Service
4.Loosen but do not remove the diaphragm shaft bolts (107), using a 15 mm socket wrench (1 in. on stainless steel models) on both bolts. NOTE: This step does not apply to pumps with overmolded diaphragms.
5.Unscrew one bolt from the diaphragm shaft (24) and remove the
For overmolded diaphragms: Grip both dia- phragms securely around the outer edge and rotate counterclockwise. One diaphragm assembly will come free and the other will remain attached to the shaft. Remove the freed diaphragm and air side plate.
6.Pull the other diaphragm assembly and the dia- phragm shaft (24) out of the center housing (1). Hold the shaft flats with a 19 mm
For overmolded diaphragms: Pull the other dia- phragm assembly and the diaphragm shaft (24) out of the center housing (1). Hold the shaft flats with a 19 mm
7.Inspect the diaphragm shaft (24) for wear or scratches. If it is damaged, inspect the bearings (19) in place. If the bearings are damaged, refer to page 20.
8.Reach into the center housing (1) with an
9.Clean all parts and inspect for wear or damage. Replace parts as needed.
Reassembly
1.Install the shaft
2.Install the diaphragm assembly on one end of the shaft (24) as follows. For pumps with overmolded diaphragms, go directly to step g.
a.Install the
b.Install the fluid side diaphragm plate (105) on the bolt so the rounded side faces in, toward the diaphragm (401).
c.On PTFE models only, install the PTFE dia- phragm (403*). Make certain the side marked AIR SIDE faces the center housing (1).
d.Install the diaphragm (401*) on the bolt. Make certain the side marked AIR SIDE faces the center housing (1).
e.Install the air side diaphragm plate (104) so the recessed side faces the diaphragm (401).
f.Apply
g.For overmolded diaphragms: Assemble the air side plate (104) onto the diaphragm (403). The wide, radiused side of the plate must face the diaphragm. Apply
3.Grease the length and ends of the diaphragm shaft (24), and slide it through the housing (1).
4.Assemble the other diaphragm assembly to the shaft as explained in step 2.
5.Hold one shaft bolt (107) with a wrench and torque the other bolt to
6.Align the fluid covers (101) and the center housing
(1) so the arrows (A) on the covers face the same direction as the air valve (B). Apply medium- strength (blue) LoctiteR or equivalent to the threads of screws (106) and (112), and secure the covers with the screws handtight. Install the longer screws (112) in the bottom holes of the covers. See Fig. 11. Using a 13 mm socket wrench, torque the screws oppositely and evenly to
7.Reassemble the ball check valves and manifolds as explained on page 16.
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