As far as installing the o-ring and backup ring, it depends on which style you got. With a round-profile o-ring and spiral back-up ring, install the o-ring first, then start one end of the spiral ring and work it in from there. If you have a square-cut o-ring and solid back-up ring, install the back-up ring first, as it isn't really flexible enough to get in after the o-ring. John Deere style usually has the first type, ISO/Pioneer style may use either one. In either case, the back-up ring is to the outside of the o-ring.
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