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My 4300 Sync Reverse tractor runs at varying speeds going forward, with or with-out a load. I can be dragging a box-blade of dirt and my speed goes anywhere from normal speed to barely moving and back again with no real change in engine speed. Engine does not bog down. Everything is normal in reverse.

4300 runs slow in forward OK in reverse
John Deere Tractors
Replies 2 Post by angmach

Well, I thought I had it fixed. ran about 4-5 hours over 2 days with no problems. Then today I hopped on, started up, warmed up, put it in gear and it dies. Went back to checking volts on the repaired wire, relay, and diode box connectors and jumping different connectors. I came up with a weak diode. Only flows about 10 volts. I always thought a diode was all or nothing. But when I jump it direct, everything is fine.

JD 4300 dies when shifting forward or reverse
John Deere Tractors
Replies 8 Post by angmach