4J0121 Engine Oil Filler Cap for Caterpillar Equipment

The 4J0121 is an engine oil filler cap used on Caterpillar equipment. It is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The cap is listed for Caterpillar bulldozers, loggers, soil compactors, track skidders, track-type tractors, and wheel dozers. The compatible equipment models are grouped below by machine type.

Fitment

• Bulldozers: Caterpillar 3S, 814S, 824S.
• Logger: Caterpillar 227.
• Soil compactors: Caterpillar 815B, 815F, 815F II, 825C.
• Track skidder: Caterpillar 527.
• Track-type tractors: Caterpillar D3B, D4H, D4H XL, D5H, D5H XL, D5R LGP, D6H, D6H II, D6H XL, D6H XR, D6M, D6N, D6N LGP, D6R, D6R II, D6R III, D6R STD, D6T, D6T LGP, D6T XL.
• Wheel dozers: Caterpillar 814B, 814F, 814F II, 824B, 834.

Specifications