Service & Repair

Rewind and Full overhaul of 356KW 4Pole Leroy – Somer Trawler Motor

Motor Details: Leroy Somer: 356KW 4Pole 440/3/60Hz, V1 Mount IP23, Frame 315LG

JJ Loughran where recently asked to rewind and overhaul a critical motor for a large fishing vessel based in Ireland. At JJ Loughran we believe in the importance of being able to not only supply new motors, gearboxes and drives, but also to repair equipment back to original OEM standards. With state-of-the-art equipment including an IRD balancing machine and advanced test equipment, we can ensure all repairs are carried out to the highest standards.

It is not always cost effective to replace motors, drives and gearboxes, this is why JJ Loughran engineering workshop is so critical in helping to ensure we support our customers in the most effective and ethical way possible.

The full rewind and overhaul process of the 356KW 4Pole Leroy Somer Motor was completed in just under 2 working weeks, delivering a much faster solution to replacing the unit in question , The customer had  checked the availability of  a new machine which was on a 14 week lead time from the manufacturer and had a significant cost increase compared to the repair and overhaul which was carried out by JJ Loughran.

JJ Loughran not only stock a large range of electric motor spare parts including SKF bearings, seals, rewind copper, etc. We also have a machining department which can manufacture, new shafts, coupling, fans etc as required thus enabling our engineers to carry out quick turnarounds on mission critical pieces of equipment.

The work we carried out on the 356KW 4Pole Leroy-Somer Motor was as follows: –

  1. Mechanically dismantling motor into individual parts
  2. Electrically Inspect unit
  3. Check mechanical dimensions on front & back endcaps to ensure within machine tolerances
  4. Clean all individual parts
  5. Complete rewind of stator
  6. Varnish and stove stator
  7. Dynamically balance rotor
  8. Replace bearings with new SKF units
  9. Reassemble & test run motor
  10. Clean & respray unit back to original OEM paint specification
  11. Deliver equipment back to site.

We utilised our advanced test equipment,  to carry out the following tests before and after the overhaul to ensure the quality of the repair, and that all motor parameters were nominal and within manufactures tolerances. This give our customer the confidence the Electric Motor was overhauled to the highest standard.

  • Resistance
  • meg-Ohm
  • Surge
  • DC continuous ramped
  • step-voltage
  • polarization index (PI)
  • dielectric analysis

Project Details


January 3 2020


Service & Repair

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