7.4.3 HPV Removal and Replacement - A & B Pump head Style
Use the following procedure for a HPV Removal and Replacement (A & B Pump
head Style)
1. Remove the reagent head and diaphragm and drain hydraulic oil from the eccentric box.
2. Remove the four bolts on the front eccentric box flange which retain the pump head. The
piston return spring is under compression and will force the pump head/cylinder away from
the eccentric box as the bolts are removed.
3. Remove the seal retainer nut from the pump head cylinder (refer to Figure 18).
4. Remove the four-socket head caps crews that retain the cylinder to the pump head (refer to
Figure 18) and remove the cylinder, taking care to not lose the copper gasket.
5. Select a socket or spacer which fits into the cylinder side bore of the pump head and also
clears the rear poppet of the HPV (refer to Figure 18).
6. Exert pressure on the socket or spacer to press the HPV out of the pump head.
7. If cleaning of the valve is required, use a suitable solvent and blow air through the valve to
remove all contaminants.
8. Inspect the o-rings on the body of the valve for nicks or other damage and replace if
required.
9. Lubricate the o-rings with PULSAlube 7H and carefully insert the HPV into the dish side
bore of the pump head. Rotate the valve so that the hole and slot farthest from the center
are aligned with the corresponding slot in the pump head. Using a socket or spacer which
clears the front poppet, press the valve into the pump head until it is fully seated.
Figure 18
10. Reinstall the cylinder, copper gasket, and seal retainer nut.
11. Inspect the o-ring on the pump head locating shoulder for nicks or other damage, replace if
necessary, and lubricate with PULSAlube 7H.
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