6136-21-7120 Radiator Cap supports coolant sealing and system pressure retention for B2B excavator parts maintenance, stocking, and wholesale sourcing.
The 6136-21-7120 Radiator Cap YNF18809 is a cooling-system service component installed on the compatible radiator filler neck. After coolant inspection or replenishment, the cap is secured so the cooling circuit can remain properly sealed during engine operation.
A radiator cap performs more than a simple closing function. Pressure is retained within the cooling system according to the cap specification, while coolant movement can be managed through the corresponding overflow or recovery arrangement where applicable. A damaged seal, weakened internal mechanism, or incorrect cap specification may contribute to coolant loss or unstable cooling-system operation.
For B2B buyers, the 6136-21-7120 radiator pressure cap should be verified by part number, filler-neck dimensions, locking structure, sealing interface, pressure specification, and existing-part photos. Since no machine model has been supplied, physical and reference-number matching should be prioritized before bulk purchasing.
| Parameter | Specification |
|---|---|
| YNF Part Number | YNF18809 |
| Part Number | 6136-21-7120 |
| Product Name | Radiator Cap |
| Alternative Name | Radiator Pressure Cap / Water Tank Cap / Coolant Filler Cap |
| Product Type | Cooling System Pressure and Sealing Component |
| Parts Category | Engine Cooling System Parts |
| Main Function | Radiator Sealing and Cooling-System Pressure Retention |
| Application | Compatible Construction Machinery Cooling System |
| Installation | Radiator Filler Neck |
| Machine Model | To Be Confirmed by Part Number and Physical Fitment |
| Pressure Rating | To Be Confirmed from Cap Specification |
| Fitment Check | Part Number / Cap Diameter / Filler Neck / Locking Structure / Pressure Rating / Existing Part Photo |
| Quality Type | Aftermarket Replacement |
| Condition | New |
| Brand | YNF |
| Origin | China |
| MOQ | 1 Piece |
| Shipping Method | Air, Sea, Express |
| Payment Terms | T/T, PayPal, Western Union |
| Application | Description |
|---|---|
| Engine Cooling System | Used on compatible radiator filler openings |
| Radiator Sealing | Helps coolant remain contained within the cooling circuit |
| Pressure Retention | Supports the designed cooling-system pressure |
| Coolant Service | Removed and reinstalled during coolant inspection or filling |
| Radiator Repair | Suitable when the original cap is damaged or sealing poorly |
| Cooling Maintenance | Can be checked during overheating or coolant-loss diagnosis |
| Repair Workshop | Practical for professional machinery maintenance |
| B2B Parts Stocking | Suitable for dealers, wholesalers, and importers |
Q: What is YNF18809?
A: It is a radiator cap with reference number 6136-21-7120.
Q: Is this only a simple tank cover?
A: No. A radiator cap also supports sealing and cooling-system pressure retention.
Q: Is a machine model supplied?
A: No. Fitment should be confirmed by part number, filler-neck dimensions, cap structure, and photos.
Q: Should the pressure rating be checked?
A: Yes. The pressure specification should be compared with the existing cap before replacement.
YNF Machinery supplies 6136-21-7120 radiator caps and related engine cooling-system components for machinery repair workshops, parts dealers, wholesalers, fleet maintenance businesses, and international importers.
The YNF18809 radiator pressure cap is a compact maintenance part that can be conveniently stocked together with radiators, coolant tanks, hoses, thermostats, and water pumps. However, caps with similar external appearances can use different filler-neck structures or pressure specifications.
Professional B2B buyers can provide the 6136-21-7120 part number, required quantity, cap dimensions, filler-neck measurements, pressure marking, locking structure, and clear photos of the existing cap for confirmation.
Related cooling-system components can also be consolidated into the same inquiry, helping distributors build practical maintenance inventory while reducing fragmented purchasing and international shipment costs.
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