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Message: <blockquote data-quote="Chalmers" data-source="post: 112249" data-attributes="member: 15979"><p>I have searched here but found nothing so am asking for some guidance.Included below are some details that may help others. I have a Bobcat 2011 ,T320 with "High Flow". It has 3 (not5)couplers on the Block,the small one is the Case Drain. One or more of the couplers on the Block are leaking. I suspect the O ring inside the male nose .All the external O rings and packing look good. So I decided to replace either all the O rings or if N/A , all the cartridges. I have failed to find any O ring kits for the cartridges. Any sources ? Just take the old seals to "Hose Man" ? I dismantled the male cartridge from the "Faster"Block ,it is a 46mm body-so the old style. The parts offered online muddle 46mm and 48mm so be careful just eyeballing replacements ! The other gotcha is there are 2 very similar looking Faster Blocks for 46/48mm bodies. The newer one is 4BD4FH. The older one on my machine is 4bd4 FF. The problem is the markings on the cartridges are very shallow and illegible .You are trying to see the difference between FH and FF ! I eventually found all the cartridges for my ....FF Block but noticed they are only rated at 24 gpm.The High Flow machines run up to 37gpm. Maybe that is why my big hydraulic breaker is wimpy ? So my idea is to simply upgrade to a new 4BD4FH Block complete with all 3 cartridges. The price is the same as buying replacement cartridges. WIll it work ???? How do I get a 4BD4FH with the larger 3/4" i.d. cartridges. Anyone tried this ? Thanks for any suggestions.</p></blockquote><p></p>

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