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I have two 4-ton Walker floor jacks, one a 784 and the other an 884. Externally, they look identical. Does anyone know over what years they were originally manufactured?

For anyone wondering, I figured it out. My jack has a piston pump from a Walker/Hein Warner 93657. It has a newer style snap on cup that still works in the Walker 884. This is the part https://www.hcrcnow.com/shop/parts/product/21180. It's a rubber o-ring that fits inside of a cup that snaps...

You are correct, the hard plastic washer heel plate goes on the end of the rod first, then the pump cup, and I agree the bits of black plastic are the center/retainer. Thanks, I'll give them a try.

I am overhauling a Walker 884 Series C floor jack. The power pump on mine is different from what is shown on the 884 drawing on the diagram on the HCRC website (attached). See attached pictures. There was a plastic washer and a rubber o-ring that were in the bottom of the power pump bore in...