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Repair To 15-Speed Powershift Transmission On My
Deere 4960 Tractor
Reuben Swarey, Henry, Tenn. swareyfarms@emypeople.net: “The 15-speed powershift transmission on my Deere 4960 tractor slipped whenever I pulled a heavy implement down the road in high gear. The dealer thought the clutch was worn out so he replaced it at a cost of about $8,000. The tractor then ran okay for about 1 1/2
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Repair To 15-Speed Powershift Transmission On My Deere 4960 Tractor TRACTORS Maintenance 45 Reuben Swarey Henry Tenn swareyfarms@emypeople net: “The 15-speed powershift transmission on my Deere 4960 tractor slipped whenever I pulled a heavy implement down the road in high gear The dealer thought the clutch was worn out so he replaced it at a cost of about $8 000 The tractor then ran okay for about 1 1/2 years but then the transmission started slipping again The same problem happened on another one of my 60 Series tractors “Then a mechanic friend in Pennsylvania gave me some advice He said powershift transmissions have a hydraulic valve that releases power to the transmission When you push in the clutch the valve opens and when you release the clutch it goes against a small aluminum stop that closes the valve However over time the valve wears against the housing and oil leaks out which causes the clutch to lose pressure “He recommends using a 3 1/2-in hand grinder to grind about 3/8 in off the stop which will allow the valve to close farther and increase the clutch pressure I tried the idea on my 4960 and the transmission stopped slipping immediately ”
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