Gear Tension Relief Sequence

When the displacement cylinder pistons are in their upmost position, each motor has prevailing torque due to the force necessary to ensure each piston is held firmly at the top of its travel. This torque results in "gear tension," or force on each gear that makes motor pack separation difficult. To avoid injury, or damage to the gears, the Gear Tension Relief Sequence briefly reverses each motor to eliminate the prevailing torque. Always perform the Gear Tension Relief Sequence prior to removing the hydraulic modulator/master cylinder assembly or motor pack from the vehicle.

The "Gear Tension Relief Function" can be performed with the TECH 1 Scan tool.
^ Select Miscellaneous Test (F4) from the "Select Mode" menu, then select Gear Tension Relief (F5)




Each hydraulic modulator gear (large gears) should be able to be turned in one direction and then in the opposite direction when the motor pack is removed. If any gear will not move, replace the hydraulic modulator. Service and Repair