Abstract: A drive line (A) for testing a component (D) of a drive train of a vehicle comprises a torque sensor. The torque sensor measures AC variations in torque due to the operation of the component (D). The component (D) is coupled to the drive line by an adapter having a coupling for coupling the drive line to the axle. The torque sensor may output both AC and DC components of measured torque variation. A servo controller controls the drive line so that the drive line is driven into abutment with the axle and then backed off by a small preset distance.

Abstract: A trailer landing gear lifting apparatus (100) for raising and lowering landing gear (10) of a trailer (30) has a motor (136) fitted to a motor plate (134) which is affixed to a modified conventional gear housing cover (130) of a trailer landing gear assembly (10). The motor (136) has a motor gear (154) affixed to a motor shaft (156) by a roll pin (158). The motor gear (154) engages a drive low gear (142) of a generally conventional gear system (136). A spacer on a drive shaft 138 locks the gear system (136) such that the drive low gear (142) engages a driven low gear (146). A key switch (172) controls a pair of solenoids (170) to selectively provide power to the motor (136) for raising and lowering the legs (14) of the landing gear assembly (10).

Abstract: A trailer landing gear lifting apparatus (100) for raising and lowering landing gear (10) of a trailer (30) has a wrench (102) connected by an air hose (102, 222) to an air supply line ((212) and, optionally, to an air tank (210). An attachment bracket (104), a keeper arm (106) and a wrench bracket (110) optionally secure the wrench (102) to a pair of I beams (112) of the trailer (30) such that the wrench (102) is affixed to the trailer (30).