Replacing an air compressor in it’s entirety isn’t always an option. Most companies suggest that you replace the whole unit when the airend starts to make a noise. The associated costs of replacing the whole air compressor can add up quick, not to mention the labor to remove the old unit and install the new unit. Just because you hear a “growl” or suspect that a bearing is going out in the airend, doesn’t mean that it’s time to replace the whole air compressor. Consider rebuilding the airend. At Harris, we rebuild the airend and send it back to you with an assurance that you will be up and running with minimal costs.

Airend Rebuilding

For over 30 years, Harris has provided airend rebuilding from 5 to 500 horsepower for every brand of rotary screw compressor vacuum pump.

All rebuilt air compressors come with a 5 year airend warranty. A custom maintenance kit must be purchased annually which includes all filters, oil and oil analysis kits for quarterly analysis.

Airend Rebuilding Process

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.

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.

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.

end platemetalizing

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

rotorrotorrotor on lathe

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

end plate

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

seal strip

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

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.

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.

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.

All rebuilds are backed by our standard one-year, 8,000 hour warranty or our extended two-year, 16,000 hour warranty.