Reason:.

(1) Body suspension is not in the middle position.

(2) Mounting bolts for jig, sample and horizontal table are not all tightened.

(iii) The body is locked.

(iv) Mechanical failure of the shaker.

Solution.

①Adjust the body suspension to the middle position.

②Tighten all bolts.

(3) If body lock is not required, release it.

　If body lock is required, review the test or review the testing machine.

(iv) Repair is required.