1687800 Locknut Fits Caterpillar Models

One New Aftermarket Replacement Locknut for Caterpillar (Cat) Engines and Equipment

This aftermarket replacement locknut (1687800 / 168-7800) is used in the air inlet and exhaust system of Caterpillar diesel engines, serving as a turbocharger mounting locknut and exhaust manifold mounting locknut on 3406-series and C15-series engines. It is also used across a broad range of Caterpillar heavy equipment powered by large displacement Cat engines.

Specifications

• Weight: 0.02 lbs (approx.)
• Application: Turbocharger mounting and exhaust manifold mounting

Compatible Models

Caterpillar Engines: 3406E, 3412, 3412E, 3508, 3508B, 3508C, 3512, 3512B, 3512C, 3516, 3516B, 3516C, C15, C15 Acert, C18

Caterpillar Excavators: 365C, 365C L, 365C L MH, 385C, 385C FS, 385C L, 385C L MH

Caterpillar Scrapers: 631D, 631G, 637D, 637E, 637G, 657E

Caterpillar Mining Shovels: 5130, 5130B, 5230, 5230B

Also fits additional Cat equipment powered by 3406E, C15, 3508, 3512, and 3516-series engines. Verify part number prior to ordering.

Replaces Part Number(s):

1687800, 168-7800

Aftermarket Interchange Numbers

2N2766, 2N-2766, 1681948, 1681948C1, 3E8018, 3E-8018, 340061, 391-2167, 3912167, 4333-1681948C1, 43331681948C1, FP-1687800, FP1687800, FP-2N2766, FP2N2766, M-1687800, M1687800, M-2N2766, M2N2766

New aftermarket replacement part - not remanufactured, not used.