FF-MM-405-REV - 01
Page 9
Operation and Maintenance Guide ADPB 25 Plastic Pump Series
2)
Replacement of Primary
Shaft & seals
a.
Follow the procedure a,b & c of dia-
phragm replacement and thereafter we can
pull out shaft (4) from the shaft assembly.
b.
Remove the circlip (27) of secondary
shaft (6) from both sides.
c.
Now unscrew the self tapping screws
(18) and remove the shaft cover (3).
d.
This will allow to remove the bush
(11) and oring (36). Repeat the same proce-
dure for the opposite side also.
e.
Now replace the orings (36) with new
one and assemble in reverse manner.
f.
Make sure to put the circlip (27) in
secondary shaft (6).
3)
Replacement of Ball seat &
Ball
a.
Follow the step (a) of diaphragm re-
placement. Replace the ball (14), oring (40) &
seat (41) with new one (Refer figure page 9).
4)
Replacement of seal of sec-
ondary shaft
a.
Follow the steps a,b & c of diaphragm
replacement and thereafter step b & c of pri-
mary shaft replacement.
b.
Now pull the secondary shaft (6) out
of the shaft housing (1).
c.
Now we can remove the end support
(32), spacer (8) and orings (31). Examine for
wear and replace the same.
d.
Now assemble in reverse manner as
per exploded view.
5)
Replacement of air valve and
oring of end cap
a.
Unscrew bolt (17), washer (20) & nut
(21). (Refer page 9)
b.
Remove the air valve assembly (C)
along with the gasket (7).
c.
Now push any one side of the end cap
(35) to remove the end cap assembly from
one side from the air valve body (33).
d.
Now push the air valve(34) from other
side to remove both end cap (35)along with
air valve assembly.
e.
Remove seal (30) with the help of a
flat screw driver from both sides of air valve
(34) and replace with new one.
f.
Now replace the backup rings (38)
and oring (29) from the air valve (34).
g.
Replace the oring (28) from both the
end caps (35).
h.
While assembling apply lubricants in
the bore of air valve body (33). Now push the
air valve assembly with all the seals from any
one side of air valve body (33). Care to be tak-
en so that backup rings (38) move smoothly
into the bore of air valve body (33).
i.
Now assemble the end caps with or-
ings from both sides.