Posted by Hugh Mackay on May 06, 2008 at 08:52:50 from (209.226.247.100):
In Reply to: Re: hyd whine posted by Dan Sp on May 06, 2008 at 04:30:39:
Dan: The screen is on the suction side of the pump, and yes a restricted flow at the screen will cause a whine. It's also very hard on the pump as good oil flow lubricates the pump as well as creates hydraulic function. Very likely you've not hurt anything yet as you are getting enough oil circulation to give you hydraulic function.
Personally I'd drain it, plug on left at bottom near battery. The screen is that recessed circle held in by 4 1/4" bolts. Hopefully the screen has not collapsed. Clean it and fill the unit with fresh Hy tran. Remember when you fill it, have both roskshafts in rear position. Fill to the bottom of the fill hole. With fill plug out, tractor idleing, put the hydraulic levers full stroke 1/2 dozen times, returning to rear position. Check level again, it may be down as oil replaced air in the system. Do not overfill, and don't operate tractor any more than you have to until you do that hydraulic oil change.
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