| Day | What happened |
|---|---|
| Day 1 | Fourth inquiry for the same seal kit, "three replaced, three leaks." Stock confirmed by number — and we asked for photos of the bore and rod |
| Day 1 | Photos showed a scored dent inside the bore — the root cause. Every new seal was being cut at installation |
| The plan | Seal kit shipped as requested, plus head-prep notes (stone/fine emery around the bore, deburr, clean before fitting) |
| Day 5 | Kit arrived; customer polished the bore and fitted |
| One-year follow-up | Zero weeping. Customer's words: "The first three were parts-swapping — this one was a repair." |
| Root cause | How to check | Fix |
|---|---|---|
| Dented/scored head or bore | Shine a light into the bore | Polish the damage out before fitting |
| Rod scoring / plating flaking | Run a finger along the rod | Light: polish; heavy: re-chrome |
| Abnormal pressure spikes | Relief-valve pressure reading | Reset to spec before replacing parts |
| Aged shelf-stock seals | Check the supply channel and date | Buy fresh, properly sourced kits |
| Method | What you provide | Result |
|---|---|---|
| 1. Part number (fastest) | The part number / VOE number / CAT number — nothing else needed | Stock and price confirmed within minutes; 100% precise |
| 2. Model + serial number + year | e.g. EC210B + machine serial + year 2015 | The same model can have several versions — the serial number pins it down |
| 3. Photo of nameplate / old part | A clear photo of the machine nameplate, or the printed/stamped number on the old part | We verify fitment from the photo — our responsibility, not yours |
| 4. Fault description + replacement history | Briefly describe the symptom and whether/when this part was replaced before | We help judge what to replace — and whether a root cause is still hiding |
Send any one of the four to our online chat to lock in the right part. The more you share, the faster and more accurate the quote.
Tap through to our live parts search — check stock and send us the part number for an instant quote:
Light scoring: yes — stone or fine emery in a circular motion, never crosswise; deep damage goes to a cylinder shop for boring.
Bore size + part number is surest; no bore data? Photograph the nameplate or measure the old kit and we'll match it.
Bore and rod sound? A seal kit is by far the best value. Scored bore or bent rod? That's when an assembly makes sense.
Send it to our online chat — in-stock parts quoted the same day.