12. Make certain that the diagnostics seal at the top of the eccentric box flange and the HPV
feed port o-ring at the bottom of the flange are in place (refer to Figure 4).
13. Insert the pump head into the eccentric box using the locating pins as a guide.
14. Some compression of the piston return spring will be required in order to start the pump
head retaining bolts after which the bolts can be tightened to complete installation of the
head. Spring compression will be minimized with the eccentric in the retracted position and
the stroke setting at 100%.
15. Reinstall the diaphragm and reagent head.
16. Re-install the eccentric box drain plug and fill with PULSAlube 7H hydraulic oil.
17. Re-prime the pump.
7.4.4 HPV Removal and Replacement - C & D Pump head Style
Use the following procedure for a HPV Removal and Replacement (C & D Pump head Style)
1. Remove the reagent head and diaphragm.
2. Drain hydraulic fluid from the eccentric box.
3. Remove the four bolts on the front eccentric box flange which retain the pump head. the
piston return spring is under compression and should force the pump head/cylinder away
from the eccentric box as the bolts are removed. If the cylinder separates from the pump
head, remaining in the eccentric box, it may be necessary to remove the eccentric box cover
and tap out the cylinder from behind.
4. The cylinder is retained to the pump head by two roll pins. Separate the cylinder by prying
on the groove above the o-ring (refer to Figure 19).
5. Using a hex wrench, unscrew the HPV from the cylinder side of the pump head.
6. If cleaning of the valve is required, use a solvent compatible with nitrile seals and blow air
through the valve to remove all contaminants.
7. Lubricate the o-rings with PULSAlube 7H and carefully insert the HPV into the back of the
pump head, make certain that the threads are properly engaged before tightening. Align the
roll pins to the appropriate holes and press the cylinder onto the pump head, make certain
that the o-ring on the back side of the pump head is in place
8. Inspect the o-ring on the cylinder locating shoulder for nicks or other damage and replace if
necessary, lubricate with PULSAlube 7H.
Figure 19
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