123AL00909A

The 123AL00909A hydraulic pump belongs to the PVH and PVE Open-Circuit Piston Pumps series manufactured by Vickers for hydraulic automation duties in mobile and stationary equipment. It employs a variable displacement mechanism to supply only the flow demanded at any instant, and its displacement of 18 cm³ per revolution defines the theoretical output per shaft turn. A pressure-flow compensator with a bleed-down orifice monitors system pressure and adjusts the swashplate to hold the set pressure while limiting wasted energy. The pump is set for clockwise rotation so it aligns with right-hand prime movers and prevents reverse flow damage. An industrial valve plate limited to 1800 rpm establishes the maximum permissible drive speed to avoid cavitation and excessive wear. Design code A identifies the original engineering release, ensuring replacement parts will match dimensional tolerances.

The input torque is transmitted via a 13-tooth spline shaft that spreads load evenly and eliminates keyway backlash. A two-bolt SAE B flange provides the mounting interface, allowing direct attachment to standard pump pads without additional brackets. Both suction and pressure connections are side-ported to keep hoses within the machine envelope and simplify service access. The inlet port is a 1.25-inch SAE O-ring fitting that maintains a sealed low-pressure feed and reduces aeration risk, while the outlet port is a 3/4-inch SAE O-ring fitting sized to control discharge velocity and minimize pressure drop. All external ports conform to the SAE J514 tube standard so the pump connects easily to common hydraulic tubing and hose ends used in industrial circuits.