Bosch Rexroth A6VM170HA1000001C/71MWV0R4A18W0-0 axial piston variable motor

A6VM170HA1000001C/71MWV0R4A18W0-0, manufacturer material number R902247290, is a Bosch Rexroth A6VM series 71 bent-axis variable-displacement hydraulic motor for open and closed hydrostatic circuits. The factory catalogue identifies this complete execution. Its control is automatic high-pressure-related.

The manufacturer’s RE91610 edition dated 29 January 2025 gives a standard base-motor geometric maximum of 171.8 cm³/rev and nominal working-port pressure 450 bar with mineral-oil hydraulic fluid. At full swivel (100% swivel angle and geometric maximum displacement), the 500 bar duty limit uses individual operating periods up to 10 seconds and a cumulative 300 hours; pressure up to 530 bar is permitted for a limited 50 hours within that duty period. The base-motor speed limits are 3100 rpm at maximum displacement and 4900 rpm only below 65 cm³/rev, with optimum viscosity 16–36 mm²/s and the stated inlet-flow and load conditions.

The actual supplied minimum displacement, control presets and suffix-specific geometry are not established by the catalogue identity. Use the binding installation drawing for exact shaft, flange, port and accessory details. These qualified series limits are not unconditional ratings for a complete customized assembly.

The manufacturer photograph is representative of the A6VM series and may show different control equipment from this execution.

The standard size 170 8W motor-plus-BVD25 counterbalance arrangement has separate catalogue limits of 350 bar nominal pressure, 420 bar maximum pressure and 320 L/min inlet flow. These lower assembly limits take precedence over the bare-motor reference. The counterbalance valve must be ordered and identified separately; the exact type and relief settings are not established by the motor material number alone. Controls beginning at minimum displacement, including standard HA, are not permissible for lifting-winch drives. The counterbalance valve does not replace mechanical service and holding brakes.