ARO 637128-F44-B Lower Pump End Kit for Piston Pumps

The ARO 637128-F44-B services the lower pump end, the fluid section of an ARO piston pump where packings seal around the moving rod. Per the product notes, the kit includes:

• V-packing and W-packing
• U-cup package
• Wiper
• Gasket and snap ring
• Cotter pin

Packings stop fluid from escaping along the rod, and the wiper clears material off the rod before it travels back through the seals. Replacing the packings, U-cups and wiper in one job avoids pairing fresh seals with aged ones on the same rod.

Symptoms That Call for This Kit

• Fluid weeps past the rod at the packing area or builds up on the wiper.
• Output pressure drops even though the air motor cycles normally.
• The pump creeps or keeps cycling with the outlet closed.

ARO Piston Pumps Listed for This Kit

Two AF0813 models and three AF1020 models carry this kit:

• ARO AF0813S11GF44
• ARO AF0813S11HF44-1
• ARO AF1020S11PF14-1
• ARO AF1020S11FF44-1
• ARO AF1020S11HF44