8J1688 O-Ring for Caterpillar Equipment

8J1688 is a standard O-ring used as an axial or radial seal in Caterpillar earthmoving compactors and Caterpillar engine-machine applications. The seal is intended to help prevent leakage and contamination at the mating surfaces of compatible assemblies. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

Fitment

The O-ring is listed for the following Caterpillar equipment and engine models:

• Caterpillar 836G earthmoving compactor
• Caterpillar 836H earthmoving compactor
• Caterpillar 3116 engine-machine application
• Caterpillar 3126B engine-machine application
• Caterpillar 3306 engine-machine application
• Caterpillar 3406 engine-machine application
• Caterpillar 3406C engine-machine application
• Caterpillar 3408 engine-machine application
• Caterpillar 3408C engine-machine application
• Caterpillar 3408E engine-machine application

Compatibility should be checked against the equipment model, serial-number range, seal dimensions and the part number removed from the assembly before installation. The listed application identifies the Caterpillar equipment associated with the part; it does not indicate that the O-ring is manufactured by Caterpillar.

Cross-reference numbers

• 8J-1688
• 8J1688
• SAE AS568 dash size: -354

8J1688 and 8J-1688 are number formats associated with the same part designation. The SAE AS568 designation identifies the size classification of the O-ring.

Specifications

The stated dimensions are the supplied dimensional specifications for this part: 5.1 in inner diameter, 5.52 in outside diameter and 0.21 in cross-section diameter. The 75 Shore A hardness and NBR material designation describe the sealing ring material. Before fitting, the sealing groove and mating surfaces should be checked for damage, contamination and dimensional conformity.