Checked a D6N S/N AKM7** After it is warmed up and priority valve starts switching, it stops hard in first gear. Checked transmission solenoid pressure, they are not sticking. It does it when priority valve switches to low pressure, but second and third are fine. Clutch pressure on first gear clutch is good until it is decelerated and the pressure drops to about 130psi. Then when you switch low idle and priority valve switches pressure comes back up.
Cat D6N harsh stopping in first gear
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