IH 300U Hydraulic Pump whine

faroutliving · Dec 5, 2016

Having no idea how old the hydraulic fluid was (system was functional and no whining), I replaced the hydraulic fluid with hytran (first mistake?). As soon as I started it back up, the pump had a whine to it. I lifted the rear cylinder and it came right up, but when I let up on the lever it made an awful chunk/grind noise. I turned it off and now it sits. Powered for less than a minute.

The reservoir oil was opaque. Looks like lots of tiny bubbles. My first guess it is the pump is sucking air/not fully primed, but second guess is the fluid is wrong? It was cold (about 35F). Sadly, it is only going to be colder these next few days and I was hoping to drag a round bale out with it today. Time this iron earned its keep

Thanks for any advice,
Deron

Janicholson · Dec 5, 2016

The screen in the reservoir may be plugged (some from the old oil, and possibly a lot from the new oil stirring up crud from the bottom of the reservoir.
The screen may now have collapsed, starving the pump. The other issue is air in the system that likely allowed the hitch to drop some. There is a
orifice and screen (tiny) in the regulator safety block between the rear most (hitch) control lever and the reservoir. This is the pilot valve that
unloads the pump when the levers are in neutral. It has a small hole that must be free of crud, and the screen must be tubular and clean. All these can
be affected by trash stirred up from the reservoir, and the solution is probably to pull the top off of the reservoir, and to take apart the regulator
valve to assess the pilot and screen. The top is pretty heavy! Jim.

IH 300U Hydraulic Pump whine

faroutliving

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Janicholson

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