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So, I've a Joe Blow Sport and it's been all good for about 10 years or so, recently been having this issue in that every couple of cycles the pump handle will just fall with no resistance and it's won't pump any air. pull the handle back up and it'll pump a few more times and again fall and not pump air. Anyone had similar?
Are these floor pumps repairable, are they even dismantlable?
yep - you can dismantle them, the black collar lifts up and you can take handle / shaft out.
The hose assemble can be taken apart where it joins the pump base.
Not had that failure on mine yet, but have had it apart when I managed to get sealant back inside the pump when letting air out of the tyres
Totally serviceable & rebuildable, parts are easy to get.
https://www.extrauk.co.uk/product/list/Topeak/Pump_Spares/
Just had to replace the o-ring on mine - 50p from SJS Cycles + £3.50 postage
Good as new again.