277-4837 Coolant Reservoir supports overflow recovery and coolant reserve management for B2B excavator parts repair, stocking, and wholesale sourcing.
The 277-4837 Coolant Reservoir YNF18818 is used as an auxiliary tank within a compatible heavy-equipment engine cooling system. As coolant temperature changes during machine operation, coolant volume can expand and contract. Excess coolant may be directed into the reservoir and returned to the cooling circuit according to the system design.
This part may also be referred to as a coolant sub tank, radiator overflow tank, expansion reservoir, coolant recovery tank, or auxiliary water tank. It should not be confused with the main radiator, because heat exchange is not its primary function.
For B2B buyers, the 277-4837 reference should be checked together with the tank shape, overall dimensions, hose-port positions, mounting points, cap arrangement, and existing-part photos. Accurate comparison helps wholesalers reduce wrong inventory, installation mismatch, customer claims, and unnecessary international return freight.
| Parameter | Specification |
|---|---|
| YNF Part Number | YNF18818 |
| Part Number | 277-4837 |
| Product Name | Coolant Reservoir |
| Alternative Name | Coolant Sub Tank / Overflow Tank / Expansion Tank / Coolant Recovery Tank |
| Product Type | Auxiliary Engine Cooling Reservoir |
| Parts Category | Excavator / Heavy Equipment Cooling Parts |
| Main Function | Coolant Reserve, Overflow and Recovery Support |
| Application | Compatible Engine Cooling System |
| Installation | Radiator / Cooling Circuit Area |
| Typical Connection | Coolant Overflow or Recovery Hose |
| Material | To Be Confirmed by Product Configuration |
| Fitment Check | Part Number / Tank Shape / Dimensions / Hose Ports / Mounting Points / 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 | Provides auxiliary coolant capacity |
| Radiator Overflow Circuit | Receives displaced coolant according to system design |
| Coolant Recovery | Supports coolant return during cooling where applicable |
| Coolant Reserve | Maintains additional coolant availability in the system |
| Cooling System Repair | Suitable for replacement of cracked or leaking reservoirs |
| Routine Maintenance | Supports convenient coolant-level inspection |
| Machinery Repair Workshop | Suitable for professional cooling-system service |
| B2B Parts Stocking | Practical for dealers, wholesalers, and importers |
Q: What is YNF18818?
A: It is a coolant reservoir / coolant sub tank with reference number 277-4837.
Q: Is 277-4837 the main radiator?
A: No. It is an auxiliary reservoir within the cooling system.
Q: What is the function of the tank?
A: Coolant reserve, overflow, and recovery functions are supported according to the cooling-system design.
YNF Machinery supplies 277-4837 coolant reservoirs and related engine cooling-system parts for excavator repair workshops, machinery dealers, wholesalers, and international importers.
The YNF18818 coolant sub tank is a relatively simple cooling component, but correct hose connections, mounting positions, tank shape, and cap configuration are still important for installation. Similar-looking reservoirs should not automatically be considered interchangeable.
Professional buyers can provide the 277-4837 part number, machine information, required quantity, tank dimensions, hose-port positions, mounting details, and clear photos of the removed tank for fitment confirmation.
Radiators, radiator caps, coolant hoses, thermostats, water pumps, fan blades, and other cooling-system components can also be included in the same inquiry, helping distributors consolidate purchasing and reduce fragmented shipment costs.
