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FF-MM-326-REV -01
Page 10
Operation and Maintenance Guide SDP 25 Metal Series
e. Wrap electrical tape around each leg of the
needle nose pliers (heat shrink may also be
used) . This is done to prevent damaging the
inside portion of the new seals.
f. With a new seal in hand, place the two legs of
the nose pliers inside the seal ring. Open the
pliers as wide as the seal diameter will allow,
then two fingers pull down on the top por-
tion of the seal to form kidney bean shape.
(Refer Fig. A)
g. Lightly clamp the pliers together to hold the
seal into the kidney shape. Be sure to pull the
seal into as tight of a kidney shape as possi-
ble, this will allow the seal to travel down the
bushing bore easier. (Refer Fig. B)
h. With the seal clamped in the pliers, insert the
seal into the bushing bore and position the
bottom of the seal into the correct groove.
Once the bottom of the seal is seated in the
groove, release the clamp pressure on the pli-
ers. This will allow the seal to partially snap
back to its original shape.
i. After the pliers are removed, you will notice a
slight bump in the seal shape. Before the seal
can be properly re-sized, the bump in the seal
should be removed as much as possible. This
can be done with either the Phillips screw
driver or your finger, apply light pressure to
the peak of the bump. This pressure will cause
the bump to be almost completely eliminat-
ed.
j. Lubricate the edge of the shaft with specified
lubricant.
k. Slowly insert the shaft with rotating motion.
This will complete the re-sizing of the seals.
l. Perform these steps for the remaining seals.
3. Replacement Of Secondary Shaft
Assembly
a. For removing the secondary shaft assembly
from center piece assembly, first follow the
steps a, b, c, d from the diaphragm replace-
ment and remove the outer chamber (4).
b. Repeat the same procedure to remove the
other side also.
c. Remove the Circlips (17) from Shaft housing
assembly housing (A) & take out the Sleeve
(16) by pushing it from the shaft housing
assembly (A).
d. Now remove the end O-rings (38A) from
both ends of secondary shaft assembly
(38).
e. Now if you see there is a center drill mark on
one side of the secondary shaft assembly (38).
Pull the secondary shaft assembly (38) from
this side only.
f. During assembly make sure to push the
secondary shaft assembly (38) from the plain
side only into the sleeve (16).