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Excavator Spare Parts

21W-60-42120 Solenoid for Komatsu PC78 PC128 PC138

Name: 21W-60-42120 Solenoid for Komatsu PC78 PC128 PC138
Brand: EexcavaStart
SKU: 21W-60-42120

OEM / reference21W-60-42120

SpecificationThreaded Excavator Solenoid Assembly

Catalog ID82535784

Solenoid assembly identified by part number 21W-60-42120 for selected Komatsu excavator and crawler-carrier circuits. Parts-catalog records list PC78MR-6, PC78US-6, PC78UU-6, PC128US-2, PC128UU-2, PC138US-2 and CD110R-2 applications. Its assigned function varies by machine and serial range, including blade, arm-crane bucket and general solenoid-valve circuits; confirm the machine serial number and connector before ordering.

Fitment status: Verified · Checked 2026-07-28

Product Type: Excavator Solenoid Assembly
Product Brand: EexcavaStart
Body Style: Threaded cylindrical solenoid
Electrical Connection: Two-wire plug lead
Condition: New replacement part

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Part-number relationships

Relationship	Reference family	Number
Primary Manufacturer Part Number	Solenoid assembly	21W-60-42120
Formatted Alias	Same number without separators	21W6042120

Evidence record

Source: Exact-reference evidence retained for internal audit
Evidence grade: multi-source-supported
Checked: 2026-07-28

Source URLs, catalog files and local evidence paths are stored in the protected product audit record and are not public outbound links.

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

21W-60-42120

Formatting alias

21W6042120

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

Product summary

Threaded Excavator Solenoid Assembly

Category: Excavator Spare Parts
Catalog ID: 82535784
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

3 model references

Excavators: Komatsu PC78MR-6 / PC78US-6 / PC78UU-6 / PC128US-2 / PC128US-2-AC / PC128UU-2 / PC138US-2 / PC138US-2-AC
Crawler carrier: Komatsu CD110R-2
Fitment limitation: Confirm serial range, valve-circuit position, thread and connector

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 21W-60-42120

Which machines use 21W-60-42120?

Recorded compatible model references include Excavators: Komatsu PC78MR-6 / PC78US-6 / PC78UU-6 / PC128US-2 / PC128US-2-AC / PC128UU-2 / PC138US-2 / PC138US-2-AC, Crawler carrier: Komatsu CD110R-2, Fitment limitation: Confirm serial range, valve-circuit position, thread and connector. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 21W-60-42120?

Formatting aliases for the same number: 21W6042120.

How do I confirm 21W-60-42120 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 recovered references from the same system.

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