LTC Rebuild
When contact replacement is not enough. Full disassembly, in-house machined replacement contacts, diverter and selector switch reconditioning, drive mechanism overhaul, oil service, test, and documentation. GE, McGraw-Edison, Allis-Chalmers, Westinghouse, Moloney, and more.
Contact replacement gets most LTCs back in service. The main moving contacts, arcing contacts, and reversing switch contacts wear on a predictable schedule, and swapping them at the right interval prevents the failure modes that cause transformer outages.
A full rebuild is the right call when the unit has accumulated significant switching operations and mechanism wear is visible beyond the contacts, when oil analysis shows contamination consistent with internal arcing rather than normal contact erosion, or when the drive mechanism shows binding, irregular motion, or fatigue in the spring or cam hardware.
The distinction matters because a contact kit that goes into a mechanism with worn diverter switch hardware or degraded spring tension will not last its rated service interval. You are replacing the cheap part and leaving the failure mode in place.
We evaluate each unit on arrival and tell you what we find before we proceed. If contact replacement is all the unit needs, that is what we quote. If the mechanism needs more, we show you why.
Full teardown of the LTC compartment. Every component inspected and photographed. Wear measurements documented against OEM tolerances before any parts are replaced.
Main moving, main stationary, arcing, reversing, and neutral contacts replaced with new parts machined in our Palm Harbor shop. No third-party sourcing delays — we make them here.
Diverter switch contacts and transition resistors inspected and replaced as needed. Housing cleaned and inspected for pitting or erosion beyond contact surfaces.
Selector switch contacts inspected, cleaned, and replaced where worn. Mechanical motion verified through full tap range. Locking hardware and latching verified.
Spring mechanism, motor drive, cams, and position indicators serviced. Worn hardware replaced. Timing verified against OEM spec.
Oil drained, compartment cleaned, new insulating oil to spec. Final contact resistance measurement, operational cycling through full tap range, and documentation package with before/after readings.
We carry replacement contacts in stock or machine them to order for every major LTC family. Because we make the parts ourselves, we are not dependent on a third-party supplier's lead time when your transformer is out of service.
One of the most common LTC families in US distribution and transmission transformers. Full contact sets in stock.
The 550 series is installed in a significant portion of the US transformer fleet. Cooper dropped support; we kept making the parts.
Full contact sets for all major Allis-Chalmers reactor-type LTCs, including the complete TLH-21 isolated reversing kit.
Reactance-type LTCs. Eaton discontinued support; the contact geometry is documented in our shop archive.
Transfer switch and selector switch contacts for Moloney transformers. Canadian-built units common in cooperative fleets.
FPE was discontinued decades ago. Reinhausen RMV-1 parts machined to original drawing dimensions.
Most LTC rebuild shops source their replacement contacts from an aftermarket supplier and wait on that supplier's lead time before the rebuild can start. We machine the contacts in our own shop in Palm Harbor. When your transformer is out of service, that difference matters.
We also operate field crews across Florida and the Southeast. If you need the LTC pulled from the transformer, transported to the shop, rebuilt, and reinstalled, that is one crew, one company, one call. No coordinating between a parts supplier, a rebuild shop, and a field contractor.
No third-party sourcing. We machine replacement contacts to OEM dimensions in our own shop, in stock or to order.
Pull it, rebuild it, reinstall it. FL and Southeast coverage. One point of accountability from the field to the finished unit.
Before and after contact resistance readings, operational test results, parts replaced, and oil test report. Delivered with the unit.
Full catalog of replacement LTC contacts for all major OEM families. Order parts for your own maintenance crew.
On-site LTC inspection, contact resistance testing, oil sampling, and field maintenance. FL and Southeast coverage.
Full shop rebuild of circuit breakers — air, vacuum, oil, and SF6. Same shop, same crew.
Part no longer available? We reverse-engineer from a sample, a print, or a model number and machine to OEM spec.
We respond within one business day with a clear scope and timeline. If you have oil analysis results or tap position history, include them — they help us scope the job accurately.