Cooling Spare Parts

419-03-21320 Coolant Reservoir Tank for Komatsu PC300-8 PC350-8 PC400-8

Q: What numbers are documented for 419-03-21320?

Primary Equipment Part Number: 419-03-21320. Same-number Formatting Variant: 4190321320. Rejected Local Relationship: 20Y-06-15240. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 419-03-21320 before ordering?

Match the complete part number, compare the connector or mounting arrangement with the product photos, and confirm the machine or engine model and serial range. Send clear photos of the original unit when requesting a quote.

419-03-21320 Coolant Reservoir Tank for Komatsu PC300-8 PC350-8 PC400-8, OEM/reference 419-03-21320, Engine Coolant Reserve / Expansion Tank, product view 1

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OEM / reference419-03-21320

SpecificationEngine Coolant Reserve / Expansion Tank

Catalog ID51051229

Engine-coolant reserve/expansion tank identified by Komatsu part number 419-03-21320. The myKomatsu catalog names 419-03-21320 as a radiator tank, while PC300-8MO and PC450LC-8R parts manuals place it in the cooling-system reservoir-tank group. Independent exact-number records support PC300-8/PC300LC-8, PC350-8/PC350LC-8 and PC400-8/PC400LC-8 applications. The five owned photographs show the same molded translucent tank, cap, hose and electrical connector. Confirm the exact number, hose/connector arrangement, mounting points and machine serial before ordering.

Product Type: Engine coolant reserve / expansion tank
System: Radiator and engine cooling
Supplied Form: Molded translucent tank with cap, hose and electrical connector shown
Mounting and Connections: Compare with original tank
Condition: New replacement tank

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Part-number relationships

Relationship	Reference family	Number
Primary Equipment Part Number	Komatsu engine-coolant reservoir tank	419-03-21320
Same-number Formatting Variant	Compact search format	4190321320
Rejected Local Relationship	Separate Komatsu tank number; not an interchange	20Y-06-15240

Product fitment guide

Part numbers and compatible models

Quickly compare the reference number and recorded machine applications. Use the original photos and the checklist before ordering.

Part identification

Reference numbers

Primary number

419-03-21320

Formatting alias

4190321320

Other documented relationship

20Y-06-15240

Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.

Product summary

Engine Coolant Reserve / Expansion Tank

Category: Cooling Spare Parts
Catalog ID: 51051229
Photo views: 5

Before ordering

Confirm these details

Match the complete part number on the original component.
Compare connectors, mounting points and visible dimensions with the product photos.
Confirm the exact machine or engine model and serial range before ordering.

Machine fitment

Compatible model references

5 model references

Cataloged Komatsu excavators: PC300-8 / PC300LC-7E0 / PC300LC-8
Cataloged Komatsu excavators: PC350-8 / PC350LC-8
Cataloged Komatsu excavators: PC400-7E0 / PC400-8 / PC400LC-8 / PC400-8R
Additional parts-manual application: PC450LC-8R; confirm serial range
Fitment limitation: Confirm part number, hose/connector arrangement, mounting and machine serial

Compatibility lists identify searchable model families, not every production serial range. Confirm the original part number and machine serial number before purchase.

Quick fitment answers

Common questions about 419-03-21320

Which machines use 419-03-21320?

Recorded compatible model references include Cataloged Komatsu excavators: PC300-8 / PC300LC-7E0 / PC300LC-8, Cataloged Komatsu excavators: PC350-8 / PC350LC-8, Cataloged Komatsu excavators: PC400-7E0 / PC400-8 / PC400LC-8 / PC400-8R, Additional parts-manual application: PC450LC-8R; confirm serial range, Fitment limitation: Confirm part number, hose/connector arrangement, mounting and machine serial. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 419-03-21320?

Formatting aliases for the same number: 4190321320.

How do I confirm 419-03-21320 before ordering?

Match the complete part number on the original component. Compare connectors, mounting points and visible dimensions with the product photos. Confirm the exact machine or engine model and serial range before ordering. Send clear photos of the original unit and connector layout when requesting a quote.

Continue comparing verified references from the same system.

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