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Cummins 3911559 V-Ribbed Belt Assembly

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Rib Count	8
Effective Belt Length	62.1 in (1577 mm)
Belt Type	Poly-V Serpentine
Cross Section	K-Section
Material	EPDM Rubber / Polyester Cord
Top Width	28.5 mm
Weight	0.45 kg
Package Dimensions	20.32 × 25.4 × 0.64 cm

Manufacturer No.

3911559

OEM Part No.

3911559
3288955
3290185
3901309
3911570

Engine Part No.

Cummins 4B 3.9L
Cummins 6B 5.9L
Cummins 6C 8.3L
Cummins ISB 6.7L
Cummins ISC 8.3L
Cummins ISL 9L
Cummins QSB 6.7L
Cummins QSC 8.3L
Cummins ISD 6.7L
Cummins ISBE
Cummins 6CT

Interchange No.

8PK1570
8PK1580
8PK1582
K080620
K080680
J911559
J903099
CA3911559
FP-3911559
M-3911559
B08-8PK1585
1.21218
PLYV9350
20-2657
20-3945

Fitment Vehicles

Case IH 40XT
Case IH 75XT
Case IH 85XT
Case IH 90XT
Case IH 95XT
Case 1840
Case 1845C
Case 580K
Case 580SK
Case 590
Case 621
Case 680K
Case 680L
Case 750K
Case 780C
Case 780D
Hyundai Wheel Loader
Komatsu Excavator
White Motor Company Truck
AGCO Tractor

This V-ribbed belt serves as a direct replacement for Cummins accessory drive applications across B-Series, C-Series, and ISB/ISC/ISL/QSB/QSC engine platforms. Constructed with EPDM rubber compound and polyester tensile cords, it provides resistance to heat, ozone, weathering, and repeated flexing cycles. The 8-rib K-section profile ensures stable power transmission to alternators, fan drives, and hydraulic pumps in heavy-duty operating environments.

Cross-referenced to Cummins OEM part numbers 3911559, 3288955, 3290185, 3901309, and 3911570. Interchanges with aftermarket designations 8PK1570, 8PK1580, 8PK1582, Gates K080620, Dayco 20-2657, and Interstate McBee M-3911559. Validated for fitment on Case IH tractors, Case Construction loaders, Hyundai wheel loaders, and Komatsu equipment powered by compatible Cummins engines.