Before buying an excavator sprocket, buyers should confirm tooth profile, segment or full sprocket type, bolt pattern, hub dimensions, track-chain pitch, chain wear, idler and roller condition, because a new sprocket can wear quickly if it is matched to the wrong or worn undercarriage.
Excavator sprockets are high-risk undercarriage parts because they must match the track chain. A hooked sprocket, stretched chain or wrong pitch can create early wear even when the new part is well made. This page supports the undercarriage parts guide, the track-chain fitment guide and the excavator parts supplier guide.
Buyer Summary
- Sprocket quotation should confirm tooth wear, chain pitch, segment type, bolt pattern and hub dimensions.
- A sprocket should be evaluated with track chain, idler and roller condition, not as an isolated part.
- Segment sprockets and full sprockets require different photo and measurement evidence.
- Packing should protect teeth, bolt holes and machined surfaces during export shipment.
What sprocket details should be confirmed before quotation?
The buyer should send machine identity, old-sprocket photos, tooth count or segment details, bolt pattern, chain pitch and destination.
A sprocket can be a full wheel or segmented set, and the same excavator family may have variations in bolt pattern, hub, tooth profile or chain match. Buyers should send photos from the side, face and mounting area. If the sprocket is segmented, photos should show one segment removed or a clear view of the bolt pattern and segment shape.
PRIMA should ask whether the buyer is replacing only one sprocket, both sides or a wider undercarriage set. If the old chain is badly worn, a new sprocket alone may not last. A strong quote connects the sprocket option with chain condition, roller condition and idler alignment.
| Data | Evidence | Why it matters |
|---|---|---|
| Sprocket type | Full wheel or segment photos | Avoids wrong structure |
| Mounting | Bolt pattern and hub photos | Prevents installation failure |
| Chain match | Pitch and chain wear evidence | Controls early wear |
How to judge sprocket tooth wear and chain pitch mismatch
Hooked, sharp, thin or uneven teeth can show chain mismatch, stretched chain or long service wear.
A worn sprocket may have hooked teeth, uneven side wear, sharp tooth tips or a narrowed profile. If the track chain pitch has changed due to wear, the sprocket and chain no longer mesh smoothly. Replacing only the sprocket may create noise, vibration or rapid wear on the new component.
Buyers should photograph the sprocket teeth with enough side detail, and also send chain pitch and link-count evidence when possible. PRIMA can then advise whether the sprocket can be quoted alone or whether chain, idler and roller condition should be reviewed together.
| Wear sign | Likely issue | Quote response |
|---|---|---|
| Hooked teeth | Worn chain or long service | Check chain pitch |
| Side wear | Alignment or track-frame issue | Check idler/roller path |
| Broken tooth | Impact or severe wear | Inspect surrounding parts |
How segment type, bolt pattern and hub dimensions affect fitment
Segmented sprockets need segment shape and bolt pattern proof; full sprockets need hub and mounting dimensions.
Some excavators use sprocket segments bolted around the drive hub, while others use a full sprocket. Segment count, bolt-hole spacing, tooth count and segment curve must match. For full sprockets, hub diameter, bore, thickness and mounting face are more important. Photos should show the mounting side, not only the worn tooth side.
PRIMA should keep measurements in the quote file and avoid final confirmation when the buyer only sends a catalog name. A wrong bolt pattern can make an otherwise correct-looking sprocket impossible to install.
| Sprocket form | Evidence needed | Main risk |
|---|---|---|
| Segment type | Segment shape and bolt spacing | Wrong segment set |
| Full sprocket | Hub, bore and face dimensions | Cannot mount |
| Mixed old parts | Actual photos from both sides | Previous nonstandard repair |
How sprocket, track chain, rollers and idlers should be checked together
The sprocket is part of the undercarriage system, so chain, roller and idler evidence should support the final choice.
If the track chain is stretched, the new sprocket may wear quickly. If rollers or idlers are seized, the chain path can load the sprocket unevenly. If track tension is incorrect, tooth engagement can suffer. Buyers should show the full undercarriage condition before asking PRIMA to confirm only the sprocket.
This does not mean every order must include a complete undercarriage set. It means PRIMA should document the risk clearly. For budget repairs, a sprocket-only order can still be reasonable when the buyer understands the remaining-chain condition and accepts the service-life tradeoff.
| Related part | Check | Effect on sprocket |
|---|---|---|
| Track chain | Pitch, link count, bushing wear | Tooth engagement |
| Idler | Alignment and tension | Chain path |
| Rollers | Seized or uneven wear | Load distribution |
How PRIMA packs sprockets and confirms shipment evidence
Sprocket teeth and machined faces should be protected so the part arrives ready for installation.
Sprockets are heavy enough to damage crates or other parts if they shift in transit. Teeth, bolt holes and mounting faces should be protected from impact and rust. Segment sets should be kept together and photographed as a complete set before packing.
Before shipment, PRIMA can provide actual-part photos, dimension confirmation, crate photos, labels and document match. This evidence helps dealers and repair shops verify that every sprocket or segment set belongs to the correct machine after arrival.
| Packing item | Proof | Buyer value |
|---|---|---|
| Teeth protection | Padding and separation | Prevents impact damage |
| Segment grouping | Complete-set photo | Avoids missing pieces |
| Shipment match | Labels and packing list | Simplifies receiving |
Evidence Table
| Buyer question | Evidence PRIMA should request | Value |
|---|---|---|
| Which sprocket fits? | Old-sprocket photos, bolt pattern and hub dimensions | Prevents mounting mismatch |
| Will it match the chain? | Pitch, link count and chain wear evidence | Reduces rapid wear |
| Can segments ship complete? | Set photos, crate photos and labels | Avoids missing pieces |
Buyer FAQ
Should I replace sprocket and track chain together?
Not always, but chain pitch, link wear and sprocket tooth wear should be checked together before deciding.
What photos should I send for a sprocket quote?
Send machine serial plate, old sprocket from both sides, tooth close-up, bolt pattern, hub area and track-chain condition.
Is a sprocket segment the same as a full sprocket?
No. A segment is one bolted section of the sprocket ring, while a full sprocket is a complete wheel or assembly.
Conclusion
Excavator-sprocket sourcing should confirm tooth wear, chain match, bolt pattern and export packing as one evidence file. PRIMA can reduce wrong-part and early-wear risk by checking the undercarriage system before final quotation.
References
- Berco undercarriage products: Industry reference for sprocket and undercarriage component categories.
- CAT undercarriage reference: General undercarriage-system reference.