ARO 66300-R73 Lower Pump | Industrial Pump Service Replacement Part

ARO 66300-R73 Lower Pump

The ARO 66300-R73 Lower Pump is a replacement service component intended for Air Operated, Two-Ball Double Acting Pump. It is suited to maintenance, repair and overhaul work where the existing component is worn, damaged, missing or being replaced as part of a planned service procedure.

For purchasing and maintenance teams, the manufacturer part number 66300-R73 should be the primary identifier. ARO equipment can use visually similar parts across different models, sizes and generations, so the complete pump or equipment model should be checked against the applicable parts list before installation.

Product Identification and Application

This listing identifies the component as Lower Pump. The available application information associates it with Air Operated, Two-Ball Double Acting Pump. Use that application as a selection guide, but verify the exact model and parts-list position whenever the repair involves a model-specific assembly.

The available product row does not provide a verified material specification. Do not assume construction from appearance alone; confirm material from the applicable ARO parts manual when material compatibility is important.

• Part number: 66300-R73
• Component: Lower Pump
• Application: Air Operated, Two-Ball Double Acting Pump
• Part number: 66300-R73
• Brand: ARO

Maintenance and Replacement Guidance

Before removing the original part, isolate the equipment and follow the shutdown, depressurization, lockout and service instructions for the specific ARO model. During disassembly, note the orientation of the existing component and inspect the mating surfaces, fasteners, seals and nearby parts that may affect the repair.

Check the removed lower pump for wear, cracking, distortion, corrosion, thread damage, surface scoring, leakage marks or other signs of deterioration that are relevant to its function. If neighboring parts show similar wear, replacing a single component may not fully correct the underlying service condition.

The required assembly quantity is not clearly stated in the available row. Confirm the parts-list quantity for the exact equipment model before placing a maintenance order.

Why Model Verification Matters

ARO product families can share similar component names while using different materials, dimensions, threads, hardware sizes or assembly configurations. Selecting by appearance alone can lead to an incorrect order. Match 66300-R73 to the complete equipment model, current parts diagram and service section whenever possible.

For an accurate maintenance order, confirm the part number, full model, material when specified, required quantity, service location and whether the repair is being completed with an individual part or a larger service kit. This helps reduce duplicate purchases, installation delays and avoidable downtime.

Ordering ARO 66300-R73

When requesting a quote or placing an order, provide ARO 66300-R73 together with the complete pump or equipment model. If the machine has been rebuilt or modified, compare the existing assembly with the current parts documentation before purchase.

The goal is to match the documented replacement component to the actual service configuration. Using the exact part number and verified equipment information gives technicians and buyers a clearer, more reliable path to selecting the correct lower pump for the repair.