NP-107A

Pump and hydraulic motor function of NP-107A

In pump mode, the NP-107A generates working fluid flow under pressure for hydraulic system consumers. In motor mode, the unit receives pressurized fluid and converts it into torque at the output shaft. The working displacement is 56 cm³, and the nominal system pressure is 21 MPa / 210 kgf/cm². This makes the unit suitable for heavy-duty hydraulic circuits where compact size, high torque and high-pressure operation are required. Shaft rotation direction in pump mode is clockwise according to the supplied data.

NP-107A on An-124 and An-225 aircraft

The NP-107A is used in the hydraulic systems of heavy transport aircraft such as An-124 Ruslan and An-225 Mriya. In aviation use, it is associated with special equipment hydraulic circuits. One of its roles in hydraulic motor mode is to drive the cable-rope extension and retraction system used for special cargo or aircraft rope-handling equipment. Because these aircraft operate with large and heavy onboard systems, the hydraulic unit must provide stable torque and pressure under demanding load conditions.

Auxiliary scavenge pump function of NP-107A

The NP-107A includes an additional scavenge pump. This auxiliary pump provides circulation and removal of heated working fluid from the bodies of main hydraulic pumps through heat exchangers back to the hydraulic tank. Its approximate delivery is about 10 L/min according to the supplied description. This function helps protect the hydraulic system from overheating and supports stable fluid temperature. In practical maintenance, the scavenge section should be checked separately from the main pump-motor section.

Working fluid and temperature conditions for NP-107A

The NP-107A operates with aviation hydraulic fluid, typically AMG-10 in aircraft hydraulic systems where specified. The unit is designed for a wide temperature range from −60 to +125 °C. This is important for heavy aircraft that may operate in different climates and at high altitude. Fluid cleanliness, viscosity and temperature control directly affect the piston group, bearings, seals, regulator mechanism and auxiliary scavenge pump. Contaminated or overheated fluid can quickly reduce serviceability.

Industrial use of NP-107A

Outside aviation, the NP-107A is also used in industrial hydraulic systems because of its high pressure capability and robust design. It may be installed in hydraulic drives for forging presses, stamping machines, casting equipment, machine tools and volumetric hydraulic transmissions. In such applications, units are often taken from aircraft storage or surplus stock and adapted for industrial equipment. For non-aircraft use, connection dimensions, shaft rotation, working fluid, cooling and filtration must be checked carefully before installation.

Design and installation features of NP-107A

The NP-107A is a variable-displacement axial piston hydraulic machine with a regulated delivery mechanism. It has a drive shaft, hydraulic ports, drain connection and mounting surfaces for installation in the aircraft or industrial hydraulic system. The unit may include external fittings that affect overall installation dimensions. During inspection, attention should be paid to shaft condition, flange surfaces, port threads, seals, leakage, scavenge pump operation and any signs of overheating or contamination.

Supply and documentation for NP-107A

For supply or replacement, the full designation NP-107A / НП-107А should be used. It is also useful to specify whether the unit is required for aircraft use, industrial use, repair, overhaul or bench installation. Since the NP-107A can work both as a pump and as a hydraulic motor, the required operating mode, shaft rotation, hydraulic connection scheme and documentation must be confirmed before acceptance. Product passport, storage records and test documentation are recommended whenever the unit is intended for aviation installation.