MacGen PTO gearbox 540rpm to 1500rpm

Gearbox from 40 KVA MacGen PTO driven generator / alternator. 6 spline 540 rpm shaft connects to the tractor via PTO shaft. The gearbox increases the rpm to 1500 to suit 50Hz 4-pole alternators. Gearbox is designed to take a 44.5mm (1 & 3/4 inch) male keywayed shaft from your alternator. The key is 9.5mm wide x 8mm high. Only 6 hours on it. It was used as milking parlour back up. Only turned on twice in 5 years when power was gone. I connected the alternator directly to 1500 rpm engine, so I don't need the gearbox. (MacGen Alternator not included, not for sale) (PTO not included )