Hydraulic joint play detector for trucks incl. galvanised foundation box. The electronic axle play tester is suitable for checking wear-related bearing play on chassis parts (axle stub bolts, bushings, ball joints, steering parts, etc.) for trucks. The test plates, which can be lowered into the workshop floor, allow the vehicle wheels to be moved directly on the vehicle in longitudinal and transverse direction to locate existing play, the 8 directions of movement are radio controlled via the control panel on the hand lamp, axle load 20t.