Description
The Eaton Fuller Mainshaft Key Assembly, part number A-3990 or A3990, is a manual transmission main shaft key with pin designed for Eaton Fuller gearboxes. This key measures 7.5 inches in length, 0.1875 inches wide, and 0.125 inches in height. It is sold individually (each) and sourced directly from Eaton Fuller. Cross-reference numbers include S-5027 or S5027, A3990-SP or A3990SP, and HF part number HFA-3990, among others. Pro Gear and Transmission carries this part for fleet shops and drivetrain specialists who need an exact OEM fit. Call us to confirm the correct application for your specific transmission model.
Features
Eaton Fuller OEM mainshaft key with pin for manual transmissions
Part number A-3990 or A3990; also cross-references HFA-3990, S-5027 or S5027, and A3990-SP or A3990SP
Dimensions: 7.5 in. length x 0.1875 in. width x 0.125 in. height
Sold individually as a single replacement key
Fits Eaton Fuller manual transmission applications requiring mainshaft key service
Tech Specs
- Part Number: A-3990 or A3990
- Part Type: Mainshaft Key with Pin
- Length: 7.5 in.
- Width: 0.1875 in.
- Height: 0.125 in.
- Unit of Measure: Each
- Cross References: S-5027 or S5027, A3990-SP or A3990SP, HFA-3990, 35530494, 674652
Used in these Eaton Fuller model
- RT-6613
