Re: IH 6788 trans grinding

Posted by K.B.-826 on April 26, 2007 at 18:57:22 from (24.180.143.209):

In Reply to: IH 6788 trans grinding posted by Harvesterguy on April 26, 2007 at 15:44:05:

I've never worked on one of those, but if I remember right, the transmission brake was hydraulic applied and controled by a electric solenoid. The brake itself is probably very similar if not identical to the one used in the 3088 series two wheel drives. I know that the parts on those are very expensive compared to the style used on the 06-86 series, but are much more reliable. Keep in mind that the range transmission is a collar shift and it is impossible to shift without grinding unless the tractor is at a dead stop, the engine is at low idle, and the clutch has been disengaged for at least three seconds. If it still grinds once these conditions have been met, then you go looking for a trans brake problem. On the popping out of gear problem, thats a classic case of failed detent parts underneath the range trans cover. If these 2+2's are anything like the two wheel drive 86 and 88 series, it wouln't be a walk in the park to repair. Cab floor and seat need to be removed, unhook shift linkages, drain a few gallons of oil and remove the cover from the left side of the range trans, block the park lock assembley in the unlocked (up) position, remove the range trans cover while a helper works through the removed cover on the left side and catches the reverse shift fork and makes sure it's woodruff key does not get lost.

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