When connecting the converter dolly to the rear of the first semitrailer, what must you verify about the pintle ring connection?

PINTLE HOOK AND RING CONNECTION is the coupling between the converter dolly's drawbar and the first semitrailer's rear pintle ring. A failure here separates the rear half of the combination at highway speed. VERIFICATION STEPS: PHYSICAL LATCH: The pintle hook must be fully closed around the pintle ring — the hook jaw wraps around the ring and the safety clasp locks it closed; pull on the connection with your hand to feel for looseness; SAFETY CLASP: The spring-loaded safety clasp must be in the fully secured position — it prevents the hook from bouncing open on rough roads; SHAKE TEST: Push and pull on the dolly drawbar with some force — there should be no separation at the pintle connection; SAFETY CHAINS: Federal regulations require safety chains or cables between the towed unit and the towing vehicle; chains must be crossed under the drawbar (forming an X) to cradle the drawbar if the pintle connection fails; chains must have adequate strength and appropriate length (enough for turns but not dragging); PINTLE RING CONDITION: Inspect the pintle ring itself for wear, cracking, or deformation — a worn ring may allow the hook to slip through under load. CONSEQUENCE OF FAILURE: A failed pintle connection releases the dolly and second trailer — both will have emergency brakes apply automatically (emergency line disconnects), but the separated units can still cause serious crashes in highway traffic.