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1978 John Deere 8430 transmission problems

Rick Peters After starting and letting out on clutch there is a screaming noise in transmission. The tractor will move but the noise is worse in 2 & 4. The clutch pressure is low and the transmission light flickers. It also acts like it is slipping under a load and makes a loud whirring noise at the same time. Is the transmission shot? Is there a final drive pump? When it is warmed up, it doesn't want to steer or the hydraulics will not work. Does it cost more to rebuild than the tractor is worth?
Kendall It sounds like your 2 speed is slipping in high range. 1st and 3rd uses low and 2nd and 4th use high. This component is located just ahead of the hinge area and attached to the top shaft. It is removable through the hinge if tractor is hinged to the right. Hyd problem might be a plugged screen in transmission. (large plug ahead of LH axle housing lower trans case) Hope this helps.
Anthony Fels Yes - first thing to try is change transmission filter. Make sure the 'O' ring seal fits correctly - you may want to get a new 'o' ring with the filter. Transmission and hydraulics use the same oil - 100L to fill from empty. Drain plug is under the pto shaft and on rhs of tractor. Change the clutch filter at the same time - it is the same filter but located next to the articulation hinge.

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