ARO 637434 Air Section Kit

Unlike a fluid section kit, the ARO 637434 services the air section of the pump. That is the half that receives compressed air and switches it from one diaphragm chamber to the other to make each stroke. Our listing does not give materials or a contents list for this kit.

In a double diaphragm pump, the air valve and its seals control when air enters and leaves each side. If those seals leak or stick, the pump can stall, cycle erratically or waste air, even when the diaphragms and balls are in good shape.

When to Use This Kit

• The pump stalls mid-stroke or will not restart without a tap or air pulse.
• Air keeps blowing out of the exhaust while the pump is stopped under pressure.
• Stroke rate becomes irregular with no change in air supply or fluid load.

Fits These ARO Pumps

The model below lists this air section kit in its parts breakdown:

• ARO 666251-244-C Double Diaphragm Pump

Check the model number on the pump nameplate to confirm a match before ordering.