ELGI Rotary Screw Air End Repairs & Rebuilds | All Models

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ELGI Rotary Screw Air End Repairs & Rebuilds | All Models

  • Industry Leading 5 Year Warranty
  • Remanufactured to Exacting Standards
  • Engineered to Outperform Factory Exchange Units
  • 1 or 5 Year Warranty on all Rebuilds
  • Average Rebuild Time 5-7 Days
  • Free Lubricant Analysis Included using our recommended lubricant
  • Full-Service, In-House Machine Shop
  • Sealing Strip Repair
  • Dynamic Rotor Balancing

Airend Rebuilding Process

Disassembly and inspection

Once the airend is received it is unloaded and taken immediately to the disassembly area, which contains mounting stand, overhead crane and oil pit for collecting waste oil.  The job is then assigned a work order number, and a folder is generated for disassembly, teardown and spec sheets.  This folder follows the airend through the entire rebuilding process to ensure accurate documentation.

Once the airend is disassembled, all components are checked for wear & measurements are recorded.  Pictures are taken identifying the problem areas.

Cleaning and degreasing

The disassembled airend is then placed in one of the self-contained cleaning systems. After the airend is completely cleaned & degreased, all parts that require work are brought to different areas of the shop and the repairs begin.

Repair and recondition

If necessary, the following repairs will be made:

1. The front and rear covers can be metalized using the thermal ARC system & then machined by either the 20” or 36” Blanchard grinder.

2. The rotors can be mounted and turned on a lathe. Bearing journals can be metalized and ground according to specs.

3. The main bore area can plated and bored on a vertical boring mill.

4. Seal strips can be built up and re-cut on a custom jig.

Depending on the extent of the damage, the above work normally takes 1 to 2 days to complete.

New bearings, seals and gaskets

All components are then rewashed and taken to the assembly area, where all the bearings, seals, gaskets, and related materials needed to complete the assembly are pulled from inventory.

Quality Control

Before assembly takes place all the bearing pockets, bores, and alignments are rechecked.  The two rotors are then checked for proper balance and alignment. The new bearings are re-measured for proper fit before installing.


The airend is then completely reassembled.  After assembly the airend is spun unloaded for a final check. To insure that the manufacturer’s specs are being met, the unit is continually measured and re-checked for accuracy.

Painting and finishing

Upon completion all open ports are plugged with plastic caps and the inlet is taped shut.  The airend is now ready to be skid mounted and painted the original O.E.M. color.

As units enter the shipping area, all necessary shipping documents and start-up procedures are attached to the unit, and trucking details are arranged.

This whole process normally takes 5 to 7 working days, depending on the size of the airend and the degree of damage.  We have setup our shop so the work flows through on an orderly path to insure that all our inspection steps and quality controls are adhered to.

Complete warranty coverage

All rebuilds are backed by our standard one-year, 8,000 hour warranty or our extended two-year, 16,000 hour warranty. See the airend warranty sheet for additional information.



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