Concrete Pump Hydraulic Cylinder Leakage RFQ Checklist: Data Buyers Must Provide

Concrete Pump Hydraulic Cylinder Leakage RFQ Checklist: Data Buyers Must Provide is a machine-level engineering question, not a parts-only judgment. The observed leakage can originate in the cylinder, hydraulic circuit, mounting geometry, contamination, operating conditions or a combination of these factors. A reliable decision starts by making the machine safe, preserving evidence and comparing the complete duty with verified cylinder data.

The corresponding product record covers concrete pump hydraulic cylinders. The published values below define a manufacturing envelope for the product family; they do not prove that one bore, rod, stroke or pressure configuration fits every machine. Final repair or replacement data must be tied to the machine model, cylinder function, controlled drawing and load case.

Published product-library range

Published field	Verified product-library value
Bore	80‑360 mm
Diâmetro da haste	55‑220 mm
Acidente Vascular Cerebral	150‑2450 mm
Pressão de trabalho	22‑45 MPa
Published thrust limit	≤ 4065 kN
Published pull-force limit	≤ 2549 kN
Operating temperature	‑40‑100 ℃
Published application range	23‑75m Concrete Pump Truck

Start with the cylinder function, not the symptom alone

Identify whether the cylinder raises, positions, stabilizes, steers, folds, supports or reciprocates a machine component. The same visible symptom can have different consequences and causes in a load-holding cylinder, a high-cycle pumping cylinder and an attachment-positioning cylinder. Record the cylinder position and function before inspection.

What leakage can indicate

Observation	Possible explanation	Next evidence to collect
Oil at the rod or gland	Rod scoring, seal damage, contamination, side load or pressure peaks	Clean and locate the origin; inspect rod surface and alignment before replacing seals
Oil at a port or fitting	Loose connection, damaged thread, hose load or sealing-surface damage	Depressurize safely and inspect the complete connection
Drift without external oil	Piston-seal bypass, valve leakage, thermal effects or another circuit path	Use an approved isolation test; do not condemn the cylinder from drift alone
Repeated leakage after repair	Uncorrected rod, bore, bearing, alignment, fluid or pressure problem	Perform root-cause inspection before another seal replacement

Machine and cylinder identification for the RFQ

• Machine manufacturer, model, serial range and operating region.
• Cylinder function and position on the machine.
• Existing part number, drawing number and revision when available.
• Whether the request is an OEM program, fleet replacement, repair reference or one-off reverse-engineering project.

Geometry and interface data

• Retracted and extended pin-to-pin dimensions and effective stroke.
• Bore and rod diameter only when measured reliably.
• Mounting-end type, pin diameter, lug width, clevis gap, bearing details and grease provisions.
• Port thread, size, position and orientation, plus any manifold or integrated valve.
• Installation envelope, interference points and hose-routing restrictions.

Duty, symptom and inspection data

• Normal and peak pressure, required push/pull force, travel speed and duty cycle.
• Load direction, load-holding requirement and acceptable drift or leakage limit.
• Hydraulic fluid, temperature, contamination, water, dust, mud and corrosion exposure.
• Location, pattern and operating conditions associated with the observed leakage.
• Photographs, dimensional reports, pressure records and the history of previous repairs.

Acceptance and commercial requirements

• Required design review, drawing approval and deviation process.
• Pressure, leakage, hold, stroke, dimensional and coating tests.
• Material, heat-treatment, surface-finish and traceability documents when required.
• Prototype quantity, annual demand, packaging, destination and target delivery date.

A useful quotation clearly separates confirmed buyer inputs, supplier selections and open questions. Missing geometry or duty data should remain open for confirmation; it should never be replaced with a value copied from another machine.

Engineering checks before returning the cylinder to service

• Confirm that the failure cause has been identified or clearly bounded.
• Verify mounting alignment, pins, bushings and adjacent structures before installation.
• Confirm fluid, seals, surface condition, ports and load-control components are compatible with the duty.
• Complete the specified dimensional, stroke, pressure, leakage and hold tests.
• Record the cylinder identity, repair or drawing revision, test results and installation date.

Information package for engineering review

A concise evidence package reduces quotation delays and prevents assumptions. Include the machine model and serial range, cylinder function, drawing or complete measurements, normal and peak pressure, force and speed requirements, duty cycle, environmental conditions, symptom history, photographs, inspection measurements, required documentation, quantity and delivery destination.

Frequently asked questions

Does visible leakage prove the cylinder is defective?

No. It proves that a condition requires investigation. The control valve, load-control valve, hose, fitting, mounting, contamination, thermal change or adjacent structure may contribute. Diagnosis should isolate the cylinder from other system paths.

Can a replacement be selected from bore and stroke alone?

No. Interchangeability also depends on retracted and extended length, rod diameter, mounts, pins, ports, pressure, force, speed, stability, seals, environment, load holding and acceptance tests.

Should a repair shop reuse the previous cylinder dimensions?

Only when those dimensions come from a controlled drawing or a verified measurement process. A previously modified or damaged cylinder may not represent the original interface.

What should remain open when data is missing?

Keep the unknown value open for confirmation. Do not borrow pressure, force, temperature, material or geometry values from a different cylinder family or machine.

For company capabilities and related cylinder families, visit Zhenqiang Hydraulic. Review the verified Concrete Pump Hydraulic Cylinders product information before sending the inspection and machine data.