Custom Excavator Hydraulic Cylinders

Custom Excavator Hydraulic Cylinders

Excavator boom, arm and bucket cylinders work through different load directions and motion ranges. Yongjian can review a new equipment design or replacement request from machine drawings and duty information, then develop a project-specific cylinder configuration for approval. Each position should be evaluated separately: the boom carries and controls the front attachment, the arm governs reach and digging motion, and the bucket cylinder works through a changing linkage ratio.

Concept rendering for application illustration. Final appearance, dimensions and performance depend on the approved drawing and duty specification.

Applications and design review

For a new design, provide the machine model, linkage drawing, pin-center positions at both end stops, load cases and the hydraulic schematic. For a replacement, include the original cylinder drawing or measured bore, rod, stroke, closed and extended lengths, mount dimensions, port locations and clear photos. The engineering review should check force in both directions, rod stability under compression, mounting alignment, available installation space and collision clearances through the full travel.

Configuration choices

Bore, piston rod diameter, stroke, mounting ends, pin and bushing details, port thread and orientation are set to the machine interface. Depending on the duty, the specification may also address cushioning near the end of travel, rod surface protection, wiper and seal selection, temperature range and hydraulic fluid compatibility. Seal and wear-part choices should reflect contamination, cycle frequency and maintenance conditions at the worksite. Any position sensing or special coating requirement should appear on the approved drawing.

Inspection and project documents

Agree on critical dimensions, pressure and leakage checks, motion checks, marking, paint or surface protection, preservation and packing before manufacture. The final test pressure and acceptance limits must come from the approved specification. For fleet replacement projects, define whether interchangeability with an existing cylinder is required and identify any revision differences in the machine population.

Information for a quotation

Send machine and cylinder drawings, boom/arm/bucket position, required force or load cases, operating and peak pressure, stroke, pin interfaces, fluid, working temperature, duty cycle, quantity and required inspection records. Yongjian also lists crane hydraulic cylinders for other mobile equipment. Contact us with your drawings for an engineering review and quotation.