When called out to check weak steering on loader I discovered that smaller of tandem hyd pump (ultra) was under constant pressure of 90 bar; on further investigation I flow tested both pumps and both were only 60% of full flow when loadedto 200 bar; however I dont want to fit new pump while small one is under constant pressure. I checked pressure when cold and it was normal (ie charging brake and servo system every ten seconds or so- JCB engineer saids this was normal)) however it reverted to constant pressure when system warmed up (5mins). I blanked off supplies to brake and servo systems and pump was under normal predssure (10 bar), however the guage (which I had fitted between pump and charge valve) flicked up to appprox 30 bar every 7/8 seconds, has anyone come across this prob before; any suggestions what to do next?
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