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We are haveing 3no's GE Frame -III machines which are equipped with NT 855C diesel engine & Twin Disk Model: 4-SG-1607-2 torque convertor. The jaw clutch is getting disengaged at TNH of 36% speed. Diesel engine complete servicing was done. Torque convertor pressure checked & found to be 4.0 kg/cm2. Alignment between torque convertor output shaft & GT input shaft checked & found to be with in 0.12 mm radially & 0.15 mm axially which are with in tolerable limits. Still the clutch is getting disengaged at this speed. If we force the clutch disengagement limit switch signal machine going to FSNL, but with a bit slow acceleration. How to sort out the problem?