Posted by MaxDamage on December 05, 2013 at 20:12:00 from (216.235.175.14):
I picked up a '57 560 Gas with Koyker loader one September a couple of years ago, did the standard change of fluids and the hydraulic oil had the color of wet cement. New Hi-Tran went in, the hydraulics worked great until it got much below freezing, then they were weak or nonexistent. The pump whines like it's cavitating when the hydraulics barely move. If it stops whining, nothing moves. Running for several hours finally had things moving a bit when it was above 15 degrees.
This fall I put in new Hi-Tran and filters, replaced all the O-rings including on the suction side of the pump, plus I let it sit for most of a week and drained off about half a quart of water from the drain plug that had settled.
The pump is doing the same thing this year. -6 tonight, she fired up and the 2-point raised nicely with an 8' wide blower on it, the loader was slow but moved. Within 10 minutes of pushing snow outside the 2-point won't move, the loader won't move, and I get barely a whine from the pump every now and again. Idle the motor down it will whine a little, rev it up and nothing.
Either I've an air leak somewhere on the suction side of the pump, or the pump is so worn it can't pull a vacuum when the oil is thick. The filter is a later-model oval one-piece unit, so that shouldn't be restricting flow. The pump is the factory unit, and develops enough pressure to lift a round bale on a bale fork when the oil is flowing. I was thinking of tapping the output side of the pump with a clear hose going back to the fill hole, just to see that there is flow and no air bubbles. Anything else I can check before I throw a $400 pump at this thing and hope that solves it?
If starving pumps are a known issue on this tractor I'm thinking replacing the factory 12gpm unit with a 16gpm unit is probably a recipe for disaster. Anybody know for sure?
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