JACK BOLTS J001
Some jack bolts are welded to the base plate, others (as shown) are available in a kit form for use on multiple pumps.
The term “jack bolts” is also used to describe some of the bolts located on the rear plate of most ANSI pumps. Please look a the following illustration:
The adjusting bolts shown on the left of this drawing are used to move the impeller towards and away from the volute or wet end. The jack bolts (positioned between these adjusting bolts) are used to pull the shaft and impeller back against the adjusting bolts to fix the impeller to volute clearance.