1W7239 Shaft As-Idler Fits Caterpillar Models

One New Aftermarket Replacement Oil Pump Idler Shaft for Caterpillar (Cat) Engines and Equipment

This aftermarket replacement idler shaft (Caterpillar part number 1W7239, also cataloged as 1W-7239) fits within the engine oil pump assembly on a wide range of Caterpillar 3400-series and C-series diesel engines. The idler shaft supports the oil pump drive gear train, ensuring proper lubrication system function across industrial, construction, marine, and power generation applications.

Specifications

• Weight: approximately 2 lbs
• Application: Engine oil pump lubrication system - idler shaft

Compatible Models

Caterpillar Engines: 3406, 3406B, 3406C, 3406E, 3408, 3408B, 3408C, 3412, 3412C, 3412D, 3456, C-15, C-16, C15, C18, G3406, G3408, G3408B, G3408C, G3412, G3412C, CG137-08, CG137-12

Caterpillar Articulated Dump Trucks: 735, 735B, 740, 740B, D350E, D350E II, D400E, D400E II

Caterpillar Challenger: MT835, MT845, MTC835

Caterpillar Motor Graders: 16G, 16H NA, 24M

Caterpillar Scrapers: 621, 621B, 621E, 621F, 621G, 623E, 623F, 623G, 627B, 627E, 627F, 627G, 631D, 631E, 631G, 633E II

Caterpillar Pipelayers: 583T, 587T, PL83, PL87

Caterpillar Landfill Compactors: 826C, 826G, 826G II, 826H, 826K, 836G, 836H, 836K

Caterpillar Load Haul Dump: R2900, R2900G, R3000H

Caterpillar Cold Planers: PM-200, PM-201, PM-465, PM-565, PR-1000, PR-450C, PR-750B

Caterpillar Quarry Trucks: 771C, 775B

Caterpillar Reclaimer/Mixer: RM-250C, RM-350B, RM-500, RR-250, RR-250B

Caterpillar Generator Sets: 3406C, 3406E, 3408C, 3412, 3412C, 3456, C15, C15 I6, C18, C18 I6, G3406, G3412

Replaces Part Number(s):

1W7239, 1W-7239

Aftermarket Interchange Numbers

1W7238, 4N5270, 4N5272, 3790163, M-1W7239, CA1W7239

New aftermarket replacement part - not remanufactured, not used.