Yes, the motor turns a spiral pinion geared to drive the gear wheel, bit like a differential. The gear wheel has a plastic or neoprene ring gear pressed onto the alluminium gear wheel, like the ring gear of a flywheel. The gearwheel operates a piston lever that operates the pump diaphram to pump the bilge. It is the plastic/neoprene ring gear that has broken and the ring gear is slipping around the gear wheel that operates the lever action for the diaphram. Hope that makes sense. I sent another email to Reya but have had no reply. Pity these French sites don't translate to English, especially when they manufacture to distribute world wide.