Hydro-Gear PW-4ADD-MY1X-X1XX 21cc Hydraulic Pump

Controlled hydraulic flow starts with the correct pump configuration. The Hydro-Gear PW-4ADD-MY1X-X1XX is a PW-series variable-displacement pump, supplier-listed as a 21 cc configuration associated with the BDP-21L platform.

A pump must match more than nominal displacement. Rotation, shaft, control, ports, mounting, and the complete build code determine whether it belongs in the system.

Why This Matters

An incorrect pump can create reversed or erratic operation, overheating, weak performance, or damage elsewhere in the hydraulic circuit. Exact identification and a clean, correct startup are essential.

Product Details

Additional Supplier Reference

106-9591 is retained as an identification/search aid only. Confirm interchangeability before ordering.

Installation & Service Notes

• Verify rotation using the manufacturer’s stated viewing convention, plus shaft, controls, ports, and mounting.
• Keep ports and hoses clean; correct the original failure cause and flush contaminated systems as required.
• Follow the equipment manufacturer’s fluid, filtration, control setup, and purge procedure.
• No equipment-specific installation PDF has been verified for this exact build.

Before You Order

Match the complete part/build code and verify the original component, equipment model and serial number, plus all relevant shaft, axle, control, port, brake, rotation, mounting, and revision details. A partial code or similar appearance is not enough to confirm fitment.

Lead Time, Returns & Warranty

• Many HydroDrives-supplied products are built to order and may require approximately 10–15 business days before shipment.
• Orders may ship from a U.S. partner warehouse, subject to confirmation.
• Approved returns may be subject to a 20% restocking fee; shipping is nonrefundable.
• Build-to-order, installed, used, damaged, or fluid-filled products may be nonreturnable.
• Warranty coverage may require authorized-service-center installation. Retain service records.