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975 2½”-10”

975 2½”-10”. Modification Overview. Production of the 975 (21/2”-10”) began in 1990 and was discontinued in 2004. Check Cover Removal. Cover is o-ring sealed. Loosen bolts 1/2”. The spring load is now released from the cover and retained by the check subassembly.

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975 2½”-10”

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  1. 9752½”-10”

  2. Modification Overview • Production of the 975 (21/2”-10”) began in 1990 and was discontinued in 2004.

  3. Check Cover Removal • Cover is o-ring sealed. • Loosen bolts 1/2”. The spring load is now released from the cover and retained by the check subassembly. ** Verify spring load before removing all the bolts.

  4. Check Valve Removal • Center stem guided check assembly. • Disc & spring subassembly. • Slide subassembly straight out of seat and body.

  5. Check Seat Removal • Seats are bolted into the body and o-ring sealed. • Remove the bolts and pull the seat straight out of the body. • 4”-10” - Inspect plastic guide bushing in center of seat.

  6. Check Disc Replacement • Remove retaining nut and disc retainer.

  7. Check Valve Reassembly Notes • Reassemble checks in reverse order. • Lubricate o-rings.

  8. RV Cover Removal • Cover is sealed by the diaphragm. • There is no spring load on cover. • Remove bolts.

  9. RV Module Removal • Module is o-ring sealed. • Pull the module straight out of body.

  10. RV Seat Removal • 21/2”-6” RV seat is bolted into body and o-ring sealed. • Remove the allen screws and pull seat straight out of body. • 8”-10” RV seat is threaded and o-ring sealed.

  11. Disassemble RV Module • Module is spring loaded. • Holding the module firmly, remove the stem bolt.

  12. Disassemble RV Module • Remove the guide bushing from the stem.

  13. RV Disc Replacement • Remove retaining bolt, disc washer, and disc. • Reassemble in reverse order.

  14. RV Reassembly Notes • Bead on the edge of the diaphragm should face the disc end of the module. • Lubricate o-rings. • Push the module straight into the body. • Diaphragm bead will line up with the groove on the RV body. • Check the sensing line o-ring on the cover.

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