Head As. 099-0668/173-3351
Excavator Caterpillar 307C, 307D, 311D LRR, 312C, 312C L, 312D, 312D L, 312E, 312E L, 313D, 313D2, 314C, 314D CR, 314D LCR, 314E CR, 314E
Boom Cylinder Bore 110,00 Stroke 1.015,00 Hydraulic Cylinder
0990668/1733351
Compatible Brand: Caterpillar
Part Number: 173-3351 (1733351)
Superseded / Interchange Numbers: 099-0668 (0990668)
Part Name: Excavator Boom Cylinder Head Assembly / Gland Assembly
Technical Specifications: Cylinder Bore Fitment: 110.00 mm / Stroke: 1,015.00 mm / Weight: Not Specified (Heavy-Duty Ductile Iron / Alloy Steel) / Hydraulic Cylinder Head / Gland Component
Compatible Machinery: Caterpillar Compact & Medium Hydraulic Track Excavators (307C, 307D, 311D LRR, 312C, 312C L, 312D, 312D L, 312E, 312E L, 313D, 313D2, 314C, 314D CR, 314D LCR, 314E CR, 314E LCR series)
What It Does:
Serves as the cylinder head (gland assembly) mounted at the front end of the boom lift hydraulic cylinders on Caterpillar 300 series compact and medium hydraulic excavators. It securely closes the front section of the cylinder barrel to contain internal hydraulic fluid pressure while providing precision guiding and alignment for the reciprocating piston rod. Housing rod seals, buffer rings, wiper seals, and wear bands, it maintains high-pressure hydraulic sealing and prevents external contaminants such as dust, dirt, and moisture from penetrating the cylinder.
Importance:
A critical structural and sealing component essential for rod alignment, smooth stroke cycling, and fluid retention during boom lifting and heavy digging operations. Precision-machined to fit a 110.00 mm bore cylinder with high-tensile material properties, it effectively absorbs dynamic shock pulses, side loads, and operational vibrations transmitted through the boom structure, protecting internal seals, minimizing rod scoring, and preventing external oil leakage under demanding site conditions.
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.