420 Water Pump Questions
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    420 Water Pump Questions

    The water pump on my 1956 420 tractor has failed. I was embarrassed by how much play had developed in the bearing, but in my defense, it made no sign it was going until yesterday. The ball bearings disintegrated. I pulled it apart today to see if it was in good enough shape to be rebuilt, and I noticed that the impeller vanes and the interior surface of the pump are tapered. If I put a straightedge across the surface of the housing, the diameter at the opening would not be even close to flush with the straightedge. I suspect that this might have been caused by the play in the bearing that allowed the shaft to rock, but I have no idea if that's the case, or if it's supposed to be that way. Based on the area that shows contact by the impeller, it looks like it may have been made that way, as it seems too even to have been caused by wear. If it's wear, then I'll need to replace the pump because there would be no easy fix to the housing.

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    Could anyone who has rebuilt one of these tell me if these pumps are made with this taper? Does anyone have any experience with the aftermarket (I expect Chinese) water pumps for these, in case I need one?

    Thanks,

    Stephen Barner
    Bolton, Vermont

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    Brownie919's Avatar
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    I would just go A&I aftermarket through your local Deere dealer. Its about $250 with a 1 year warranty.
    You can get the same thing on EBay from the same manufacturer a little cheaper but if theres an issue you don't have the support.
    2001 4300 SyncReverser 430 Loader/48 Backhoe
    Walker MC20 Zero Turn

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