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Breakaway torque is the rotating force required to break the head loose, going in the same direction as applied-tightening. This will usually give a value HIGHER than the original tightening torque because dynamic (when the bolt was tightened) is lower than static (when you try to break loose the bolt head). This is how it is defined by torque testing standards. If the breakaway is measured in reverse (loosening), you will usually get even higher readings because the bolt head generally digs in and forms small burrs and indents THAT ARE DIRECTIONAL-like a ratchet. It is incorrect to check breakaway by loosening.
BRAKING THROUGH RESISTANCE. Allisonâs hydraulic retarder is basically a vaned flywheel in the transmission housing. The transmission directs oil into the retarder housing to absorb the vehicleâs energy through the drive shaft. The absorbed energy is converted to heat and dissipated through the vehicleâs cooling system.he hydraulic retarder is a most simple device, and has only one moving part -- a rotor or paddle wheel.. The truck wheels turn the rotor through the transmission. The rotor throws the oil in the rotor cavity against the fixed stator vanes, which resist the oil flow.