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2. Remove the motor fan cover and turn the motor by hand while adjusting the capacity control knob
to 100%. With the capacity set at 100%, turn the motor fan until the diaphragm is in the full forward
position (top dead center).
3. Hold the outer edge of the diaphragm and turn it counterclockwise to unscrew it from the pump drive.
4. Discard and replace with new diaphragm. Make sure that diaphragm support ring (Item 700A in Fig-
ure 5-3) is in place. Holding the edges of the diaphragm, screw the diaphragm assembly onto the
male thread of the connecting rod (Item 60 in Figure 5-1) until it reaches its mechanical stop.
5. With the capacity still set at 100% turn the motor fan until the new diaphragm is in the farthest
rearward position (bottom dead center).
6. Reattach the diaphragm head with the suction and discharge ports in the correct positions. Tighten
the screws in a crosswise pattern to a torque of 45 in-lb.
7. While turning the motor fan, set the stroke adjustment knob to the 0% position.
8. Reinstall motor fan cover.
4.6.2 DIAPHRAGM REPLACEMENT: LIQUID END SIZE GM0090~GM0500
(SEE FIGURES 5-13, 5-14, 5-15)
1. Mark the suction and discharge ports on the diaphragm head prior to removal. Loosen the head
screws (435) and remove the diaphragm head (370).
2. Remove the motor fan cover and turn the motor by hand while adjusting the capacity control knob
to 100%. With the capacity set at 100%, turn the motor fan until the diaphragm is in the full forward
position (top dead center).
3. Hold the outer edge of the diaphragm and turn it counterclockwise to unscrew it from the pump drive.
4. Make sure that diaphragm support nut is clean and free of corrosion. When cleaning the support nut,
take care not to scratch the smooth angled surface of the support nut. If corrosion cannot be removed
without damaging the support nut, replace with a new diaphragm assembly.
5. Make sure that diaphragm support ring (700A) is in place and then reinstall diaphragm assembly.
6. Make sure that spring and cross piece is in place and connecting rod is in full-forward position (at
100% capacity setting). Screw diaphragm assembly into connecting rod cross piece (Item 701 in Fig-
ure 5-13) until it reaches its mechanical stop.
7. With the capacity still set at 100% turn the motor fan until the diaphragm is pulled back to the
rearward position (bottom dead center).
8. Reattach the diaphragm head with the suction and discharge ports in the correct positions. Torque
the head assembly screws in a crosswise pattern as follows:
a) Liquid End Size GM0002~GM0050 to 45 inch pounds.
b) Liquid End Size GM0090~GM0500 to 90 inch pounds.
9. While turning the motor fan, set the stroke adjustment knob to the 0% position.
10. Reinstall motor fan cover.
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