Fluke 729 User Manual page 69

8. Inspect the springs for wear or loss of tension. They
should be approximately 3.8 mm (0.15 in) long in the
relaxed state. If they are shorter, the O-ring will not
seat properly. Replace if necessary.
9. Clean and inspect all parts and then reinstall the O-
ring and spring assemblies into the valve body.
10. Reinstall the retention caps and gently tighten the
cap.
11. Seal the output of the Product and pump up the unit
to at least 50 % of its rated pressure.
12. Release the pressure and repeat several times to
ensure that the O-rings seat properly.
The Product is now ready for use.
Automatic Pressure Calibrator
Figure 23. Pump Valve
Maintenance
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