Pump manufacturers strongly recommend that you do not send your pump through the X-ray scanner (the belt for hand luggage). This does not apply to the full-body (walk through) scanners which provide very low doses of radiation. This is allowed.
Pump failures do occur. In 9 years of pumping I have had two catastrophic failures (i.e. ones that resulted in no insulin delivery), including a motor error on a Medtronic pump. Also a couple of non-fatal errors that required pump replacement. Just back from vacation and my Animas Vibe died spectacularly on the flight home (NO DELIVERY - CALL SERVICE - RERMOVE BATTERY TO SILENCE ALARM) accompanied by wailing alarm plus vibration). The replacement that Animas sent out was faulty from the get-go and wouldn’t work at all).
I suspect the OPs motor failure was not the responsibility of TSA.
Joel