623ANM

Hydraulic pressure generation by 623ANM

The main function of the 623ANM is to convert mechanical rotation from the aircraft engine or accessory gearbox into hydraulic fluid flow. As the drive shaft rotates, the gear pump section draws oil from the hydraulic tank and delivers it into the pressure line. The nominal operating pressure is typically in the 120–150 kgf/cm² range, depending on the aircraft operating mode. Short-time maximum pressure may reach 170 kgf/cm² for not more than one minute according to the supplied data.

Mechanical drive of the 623ANM pump

The 623ANM is mechanically driven through a splined shaft from the aircraft engine, gearbox or accessory drive unit. The specified direction of rotation is right-hand / clockwise when viewed from the drive side. This detail is important during replacement, because hydraulic pumps from the same series may differ by rotation direction, fittings or mounting arrangement. Before installation, the shaft splines, mounting flange, centering shoulder, seals and hydraulic line connections should be checked.

Gear pump design of 623ANM

The 623ANM uses a gear-type pumping mechanism. During operation, rotating gears capture hydraulic oil at the inlet side and move it toward the outlet side, creating pressure in the hydraulic line. This design is compact and suitable for aircraft hydraulic systems where a reliable mechanical pump is required. The pump is sensitive to fluid cleanliness, suction conditions and wear in the gear section. Poor filtration, air in the suction line or contaminated AMG-10 oil can reduce pressure and damage internal surfaces.

623ANM with aircraft hydraulic consumers

In onboard hydraulic systems, the 623ANM may supply pressure to flight-control actuators, steering and servo units, landing gear extension / retraction circuits, braking mechanisms and other hydraulic consumers. The exact list of connected units depends on the aircraft or helicopter hydraulic system layout. The pump works together with hydraulic tanks, filters, check valves, pressure control devices, accumulators and cockpit pressure monitoring instruments. Correct operation of the complete hydraulic circuit is just as important as the condition of the pump itself.

Working fluid and temperature range of 623ANM

The 623ANM works with AMG-10 aviation hydraulic oil. The supplied data reference AMG-10 according to GOST 6794-53. The hydraulic fluid temperature range is from −60 to +70 °C, with short-time operation up to +90 °C. Ambient operating temperature is from −60 to +60 °C. Since the pump works at high pressure, oil cleanliness and proper filtration are critical. Contamination, excessive viscosity at low temperature or overheating may increase wear and reduce delivery stability.

623ANM and related 623-series modifications

The 623ANM is part of the wider 623 hydraulic pump series. Related versions include 623, 623K, 623KL, 623KP, 623T1 and 623Ya. These modifications should not be considered automatically interchangeable without checking documentation. Differences may involve rotation direction, fittings, mounting flange, body layout, operating pressure or installation conditions. For procurement, the exact designation 623ANM / 623АНМ should be used together with aircraft type, required condition and documentation.

Supply and documentation for 623ANM

On the aviation spare parts market, 623ANM pumps are often supplied from storage stock, including reserve / zero-time storage condition depending on availability. For aircraft use, condition must be supported by passport, form, storage records or repair documentation where available. Before installation, the pump should be checked for pressure output, leakage, shaft rotation direction, drive spline condition, flange condition, port cleanliness, fitting compatibility and conformity with the aircraft hydraulic system documentation.