Hi, Not all of the 328’s have removable oil tanks. I have included a link to a drawing of a non removable tank. A way to determine if your tank is non removable is by a welt at the seam between the tank and block...
If you are in need of a drawing. This is a link to it.
https://www.hcrcnow.com/uploads/drawings/lincoln_93657_series_l_hydraulic_service_jack_4_ton.pdf
You did great. That jack has been manufactured for many years and is still made. So all repair parts are widely available. Enjoy.
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If you have a walker or lincoln. This is a link to the 93666. There are a few series and they are listed at this link.
https://www.hcrcnow.com/search?s=93666
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This is a link to a partial list of Lincoln serial numbers
https://www.hcrcnow.com/uploads/drawings/walkerlincolnserialnumbersystem.pdf
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Denny, loaded ucups have a few styles. Loaded cups come with a quad ring or oring in the grove. These can just be taken out with anything that is not sharp. Just pry it out. These are pushed in the grove and can be removed very easily. No cutting or gouging.
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