Waters Prep Series Installation And Maintenance Manual page 149

15. Insert the two hex-head screws.
16. Reconnect the plunger wash lines and, with a syringe, push solvent
through the two pump heads until it exits the second pump head. This
primes the plunger wash and lubricates the plunger before you run the
pump.
17. Start the pump, and set the flow rate to 3.0 mL/min. Pull out and release
the indicator rod. If it does not snap back, the head is misaligned. Loosen
the head and rotate it slightly for correct alignment.
18. Reconnect the solvent lines, and examine fittings for leaks.
Replacing the plunger wash seal
The wash seal is located in the head support assembly.
To replace the plunger wash seal:
1. Remove the pump head and head support assembly.
2. Remove the indicator rod from the head support assembly.
3. Push on the wash seal from the back of the head support assembly with
a small, blunt-end tool. The seal and retainer pop out the front of the
head support assembly. The front of the head support assembly is
imprinted with a number.
Installing a new wash seal and reassembling the pump head
Refer to the figure "Head support disassembly" on page 3-57
Tip:
procedure.
To install a new wash seal and reassemble the pump head:
1. Insert the seal insertion guide into the front of the head support
assembly.
The circular opening in the guide is tapered, with one side larger
Tip:
than the other. The larger side of the opening must face you.
for this
Maintenance procedures 3-65