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cad-air-end-rebuilding

Home > Services > Compressed Air Division > Air End Rebuilding

Air End Rebuilding

Economical rebuild to like-new OEM specs

http://www.airendrebuilder.com/wp-content/uploads/rotors.jpg

MIT CAD rebuilds air ends for all rotary screw air compressors from 10hp up to 1000hp. With thousands of remanufactured air ends completed already, MIT CAD offers a reliable air end rebuilding service with prices that are unrivaled. Our air end rebuilding is the economical alternative to new high priced factory exchange air ends or factory rebuilt units.


We rebuild your air end and return it to you, like new. All rebuilds include new gaskets, bearings, o-rings, repair of rotors, seals, rebuilding the oil pump, metalizing the shafts, inlet valve rebuild, and end plate repair if needed. We can also service the drive motor, “clean & bake” the windings and install new seals and bearings on direct-drive units.
Depending on the size of the air end and the degree of damage, the entire process of rebuilding an air end takes approximately five to seven working days. Our shop is set up so the work flows through in an orderly manner to insure that we adhere to the highest inspection and quality controls standards.

Features of our air end rebuild:

  • Fast turn-around times
  • Remanufactured air ends to the OEM Specifications
  • Rotor Shaft Repair
  • Keyway Repair
  • End Plate Repair
  • Dynamic Rotor Balancing

Air End Rebuilding Process

airend rebuilding disassembled

A disassembled air end during the air end rebuilding process

Once we have received your air end, it is taken to the disassembly area which contains a mounting stand, overhead crane, and oil pit for collecting waste oil.

The air end is assigned a work order number and a job folder is generated to hold all documents related to the disassembly, teardown, and dimensional specifications. This folder stays with the air end through the whole rebuilding process to ensure accurate documentation from start to finish.

A polished end plate during the air end rebuilding process
A polished end plate during the air end rebuilding process

Once the air end is completely disassembled, the rotors, bearing carriers, and end plates are checked for wear. Pictures are taken identifying the problem areas and all measurements are recorded.

The disassembled air end is placed in a self-contained cleaning system to remove all grease, debris, and sludge.

After the air end is cleaned & degreased thoroughly, any parts that require machine work are brought to the proper areas in the shop and repairs begin.

This is a top view of an end plate by itself

Depending on the extent of the damage, the above work normally takes one to two days to complete.

All components are cleaned again and taken to the assembly area where bearings, gaskets & seals are pulled from inventory.

All dimensions are rechecked before assembly takes place, including the bearing pockets, bores and alignments. Both rotors are also checked for proper alignment and balance. The new bearings are measured for proper fit before installing them.

The air end is completely reassembled. After assembly the air end is spun unloaded for a final check. To insure that the OEM specs are being met, the unit is measured and rechecked for accuracy during the whole rebuilding process.

All open ports, upon completion, are plugged with plastic caps and the inlet is sealed shut. The air end is ready to be skid mounted and painted the original OEM color.

This is a finished, freshly painted rebuilt air end

As the built air end enter the shipping area, all shipping documents and startup procedures are attached to the unit, and shipping details are arranged.

This whole process normally takes 5 to 7 working days, depending on the air end size and extent of damage. We have setup our shop so the work flows through in an orderly fashion. This insures that adherence to our inspection steps and quality controls are strictly observed.


All air end rebuilds are backed by a 1 or 2 year warranty.

For additional information call us at 319.366.8363.