Our investigation of the returned support arm has been completed.The investigation showed no indications of low friction in the joints.According to the customer, they had tightened the support arm before returning it.The support arm was stretched out and bent several times without friction reduction or a self-lowering at the level of the joints.The support arm joints were dis-mounted to check the friction rings.The friction rings were not worn out or damaged.No fault could be confirmed from inspection of the friction rings or the joints themselves.According to the installation instructions for the support arm the support arm joints shall be adjusted if necessary.Our conclusion is there is no fault with the support arm, the cause for the reported incident was that the support arm joints were not tightened.(b)(4).
|