Categories: Shaft Alignment

Getting Pushy–Jacking Bolts Revisited


By on December 29, 2011

Jacking bolts provide a smoother, easier way of moving machinery than using pry bars and hammers. Their use will almost always speed up the alignment process, prevent excessive minor moves back and forth, and generally make the task of shaft alignment much more pleasant. More and more companies are realizing the benefits of using jacking bolts to accurately position machines.

What about you?

Jacking bolts can be purchased, or made in-house. Here are a few examples of some pusher types:

Pusher-Jacking-Bolt-300x204.jpgA C-clamp Weld a nut or tapped block to the side of the C-clamp. The clamp can then be mounted to the frame of the machine. The can be made in many different configurations, and can be removed after the shaft alignment is completed.

Dowel-Jacking-Bolt-300x156.jpgA dowel type The base can be drilled to accept a piece of rod, which has been drilled and tapped to accept a bolt. This can also be removed after the shaft alignment is completed, or left in place.

Channel-Jacking-Bolt-300x176.jpgA channel Drill and tap a piece of channel of the machine frame, and use a bolt or threaded rod to move the motor.

We know you’re a smart bunch – because you visit our blog! We’d love to hear how you have resolved the jacking bolt problem.

About the Author

Stan Riddle joined VibrAlign in 2008. He has over 35 years experience in aligning industrial machinery. Stan received his AAS Degree in Machinist Technology from Surry Community College in Dobson, NC, and also holds a diploma in Industrial Systems Technology from Forsyth Technical Community College in Winston-Salem, NC, where he was also an instructor in the program.

Stan began his maintenance career working as a machinist and millwright for companies such as Weyerhaeuser, R.J. Reynolds, and Tyco Electronics. He also has over 25 years experience in Predictive Technologies, such as vibration analysis, thermography, oil analysis, and ultrasonic inspection. He is a certified Level III Vibration Analyst with the Vibration Institute, and is a Past Chairman and Board Member of the Piedmont Chapter.

Stan and his wife live in Yadkinville, NC.

4 responses to “Getting Pushy–Jacking Bolts Revisited”

  1. hamidreza says:

    Noting the distance away from the motor footings,this gives a reference down the road during inspection to see weather the motor has move or not.
    We are using A dowel type.A C clamp is very good in case the motor has no jacking bolts.But i think because of base plate stracture shape this can not be used everywhere.

  2. jamil says:


    I will not give a comment for this, because i have question regarding the jacking bolt. i have big motor but there is no jacking bolt for align the motor to compressor.

    how i can provide the jacking bolt that the motor base is not metal but epoxy concrete
    so i cant provide the jacking bolt by weld or bolting to base.

    any people have an idea for design


  3. Stan Riddle says:

    Jamil, is it possible to machine a jacking bolt which could be set into the epoxy grout? I will send you a sketch of something I have done in the past regarding this.

  4. Bill Case says:

    Not sure how big a motor you are talking about. You can go to BaseTek website and select. BiD adjusters.
    You can get and idea how they are made. They utilize the stud itself.
    Just not sure how big of a machine you are talking about.