4N4366 Spring for Caterpillar Equipment

The 4N4366 spring is a steel compression spring used in air starter motor applications on Caterpillar equipment. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

Fitment

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

• Wheel skidders: 518, 528
• Wheeled bulldozer: 814
• Wheel-type loaders: 920, 930, 930R, 930T, 950, 966C, 980B
• Dumper engines: 3306, 1673C
• Soil compactors: 815, 816
• Track-type tractors: 4, 4A, 5, 55, 5A, 5S, 6, D7G, 6A, 6S, D4D, D4E, D5, 140, 141, 143, 153, 163, D5B, D6C, D6D, D7F
• Autograders: 120, 120B, 120G, 12F, 12G, 130G, 140, 140B, 140G, 14E, 14G
• Wheel tractor-scrapers: 627, 627B, 637, 637B, 637D, 639D
• Construction equipment with D333C and 3306 engines: D333C, 3306
• Industrial engines: 3306, D333C, 1673C
• Pipe layers: 561C, 561D, 571F, 571G, 572F, 572G
• Track loaders: 941, 941B, 951, 951B, 951C, 955, 955K, 955L, 977, 977K, 977L
• Excavators: 215, 225, 235
• Generator set engine: SR4

Fitment should be checked by comparing the equipment model and the spring dimensions with the part installed in the air starter motor assembly.

Specifications