Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Unfortunately, Campbell Hausfeld doesn't offer parts to repair or replace the piston on this model. The only thing that is offered is a complete new motor and pump assembly which has a cost of around $285.00 and is part number WL371500AJ. I have included a parts diagram of your machine with this comment so that you can see what I am looking at. I hope that this information is helpful to you.
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The majority of those machines do not have a bearing, it is a machined rod running on the machined crank surface.