Nova-Tech Pulsafeeder OMNI DC7 - Manual (Page 17)

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6. Remove all but one top reagent head bolt. Product will leak out between the pump head adaptor and
reagent head as the bolts are loosened.
7. Remove the final bolt and rinse or clean the reagent head with an appropriate material.
8. Insert a screwdriver or similar tool through the oil fill hole and into the hole provided in the pushrod,
this will keep the pushrod from turning as the diaphragm is removed. Note that depending on
pushrod position, you may have to rotate the motor coupling or the diaphragm to access the hole.
Figure 10, securing pushrod
9. Remove the diaphragm by turning it counter-clockwise.
10. Inspect the diaphragm. The diaphragm must be replaced if it is cracked, separated, or obviously
damaged.
11. Install the diaphragm.
a) Ensure that the critical sealing areas of diaphragm, reagent head, and pump head are clean and
free of debris.
b) Lubricate the elastomer side of the diaphragm liberally, where it is in contact against the pump
head and deflection plate. Use a silicone grease or silicone-based o-ring lubricant.
c) Coat the threads and the end of the pushrod with an anti-seize paste or lubricant.