Re: 886 issues

Posted by Owen Aaland on October 18, 2011 at 19:02:55 from (216.47.32.147):

In Reply to: 886 issues posted by Farmerdoug on October 18, 2011 at 17:29:11:

You did not say that there was any problem with the steering other than the leak before the hand pump was replaced. If the steering was OK at idle most likely the MCV hydraulic system is OK.

Since the TA is out on the low side and the problem is related to engaging the clutch most likely the problem is a sticking TA dump valve. Even though the TA lever has not been shifting the TA what actually happens is that each time you push down on the clutch pedal to release the clutch the dump valve also releases both TA clutch packs . When properly adjusted the TA dump valve restores hydraulic pressure to the TA before the clutch begins to engage. If the low side of the TA was not out you would find that the tractor would start in the low side of the TA and when the dump valve closed it would shift up to the direct drive speed. With the low side slipping the tractor does not move until the dump valve closes. If you get the dump valve to work smoothly I think that problem will go away. If you cannot get the dump valve to close when the clutch is releasing you may be able to run the tractor without the linkage operating the valve. It is there to keep the transmission from locking up when the TA is in direct and clutch is released. With a good sprague in the low side the gears would bind if the tractor rolls backwards. In your case the sprague is so bad that it may never cause shifting problems even it the TA hydraulic clutches are not released.

The steering system on the 3588 has two cylinders, both larger than the one on the 886. For this reason the steering system in the 3588 uses hydraulic flow of 10 GPM for the steering versus the 886 which uses 5 GPM. The 3588 hand pump displaces about twice the amount of oil per revolution compared to the on for the 886. For that reason it will take about twice the effort to turn the steering wheel compared to the correct hand pump. Since you are limited by the 5 GPM for the speed of the steering so the tractor probably wont steer any faster, you just turn the wheel less revolutions to turn the wheels from stop to stop.

This post was edited by Owen Aaland at 16:06:48 10/19/11.

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