3B9378 Oil Seal for Caterpillar Equipment

3B9378 is an oil seal for Caterpillar equipment used in off-road dump trucks, wheel bulldozers, wheel-type loaders, wheeled tractor-scrapers, track loaders, ground compactors for earthwork, articulated dump trucks, and forest machines. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

Fitment

The seal is listed for the following Caterpillar equipment models and machine series:

• Off-road dump truck: 768B, 768C
• Wheel bulldozer: 824C, 834B
• Wheel-type loader: 966G, 972G, 980C, 980G, 980G II, 988B, 992C, 992D
• Wheeled tractor-scraper: 613, 613B
• Track loader: 977A, 977H
• Ground compactor for earthwork: 825C, 826C, 836
• Articulated dump truck: D44B, D550B
• Forest machine: 574

Application data identifies 3B9378 as a seal used across the listed Caterpillar machine series. The equipment type and model should be checked against the machine identification and the seal dimensions before installation, especially where several machine configurations exist within the same series.

Cross-reference numbers

• 3B9378
• 3B-9378

3B9378 and 3B-9378 are the number formats associated with this oil seal. The hyphenated designation is used in the Caterpillar equipment parts reference, while 3B9378 is the SKU and non-hyphenated reference format.

Specifications

The listed dimensions are the shaft diameter, outside diameter, and seal width. The sealing element is made from NBR nitrile material and has a lip-type construction. The part is specified as type SBI for the listed Caterpillar applications.