I have two 2500 hydros, one a one b, the a has 6000 hrs and always been real Quiet, I just bought 2500B, only 900 hrs, and after it sits for 5 mins. the hyrdro startes to whine, it does not loose power, it just noisy, should I be concerned? Pete in wi.
Read my post # 6 here Also, if the charge pump is losing pressure the main pump will likely make noise.