I took the hydraulic head apart but I think a small part that goes between the retainer and the check valve in the center of the head is missing. I have the retainer that screws into the top of the head, the check valve needle and seat assembly and the spring that holds the needle down, but there must be a sleeve or something that holds the seat in place. When I tapped the plunger out the only parts that I found on the bench were the needle and seat and a brass ring that is beveled on the inside edges. Would someone have an exploded view of the hydraulic head on the PSB Injection pump they could share so I know what I'm looking for. Thanks, Dave
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