Buyers should check an excavator cooling fan hub and belt drive before ordering from China by confirming old fan photos, hub bearing play, pulley groove profile, belt width, blade clearance, mounting bolt pattern, engine model, overheating symptoms, included hardware and packing protection. A fan or belt-drive problem can be confused with radiator, water-pump, thermostat or oil-cooler faults, so PRIMA should save evidence before the buyer approves a replacement.
This page is part of the 2026-06-19 PRIMA fixed daily SEO batch and supports lawful second-hand equipment or replacement-parts export from China with real inspection, fitment, packing and document evidence.
Buyer Summary
- Use this page when overheating may come from fan hub, belt drive, fan blade or pulley evidence.
- Check old fan, hub, belt profile, pulley groove, mounting and engine context before price approval.
- Separate fan-drive faults from radiator, water pump, thermostat, oil cooler and dirty-stack problems.
- Before shipment, save packed-part photos, included hardware and real export documents.
Quick answer: what evidence makes the order safe?
A safe cooling fan hub order needs the old hub and fan photos, belt route, pulley groove, bearing condition, blade clearance, engine model and symptom notes. Buyers should ask whether the machine overheats at idle, under load or only with dust-packed cooling stacks. PRIMA should separate airflow, belt slip, fan damage, water-pump and radiator causes, then show the proposed hub or belt-drive parts with packing and included hardware.
Which symptoms point to fan hub or belt-drive risk?
Overheating does not automatically mean the radiator is bad. A loose belt, worn fan hub bearing, damaged blade, wrong pulley groove or weak airflow can produce similar symptoms. Buyers should record when the temperature rises, whether the belt squeals, whether there is bearing noise and whether the cooling stack is clean.
PRIMA should ask for a short video or photo set around the engine bay before recommending a part. The best quote explains why the fan hub or belt drive is suspected instead of quietly selling a convenient item.
| Area | Evidence to request | Risk reduced |
|---|---|---|
| Symptoms | overheating pattern, squeal and bearing noise | Wrong diagnosis |
| Airflow | fan blade and shroud clearance | Weak cooling |
| System | radiator, pump and thermostat context | Replacing the wrong part |
What identity evidence should the buyer compare?
The old fan hub, pulley, belt and mounting face should be photographed together. Buyers need pulley groove profile, belt width, bolt pattern, shaft or bearing area, blade count and engine model. If the replacement part changes one of these details, it should be treated as a conditional match until confirmed.
A fan hub can look close in a photo but fail because the pulley offset or mounting depth is different. Measurement photos help avoid a part that fits the bolt pattern but misaligns the belt.
| Area | Evidence to request | Risk reduced |
|---|---|---|
| Hub | old hub and mounting face photos | Wrong offset |
| Pulley | groove profile and belt width | Belt slip |
| Fan | blade count and clearance | Airflow loss |
How should condition and warranty boundary be stated?
Condition should be named clearly as new replacement, used, rebuilt or tested. Bearing play, pulley wear, cracked fan blades and belt condition should not be hidden behind a generic phrase like good quality.
PRIMA can export replacement or used cooling-system parts compliantly when the invoice and description match the goods. It should not imply official brand supply unless written proof exists for that exact scope.
| Area | Evidence to request | Risk reduced |
|---|---|---|
| Condition | new used rebuilt or tested | Expectation dispute |
| Bearing | play and noise evidence | Early failure |
| Claim | no unsupported official claim | Brand risk |
Which packing proof matters for fan and belt parts?
Fan blades, hub faces and pulley grooves can be damaged in transit. The parts should be wrapped so the blade edges do not bend and the hub or pulley face does not hit the crate wall. Belts should not be folded sharply.
The final file should show the approved fan hub or belt-drive parts, included bolts or spacers, protected packing and export label. This also helps the buyer’s workshop identify the parts when they arrive.
| Area | Evidence to request | Risk reduced |
|---|---|---|
| Fan packing | blade protection | Bent fan risk |
| Pulley packing | face and groove protection | Belt misalignment |
| Documents | invoice and packing list | Export mismatch |
Evidence Table
| Area | Evidence to request | Risk reduced |
|---|---|---|
| Identity | Old-part, machine or serial evidence | Wrong item |
| Function | Video, test, symptom or measurement proof | Wrong diagnosis |
| Condition | New, used, rebuilt or replacement boundary | Expectation dispute |
| Export | Packing, invoice and real document proof | Customs or transit risk |
Key Facts For PRIMA Buyers
- Overheating can come from airflow or belt drive, not only radiator failure.
- Pulley offset and belt groove profile should be checked before approval.
- Fan blades and hubs need packing that prevents bent edges and bearing damage.
- PRIMA should keep second-hand and replacement-part claims descriptive and document-backed.
Buyer FAQ
Does overheating always mean the cooling fan hub is bad?
No. Radiator blockage, water pump problems, thermostat failure, oil cooler issues and dust-packed screens can also cause overheating.
What measurements matter for a fan hub?
Pulley groove, offset, bolt pattern, shaft area, mounting depth and belt width should be checked.
Can belts be shipped with fan parts?
Yes, but the quote should show belt profile, size and whether belts are included in the order.
What should PRIMA save before payment?
Old-part photos, symptom notes, proposed part photos, condition, included hardware, packing and real export documents.
Useful PRIMA Links
- Excavator fan belts and cooling fans guide
- Excavator radiator buyer checklist
- Excavator water pump guide
Conclusion
PRIMA should treat this order as an evidence file, not only a price comparison. The buyer should see identity, condition, fitment, packing and real export documents before payment.