Maintaining the 1525 Pump 73
4
4. Use the 1/2-inch adjustable wrench to loosen the outlet check valve housing.
5. While holding the pump head in place, use the 5/32-inch Allen wrench to remove the
two pump head assembly mounting screws. Loosen the screws 1/2-turn at a time for
the first two turns.
6. Carefully slide the pump head assembly off the pump. (See the procedure on
page 65
.)
7. Hold the pump head upside-down in one hand with the outlet check valve housing
facing the floor. Remove the entire outlet check valve housing and replace it with a
new one.
8. Finger-tighten the new outlet check valve housing into the pump head.
9. Turn the pump head over and carefully slide the pump head over the plunger and
onto the pump.
10. Holding the pump head securely against the pump, reinstall the two screws.
Alternately tighten the screws to secure the pump head to the pump. Do not
overtighten.
11. Tighten the outlet check valve housing with the 1/2-inch adjustable wrench.
12. Reinstall the outlet tubing assembly. Tighten the compression screw with the
5/16-inch open-end wrench while holding the housing with the 1/2-inch adjustable
wrench.
13. Reinstall the inlet tubing assembly. Tighten the compression screw with the
5/16-inch open-end wrench while holding the housing with the 1/2-inch adjustable
wrench.
14. Prime the pump as described in Section 3.2.1
. Check for leaks.
4.7 Replacing a Draw-Off Valve
Replace a draw-off valve if you notice that the valve leaks even after you tighten the knob.
Required Materials
• 5/16-inch open-end wrench (in Startup Kit)
STO
Attention:
Pull the pump head off straight to avoid breaking the plunger.
STO
Attention:
Ensure that the pump head is straight and the indicator rod is
properly aligned with the pump head to avoid damaging the plunger.
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