5•Service
Doc. 031851-05 12/04 5-15
5.7 Replacing a Pump Piston
Continued leaking from around the pump head after replacing the piston seal
indicates a scratched or broken piston.
1. Turn off the power switch on the ICS-90 rear panel and disconnect the power
cord.
2. Open the ICS-90 front door.
3. Disconnect the tube fittings from the inlet and outlet check valves (see
Figure 5-4
).
4. While holding the head firmly against the pump housing to compensate for
the spring loading, remove the two nuts (see Figure 5-6
).
5. Slowly release the head and allow it to separate from the housing.
CAREFULLY disengage the head from the sapphire piston by pulling the
head straight off and away from the mounting guides (see Figure 5-5
). Be
especially careful not to snap the piston if the spring is stuck to the piston
guide.
6. Remove the piston guide, spring, spring guide, spring retainer, and piston by
pulling them straight out, away from the pump housing (see Figure 5-7
).
7. If the piston is broken, replace the piston seal and the back-up seal (see
Section 5.6
). This will prevent pieces of broken piston from scratching the
new piston assembly.
8. Remove the retainer ring (P/N 035010) from the old piston assembly and
install it on the new piston assembly (P/N 036904).
Lateral motion when disengaging the head from the piston can break
the piston.
Un mouvement latéral pendant la séparation de la tête et du piston
peut casser le piston.
Vermeiden Sie Seitwärtsbewegungen, wenn Sie den Kopf vom Kolben
lösen. Andernfalls kann der Kolben brechen.
To Next Page
Loading...
