Crosshead jam nut torque tool

An improved torque wrench for loosening or tightening jam nuts mounted on a compressor shaft, comprising:

• a) a torque wrench body;
• b) a moveable drive head mounted on a first end of the torque wrench body;
• c) a hydraulically powered cylinder mounted on the torque body and inter-connected between the torque body and the movable head for driving the drive head during loosening or tightening of the jam nut;
• d) a portion defining less than 50% of the drive head disengageable from the drive head for allowing the drive head to be engaged around the jam nut while the nut is mounted on the compressor shaft, and the disengageable portion reengaged onto the drive head for fully engaging around the jam nut during the loosening and tightening.

An improved torque wrench for loosening or tightening jam nuts mounted on a compressor shaft, comprising:

• a) a torque wrench body;
• b) a moveable substantially circular drive head mounted on a first end of the torque wrench body;
• c) a hydraulically powered cylinder mounted on the torque body and inter-connected between the torque body and the movable drive head for driving the drive head during loosening or tightening of the jam nut;
• d) a gated portion defining less than 180° of the substantially circular drive head disengageable from the drive head for moving to an open position to allow the drive head to be engaged around the jam nut while the nut is mounted on the compressor shaft, and when returned to a closed position, to be reengaged onto the drive head for fully engaging around the jam nut during the loosening and tightening.