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| 887 Challenger Series
www.natvac.com | 800.253.5500
Ballast Valve Rebuilding _______________________________________
If, from the troubleshooting guide shown previously, a ballast valve is
determined to require rebuild, a rebuilding kit can be obtained from
NVE. This kit will include all the components necessary to rebuild the
ballast valve. The ballast valves have been designed to be field rebuild-
able. The procedure is shown below:
1. Remove the ballast valve vacuum line from the ballast valve
cover (1/2” Wrench).
2. Remove the six socket head bolts from the ballast valve
cover.
Caution: The cover will be under slight spring tension
3. Remove cover carefully (spring should stay in cover).
4. Remove plunger assembly from ballast valve.
5. Remove nut from plunger assembly and disassemble.
6. Replace ballast valve diaphragm and the ballast valve
protective gasket and reassemble plunger assembly.
7. Place a small amount of Loctite on threads and an mating
face of nut and tighten.
8. Ensure plunger sealing face and internal housing sealing
face are free of burrs.
9. Insert plunger assembly back into ballast valve housing.
10. Place spring in the cover pilot, align JIC fitting downward and
close to the pump, and replace cover.
Note: Spring tension will have to be overcome to start bolts
Important: The shorter bolt goes in the 6 o’clock position
11. Tighten bolts evenly.
12. Remove and replace the boss plug in the ballast valve cover.