Rotary Hammer Warranty Returns: Should You Refurbish, Resell or Scrap Them?

Last updated: October 26, 2026 · Reading time: 13 min · Written by the ETpower engineering team (Taizhou XuLi Machinery Co., Ltd.)

Ask a distributor what happens to warranty returns and the honest answer is usually some version of "they sit in a cage until someone decides". That is expensive in a way that never appears on a P&L line. A returned machine is inventory you have already paid for, freight you have already absorbed twice, and a customer whose opinion of your brand is being written in the three weeks it takes you to answer them.

What we see across the markets we ship to — Eastern Europe, the Middle East, South and Southeast Asia, South America — is that most returns operations make one of two mistakes. Either everything gets repaired regardless of cost, because scrapping feels like admitting failure, or everything gets written off, because triage was never set up. Both lose money. The difference between them is usually a single spreadsheet and about forty minutes of bench time per machine.

This is the model we walk through with distributors who are setting up or fixing a returns process. It is written for importers and distributors rather than end users, and it assumes you already have the commercial terms in place — if you do not, start with our guide to writing rotary hammer warranty terms that actually hold, because the return path is only ever as clean as the policy that created it.

Quick answer (TL;DR)

• Triage before you repair. Four grades — DOA, early-life failure, cosmetic B-stock, end-of-life — and each has a different correct outcome.
• Cost the whole stack, not just the parts. Freight, intake labour, test time and repacking routinely exceed the parts bill.
• Refurbish if the total is under 30–40% of new landed cost. Above that, strip it for parts.
• Never describe a refurbished machine as new. Distinct stock code, accurate description, stated shorter warranty, written test record.
• Retest electrically before resale — earth continuity, insulation resistance, functional run — and keep the record.
• Build a donor pool. One scrap machine typically yields three to six reusable assemblies.
• Sell B-stock through a different channel, or you will discount your own new machines.

1. Triage into four grades before you touch a spanner

The single biggest saving in returns handling is deciding what a machine is before anyone starts repairing it. Four grades cover almost everything that comes back, and each one has a default answer.

Grade C is where the free money is, and it is the grade most operations never separate out. A machine that works and has a crushed carton is not a warranty claim; it is a repacking job worth most of the unit's value. Sorting it out on day one — before it goes into the same cage as genuine failures — turns a write-off into a sale in about fifteen minutes of bench time.

Grade A is the one to argue about with your supplier, and you should. A genuine dead-on-arrival machine is a manufacturing or logistics defect, not a warranty event, and it should be credited separately. That distinction only works if you can show the data, which means logging DOA separately from field claims from the first container onward.

2. What one returned machine actually costs you

Parts are the visible cost and rarely the biggest one. Here is the full stack, with the figures we use when a distributor asks us whether a returns operation is worth building.

Add the middle of those ranges and a straightforward repair lands somewhere around USD 25–45 of true cost per unit before you count the write-down, on a machine that might have landed at USD 40–50. That arithmetic is why the ceiling rule in section 5 matters, and why the freight line deserves a conversation with your customers: a returns policy that requires the end user to ship a four-kilogram machine back at their own expense is not a policy most of them will use, which sounds like a saving until you realise you have also bought a reputation.

3. DOA and early-life failure are two different problems

These get lumped together and they should not, because they have different causes, different costs and different owners.

DOA is a factory and logistics number. A machine that fails on first use has a defect that was present when it left: a connection that was not seated, a brush spring that was not located, a casting flaw, a switch that failed its first hundred cycles — or damage in transit. Realistic targets for corded Rotary Hammers are under about 0.5 to 1% of units shipped. Sustained rates above roughly 2% are not bad luck; they are an inbound inspection gap, and the fix belongs at the loading dock with a first-article and AQL process, not at the service bench.

Early-life failure is an application number. A machine that works for six weeks and then comes back with worn brushes has usually been asked to do something its duty class does not cover — continuous chiselling on a drilling machine, for example, or a bit left in rotation-stop until the shank rounded. First-year claim rates in the 2 to 5% band are normal for the category and are not evidence of a bad product. They are evidence of a range that needs matching to application, which is a sales conversation rather than a quality one.

Separating them changes what you do. DOA gets root-caused and credited. Early-life gets repaired, and the failure code gets fed back into training and into the range decision. Both get logged, because without the split you cannot tell which problem you actually have. Our spare parts kit guide shows how to convert those failure codes into a stocking ratio — brush sets and switches high, gearboxes low — which is the same data working a second job.

4. What "refurbished" means — and why it is not "new"

This is the section with legal teeth, and we would rather be blunt about it than helpful-sounding. A machine that has been sold once, used, and returned cannot be described as new. That is true whether it failed, was a cancelled order, or simply had its carton damaged in a warehouse. The moment it leaves your stock as a sale, it is a used product.

Three consequences follow, and they are practical rather than theoretical:

• Description. The listing, the carton and the invoice must say what it is. "Refurbished", "reconditioned" or "B-stock" with a one-line description of what was done to it. In the EU, statutory guarantee rights — typically two years, three in Spain — still run on the second sale, so describing a unit as new does not shorten your exposure; it just misstates it.
• Safety testing. Any machine that has been opened should be electrically retested before it goes back out. The widely used portable-appliance thresholds are an earth-bond resistance below about 0.1 Ω and insulation resistance above 1 MΩ, plus a functional run test. Which standard applies, and the exact pass values, differ by market — confirm them with a local test house rather than copying a number from an article. Double-insulated (Class II) machines have no earth conductor, so the earth-bond test does not apply and the insulation test carries more weight.
• Traceability. Keep the serial number, the failure reason, the work done and the test result together. Ten years is a defensible retention period and matches the parts-availability window serious programmes commit to. When a claim arrives eighteen months later, that record is the difference between a decision and a guess.

On certification specifically: a CE or EAC mark on a machine relates to it being placed on the market. Repairing a machine with genuine parts does not remove that, but rebuilding one into something different, or re-marketing it as new, is a different activity with different obligations. Our certification guide for CE, EAC and INMETRO sets out where those lines sit for new product; take local advice before you build a refurbishment line that ships across borders.

5. The refurbish-or-scrap rule

Do not make this decision by looking at the machine. Make it with the cost sheet from section 2 and one number: the landed cost of an equivalent new unit.

Refurbish if the full cost — freight, labour, parts, test, repack — is below roughly 30 to 40% of new landed cost. Above that, strip it for parts. The same threshold we recommend for chuck replacement on a single machine applies at the portfolio level, for the same reason: past that point you are spending real money to create an asset worth less than what you spent.

Worked example, using round planning numbers rather than a quote. A 26 mm machine landing at about USD 42 gives a ceiling of roughly USD 13–17. A brush-and-switch job at USD 8–12 of true cost clears it comfortably and returns a machine worth most of its value. A gearbox and armature job at USD 25–35 does not, and it should be stripped instead — even though the machine looks repairable, because it is, and that is precisely the trap.

Two adjustments worth building in:

• Cosmetic returns bypass the rule. Grade C machines have near-zero repair cost, so the only number that matters is the write-down, and you take that either way. Repair them all.
• Strip value counts against the cost. A scrap machine is not worth zero. If a donor typically yields USD 20–40 of reusable assemblies, then the true cost of scrapping is negative, which makes the refurbish side of the comparison harder to clear — and pushes more machines into the donor pool, which is the right answer.

6. Shared parts platforms are what make refurbishment viable

Here is the variable that decides whether any of this is economically sensible, and it is decided at the point of purchase rather than at the bench: how many parts are shared across the range.

A fleet drawn from one platform, where the chuck assembly, brush set, switch, cable and gearbox internals are common across the 20, 26 and 28 mm classes, turns returns into a parts inventory you already own. A fleet assembled from three unrelated suppliers makes every return a special case with its own part number, its own lead time and its own minimum order — which is how returns cages fill up and stay full.

Concretely, on the ETRH2-20, the ETRH2-26 and the ETRH2-28, the service items that generate most warranty claims — brushes, switch, chuck assembly, cable — are shared across the platform. That has two effects we can quantify for a distributor: a smaller first spare-parts order, and a returns bench that can complete most repairs the same day rather than waiting on a part. Our 26mm sub-category is the clearest example, because four models share the same service matrix.

When you are evaluating a supplier, ask for the shared-parts matrix before you ask for the price list. It is a better predictor of your total cost of ownership than the unit price is, and almost nobody asks for it.

7. The donor pool: harvesting parts from what you scrap

Every grade D machine is a parts kit that someone else would charge you for. Set up a bench tray system and label the assemblies as they come off, and the scrap cage becomes the cheapest inventory you will ever hold.

Run the volume and it becomes material. A distributor moving 10,000 units a year at a 3% claim rate sees roughly 300 returns. If even three reusable assemblies come off each scrap machine, that is around 900 assemblies a year — a meaningful share of a first-year parts requirement, at no purchase cost and no freight. It also de-risks the parts order itself: you can buy conservatively knowing the donor pool covers the surprises.

Two rules keep a donor pool honest. First, never fit a harvested part you have not tested — you are converting a known scrap machine into an unknown refurbished one, and the test in section 4 is what stops that. Second, log donor and recipient serial numbers together. If a claim comes back on a machine with a harvested gearbox, you want to know which donor it came from.

On cordless returns, stop and separate the batteries before anything else. Do not repack or rebuild lithium cells in a general workshop: cell matching, thermal behaviour and transport classification make this a specialist activity, and a damaged pack belongs with a licensed recycler rather than on your bench. Our battery platform guide covers the transport and lifecycle side in more detail.

8. Selling B-stock without cannibalising new sales

The failure mode here is predictable: the refurbished units go onto the same shelf, at 30% off, and the sales team discovers that customers who would have bought new are now buying B-stock. You have recovered the return and discounted your own margin at the same time.

Four rules keep the two channels apart:

• Different stock code. A suffix on the SKU — REF, -R, or a separate B-stock series — so it is visible in the system, on the invoice and in the sales report. If your ERP cannot distinguish them, your margin analysis cannot either.
• Different channel. Service counters, factory outlet, online clearance, tender and secondary markets, or a different geography. Not the same distributor shelf at a lower price.
• Shorter, stated warranty. Six to twelve months against twelve to twenty-four on new, written on the invoice. Buyers accept this readily when it is stated up front and resent it when it appears later.
• Honest condition grading. A simple A/B/C cosmetic grade with one line each. It reduces disputes more than any amount of small print, and it makes the price difference self-explanatory.

Pricing sits typically at 55–70% of new wholesale, depending on how the local market reads "refurbished". Below half price you are not selling refurbished any more, you are selling suspicion, and the customer assumes something is wrong with the machine.

9. FAQ

What is a good DOA rate for imported power tools?

For corded rotary hammers, a dead-on-arrival rate below roughly 0.5 to 1% of units shipped is a realistic target, and anything sustained above 2% points at a packing, handling or inbound inspection problem rather than bad luck. DOA is a factory and logistics number. First-year claim rates of 2 to 5% are a separate and much larger population, and they are driven by application and duty cycle.

When should a returned machine be scrapped instead of repaired?

Use a ceiling, not a feeling. Add inbound freight, inspection labour, parts, test time and repacking, and if the total exceeds roughly 30 to 40% of the landed cost of an equivalent new machine, strip it for parts instead. The rule flips for cosmetic returns, where the repair cost is almost zero and the only real cost is the write-down.

Can I resell a refurbished rotary hammer as new?

No. A machine that has been sold, used and returned cannot be described as new, and in most markets the statutory guarantee period still applies to the second sale even when it is described as refurbished. Sell it under a distinct stock code, describe the condition accurately, state the shorter warranty in writing, and keep the test records that show it is electrically safe.

What electrical tests should a refurbished tool pass before resale?

At minimum a visual inspection, an earth-bond continuity check and an insulation resistance measurement, plus a functional run test. Thresholds commonly used in portable appliance testing are an earth-bond resistance below about 0.1 ohm and insulation resistance above 1 megohm, but the standard applied and the pass values differ by market, so confirm them with your local test house rather than copying a number from a blog.

Is it worth harvesting parts from scrapped machines?

Usually yes, if the fleet shares parts across models. A scrap rotary hammer typically yields three to six reusable assemblies: gearbox, armature and stator, chuck assembly, switch, cable and housing. At a 3% claim rate on 10,000 units a year that is roughly 300 machines, which can supply a meaningful share of a first-year spare parts requirement at almost no purchase cost.

10. Conclusion

Returns are not waste. They are a mixed population of machines in which roughly a fifth need nothing more than a new carton, most of the rest can be repaired inside a defined cost ceiling, and the remainder are worth more as parts than as tools. The difference between a returns operation that costs money and one that recovers it is not better technicians — it is a triage grade, a cost sheet and a rule that is applied before anyone picks up a screwdriver.

Set the ceiling, split DOA from field failure, keep the test records, and push the shared-parts question back onto your suppliers at purchase time. Those four things decide the number long before the first machine comes back.

Building or fixing a returns process? Send us your annual volumes and current claim rate and we will share the shared-parts matrix for our range and a suggested first-year service parts package. You can review the ETpower rotary hammer range and the 28mm sub-category to see which models share which service items, and our company profile explains how we handle claims and parts supply from Taizhou.

Request the Shared-Parts Matrix & Service Kit →

This article is maintained by the ETpower engineering team. Last reviewed on 26 October 2026. All cost bands, claim rates, DOA targets, refurbishment thresholds and part values are planning figures drawn from distributor practice and our own service experience; they are indicative, not quotations or guarantees, and will vary with freight market, labour rate, product mix and local regulation. The legal and electrical-safety comments are general information and not legal or compliance advice: statutory guarantee periods, resale disclosure duties, waste-electrical obligations and electrical test standards differ by jurisdiction — confirm them with qualified local counsel and a local test house before establishing a refurbishment or resale programme.