The T 62 T2B was the original installed APU for the Chinook-T-62 2A1 is Skycrane. T 62s with the side mounted gen & Nose fitted Hyd pump were the norm with the T62 B2s as the Chinook was Hyd started.
The T-62-2A1 was a shaft to Assy section on the Sky Crane to drive all the Pumps & Gens mounted on the main gearbox.