This manual contains overhaul instructions for the Hydraulic Transfer Unit,
The hydraulic transfer unit supplies an auxiliary hydraulic pressure source to the aircraft stability augmentation and flight control system in the event the pressure from the primary source falls below acceptable limits.
The hydraulic transfer unit is a constant displacement, one-directional device that transfers fluid power. The power transfer unit has two separate constant displacement hydraulic units connected by a drive shaft. The motor side is slightly larger in displacement than the pump side
Power transfer unit /Hydraulic Transfer Unit-PTU-HTU-动力转换部件维修手册-