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Excavator Spare Parts

488-3790 2-Pin Starter Relay Switch for Cat 320 323 326 336 Excavators

Name: 488-3790 2-Pin Starter Relay Switch for Cat 320 323 326 336 Excavators
Brand: EexcavaStart
SKU: 488-3790

OEM / reference488-3790

SpecificationSolid-State Starter Relay Switch

Catalog ID53103147

Solid-state starter relay switch identified by Cat part number 488-3790. Caterpillar specifies a 2-position Ampseal 16 connector and lists 320, 323, 326, 330 and 336 excavator families. Only the exact rectangular 488-3790 user-owned relay image is retained; five unrelated harness and sensor forms were removed. Confirm connector keying, electrical function and machine serial before ordering.

Fitment status: Verified · Checked 2026-08-02

Product Type: Solid-state starter relay switch
Connector: 2-position Ampseal 16
Material: Aluminum / aluminum alloy housing
Condition: New replacement relay

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Send the machine model, engine model or nameplate photo so our team can confirm compatibility before shipment.

Part-number relationships

Relationship	Reference family	Number
Primary Part Number	Caterpillar starter relay switch	488-3790
Formatted Alias	Same number without separator	4883790
Archived Related Reference - Verify Configuration	Not published as direct interchange	488-3798
Archived Related Reference - Verify Configuration	Not published as direct interchange	488-3799

Fitment data verified. Exact-reference evidence is retained in the protected product audit record · Checked 2026-08-02.

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

488-3790

Formatting alias

4883790

Related assembly

488-3798
488-3799

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

Product summary

Solid-State Starter Relay Switch

Category: Excavator Spare Parts
Catalog ID: 53103147
Photo views: 1

Before ordering

Confirm these details

Confirm voltage and power rating against the original starter nameplate.
Compare mounting-hole pattern, flange position and overall body orientation.
Confirm pinion tooth count and rotation where those values are specified.
Verify the engine model and machine serial range before ordering.

Machine fitment

Compatible model references

3 model references

Verified excavator examples: 320 / 323 / 326 / 330 / 336
Other official examples: M314 / M316 / M318 / M320 / MH3024
Fitment limitation: Confirm connector keying, function 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 488-3790

Which machines use 488-3790?

Recorded compatible model references include Verified excavator examples: 320 / 323 / 326 / 330 / 336, Other official examples: M314 / M316 / M318 / M320 / MH3024, Fitment limitation: Confirm connector keying, function and machine serial. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 488-3790?

Formatting aliases for the same number: 4883790. Related assembly numbers (not direct interchanges): 488-3798, 488-3799.

How do I confirm 488-3790 before ordering?

Confirm voltage and power rating against the original starter nameplate. Compare mounting-hole pattern, flange position and overall body orientation. Confirm pinion tooth count and rotation where those values are specified. 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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