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12. Vacuum Pump Shaft Fluid Seal
The QSVB vacuum pump shaft fluid seal is a triple lip and seal wear ring design. Service of the shaft seal requires
replacement of the seal and seal wear ring. The shaft and wear ring rotate against the lips of the stationary seal.
Both the seal and the wear ring are maintenance items. The original seal is warranted for twelve (12) months.
To control any seal seepage QSVBs are equipped with an outboard dyna-lip seal and related scavenge line. The
scavenge line should be kept free of any debris.
Seal Removal
1.
Lock out and tag out the main power supply.
2.
Remove vacuum pump drive belts and pulley.
3.
Remove the faceplate on the basic vacuum pump.
4.
Remove seal wear ring using tool part number 129231. Note: Shaft seal replacement tool kit, part number
129216, can be purchased through your local Quincy Distributor.
5.
Remove the triple lip seal from the faceplate.
New Seal Installation
1.
Thoroughly clean seal bore and shaft with 120-150 grit emery cloth.
2.
Remove seal bore scavenge line fitting at bottom outside of seal cavity and clean.
3.
Align bearing retaining ring gap with oil supply hole at the 7:00 o’clock position.
4.
Preheat seal wear ring to 300°F. Apply thick coat of Loctite 290 to inner diameter of wear ring.
5.
Install wear ring on shaft. Allow wear ring to cool completely.
6.
Apply LOCTITE 290 to entire outer circumference of shaft seal.
7.
Do not remove seal from insertion tool. Slide seal and insertion tool over shaft and up against wear ring.
NOTE: Seal must have two lips facing inward and one lip facing outward.
8.
Install dyna-lip seal and pulley. Note: Do not block scavenge hole with dyna-lip seal.
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