5•Service
Doc. 031851-05 12/04 5-11
8. Reinstall the check valves in the pump head. Be sure to install the inlet check
valve (which a 1/4-28 port) on the bottom of the head and the outlet check
valve (which has a 10-32 port) on the top. Tighten only enough to seat.
9. Reconnect the liquid lines. Close the front door.
10. Reconnect the power cord, and turn on the power switch on the ICS-90.
11. Prime the pump (see Section B.13
). If the pump will not prime, and you have
eliminated all other possible causes of the problem, replace both check valves
(inlet check valve, P/N 047660; outlet check valve, P/N 047661).
Figure 5-4. Pump Head Assembly
Overtightening may damage the pump head or the check valve
housing and crush the check valve seats.
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