grease. Lubricate NEW O-Rings (7.2 for inside groove and 7.3 for outside groove)

and install into the grooves. If u-seals (7.4, 7.5) are ordered, lubricate NEW u-seals (7.4

for inside groove and 7.5 for outside groove) and install into the grooves. Handle the u-

seals (7.4, 7.5) carefully and make sure not to damage.

• If the bearing (7.1) is already damaged or has scratches on the sealing surfaces, replace

the bearing assembly with a NEW bearing assembly, which includes the bearing (7.1),

the inside O-Ring (7.2), the outside O-Ring (7.3), the inside u-seal (7.4, optional) and the

outside u-seal (7.5, optional).

4. Install bearing washer (8) into the shaft (2) followed by the bearing assembly (7) and dust O-

ring (28) make sure it is greased, locking plate (9), sleeve lock (26) and then the handle

(10). Align the sleeve lock (26) and handle (10) to the shaft (2) holes and insert the shoulder

screws (21 & 27) then tighten the lock nuts (22).

5. Push the end of the shaft to the body through the inside shaft washer (29), drive link (5.6)

and spacer (11). At this instance the bearing assembly is also getting in to the stuffing box of

the body. Push the shaft assemble shaft (2) end to the shaft pocket on the body (1). Pay

attention to the orientation of the valve assembly.

6. Rotate the handle (10) to fully closed position. Install the shaft cotter pin (3) onto the shaft (2).

7. Check the API rack coupler with an API adapter to make sure all components are

assembled properly.

REPLACE THE SEALS ON THE NOSE PIECE

Note: Nose piece seals, including O-Ring (6.2), nose piece dust ring (6.4) and optional u-seal (6.5),

can only be replaced when the API rack coupler is off the rack.

1. Follow Step 1 to 4 from "REPLACE VALVE ASSEMBLY AND PARTS".

2. Remove the nose piece assembly, which includes the nose piece (6.1), nose seal (6.3), O-

Ring (6.2), nose piece dust ring (6.4), u-seal (6.5, optional). Remove and clean the

compression springs (23).

090140 REV5 2021/12/15

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