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7) Replacing DA-121D and DA-241S O Rings
It is recommended that these O rings be replaced at the same time as the diaphragms.
Use tools 1, 2, 3, 4, 5, and 6 listed above.
(1) Remove the valve retainers as described in 3) Replacing DA-121D Valves, steps (1)~(2).
(2) Remove the old P-48 O ring as shown in Photo 11 and wipe the O ring groove with
solvent.
(3) Wipe a thin layer of vacuum grease evenly over the new O ring, and place it in the O ring
groove.
(4) Remove the inlet and outlet pipes with the spanner and remove the old O ring shown in
Photo 12.
(5) Wipe the inlet and outlet pipes with solvent.
(6) Wipe a thin layer of vacuum grease evenly over the new O rings, and fit them to the inlet
and outlet pipes.
(7) Fit valve retainer 1-1 and 1-2 to the inlet and outlet pipes.
Note: On the DA-241S, fit valve retainer 2-1.
Note: Tighten the valve retainers until they are in contact with the inlet and outlet pipes.
(8) Using a long, thin hook, remove the N-15 O rings from the sides of the valve retainers 1-1
and 1-2. See Photo 11.
Note: On the DA-241S, remove the four O rings from the holes in the sides of the
valve retainers 2-1 and 2-2.
(9) Wipe a thin layer of vacuum grease evenly over the new O rings, and fit them in the
holes in the sides of valve retainers 1-1 and 1-2. See Photo 12.
Note: On the DA-241S, fit the four O rings in the holes in the sides of the valve
retainers 2-1 and 2-2.
(10) Assemble the valve retainer and pump head while referring to 3) Replacing DA-121D
Valves.
Photo 13
Photo 14
P-18 O rings
Photo 15
Photo 16
N-15 O ring
N-15 O ring
P-48 O rings
P-48 O rings
