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975, 975XL ¾”-2”

975, 975XL ¾”-2”. Modification Overview. Production of the original 975 began in 1990. This version had buna -n check discs and did not have replaceable check seats. Discontinued in 1992. The 975A had bronze replaceable seats.

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975, 975XL ¾”-2”

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  1. 975, 975XL¾”-2”

  2. Modification Overview • Production of the original 975 began in 1990. This version had buna-n check discs and did not have replaceable check seats. Discontinued in 1992. • The 975A had bronze replaceable seats. • The 975XL (1993-Current) has plastic replaceable seats and silicone check discs. • A lead free version 975XL2 was introduced in 2010.

  3. Check Cover Removal • Cover is threaded into body and o-ring sealed. • Cover is spring loaded. • Loosen cover with wrench, then remove by hand while holding tightly against spring pressure.

  4. Check Valve Removal • Poppet style check valve. • The poppet and spring are free once the cover is removed.

  5. Check Seat Removal • Check seats are threaded into body and o-ring sealed. • A “special tool” is needed for removal.

  6. Check Disc Replacement • Remove screw and disc washer from poppet. • Reassemble in reverse order.

  7. Check Valve Reassembly Notes • Inspect and clean the guide bore on the cover. • The stem must move freely in the guide bore. • Reassemble in reverse order.

  8. RV Cover Removal • Cover is sealed by the diaphragm. • Cover has a slight spring load. • Hold cover firmly as the bolts are removed.

  9. RV Stem Removal • Gently pull on the diaphragm to remove the RV stem. • The spring should fall out when the stem is removed.

  10. RV Seat Removal • The seat is threaded into body and o-ring sealed. • A “special tool” is needed to remove the RV seat.

  11. RV Stem Disassembly • Remove the retaining screw. • Pull the disc retainer and stem apart.

  12. RV Rubber Replacement • The diaphragm and seat disc are free once the stem is disassembled. • Replace rubber in reverse order. • Lubricate plunger o-ring on stem.

  13. RV Reassembly Notes • Reassemble the stem in reverse order. • Position spring in body. • Make sure diaphragm does not cover hole for sensing line.

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