{"id":20229,"date":"2026-02-02T08:53:27","date_gmt":"2026-02-02T07:53:27","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=20229"},"modified":"2026-06-22T17:11:03","modified_gmt":"2026-06-22T15:11:03","slug":"overhaul-program","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/overhaul-program","title":{"rendered":"Overhaul program"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>An <strong>overhaul program<\/strong> is a central building block for the safe, cost-effective, and sustainable use of hydraulic demolition and cutting technology. It describes the systematic, plannable refurbishment of tools and hydraulic power packs over their entire life cycle. Especially in application areas such as <em>concrete demolition and special demolition<\/em>, <em>building gutting and concrete cutting<\/em>, <em>rock excavation and tunnel construction<\/em>, <em>natural stone extraction<\/em> as well as in <em>special demolition<\/em>, the quality of the overhaul determines availability, performance, and occupational safety. Tools from Darda GmbH- such as <strong>concrete demolition shears<\/strong> and <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">rock and concrete splitters<\/a>, but also hydraulic power packs, combination shears, rock wedge splitters, Multi Cutters, steel shears, and tank cutters- benefit from clearly defined overhaul standards, because the loads in practice are high and tolerances are tight. Properly executed <em>reconditioning<\/em> and <em>remanufacturing<\/em> stabilize performance, extend service life, and support compliance across demanding duty cycles.<\/p>\n<h2>Definition: What is meant by an overhaul program?<\/h2>\n<p>An overhaul program is understood as the scheduled, documented restoration of the functionality of a tool or system to its intended condition. This includes diagnosis, disassembly, cleaning, measurement, replacement of wear parts, assembly, and final testing. The overhaul program is distinct from maintenance (care, lubrication, adjustment) and inspection (condition assessment) by specifically renewing <em>worn, damaged, or aged components<\/em>. The aim is stable performance, reduced probability of failure, and compliance with safety-relevant requirements. For hydraulic demolition tools this typically includes seals, guides, pins and bushings, cutting jaws or splitting wedges, valves, hydraulic hose lines, as well as the hydraulic accumulator, supplemented by a functional and pressure test at the end. In practice, the term also covers structured <em>reconditioning<\/em> measures that return a component to specification with traceable documentation.<\/p>\n<h2>Objectives and benefits in concrete demolition and special demolition<\/h2>\n<p>A structured overhaul program stabilizes <strong>machine availability<\/strong>, reduces unplanned downtime, and contributes to <strong>operational safety<\/strong>. Especially <em>concrete demolition shears<\/em> need their nominal cutting force and precise jaw clearance to reliably cut reinforcement. <em>Stone and concrete splitters<\/em> only deliver their full splitting force when cylinders, sealing systems, and wedges are mechanically and hydraulically within specification. In noise-sensitive or vibration-critical areas- typical for special demolition or underground- a plannable overhaul cycle minimizes risks and simplifies deployment logistics. Economically, life-cycle costs decrease because core components are preserved and wear parts are renewed in a targeted manner. Ecologically, material is conserved and the service life of the base body is extended.<\/p>\n<ul>\n<li><strong>Availability:<\/strong> predictable cycles, fewer reactive repairs, and higher mean time between failures.<\/li>\n<li><strong>Performance:<\/strong> restored geometry, correct pressures and flows, and reproducible forces at the tool edge or wedge.<\/li>\n<li><strong>Risk reduction:<\/strong> lower leakage rates, fewer hose failures, and reduced secondary damage in the hydraulic circuit.<\/li>\n<li><strong>Sustainability:<\/strong> targeted part renewal conserves resources and reduces waste and energy input per service hour.<\/li>\n<\/ul>\n<h2>Relevance for concrete demolition shears and stone and concrete splitters<\/h2>\n<p><strong>Concrete demolition shears<\/strong> are subjected to cyclic high loads: cutting jaws meet reinforced concrete, impacts and transverse forces act on pins and bearing points, fine dust penetrates guides. Without overhaul, jaw play increases, cutting edges become rounded, seals fatigue- the cutting performance drops and operability suffers. An overhaul restores geometry and hydraulic pressure, reduces leakage, and maintains jaw parallelism. Consistent <em>jaw clearance<\/em> and <em>blade sharpness<\/em> are decisive for clean, low-vibration cuts and for protecting the carrier machine.<\/p>\n<p><strong>Stone and concrete splitters<\/strong> operate with very high pressures in the cylinder and localized peak forces on wedges. The overhaul safeguards the surface quality of the cylinder bore, the functionality of the seal packs, and correct wedge guidance. This keeps the splitting force reproducible, wedge insertion controlled, and reduces the risk of uncontrolled cracks in the rock. In <em>natural stone extraction<\/em> as well as in <em>rock excavation and tunnel construction<\/em> this is a key prerequisite for precise fracture patterns and predictable progress.<\/p>\n<h2>Typical components and wear patterns<\/h2>\n<h3>Seals, guides, and hydraulic components<\/h3>\n<p>Seals age thermally and mechanically, which leads to micro-leaks and pressure loss. Guides develop play, piston rods no longer run true, valves respond sluggishly. An overhaul replaces seal packs, checks valve seats, and sets the hydraulics to target values. For hydraulic power packs this also includes filter condition, oil quality, and testing of the hydraulic accumulator. <em>Cleanliness classes<\/em> and <em>filter saturation<\/em> are documented to keep contamination under control.<\/p>\n<h3>Mechanical joints: pins, bushings, linkages<\/h3>\n<p>Transverse loads and contamination increase wear at joint points. Worn pins or ovality in bushings change the kinematics. As part of an overhaul program, fits are measured, pins replaced, and bushings brazed in or press-fitted to restore the original clearance. Maintaining correct <strong>pin-to-bushing interference<\/strong> prevents premature play and impact loading.<\/p>\n<h3>Cutting and splitting tools<\/h3>\n<p>For <em>concrete demolition shears<\/em>, cutting edges lose sharpness or chipping occurs. Proper reconditioning includes regrinding within permissible limits or replacement. For <em>stone and concrete splitters<\/em>, wedges, spreading elements, and bearing surfaces are decisive; their geometry controls force flow and crack formation. Documented rework limits prevent overgrinding and preserve structural integrity.<\/p>\n<h3>Hydraulic hose lines and connection components<\/h3>\n<p>Hose aging, abrasion, and kinks are frequent failure causes. An overhaul program defines replacement intervals and visual inspection points to enable preventive replacement. Connection fittings are checked for tightness and tightening torque. Protective sleeves, routing, and bend radii are optimized to reduce chafing and heat stress.<\/p>\n<h2>Process of a professional overhaul<\/h2>\n<h3>Diagnosis and assessment<\/h3>\n<p>The process begins with a visual inspection, a functional check, and measurement of key parameters such as hydraulic pressure, leakage oil volume, and play in joints. Anomalies are documented. If available, historical data are compared to identify trend deviations.<\/p>\n<h3>Disassembly and cleaning<\/h3>\n<p>Disassembly is carried out in a controlled manner to protect components. Thorough cleaning enables the detection of fine scoring, cracks, or material fatigue. Particles in hydraulic channels are removed. Critical sealing and sliding surfaces are masked to avoid secondary damage.<\/p>\n<h3>Measurement and evaluation<\/h3>\n<p>Critical dimensions (e.g., fits, runout, planarity\/parallelism) are compared with reference values. The scope of the repair and the required spare parts are derived from this. Decision rules define whether rework or replacement is permissible for each component.<\/p>\n<h3>Repair and replacement<\/h3>\n<p>Wear parts such as seals, bushings, pins, cutting jaws, or wedges are replaced. Permissible rework on contact surfaces is performed as specified. Hydraulic components receive new seals; valves are checked and adjusted. Calibration of pressure-limiting and flow-control elements restores nominal tool dynamics.<\/p>\n<h3>Assembly, testing, and documentation<\/h3>\n<p>Assembly follows defined torque and installation rules. This is followed by a <strong>final inspection<\/strong> with functional and pressure tests. All work steps and measured values are documented in a traceable manner. A brief test run under load verifies that thermal behavior and response times are within limits.<\/p>\n<ul>\n<li><strong>Acceptance criteria:<\/strong> target pressure maintained, leakage within limit, geometry tolerances achieved, and no abnormal noise or temperature rise.<\/li>\n<\/ul>\n<h2>Intervals and trigger criteria<\/h2>\n<p>Defined intervals are based on <em>operating hours, load spectrum, and environmental conditions<\/em>. In dusty environments or with high shock input- typical for <em>concrete demolition<\/em> and <em>rock excavation<\/em>&#8211; shorter cycles are advisable. Condition-based triggers include measurable pressure drop, increased leakage, excessive play, unusual noises, or temperature rise in the oil circuit. For <em>concrete demolition shears<\/em>, wear markers on cutting jaws serve as a practical limit; for <em>stone and concrete splitters<\/em>, seal condition and cylinder performance are decisive.<\/p>\n<ul>\n<li><strong>Typical triggers:<\/strong> pressure deviation greater than 5 to 10 percent, leakage increase beyond defined ml\/min limits, pin-bushing play above specification, or contamination class above target.<\/li>\n<li><strong>Event-based triggers:<\/strong> impact incidents, overheating, visible damage, or repeated hose replacement within a short period.<\/li>\n<\/ul>\n<h2>Documentation, quality assurance, and test certificates<\/h2>\n<p>A robust overhaul program relies on traceable documentation: check records, measured values, and releases provide the evidence. For hydraulic power packs, test reports with cavitation test, pressure test, and leakage test are suitable. For tools such as <em>concrete demolition shears<\/em> and <em>stone and concrete splitters<\/em>, functional tests under load are informative. The qualification of the personnel and suitable test equipment ensure the reproducibility of the results.<\/p>\n<ul>\n<li><strong>Records:<\/strong> incoming inspection logs, measurement protocols, parts lists, torque records, and final acceptance reports.<\/li>\n<li><strong>KPIs:<\/strong> leakage rate, test pressure stability duration, cycle time under load, and post-overhaul failure rate.<\/li>\n<li><strong>Traceability:<\/strong> unique job ID, tool ID, date, and signatures for each step, preferably in a digital service history.<\/li>\n<\/ul>\n<h2>Safety and general compliance aspects<\/h2>\n<p>Overhauls serve <strong>occupational safety<\/strong>. Refurbished tools should reliably fulfill the intended functions. It is advisable to take relevant regulations and manufacturer specifications into account and to grant release only after a passed final inspection. Notes on CE marking, conformity, and documentation are to be understood in general terms and do not replace an individual assessment of the specific case.<\/p>\n<ul>\n<li><strong>Safe procedures:<\/strong> energy isolation, pressure relief, and cleanliness control during disassembly and testing.<\/li>\n<li><strong>Conformity:<\/strong> adherence to applicable directives and national rules for pressure equipment and machinery.<\/li>\n<li><strong>Marking:<\/strong> update of identification plates, test dates, and next due date where required.<\/li>\n<\/ul>\n<h2>Cost-effectiveness and sustainability<\/h2>\n<p>A well-designed overhaul program lowers <em>life-cycle costs<\/em> because plannable downtimes simplify deployment planning and prevent costly consequential damage. Preserving base bodies reduces material and energy demand, which is environmentally beneficial. For <em>concrete demolition shears<\/em> and <em>stone and concrete splitters<\/em>, replacing wear parts is usually far more resource-efficient than complete replacement. Transparent cost tracking per operating hour and per ton processed makes the value contribution visible over time.<\/p>\n<h2>Practical relevance by product group<\/h2>\n<h3>Concrete demolition shears<\/h3>\n<p>Overhaul focuses on cutting jaws, pins\/bushings, seals in the rotation or swing area, and the hydraulic circuit. The goal is to restore cutting performance, minimize play, and ensure tight, responsive hydraulics. Correct blade torqueing and jaw alignment are verified under light preload.<\/p>\n<h3>Stone and concrete splitters<\/h3>\n<p>The focus is on cylinders, seal packs, splitting wedges, and the guidance of spreading elements. Refurbishing wedge faces and setting correct hydraulic pressures are essential for reproducible splitting results. Controlled test splits confirm crack initiation and propagation behavior.<\/p>\n<h3>Hydraulic power packs<\/h3>\n<p>Filters, oil quality, tightness, valves, the hydraulic accumulator, and temperature level are central points. A defined oil care regime and testing for cavitation protect connected tools over the long term. Flow and pressure control are calibrated to match the connected attachment&#8217;s specification window.<\/p>\n<h3>Combination shears, Multi Cutters, and steel shears<\/h3>\n<p>Replaceable inserts, pins\/bushings, and the planparallel alignment of cutting surfaces are checked and renewed. Pressure and flow parameters are set so that the cutting kinematics once again operate within the intended window. Insert wear is tracked against defined regrind and replacement limits.<\/p>\n<h3>Rock wedge splitters and tank cutters<\/h3>\n<p>For rock wedge splitters, tightness has top priority, supplemented by control of mechanical guidance. Tank cutters require particularly careful condition assessment and functional control, as cut quality and process safety are decisive. Test cuts on representative material validate stability and cut edge quality.<\/p>\n<h2>Influence of application areas<\/h2>\n<h3>Concrete demolition and special demolition<\/h3>\n<p>Changing material thicknesses, reinforcement densities, and installation situations generate changing peak loads. Overhaul programs therefore take dynamic load spectra and dust exposure into account. Protective measures for hydraulic interfaces are intensified in highly abrasive environments.<\/p>\n<h3>Building gutting and concrete cutting<\/h3>\n<p>Sensitive tool guidance and high repeat accuracy are paramount. Overhauls precisely align the kinematics and reduce leakage to enable clean cuts. Thermal management during continuous cuts is checked to avoid heat-induced drift.<\/p>\n<h3>Rock excavation and tunnel construction<\/h3>\n<p>High pressures, abrasive particles, and restricted access demand robust sealing systems and reliable hose routing. Overhaul intervals are often shorter here, and condition checks are more frequent. Quick-connect integrity and routing protection are given special attention.<\/p>\n<h3>Natural stone extraction<\/h3>\n<p>The desired fracture line in the rock requires defined splitting forces. Professional overhaul secures geometry and force flow and reduces scrap. Wedge surface finish and lubrication concept are matched to the stone structure.<\/p>\n<h3>Special demolition<\/h3>\n<p>Special boundary conditions require adapted testing and release processes. Detailed documentation helps demonstrate suitability for the respective purpose. Where atypical hazards exist, additional proof tests and sign-offs are integrated.<\/p>\n<h2>Integration into daily operations<\/h2>\n<p>A practical overhaul program is embedded in deployment planning. Tools are submitted at regular intervals based on operating hours or at the end of a project. Service kits for critical components are kept in stock so overhauls can be completed quickly. Condition data from functional tests flow into the next interval planning- creating a learning system of <em>predictive maintenance<\/em>.<\/p>\n<ul>\n<li><strong>Planning:<\/strong> align overhaul windows with project milestones and carrier machine availability.<\/li>\n<li><strong>Parts logistics:<\/strong> prepackaged seal and wear kits, including critical fasteners and documented torque values.<\/li>\n<li><strong>Feedback loop:<\/strong> feed measured values into the CMMS to adjust intervals and parts lists dynamically.<\/li>\n<\/ul>\n<h2>Differentiation: maintenance, overhaul, modernization<\/h2>\n<p>Maintenance preserves condition through cleaning, lubrication, adjustment, and replacement of operating supplies. The overhaul restores the intended condition when relevant deviations are present. Modernization or retrofit can be useful if technical solutions have proven themselves, for example through updated valve technology or optimized sealing materials- the decision should always be application-specific and carefully weighed. A clear decision matrix avoids mixing maintenance and overhaul scopes.<\/p>\n<h2>Quality characteristics of a good overhaul program<\/h2>\n<p>Quality is recognizable by clear test steps, measurable acceptance criteria, and complete documentation. For <strong>concrete demolition shears<\/strong> these include defined limits for play and jaw geometry; for <strong>stone and concrete splitters<\/strong> tightness and the achievable splitting force at a defined pressure. Transparency about the scope of parts, clean surfaces, and a traceable test run under load round off the process.<\/p>\n<ul>\n<li><strong>Metrics:<\/strong> target pressure achieved and held over time, verified geometry to drawing, leakage within limit, and documented run-in behavior.<\/li>\n<li><strong>Process capability:<\/strong> repeatable outcomes across jobs, supported by calibrated tools and verified test rigs.<\/li>\n<li><strong>Clarity:<\/strong> unambiguous scope definition, marked wear limits, and photo documentation of key steps.<\/li>\n<\/ul>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>An overhaul program is a central building block for the safe, cost-effective, and sustainable use of hydraulic demolition and cutting technology. It describes the systematic, plannable refurbishment of tools and hydraulic power packs over their entire life cycle. Especially in application areas such as concrete demolition and special demolition, building <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/overhaul-program\">read more&#8230;<\/a><\/p>\n","protected":false},"author":9,"featured_media":0,"parent":14846,"menu_order":0,"comment_status":"open","ping_status":"open","template":"tmpl\/template-wissen.php","meta":{"_acf_changed":false,"footnotes":"","_members_access_role":[],"_members_access_error":""},"class_list":["post-20229","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Overhaul Program for Hydraulic Demolition Tools<\/title>\n<meta name=\"description\" content=\"Planned overhauls for hydraulic demolition and cutting tools boost safety, uptime &amp; lower costs \u2713 Learn the essentials.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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