Well servicing pump system with driveline assembly for hydraulic fracturing system

A well-servicing pump system, comprising:

• a first pump;
• a motor;
• an actuator;
• and
• a driveline assembly configured to selectively transfer rotary drive motion from the motor to the first pump, wherein the driveline assembly comprises:
• a flange shaft;
• a stub shaft;
• and
• a coupling assembly actuatable by the actuator to selectively decouple the stub shaft and the flange shaft, wherein the coupling assembly comprises:
• a drive-transfer cylinder movable between a drivingly-engaged position and a drivingly-disengaged position, wherein the drive-transfer cylinder transfers the rotary drive motion from the stub shaft to the flange shaft when the drive-transfer cylinder is in the drivingly-engaged position, and wherein the drive-transfer cylinder permits relative rotation between the stub shaft and the flange shaft when the drive-transfer cylinder is in the drivingly-disengaged position;
• a locking sleeve movable between an unlocked position to permit movement of the drive-transfer cylinder between the drivingly-engaged position and the drivingly-disengaged position and a locked position to prevent the movement of the drive-transfer cylinder between the drivingly-engaged position and the drivingly-disengaged position;
• and
• a ball-and-detent locking system configured to lock the coupling assembly relative to the flange shaft and the stub shaft in the drivingly-engaged position and the drivingly-disengaged position, wherein the ball-and-detent locking system comprises:
• a first detent defined in the stub shaft;
• a second detent defined in the flange shaft;
• and
• a ball configured to be received within the first detent when the drive-transfer cylinder is in the drivingly-disengaged position, and received within the second detent when the drive-transfer cylinder is in the drivingly-engaged position.