This tutorial will guide you through the process of servicing your ARO 66300-XXX 2-Ball style Piston Pump lower pump end.

Item numbers referenced in this tutorial correspond with the item numbers in the lower pump operator's manual.

• Service kit needed for these lower pumps ends include:

637305-X43 for general repair of 66300-XXX lower pump ends.

NOTE: The “X” is a generic character. Please see the complete pump model number and operator’s manual to identify the proper service/repair kit.

Some part materials and appearance will vary depending on lower pump model number.

NOTE: All threads are right hand.

For technical support: arotechsupport@irco.com | 800-495-0276.