Cylinder Group 217-3991

Wheel Loader Caterpillar 963C

Lift Cylinder Bore 139,70 Stroke 837,00 Hydraulic Cylinder

2173991

Compatible Brand: Caterpillar

Part Number: 217-3991 (2173991)

Superseded / Interchange Numbers: 217-3991, 2173991

Part Name: Track Loader Lift Hydraulic Cylinder Group / Assembly

Technical Specifications: Bore: 139.70 mm / Stroke: 837.00 mm / Weight: Not Specified (Heavy-Duty) / Hydraulic Cylinder

Compatible Machinery: Caterpillar Track Loaders (963C series)

What It Does:

Serves as the primary lift hydraulic actuator mounted on the loader lift arm assembly on Caterpillar 963C series track loaders (crawler loaders). Powered by high-pressure hydraulic fluid, it extends and retracts to raise and lower the loader boom and bucket assembly under heavy payload conditions during excavation and material handling.

Importance:

Critical for defining total lifting capacity, maximum dump clearance height, and operational cycle speed in tough earthmoving, land clearing, and material handling applications. Built with a precision 139.70 mm bore and 837.00 mm stroke heavy-duty structure, it effectively absorbs severe vertical shock loads, dynamic impact forces, and heavy bending stress transmitted through the lift arms, while advanced internal seals prevent fluid bypass under continuous high-pressure operation.

As Seçkin Makine, we manufacture this product as an aftermarket item fully equivalent to the original specifications in terms of raw materials, technical dimensions, and performance characteristics. This product comes with a 1-year warranty from the invoice date.