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Cummins 3926861 Poly V-Belt

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Belt Type	Poly V-Belt (Serpentine)
Rib Count	8 Ribs
Belt Profile	PK
Effective Length	1840 mm
Top Width	18.5 mm
Construction Material	EPDM with Aramid Tensile Cord
Applications	Fan and Accessory Drive
Net Weight	1.1 kg
Package Dimensions	28 × 28 × 6 cm

Manufacturer No.

3926861

OEM Part No.

3926861

Engine Part No.

Cummins 6C8.3
Cummins QSC8.3
Cummins ISC8.3
Cummins QSL8.3

Interchange No.

DAY8PK1840HD
8PK1840ES
3289503
L3926861

Fitment Vehicles

Cummins Generator Sets
Shantui SD16 Bulldozer
Peterbilt Trucks

The Cummins 3926861 is an 8-rib poly V-belt designed for the accessory drive system on Cummins 6C8.3 and QSC8.3 series diesel engines. It transmits rotational power from the crankshaft to the cooling fan, alternator, and water pump.

Constructed from high-modulus EPDM rubber compound with aramid tensile cords, the belt resists heat, ozone, and abrasion in heavy-duty cycles. The 8PK profile ensures high power density and stable tracking on multi-groove pulleys. Effective length is 1840 mm per the 8PK1840 industry designation. Direct OEM replacement for Cummins part number 3926861, cross-referenced to Dayco DAY8PK1840HD, Gates 8PK1840ES, and Continental 3289503.