4N9975 Fuel Injection Pump for Caterpillar Equipment

The 4N9975 fuel injection pump is used in fuel system applications for Caterpillar equipment and engines. The compatible equipment includes Caterpillar autograders, the 16G motor grader, 621B and 623B wheeled tractor-scrapers, 3406 truck and industrial engines, 3406 ship equipment, the 245 excavator, and SR4 engine-generator sets. This is a new aftermarket part manufactured by CTP (Costex Tractor Parts).

The part is listed under the Caterpillar equipment applications shown below. Fitment should be checked against the machine model, engine configuration, and the identification number marked on the removed component before installation.

Fitment

• Caterpillar Autograder — fuel injection system application.
• Caterpillar 16G — motor grader application.
• Caterpillar 621B — wheeled tractor-scraper application.
• Caterpillar 623B — wheeled tractor-scraper application.
• Caterpillar 3406 Truck Engine — fuel injection system application.
• Caterpillar 3406 Industrial Engine — fuel injection system application.
• Caterpillar 3406 Ship Equipment — fuel injection system application.
• Caterpillar 245 Excavator — fuel injection system application.
• Caterpillar SR4 Engine-Generator Set — fuel injection system application.

Cross-reference numbers

The component is identified by the unhyphenated SKU 4N9975 and the hyphenated number 4N-9975. These designations refer to the same part number shown for this fuel injection pump application.

• 4N9975 — SKU and unhyphenated part number.
• 4N-9975 — hyphenated part number designation.

Specifications

The listed applications cover several Caterpillar machine and engine groups rather than one single equipment type. The 3406 designation is included for truck, industrial, and ship equipment applications, while the SR4 designation identifies the engine-generator set application. The 621B and 623B models are listed as wheeled tractor-scrapers, and the 16G model is listed as an autograder application.

Dimensional data is provided in both inch and metric listings where available. The listed measurements are height 2.1 inches, length 12 inches, weight 0.6 lb, length 34 cm, width 19 cm, and depth 6 cm. No additional installation hardware, seals, fittings, or other components are specified as included with the pump.