{"id":20117,"date":"2026-01-21T09:19:58","date_gmt":"2026-01-21T08:19:58","guid":{"rendered":"https:\/\/www.darda.de\/?page_id=20117"},"modified":"2026-06-13T09:43:22","modified_gmt":"2026-06-13T07:43:22","slug":"wear-part","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/wear-part","title":{"rendered":"Wear part"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>Wear parts are components that wear down through regular use and are therefore replaced at fixed or condition-based intervals. In hydraulic demolition and splitting technology &#8211; such as on concrete demolition shears, <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-rock-and-concrete-splitters\">stone and concrete splitters<\/a>, combination shears, multi cutters, steel shears, tank cutters, stone splitting cylinders as well as the associated <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">hydraulic power packs<\/a> &#8211; they largely determine performance, precision, and occupational safety. Anyone who understands the function, loads, and care of wear parts can extend service life, avoid unplanned downtime, and safeguard the quality of concrete demolition, building gutting, rock excavation, tunnel construction, natural stone extraction, and special operations. In professional practice, consistent documentation, traceable maintenance steps, and the use of specification-compliant consumables (<em>wear parts<\/em> in the narrow sense) form the basis for reliable results and calculable operating costs.<\/p>\n<h2>Definition: What is a wear part?<\/h2>\n<p>A wear part is a component for which material loss or fatigue is unavoidable under proper use. Typical mechanisms include abrasion (frictional wear), adhesion (material transfer), surface fatigue, impact loading, corrosion and &#8211; in hydraulic systems &#8211; also cavitation and fluid aging. For tools such as concrete demolition shears or stone and concrete splitters, this affects, among other things, cutting edges, jaws, pressing bars, pins and bearing bushings, seals, hose lines, quick couplings, and filters. Hydraulic power packs also contain wear parts, such as pump components, valve seats, filter elements, and sealing systems. What matters is that wear remains predictable: maintenance, inspection, and the <em>targeted<\/em> replacement are integral to safe and economical operation. In contrast to classic spare parts, wear parts are deliberately monitored with measured criteria and replaced before secondary damage occurs.<\/p>\n<h2>Typical wear parts on demolition and splitting equipment<\/h2>\n<p>The extent of wear depends on tool geometry, material pairings, surface hardness, lubrication, hydraulic pressure, impact rates, and on the material being processed (e.g., concrete with reinforcing steel, natural stone with high quartz content, steels). At a glance:<\/p>\n<ul>\n<li><strong>Concrete demolition shears<\/strong>: Cutting and breaking jaws, blade strips, press and wear plates, pins and bushings at pivot points, slew ring bearing components (if present), seals and hose bundles. Protective covers and stopper elements that absorb end-position loads can also be subject to wear.<\/li>\n<li><strong>Stone and concrete splitters<\/strong>: Wedges and counter-wedges, spacer plates, pressure and tension rods, guides, sealing systems of the stone splitting cylinders, high-pressure hoses and couplings. Contact faces and guide keys require particular attention to geometry retention.<\/li>\n<li><strong>Combination shears \/ multi cutters \/ steel shears \/ tank cutters<\/strong>: Cutting blades, anvils, blade holders, wear protection strips, bearing points, seals, hydraulic rotary feedthroughs. Depending on usage, guide rails and clamping elements may need periodic replacement to maintain cut quality.<\/li>\n<li><strong>Hydraulic power packs<\/strong>: Filter elements, seals, couplings, hoses, pump elements, valve seats; also oil as the working medium with limited aging stability. Vibration dampers and mounting elements can show fatigue in continuous operation.<\/li>\n<\/ul>\n<h2>Wear mechanisms and influencing factors<\/h2>\n<p>Wear arises from the interaction of load, material, and environmental conditions. The following mechanisms are particularly relevant in practice:<\/p>\n<ul>\n<li><strong>Abrasion<\/strong>: Hard minerals (e.g., quartz in concrete and natural stone) cause scoring and material removal on cutting edges and jaws.<\/li>\n<li><strong>Impact and shock loading<\/strong>: Alternating peak loads promote micro- and macro-cracks, especially at edges and bores.<\/li>\n<li><strong>Adhesion and cold welding<\/strong>: With metal-to-metal contact without sufficient lubrication (pins\/bushings), galling and material transfer occur.<\/li>\n<li><strong>Corrosion<\/strong>: Moist, chloride-laden environments and long downtimes promote pitting or crevice corrosion, including under residual stresses.<\/li>\n<li><strong>Cavitation and oil aging<\/strong>: In hydraulic systems, gas bubbles and aged media damage seals, valves, and pump surfaces.<\/li>\n<li><strong>Fretting<\/strong>: Small-amplitude micro-movements at bolted or pressed joints promote oxidized debris and notch formation, accelerating fatigue.<\/li>\n<\/ul>\n<h3>Influence of application areas<\/h3>\n<p>The application areas shape the wear pattern significantly:<\/p>\n<ul>\n<li><strong>Concrete demolition and special deconstruction<\/strong>: Concrete demolition shears often work on reinforced concrete; switching between hard aggregate and steel promotes edge rounding and blade breakage, joints are subjected to shock loads. Cutting angle and feed behavior influence chip formation and thermal input at the edges.<\/li>\n<li><strong>Building gutting and cutting<\/strong>: Combination shears and multi cutters encounter varying cross-sections; nonuniform material thicknesses create bending and torsional peaks at the blades. Frequent repositioning increases the number of load cycles at pivot points.<\/li>\n<li><strong>Rock excavation and tunnel construction<\/strong>: Stone and concrete splitters as well as stone splitting cylinders are exposed to highly abrasive mineral phases; wedges and counter-wedges benefit from high surface hardness and a correctly aligned force line (see <a href=\"https:\/\/www.darda.de\/en\/applications\/rock-demolition-and-tunnel-construction\">Rock demolition<\/a> for typical boundary conditions). Coolant-free operation requires meticulous debris removal to protect seals.<\/li>\n<li><strong>Natural stone extraction<\/strong>: Repeated splitting within the same grain matrix requires consistent wedge geometries; seals of the cylinders are exposed to dust and particles. Misalignment increases localized pressure peaks and accelerates wedge nose wear.<\/li>\n<li><strong>Special operations<\/strong>: Temperature deviations, moisture, or contaminated media impose additional requirements on seals, hoses, and corrosion protection. Submerged or splash-water operation demands enhanced corrosion control and adapted lubrication routines.<\/li>\n<\/ul>\n<h2>Condition assessment: inspection and measurement practices<\/h2>\n<p>A systematic condition assessment is the basis for plannable maintenance. The aim is to detect critical wear dimensions at an early stage and to decide safely whether reconditioning or replacement is required. Photographic documentation and consistent naming of measuring points improve traceability over the entire lifecycle.<\/p>\n<h3>Visual and functional inspection<\/h3>\n<ul>\n<li>Inspect cutting and breaking edges for chipping, cracks, edge rounding, and uneven wear.<\/li>\n<li>Check pins\/bushings for play, run-in marks, surface cracks, discoloration (overheating), and galling marks.<\/li>\n<li>Assess seals for sweating, leakage, swelling, or embrittlement; check hydraulic lines for chafe marks and bend radii.<\/li>\n<li>Hydraulic power packs: filter condition, differential pressure indicator (if present), pump noise, temperature behavior, oil condition (color, odor, particles).<\/li>\n<li>Where crack initiation is suspected, apply suitable non-destructive testing (e.g., dye penetrant on accessible edges) in accordance with safety guidance.<\/li>\n<\/ul>\n<h3>Measuring tools and key parameters<\/h3>\n<ul>\n<li>Calipers\/gauges to determine remaining cutting edge length, edge radius, and pin diameters.<\/li>\n<li>Check axial and radial play at pivot points; record slew ring bearing play (if present).<\/li>\n<li>Document hydraulic pressure and flow rate under load; evaluate the system\u2019s pressure-holding behavior.<\/li>\n<li>Track oil cleanliness and moisture (e.g., particle counts, water content) and correlate findings with filter differential pressure trends.<\/li>\n<\/ul>\n<h2>Maintenance, lubrication and oil management<\/h2>\n<p>Consistent care measurably reduces wear. Especially on concrete demolition shears and stone and concrete splitters, clean, regular lubrication of the joints greatly extends the service life of pins and bushings. Lubricants and oils must be compatible with sealing materials and temperature ranges specified for the equipment.<\/p>\n<ul>\n<li><strong>Lubrication<\/strong>: Service lubrication points according to the manufacturer\u2019s specifications; remove dusty deposits beforehand to avoid three-body abrasion. Consider defined relubrication intervals under harsh operating conditions and wipe off excess grease to prevent contamination build-up.<\/li>\n<li><strong>Fasteners<\/strong>: Check tightening torques; loosened screw joints increase relative movement and thus wear. Use torque markings to detect unintentional loosening between inspection intervals.<\/li>\n<li><strong>Oil condition<\/strong>: Adhere to change intervals and filter replacement; particles and water accelerate seal wear and component erosion. Aim for consistently clean hydraulic fluid and monitor temperature windows to curb oxidation and varnish formation.<\/li>\n<li><strong>Quick couplings<\/strong>: Keep clean and clean before coupling; dirt ingress acts like an abrasive in the system. Install dust caps and store hose ends protected from impact and UV exposure.<\/li>\n<\/ul>\n<h2>Replacement criteria and maintenance strategies<\/h2>\n<p>Depending on the operating profile, preventive, condition-based, or mixed strategies make sense. The goal is <strong>safe<\/strong> and economical operation without consequential damage to neighboring components. Clearly defined replacement thresholds and a stocked set of critical wear parts reduce downtime and ensure consistent performance.<\/p>\n<ul>\n<li><strong>Blades\/jaws<\/strong>: Replace in case of cracking, unacceptable edge rounding, or when geometry no longer guides the cut\/fracture line cleanly; for bolted-on blade strips, replace in time to protect carrier parts. Respect tightening patterns and reuse rules for fasteners only if permitted.<\/li>\n<li><strong>Pins\/bushings<\/strong>: Replace when permissible play limits are exceeded, upon crack indications or galling marks; always replace in pairs and with a compatible material pairing. After installation, check for free movement and correct lubrication pathways.<\/li>\n<li><strong>Seals\/hoses<\/strong>: In case of leakage, signs of aging, or after damage, replace immediately; renew hose lines at regular intervals. Observe bend radii and clamp positions to minimize dynamic stress.<\/li>\n<li><strong>Filters\/oil<\/strong>: Replace after operating hours or based on condition (differential pressure, oil condition); keep oil level and cleanliness continually in view. Where feasible, use staged filtration to protect sensitive components.<\/li>\n<\/ul>\n<h3>Refurbishment and repair<\/h3>\n<p>Hardfacing (build-up welding), grinding, or resetting blade strips are established measures. Note that heat input can change microstructural properties. Repair procedures should be aligned with the technical specifications and approvals of Darda GmbH. After refurbishment, verify hardness, geometry, and surface finish at critical contact zones and perform a functional test under controlled load.<\/p>\n<h2>Materials, hardness and surfaces<\/h2>\n<p>Wear parts are often made from tempered tool steels, wear-resistant fine-grain steels, or case-\/induction-hardened components. The right combination of core toughness and surface hardness is critical: an overly hard, brittle surface can chip; a soft surface wears too quickly. Surface treatments and coatings can reduce abrasion and adhesion but require correct processing and compatible mating partners. Proven approaches include nitriding or carburizing for case depth, induction hardening on shafts and pins, and PVD\/CVD coatings where low friction and scuff resistance are required; the resulting properties must match counterpart materials and expected load spectra.<\/p>\n<h2>Relation to products and applications<\/h2>\n<p>The selection and care of wear parts should always be matched to the specific tool and application area:<\/p>\n<ul>\n<li><strong>Concrete demolition shears<\/strong> in concrete demolition and during building gutting benefit from durable cutting edges and precisely fitting bearing points; robust joints and even force distribution are important to separate reinforcing steel and aggregates in a controlled manner. Blade seat flatness and correct shim use help stabilize the cut.<\/li>\n<li><strong>Stone and concrete splitters<\/strong> in rock excavation, tunnel construction, and natural stone extraction require precise wedge geometries and tight cylinder systems; wedges and counter-wedges are highly loaded and should be inspected early. Clean interfaces and correct lubrication of guide elements reduce stick-slip and improve reproducibility.<\/li>\n<li><strong>Combination shears, multi cutters, steel shears, tank cutters<\/strong> require blade sets tailored to the material and regular checks of blade holders and guide rails to keep kerf and cut quality stable. Monitoring cut force and cycle time trends can indicate emerging wear.<\/li>\n<li><strong>Hydraulic power packs<\/strong> provide the required pressure and flow rate; clean filters and tight couplings protect downstream wear parts in all tools. Attention to cooling performance prevents fluid aging and seal degradation.<\/li>\n<\/ul>\n<h2>Occupational safety and legal notes<\/h2>\n<p>Worn components increase the risk of component failure. Principles for safe operation:<\/p>\n<ul>\n<li>Remove tools with cracks, excessive play, or leaks from service and inspect.<\/li>\n<li>Depressurize before working on hydraulic lines, seals, or screw joints.<\/li>\n<li>Use only approved wear and spare parts; perform assembly according to the manufacturer\u2019s instructions of Darda GmbH.<\/li>\n<li>Ensure personal protective equipment and a safe working environment; secure loads against unintended movement.<\/li>\n<li>Apply lock-out\/tag-out procedures appropriate to the site and document release steps after maintenance.<\/li>\n<\/ul>\n<p>Legal requirements may vary by country and application environment. Inspection and maintenance intervals, documentation obligations, and personnel qualifications should comply with generally accepted engineering practice and applicable regulations. Keep records of inspections, torque checks, fluid changes, and part numbers to maintain traceability.<\/p>\n<h2>Sustainability, disposal and documentation<\/h2>\n<p>Wear parts are often made of high-quality materials and can be recycled in many cases. Proper separation of metals, elastomers, and residual materials facilitates return to material cycles. Durability results from clean processes: dust management at the construction site, oil care, corrosion-protective storage, and complete documentation of inspections, measurements, and replacement dates. In this way, the operability of concrete demolition shears, stone and concrete splitters, and the associated hydraulic power packs is sustainably ensured. Used oils and contaminated absorbents must be collected and disposed of in accordance with applicable environmental regulations; batch tracking of critical parts supports responsible end-of-life handling.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Wear parts are components that wear down through regular use and are therefore replaced at fixed or condition-based intervals. In hydraulic demolition and splitting technology &#8211; such as on concrete demolition shears, stone and concrete splitters, combination shears, multi cutters, steel shears, tank cutters, stone splitting cylinders as well as <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/wear-part\">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-20117","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>Wear Part Guide for Hydraulic Demolition Equipment<\/title>\n<meta name=\"description\" content=\"Master wear part selection and care for hydraulic demolition &amp; splitting tools 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