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#1
09-02-2017, 08:31 PM
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HydroGear issue
Hey guys, I've got a 1863 (with BDU-21L hydrogear) with excessive hydro whine after a tear down to fix a leak. After the tear down/seal replacement, I buttoned the hydro pump back up, filled it 3/4 full and reinstalled it, drained trany fluid from differential, replaced the filter and refilled with Hytran (meets IH specs) which is what I had been using for the last couple of years. With the rear wheels raised, I ran it at medium throttle and in neutral and could immediately hear it whine, full throttle was worse. Shut it down, Loosened the bypass valve and foam type consistency came out...so figured there was air in the system. repeated a few times and it got better to a point where 3/4 throttle and 3/4 speed was ok with no load, but full throttle still produced the whine. Took it for a test drive and forward and reverse are fine on a flat to downhill, but slight incline produces much whine and below normal power. It worked fine prior to the tear down/seal replacement, what I would consider normal whine only during heavy load. The bypass value seems to be working fine. The two checkvalves also seem to be fine. Besides the obvious of what's wrong... how full should I fill the hydro pump before reinstalling?
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