Excavator Engine Parts

3918944 / APV2970 Belt Tensioner for Cummins 4BTA 6BTA 6CT

Q: What numbers are documented for 3918944?

Primary Cummins Part Number: 3918944. Aftermarket Manufacturer Number: APV2970. Published Replacement Number: 3922900. Published Replacement Number: 3978022. Relationship labels distinguish formatting aliases, direct interchanges, remanufactured references and related assemblies.

Q: How do I confirm 3918944 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.

3918944 / APV2970 Belt Tensioner for Cummins 4BTA 6BTA 6CT, OEM/reference 3918944, Accessory Belt Tensioner, product view 1

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OEM / reference3918944

SpecificationAccessory Belt Tensioner

Catalog ID51049925

Mechanical accessory-belt tensioner identified by Cummins 3918944 and aftermarket reference APV2970. Published cross-reference catalogues cover Cummins 4BTA, 6B/6BTA and 6CT engine families, with additional Case applications. The old 24V statement was removed because a spring-loaded mechanical tensioner has no electrical voltage rating.

Product Type: Accessory Belt Tensioner
Product Brand: EexcavaStart
Operation: Spring-loaded mechanical tensioner
Electrical Rating: Not applicable
Condition: New replacement part

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Part-number relationships

Relationship	Reference family	Number
Primary Cummins Part Number	Accessory-belt tensioner	3918944
Aftermarket Manufacturer Number	Published Dayco tensioner reference	APV2970
Published Replacement Number	Cummins tensioner cross-reference	3922900
Published Replacement Number	Cummins tensioner cross-reference	3978022

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

3918944

Manufacturer number

APV2970

Other documented relationship

3922900
3978022

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

Product summary

Accessory Belt Tensioner

Category: Excavator Engine Parts
Catalog ID: 51049925
Photo views: 4

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

2 model references

Published engine families: Cummins 4BTA / 6B / 6BTA / 6CT
Fitment limitation: Confirm engine serial, pulley width and mounting geometry

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 3918944

Which machines use 3918944?

Recorded compatible model references include Published engine families: Cummins 4BTA / 6B / 6BTA / 6CT, Fitment limitation: Confirm engine serial, pulley width and mounting geometry. Confirm the complete part number and machine serial range before ordering.

What numbers are documented for 3918944?

Manufacturer number: APV2970.

How do I confirm 3918944 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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