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806, 806YD 3”-10”

806, 806YD 3”-10”. Modification Overview. 806- (1979-1988) Cast Iron body- Threaded in seats- Internal check parts are epoxy coated iron. 806YD- (1988-present) Ductile iron body- Bolted in seats- Internal check parts are stainless steel.

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806, 806YD 3”-10”

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  1. 806, 806YD3”-10”

  2. Modification Overview • 806- (1979-1988) Cast Iron body- Threaded in seats- Internal check parts are epoxy coated iron. • 806YD- (1988-present) Ductile iron body- Bolted in seats- Internal check parts are stainless steel. • The 806/806YD currently use the ¾” 805YB as the bypass assembly.

  3. Check Cover Removal • Cover is o-ring sealed. • 3” cover is spring loaded. * Hold cover firmly while removing bolts. • 4-10” Loosen bolts ½”. Spring load is now released from the cover and retained by the check assembly. * Verify spring load before removing all the bolts.

  4. Check Valve Removal • Center stem guided check assembly. • 3” spring, stem, and disc holder are free once cover is removed. • 4-10” disc & spring subassembly. • Slide subassembly straight out of seat and body.

  5. Check Seat Removal • 806YD series seats are o-ring sealed and bolted into the body. • Remove bolts and pull seat straight out of body. • Inspect the plastic guide bushing in center of seat. • ** (806) series seats are threaded into the body.

  6. Check Disc Replacement • Unthread the nut from the stem and remove disc retainer. ** For model (806) spring tension may have to be released to replace disc. Consult service center.

  7. Check Valve Reassembly Notes • Reassemble in reverse order. • Apply lubricant to o-rings. • 3” Models- inspect and clean the plastic guide in the check cover.

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