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7.2. Changing diaphragm
Tools Required
- Lithium-base grease (non-freezing silicone grease)
- 13 mm wrench
- 5 mm allen key
- 10 mm wrench
- Torque wrench
1- Relieve the pressure.
2- NRemove the manifolds and disassemble the ball check valves as explained in Ball Check
Valve Repair section.
3- Using a 5 mm allen key, remove the bolts holding the fluid covers to the main covers. Pull the
fluid covers off the pump.
4- Loosen both the diaphragm shaft bolts using a 13 mm wrench, and remove one bolt but not
both.
5- Remove o-ring, Teflon® diaphragm (if applicable) and rubber diaphragm.
6- Pull the other diaphragm assembly and the diaphragm shaft out of the center housing. Hold
the shaft with a 13 mm open–end wrench, and remove the bolt from the shaft.
7- Disassemble the remaining diaphragm assembly.
8- Inspect the diaphragm shaft for wear or scratches. If it is damaged, inspect the bearings in
place.
9- Remove the tap which holds the pilot shaft and diaphragm shaft.
10- Clean all parts and inspect for wear or damage.
11- There is text on the air side of the diaphragm.
12- Grease the diaphragm shaft lightly.
13- In the Teflon Diaphragmed pumps, Rubber diaphragm is protected by putting a teflon
diaphragm to the side that meets the fluid.
14- Re-sssemble the parts in reverse order.
15- Tighten the screws applying the proper torque from the torque chart. (Fig. 7)
WARNING!
Transferred liquid enters the air chamber of the pump when the
diaphragm ruptures. Liquid can damage the pilot valve o-rings and
the air valve o-rings due to its chemical behaviour. For this reason
you must check and replace (if needed) the o-rings while you are
changing the diaphragm. If only the diaphragm is changed that will
not constitute good maintenance and you can have a pump
problem soon.
Figure 11- Diaphragm change
15
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