A repair quotation is a formal, substantiated calculation of the cost and turnaround time of a motor repair, prepared after the machine has been physically inspected and its faults identified. Unlike a preliminary photo-based estimate, a quotation is not based on a visual guess — it is based on faults that have actually been found, which is why it can be far more precise.
This article covers the stages that make up a repair quotation, what goes into the price calculation, how the turnaround time is estimated, which documents the customer receives, and what happens if additional issues are found once repair work has already begun.
A preliminary photo-based estimate is a rough, informal price range a specialist can give remotely, before the motor has even physically arrived at the workshop. It is based on visible external signs, typical faults of similar machines and prior experience, so it always stays approximate and can change significantly after a physical inspection.
A repair quotation is the next, far more precise stage. It is prepared only after the machine has gone through intake inspection, partial or full disassembly and fault detection — that is, once the actual condition of every unit has been confirmed by measurement and inspection, not just by a photograph.
A photo-based estimate answers "roughly how much could this cost". A repair quotation answers "how much will repairing this specific motor cost, given the faults that were actually found".
Each of these steps is covered in detail below.
A quotation cannot be prepared without fault detection — this is the key difference from a photo-based estimate. The motor is received, its nameplate data, external condition and the customer’s complaint are recorded, and it is then disassembled to the extent needed for diagnostics.
Fault detection covers the electrical side — insulation resistance, winding resistance, phase symmetry, interturn insulation, the condition of the commutator or slip rings — alongside the mechanical side: the shaft, bearing seats, bearings, fan, housing and fasteners.
The outcome of this step is a complete, documented list of faults — it is this list, not a visual impression, that becomes the basis for the quotation that follows.
Every fault found is translated into a specific repair operation. For example, based on fault-detection findings the scope of work might look like this:
This list is drawn up individually for each machine — it is not a generic template, but a direct consequence of what fault detection actually found.
The cost in a quotation is not a single figure — it is the sum of separate line items, each tied to a specific operation from the scope of work:
This is why a repair quotation is, in effect, an itemized estimate: the customer sees not just the total, but what it is made of.
The turnaround time depends directly on the scope defined in step 2. A simple repair involving bearing replacement without rewinding usually takes less time than a repair that includes a full winding rewind, manufacturing a new commutator, or waiting for materials that are not currently in stock.
Turnaround is also affected by the workshop’s current workload, the need to procure certain items externally, and the scope of testing required for that particular type of machine.
The estimated turnaround time is always communicated together with the price — as part of a single commercial proposal, not separately from it.
Following fault detection and the quotation, the customer is typically provided with:
This set of documents lets the customer understand not only the final price, but exactly what they are paying for, and to agree or adjust the scope of work before the repair begins if needed.
A photo-based estimate always has a limit to its accuracy — a photograph shows only the external condition and cannot confirm insulation resistance, the condition of bearing seats, hidden cracks or interturn faults in the winding.
A repair quotation is prepared only after physical disassembly and measurement, so it rests on confirmed facts rather than assumptions. That is why the final cost stated in the commercial proposal is a far more reliable basis for a decision than the earlier, rough range.
Even thorough fault detection cannot always reveal absolutely everything — some damage only becomes visible after a unit is fully disassembled, a winding is removed, or a core stack is taken apart. This is normal practice when repairing complex equipment, not a sign of poor diagnostics.
If a fault is found during repair that was not part of the original quotation, the standard practice is to notify the customer, explain the finding, and agree the change in scope and cost before work continues. Work that falls outside the approved quotation is not carried out without separate approval.
It depends on the complexity of the machine and the scope of fault detection: the simpler the motor and the fewer units that need a detailed check, the faster the quotation is ready. An exact estimate is best confirmed individually when the motor is received.
Terms are assessed on a case-by-case basis and agreed before work begins, depending on the scope of fault detection, the type of machine, and how much disassembly is required.
That is expected and does not mean the earlier estimate was wrong — it was always rough and informal. The quotation is based on actual fault detection, which is why it is the figure to base a repair decision on.
Yes — the commercial proposal is a basis for the customer’s decision, not an automatic start of work. The repair begins only once the scope and cost have been agreed.
Labour for each operation, materials and parts, the cost of externally sourced items where needed, and control testing plus preparing the protocol.
Because the scope of work is defined not roughly but from actually measured parameters — the size, fit and condition of that specific unit.
It may. If an additional fault requires extra operations or materials, the customer is notified and an updated scope, cost and timeline are agreed before the repair continues.
Electropromremont LLC prepares a detailed, itemized commercial proposal once fault detection is complete and before any repair work begins — the customer receives a clear list of operations, materials and parts with the cost of each line, rather than a single rough figure. This approach allows the scope of the repair to be agreed knowingly and avoids surprises once work is under way.
This material is for informational purposes. The values, diagnostic methods, scope of work and recommendations given here are general and do not replace the manufacturer’s technical documentation. The final decision for a specific machine is made from its own diagnostics and inspection, taking into account its type, power, design, duty, operating history and applicable standards.
We will carry out fault detection, define the actual scope of work, and prepare a detailed commercial proposal with an estimated turnaround time.