Posted by IH fan on April 06, 2014 at 15:36:38 from (174.70.169.139):
In Reply to: SMTA power steering posted by Aces on April 06, 2014 at 14:28:55:
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I don't know what the flow rate of the SMTA pump is, but unless it drops below 5 or 6gpm at idle, you should still have some left for the hydraulics. You should need 3 to 3.5 for the PS and you will still have some left. I have a Char-Lynn and PFDV on my 240U and I do lose my 3 point at an idle, but do not lose steering. However, I my guess is the SMTA pump is higher capacity than the 240 pump, so you should not lose your hydraulic system flow. I keep my rpms above about 1/3 throttle and I'm okay, it's just at or near idle, but the 240 pump is pretty small. If you were idled down and did not have the PFDV, you might very well lose your PS and that could be more dangerous than losing the rest of the hydraulics. My company made PFDVs for just this type of system. I am not aware of any tractors that used them, but I know of combines that did... you always wanted steering first, even when at idle. also, I would be worried about the steering locking up with pressure on the return line of the TG when you operate the remote hydraulics.... you would basically have 0 operating pressure if you had the same pressure on the inlet as the outlet of the TG while lifting something with the hydraulic system.
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