Part-number relationships
| Relationship | Reference family | Number |
|---|---|---|
| Primary Part Number | Manufacturer-supported complete tank identity | 502-4178 |
| Related Component Marking - Not Verified Interchange | Visible on owned cap/component only | 251-3227 |
Excavator Spare Parts
502-4178 Expansion Tank for CAT 336 336GC 345GC
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OEM / reference502-4178
SpecificationExpansion Tank
Catalog ID51095721
502-4178 identifies the coolant expansion tank assembly. Manufacturer evidence retains the controlled application list. Owned photographs document a marking on the cap or a related component, but that marking is not a verified interchange for the complete tank and is excluded from SKU and commerce exact-search fields. Confirm the tank number, cap, ports, mounting layout and machine serial configuration before ordering.
- Product Type
- Coolant Expansion Tank Assembly
- Primary Part Number
- 502-4178
- Related Cap Marking
- Documented only in the structured relationship row; not full-tank interchange
- Product Brand
- EexcavaStart
- Condition
- New replacement part
Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.
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
Direct interchange
Formatting aliases are the same number written differently. Related assemblies and remanufactured numbers are not presented as direct interchanges.
Product summary
Expansion Tank
- Category
- Excavator Spare Parts
- Catalog ID
- 51095721
- 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
21 model references
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 502-4178
Which machines use 502-4178?
Recorded compatible model references include Recorded application: 336MHPU, Recorded application: 568, Recorded application: 340, Recorded application: 336 MHPU, Recorded application: 352, Recorded application: 350, Recorded application: 340MHPU, Recorded application: 349 and 13 additional models shown on this page. Confirm the complete part number and machine serial range before ordering.
What numbers are documented for 502-4178?
Documented direct interchanges: 251-3227.
How do I confirm 502-4178 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.
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