{"id":756,"date":"2026-09-11T06:12:51","date_gmt":"2026-09-11T06:12:51","guid":{"rendered":"https:\/\/zqhydrauliccylinder.com\/?p=756"},"modified":"2026-09-11T06:12:51","modified_gmt":"2026-09-11T06:12:51","slug":"excavator-hydraulic-cylinders-rfq-checklist","status":"publish","type":"post","link":"https:\/\/zqhydrauliccylinder.com\/ar\/excavator-hydraulic-cylinders-rfq-checklist\/","title":{"rendered":"\u0642\u0627\u0626\u0645\u0629 \u0627\u0644\u062a\u062d\u0642\u0642 \u0644\u0637\u0644\u0628 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631 \u0623\u0633\u0637\u0648\u0627\u0646\u0627\u062a \u0627\u0644\u0647\u064a\u062f\u0631\u0648\u0644\u064a\u0643 \u0644\u0644\u062d\u0641\u0627\u0631\u0627\u062a: \u0645\u0627 \u064a\u062c\u0628 \u0639\u0644\u0649 \u0645\u0634\u062a\u0631\u064a \u0627\u0644\u0645\u0639\u062f\u0627\u062a \u0627\u0644\u0623\u0635\u0644\u064a\u0629 \u062a\u062d\u062f\u064a\u062f\u0647"},"content":{"rendered":"<p class=\"wp-block-paragraph\">An excavator hydraulic cylinder RFQ should define the machine, cylinder function, linkage geometry, loads, hydraulic circuit and installation interfaces. A supplier cannot confirm an accurate replacement or OEM design from bore and stroke alone. <a href=\"https:\/\/zqhydrauliccylinder.com\/ar\/\">\u0627\u0644\u0647\u064a\u062f\u0631\u0648\u0644\u064a\u0643\u064a\u0629 \u062a\u0634\u0646\u063a\u062a\u0634\u064a\u0627\u0646\u063a<\/a> uses the complete specification to assess fit, force, rod stability, sealing and manufacturability.<\/p>\n\n\n<p class=\"wp-block-paragraph\">The published excavator cylinder portfolio covers equipment from 1.5 to 700 tons, with a stated range of 50\u2013420 mm bore, 30\u2013260 mm rod diameter, 100\u20133,800 mm stroke, 24.5\u201335 MPa working pressure, pull force up to 2,000 kN and operating temperature from \u221240 to 100 \u00b0C. These figures show manufacturing coverage only. The final design must come from the actual excavator and cylinder duty.<\/p>\n\n\n<h2 class=\"wp-block-heading\">1. Identify the excavator and cylinder position<\/h2>\n\n\n<p class=\"wp-block-paragraph\">Start with the equipment manufacturer, model, operating weight, serial range and machine revision. Identify the cylinder as boom, arm or dipper, bucket, swing or track-tension. Each position has a different geometry and load history. State whether the project is a new OEM design, a controlled replacement, an aftermarket interchange or reverse engineering of a used cylinder.<\/p>\n\n\n<ul class=\"wp-block-list\"><li>Machine manufacturer, model, serial range and configuration.<\/li>\n<li>Cylinder function and installation position.<\/li>\n<li>OEM part number and controlled drawing revision.<\/li>\n<li>Attachments that change the load, such as long-reach boom or heavy bucket.<\/li>\n<li>Prototype, replacement and expected production quantity.<\/li><\/ul>\n\n\n<h2 class=\"wp-block-heading\">2. Provide a complete interface drawing<\/h2>\n\n\n<p class=\"wp-block-paragraph\">Use a consistent datum system and show retracted length, extended length and effective stroke. Include both end mounts, pin diameters, bearing widths, grease passages, port size and orientation, barrel envelope and clearance around the linkage. For a replacement, record whether the old cylinder has been repaired or modified.<\/p>\n\n\n<ul class=\"wp-block-list\"><li>Bore and rod diameter with known tolerances.<\/li>\n<li>Stroke, pin-center closed length and pin-center open length.<\/li>\n<li>Rod-end and cap-end mount dimensions.<\/li>\n<li>Pin, bushing, spherical bearing and lubrication details.<\/li>\n<li>Port thread, orientation and hose-clearance requirements.<\/li>\n<li>Sensor, cushioning, valve block or protective-guard interfaces.<\/li><\/ul>\n\n\n<h2 class=\"wp-block-heading\">3. Supply linkage loads, not only machine tonnage<\/h2>\n\n\n<p class=\"wp-block-paragraph\">Required cylinder force depends on linkage leverage and the load at the working attachment. Provide the critical boom, arm or bucket angle, external load, center of gravity and the calculated cylinder force at the pin. The worst condition may occur where the moment arm is shortest, not where the attachment appears most heavily loaded.<\/p>\n\n\n<p class=\"wp-block-paragraph\">For a long boom or arm cylinder, provide maximum compression load, unsupported rod length and end conditions for a buckling review. Side load and misalignment should be corrected through geometry and bearing control rather than hidden by selecting a larger rod without analysis.<\/p>\n\n\n<h2 class=\"wp-block-heading\">4. Define the hydraulic operating envelope<\/h2>\n\n\n<p class=\"wp-block-paragraph\">State normal working pressure, relief pressure, known transient peaks, pump flow and desired extension and retraction times. Include hydraulic fluid, viscosity range, filtration target and the circuit diagram when available. If load holding, regeneration, cushioning or shock relief affects the cylinder, describe the relevant valve logic.<\/p>\n\n\n<ul class=\"wp-block-list\"><li>Normal pressure, relief setting and peak event.<\/li>\n<li>Required push and pull force at critical linkage positions.<\/li>\n<li>Extension\/retraction time and available flow.<\/li>\n<li>Fluid type, viscosity and contamination control.<\/li>\n<li>Load-holding, regeneration, cushioning and valve interfaces.<\/li>\n<li>Allowable internal leakage, external leakage or drift.<\/li><\/ul>\n\n\n<h2 class=\"wp-block-heading\">5. Describe the real digging duty<\/h2>\n\n\n<p class=\"wp-block-paragraph\">Record the attachment, material handled, cycle frequency, hours per day and the proportion of high-load work. Rock breaking, demolition, mining, loading and general earthmoving create different shock and contamination conditions. State whether the machine works continuously, experiences frequent impact or spends long periods with the cylinder extended.<\/p>\n\n\n<h2 class=\"wp-block-heading\">6. Record environment and surface-protection needs<\/h2>\n\n\n<p class=\"wp-block-paragraph\">Provide ambient and fluid temperature, dust, mud, water, abrasive material, salt or chemical exposure, storage conditions and cleaning method. The listed \u221240 to 100 \u00b0C portfolio range still requires project-specific confirmation of seals, hydraulic fluid, rod surface and corrosion protection.<\/p>\n\n\n<p class=\"wp-block-paragraph\">For a failed replacement cylinder, include photographs and inspection findings for rod scoring, corrosion, bent rod, damaged bearings, seal extrusion, external leakage, drift or contamination. Failure evidence can reveal a machine alignment or hydraulic-system problem that a dimensionally identical cylinder would not solve.<\/p>\n\n\n<h2 class=\"wp-block-heading\">7. Define material, sealing and service expectations<\/h2>\n\n\n<p class=\"wp-block-paragraph\">If the project requires a specific steel grade, rod treatment, coating, seal material or bearing system, state the requirement and its reason. Otherwise, provide the pressure, fluid, temperature, contamination, load and service-life target so the supplier can propose a suitable configuration. Also state whether seal kits, bushings or other service parts must remain available.<\/p>\n\n\n<h2 class=\"wp-block-heading\">8. Specify inspection, testing and documentation<\/h2>\n\n\n<p class=\"wp-block-paragraph\">List the critical dimensions and acceptance criteria. Define pressure-test conditions, external-leakage inspection, functional cycling, internal-leakage or drift limits when relevant, coating inspection and required records. For an interchange project, specify the fit and functional checks that must be completed on the machine before series approval.<\/p>\n\n\n<ul class=\"wp-block-list\"><li>Drawing approval and revision control.<\/li>\n<li>Critical-dimension inspection report.<\/li>\n<li>Pressure and functional test criteria.<\/li>\n<li>Leakage, drift and motion-smoothness acceptance limits.<\/li>\n<li>Material, coating and traceability documentation.<\/li>\n<li>Identification, packing and corrosion protection.<\/li><\/ul>\n\n\n<h2 class=\"wp-block-heading\">9. Add commercial and program information<\/h2>\n\n\n<p class=\"wp-block-paragraph\">State prototype quantity, validation plan, production volume, target delivery, destination, Incoterm and packaging constraints. Clarify whether the supplier is quoting a build-to-print component, a reverse-engineered replacement or an engineering collaboration. These scopes require different data, review time and responsibility.<\/p>\n\n\n<h2 class=\"wp-block-heading\">Excavator cylinder RFQ checklist<\/h2>\n\n\n<ul class=\"wp-block-list\"><li>Machine model, configuration, cylinder position and OEM part number confirmed.<\/li>\n<li>Controlled drawing or complete measured dimensions attached.<\/li>\n<li>Bore, rod, stroke, closed length and open length identified.<\/li>\n<li>Mounts, pins, bearings, ports and clearances defined.<\/li>\n<li>Critical linkage geometry and required force calculation supplied.<\/li>\n<li>Pressure, flow, speed, valve logic and fluid stated.<\/li>\n<li>Compression length, buckling, side load and alignment conditions recorded.<\/li>\n<li>Attachment, material, cycle rate, impact and environment described.<\/li>\n<li>Inspection, test, documentation and interchange criteria listed.<\/li>\n<li>Prototype, production quantity, schedule, destination and packaging included.<\/li><\/ul>\n\n\n<h2 class=\"wp-block-heading\">Common RFQ mistakes<\/h2>\n\n\n<ul class=\"wp-block-list\"><li>Selecting by excavator tonnage without the cylinder position and linkage data.<\/li>\n<li>Providing bore and stroke but omitting closed length and mount dimensions.<\/li>\n<li>Measuring a worn pin or repaired cylinder as though it were the original datum.<\/li>\n<li>Using relief pressure as a continuous operating pressure.<\/li>\n<li>Ignoring rod buckling, bearing wear and side loading.<\/li>\n<li>Copying specifications from a similar excavator model.<\/li>\n<li>Requesting an identical replacement without reporting the original failure evidence.<\/li><\/ul>\n\n\n<div class=\"wp-block-group has-background\" style=\"background-color:#f5f6f8;margin-top:48px;padding-top:32px;padding-right:32px;padding-bottom:32px;padding-left:32px\"><div class=\"wp-block-group__inner-container is-layout-constrained wp-container-core-group-is-layout-9bde12cf wp-block-group-is-layout-constrained\">\n\n<h2 class=\"wp-block-heading\">\u0625\u0631\u0633\u0627\u0644 \u0637\u0644\u0628 \u0639\u0631\u0636 \u0623\u0633\u0639\u0627\u0631 \u0643\u0627\u0645\u0644 \u0644\u0644\u0645\u0631\u0627\u062c\u0639\u0629 \u0627\u0644\u0647\u0646\u062f\u0633\u064a\u0629<\/h2>\n\n\n<p class=\"wp-block-paragraph\">A useful quotation starts with verified machine, interface and duty data. Attach the controlled drawing when available, identify every unknown clearly and state how the cylinder will be accepted after production.<\/p>\n\n\n<div class=\"wp-block-buttons is-layout-flex wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-text-color has-background wp-element-button\" href=\"https:\/\/zqhydrauliccylinder.com\/ar\/%d8%a7%d8%aa%d8%b5%d9%84-%d8%a8%d9%86%d8%a7\/\" style=\"color:#ffffff;background-color:#c2410c\">\u0637\u0644\u0628 \u0639\u0631\u0636 \u0633\u0639\u0631 \u062a\u0642\u0646\u064a<\/a><\/div>\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-text-color has-background wp-element-button\" href=\"https:\/\/zqhydrauliccylinder.com\/ar\/%d8%a7%d9%84%d9%85%d9%86%d8%aa%d8%ac%d8%a7%d8%aa\/%d8%a3%d8%b3%d8%b7%d9%88%d8%a7%d9%86%d8%a7%d8%aa-%d9%87%d9%8a%d8%af%d8%b1%d9%88%d9%84%d9%8a%d9%83%d9%8a%d8%a9-%d9%84%d9%84%d8%ad%d9%81%d8%a7%d8%b1%d8%a7%d8%aa\/\" style=\"color:#ffffff;background-color:#13204a\">\u0639\u0631\u0636 \u0645\u0648\u0627\u0635\u0641\u0627\u062a \u0627\u0644\u0645\u0646\u062a\u062c<\/a><\/div>\n<\/div>\n\n<\/div><\/div>","protected":false},"excerpt":{"rendered":"<p>\u0627\u0633\u062a\u062e\u062f\u0645 \u0642\u0627\u0626\u0645\u0629 \u0627\u0644\u062a\u062d\u0642\u0642 \u0644\u0637\u0644\u0628 \u0639\u0631\u0636 \u0627\u0644\u0623\u0633\u0639\u0627\u0631 \u0627\u0644\u062e\u0627\u0635 \u0628\u0627\u0644\u0623\u0633\u0637\u0648\u0627\u0646\u0629 \u0627\u0644\u0647\u064a\u062f\u0631\u0648\u0644\u064a\u0643\u064a\u0629 \u0644\u0644\u062d\u0641\u0627\u0631 \u0644\u062a\u062d\u062f\u064a\u062f \u0628\u064a\u0627\u0646\u0627\u062a \u0627\u0644\u0622\u0644\u0629\u060c \u0648\u0627\u0644\u0647\u0646\u062f\u0633\u0629\u060c \u0648\u0627\u0644\u0623\u062d\u0645\u0627\u0644\u060c \u0648\u0627\u0644\u0636\u063a\u0637\u060c \u0648\u0627\u0642\u062a\u0631\u0627\u0646 \u0627\u0644\u0648\u0627\u062c\u0647\u0627\u062a\u060c \u0648\u0627\u062e\u062a\u0628\u0627\u0631 \u0645\u062a\u0637\u0644\u0628\u0627\u062a \u0627\u0644\u062a\u0648\u0631\u064a\u062f.<\/p>","protected":false},"author":1,"featured_media":594,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[18],"tags":[],"class_list":["post-756","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-selection-sizing"],"acf":[],"_links":{"self":[{"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/posts\/756","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/comments?post=756"}],"version-history":[{"count":1,"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/posts\/756\/revisions"}],"predecessor-version":[{"id":759,"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/posts\/756\/revisions\/759"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/media\/594"}],"wp:attachment":[{"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/media?parent=756"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/categories?post=756"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zqhydrauliccylinder.com\/ar\/wp-json\/wp\/v2\/tags?post=756"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}