Posted by Owen Aaland on June 28, 2010 at 00:51:47 from (65.165.246.5):
In Reply to: 1586 steering pump posted by Moline_guy on June 27, 2010 at 17:17:30:
Actually there will be no or very little oil flow to the rear in any of those tractors at low idle. You have a 12 GPM pump at rated speed, 2400 - 2600 RPM. When you drop to low idle at around 800 RPM you are running only 1/3 the rated speed. As a result the pump is also only going to flow 1/3 as much. That gets it down to about 4 GPM, less than the orifice will flow so all the oil goes to the steering. This really is not a problem since the tractor is not able to put much stress on the drive train at low idle.
The reason for testing at low idle is because by turning the steering all the way to stop in either direction it causes the oil pressure in the system to rise from about 250 PSI to 1800 - 2100 PSI. A weak pump will not flow enough oil at those pressures at idle and as a result the TA lube light will come on, the TA will down shift, or you will notice loss of braking assist. If the pump passes at idle it will be serviceable at higher RPMs.
The problem you have is air getting into the suction side of the system, most likely the seal ring between the center section and the rear frame. The MCV pump is completely submerged so the air is not entering there. Installing a new pump may help because it will be a little better at moving the air out of the system but it will not repair the main cause of the problem. On your tractor with the supercharge line it may help if you do not move either the hitch or the auxiliary valve until it has purged.
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