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Tech & Fab
PSC Steering woes - CBR pump blowing front seal
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<blockquote data-quote="slravenel" data-source="post: 693933" data-attributes="member: 1068"><p>Little background - Setup worked fine for ~8 rides since buggy was done without any steering issues.</p><p></p><p>CBR pump, 6" pulley -8 pressure</p><p>Double ended ram -6 pressure lines</p><p>Remote reservoir -12 feed (and vented 3 sides and down with standard clear poly hose)</p><p>21" heatsink cooler -8 feed lines, 3/8 NPT inlet and outlet of cooler</p><p>Older orbital (not sure brand, came from a pretty old PSC kit) pics below if anyone knows what this is. I cant remember for the life of me, but I talked to Lance @ PSC before he left and he told me that it was a good load sensing orbital that they used to offer and to keep it as it was better than their current options.</p><p></p><p><img src="https://i.imgur.com/4CGDObQ.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://i.imgur.com/drojYE4.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p></p><p>Anyway, this weekend the pump decided to blow out the front seal...it didnt blow it out in a sense that 100% of the fluid came out, but it stopped steering on anything other than flat ground while moving. If you rev it up and turn, the fluid will spray out the front seal. Sitting there, or just idling there and it wont spray out.</p><p></p><p>I thought it was just a pressure spike from hitting a rock too hard or something...so we went and got a T Bird pump from the parts store (same physical shape and bolt pattern as the CBR), made fittings work, got it bolted all back together as a trail fix..drove it around for about 15 mins and did some light trails behind the shop to test it out...blew the front seal out of that pump too. Same kind of symptoms....wouldnt come out unless revved up and turning; would semi work on flat ground while moving, etc.</p><p></p><p>Said **** it and left it in the yard where I could back the trailer up to it the next day. Next morning, cranked it up to pull it on the trailer and the sumbitch would steer just fine. Now I know better and know that it will still most certainly blow fluid out the seal if I let it get hot again...but why would it blow out both front seals like that? </p><p></p><p>I can attest the 2nd pump to being 1) potentially a bad parts store rebuilt pump 2) potentially cavitating and burning itself up (but then also why would the front seal leak if that was the case there)</p><p></p><p>So my question is:</p><p></p><p>I assume this is a pressure issue somewhere - Orbital potentially? Line blockage? Coincidence that both pumps blew out the same way? Has anyone else fought an issue like this and have any ideas where to start chasing it down? I would like to not just throw money at pump rebuilds until I can figure out the issue... Could something as small as a kink in the vent line cause that much pressure build up (i cant imagine that it could...I would think it would blow that hose apart WAY before it blew the seal out of the pump)</p></blockquote><p></p>
[QUOTE="slravenel, post: 693933, member: 1068"] Little background - Setup worked fine for ~8 rides since buggy was done without any steering issues. CBR pump, 6" pulley -8 pressure Double ended ram -6 pressure lines Remote reservoir -12 feed (and vented 3 sides and down with standard clear poly hose) 21" heatsink cooler -8 feed lines, 3/8 NPT inlet and outlet of cooler Older orbital (not sure brand, came from a pretty old PSC kit) pics below if anyone knows what this is. I cant remember for the life of me, but I talked to Lance @ PSC before he left and he told me that it was a good load sensing orbital that they used to offer and to keep it as it was better than their current options. [IMG]https://i.imgur.com/4CGDObQ.jpg[/IMG] [IMG]https://i.imgur.com/drojYE4.jpg[/IMG] Anyway, this weekend the pump decided to blow out the front seal...it didnt blow it out in a sense that 100% of the fluid came out, but it stopped steering on anything other than flat ground while moving. If you rev it up and turn, the fluid will spray out the front seal. Sitting there, or just idling there and it wont spray out. I thought it was just a pressure spike from hitting a rock too hard or something...so we went and got a T Bird pump from the parts store (same physical shape and bolt pattern as the CBR), made fittings work, got it bolted all back together as a trail fix..drove it around for about 15 mins and did some light trails behind the shop to test it out...blew the front seal out of that pump too. Same kind of symptoms....wouldnt come out unless revved up and turning; would semi work on flat ground while moving, etc. Said **** it and left it in the yard where I could back the trailer up to it the next day. Next morning, cranked it up to pull it on the trailer and the sumbitch would steer just fine. Now I know better and know that it will still most certainly blow fluid out the seal if I let it get hot again...but why would it blow out both front seals like that? I can attest the 2nd pump to being 1) potentially a bad parts store rebuilt pump 2) potentially cavitating and burning itself up (but then also why would the front seal leak if that was the case there) So my question is: I assume this is a pressure issue somewhere - Orbital potentially? Line blockage? Coincidence that both pumps blew out the same way? Has anyone else fought an issue like this and have any ideas where to start chasing it down? I would like to not just throw money at pump rebuilds until I can figure out the issue... Could something as small as a kink in the vent line cause that much pressure build up (i cant imagine that it could...I would think it would blow that hose apart WAY before it blew the seal out of the pump) [/QUOTE]
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