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Service
Overmolded PTFE Diaphragms
NOTE: If your pump uses standard diaphragms, see
page 16.
Disassembly
1. Follow the Pressure Relief Procedure, page 11.
2. Remove the manifolds and disassemble the ball
check valves as explained on page 16.
3. Remove the clamps (6) holding the fluid covers (1)
to the air covers (21). Pull the fluid covers (1) off the
pump. See F
. 8.
IG
4. Once the fluid covers are removed, the diaphragm
on the side of the pump which was last pressurized
with air will be separated from the center section/air
cover. This allows you to grip the diaphragms.
5. Diaphragms are assembled handtight. To loosen,
grip both diaphragms 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
(20) and air side plate (25).
6. Pull the opposite diaphragm assembly and shaft
(105) out of the center housing. Hold the shaft flats
with a 19 mm open end wrench and remove the dia-
phragm and air side plate from the shaft.
7. Clean all parts and replace as needed.
18
20
25
A
1
Apply appropriate waterproof sanitary lubricant to the threads
and inside of clamp.
2
Torque to 7.9 N•m (70 in-lb).
3
Flat side must face toward shaft.
F
. 8: Overmolded PTFE Diaphragm
IG
Reassembly
NOTE: When instructed to grease, apply appropriate
waterproof sanitary lubricant.
To reduce the risk of serious injury, including amputa-
tion, do not put your fingers or hand between the air
cover and the diaphragm.
1. Assemble the air side plate (25) onto the diaphragm
(20). The wide, radiused side of the plate must face
the diaphragm. Screw the assembly (diaphragm
and plate) onto the shaft (105) hand tight.
2. Grease the length and ends of the diaphragm shaft
(105). Insert the shaft/diaphragm assembly into one
side of the pump.
3. Assemble the other diaphragm assembly to the
shaft as explained in Step 1.
4. Push the assembly down on the work surface to
raise the diaphragm up and out so the edges can be
gripped. Hand tighten the second diaphragm onto
the shaft.
3
6
105
6
1
2
1
ti17651a
819.0416
1
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