{"id":18990,"date":"2025-10-22T09:08:22","date_gmt":"2025-10-22T07:08:22","guid":{"rendered":"https:\/\/www.darda.de\/operating-supplies"},"modified":"2026-03-27T12:30:03","modified_gmt":"2026-03-27T11:30:03","slug":"operating-supplies","status":"publish","type":"page","link":"https:\/\/www.darda.de\/en\/knowledge\/operating-supplies","title":{"rendered":"Operating supplies"},"content":{"rendered":"<div class=\"wissen-inhaltsbereich\">\n<p>Operating supplies are the functional foundation of hydraulic demolition and cutting technology. From concrete demolition and special deconstruction to strip-out and cutting, all the way to rock excavation, tunnel construction, natural stone extraction, and special operations, the correct selection and care of hydraulic oils, lubricating greases, as well as cleaning and protective agents determine performance, precision, and durability. Especially for <strong>concrete demolition shears<\/strong> and <strong>stone and concrete splitters<\/strong> from Darda GmbH, operating supplies directly influence power transmission, thermal balance, wear, and reliability-and thus the efficient and safe execution of a project. Consistent service routines, fluid monitoring, and specification-compliant products align cutting and splitting performance with uptime targets while protecting components across the full lifecycle.<\/p>\n<h2>Definition: What is meant by operating supplies?<\/h2>\n<p>Operating supplies comprise all liquid and paste-like media required for the operation, lubrication, cooling, cleaning, or protection of machines and that are subject to regular inspection or replacement. These include, above all, hydraulic oils for <em>hydraulic power packs<\/em> and cylinders (i.e., <a href=\"https:\/\/www.darda.de\/en\/product-overview\/hydraulic-power-units\">hydraulic power units<\/a>), lubricating greases for the joints and bearings of shears and crushers, cleaners to remove dust and residues, and corrosion protection agents. Operating supplies are not components but function-critical media that transmit energy, reduce friction, support sealing functions, dissipate heat, and protect parts against corrosion.<\/p>\n<ul>\n<li><strong>Transmit energy<\/strong> in hydraulic systems while stabilizing motion and response<\/li>\n<li><strong>Reduce friction and wear<\/strong> at joints, bearings, guides, and sliding surfaces<\/li>\n<li><strong>Support sealing and cooling<\/strong> under high pressure and cycling loads<\/li>\n<li><strong>Preserve surfaces<\/strong> by preventing corrosion and residue build-up<\/li>\n<\/ul>\n<h2>Operating supplies in hydraulics and cutting technology: selection and care<\/h2>\n<p>In the high-pressure hydraulics of concrete demolition shears, stone splitting cylinders, combination shears, multi cutters, steel shears, and tank cutters from Darda GmbH, the <strong>viscosity<\/strong>, <strong>cleanliness<\/strong>, <strong>additive formulation<\/strong>, and <strong>material compatibility<\/strong> of the hydraulic fluid govern operating behavior. Suitable oils (e.g., HLP\/HVLP according to common standards) ensure low-friction power transmission, minimize cavitation, prevent stick-slip in precise cutting and splitting motions, and stabilize the temperature window. Systematic care includes correct filling, clean handling, finely tuned filtration, regular oil condition checks, and timely replacement. Defined sampling points, trend analysis, and cleanliness targets support early detection of deviations. NLGI 2 consistency greases with strong wear and corrosion protection stabilize the bearing points of shears and crushers-crucial for reproducible cuts and controlled splitting under varying loads. Base oil viscosity and thickener chemistry should match load, speed, and ambient humidity to avoid premature grease breakdown.<\/p>\n<ul>\n<li><strong>Care essentials<\/strong>: sealed containers, filtered transfers, dedicated tools, and labeled fittings reduce cross-contamination<\/li>\n<li><strong>Monitoring<\/strong>: track temperature, differential pressure on filters, and oil appearance to validate service intervals<\/li>\n<li><strong>Documentation<\/strong>: record batch numbers, fills, and changes to secure traceability<\/li>\n<\/ul>\n<h2>Types of operating supplies in stone and concrete processing<\/h2>\n<h3>Hydraulic oils (HLP, HVLP, bio-based options)<\/h3>\n<p>Hydraulic oils serve as power carriers and lubricants. HLP oils provide proven wear and corrosion protection, while HVLP oils offer an increased viscosity index for stable viscosity across a wide temperature range-advantageous under changing outdoor temperatures on construction sites. Bio-based, rapidly biodegradable hydraulic oils can be an alternative in ecologically sensitive locations, provided they meet requirements for oxidation stability, hydrolysis resistance, and seal compatibility. Base oil quality and shear-stable viscosity improvers are decisive for keeping operating viscosity within the optimal window throughout the duty cycle.<\/p>\n<h3>Hydraulic fluids with increased fire safety<\/h3>\n<p>For tasks involving heat input or ignition sources-such as tank cutting or work in areas with flammable media-water-containing HFC fluids or hardly flammable synthetic fluids are often considered. Pressure rating, lubricating film formation, and system material compatibility must be observed to maintain the desired performance of the hydraulic power packs and tools. Where applicable, derating of maximum load and careful supervision of fluid condition, water content, and corrosion protection are essential to sustain service reliability.<\/p>\n<h3>Lubricating greases for joints, shear bearings, and slides<\/h3>\n<p>Greases stabilize the kinematics of concrete demolition shears, steel shears, and combination shears. Recommended are pressure-stable greases with high mechanical stability and water resistance that provide protection even under dust exposure and splash water. The correct application quantity prevents both under-lubrication (high wear) and over-greasing (temperature spikes, seal stress).<\/p>\n<ul>\n<li><strong>Properties to look for<\/strong>: load-carrying capacity (AW or EP), water washout resistance, and corrosion inhibition<\/li>\n<li><strong>Application method<\/strong>: clean nipples and purge old grease where appropriate to avoid abrasive mixing<\/li>\n<li><strong>Interval control<\/strong>: adjust frequency to dust load, cycle rate, and observed bleed-out<\/li>\n<\/ul>\n<h3>Cleaners and corrosion protection media<\/h3>\n<p>Neutral to mildly alkaline cleaners remove cement dust, stone flour, and oil residues without attacking seals and coatings. Thin-film corrosion protection agents form temporary protective layers on bare surfaces and plug-in couplings-useful during interim storage, transport, or work in humid environments. After intensive cleaning, re-lubrication and function checks of moving parts restore baseline protection and smooth actuation.<\/p>\n<h2>Viscosity, temperature, and pressure: fit to the application<\/h2>\n<h3>Selection by ambient temperature<\/h3>\n<p>Viscosity must suit the start and operating temperatures of the hydraulics. In cold environments (e.g., rock excavation in winter, tunnel heading with low heat input), lower viscosity grades and HVLP oils ease cold starts and prevent sluggish movements. At high ambient temperatures and under continuous load, shear-stable oils with a higher viscosity index are advantageous to keep cylinder flow behavior and cutting performance consistent. Observing both pump minimum viscosity at startup and target operating viscosity under load preserves efficiency and response.<\/p>\n<h3>Pressure resistance and shear stability<\/h3>\n<p>High system pressures in stone and concrete splitters and <a href=\"https:\/\/www.darda.de\/en\/product-overview\/rock-splitters\">rock splitters<\/a> require additized oils with pronounced wear and extreme-pressure performance. Good shear stability prevents viscosity from dropping under cyclic loads-important for repeatability in serial cutting or splitting operations. Robust antiwear and EP packages protect valve plates, pistons, and sliding shoes against micro-pitting when duty cycles peak.<\/p>\n<h2>Cleanliness, filtration, and oil condition<\/h2>\n<h3>Particle cleanliness and filtration fineness<\/h3>\n<p><strong>Cleanliness is critical<\/strong>: Fine particles increase wear on valves, pumps, and cylinders, promote leakage, and shorten oil life. A filtration fineness matched to the target cleanliness level and correctly sized bypass and suction filters ensure consistent motion quality, e.g., the controlled closing of a concrete demolition shear.<\/p>\n<ul>\n<li>Combine return-line and pressure-line filtration where sensitivity is high<\/li>\n<li>Use guarded breathers or desiccant breathers on tanks to block moisture and dust ingress<\/li>\n<li>Apply offline filtration carts for conditioning after repairs or oil changes<\/li>\n<li>Track differential pressure to schedule timely filter changes without starving the pump<\/li>\n<\/ul>\n<h3>Water content, air, and foaming<\/h3>\n<p>Water promotes corrosion and additive breakdown; entrained air leads to compressibility, foaming, and cavitation. Anti-foam additives, careful bleeding after maintenance, and low-condensation storage of containers reduce these risks. Where water ingress is recurrent, consider dehydration measures and ensure all quick couplings, tank breathers, and seals are intact.<\/p>\n<h3>Oil aging and additive depletion<\/h3>\n<p>Thermal and oxidative aging manifests as darkening, odor, viscosity drift, or varnish formation. Regular oil condition checks (e.g., neutralization number, particles, water) support planned maintenance before performance losses in hydraulic power packs or shears become apparent. If varnish or sludge appears, schedule corrective actions such as filtration upgrades, temperature control, and, if needed, a controlled flush to restore valve responsiveness.<\/p>\n<h2>Compatibility with materials and components<\/h2>\n<h3>Seals and elastomers<\/h3>\n<p>Operating supplies must be compatible with seals (e.g., NBR, HNBR, FKM, PTFE). Incompatibilities show up as swelling, shrinking, or embrittlement-visible through increased leakage or sluggish movements. When changing oil types, pay attention to miscibility and flushing concepts. A short validation run with close leak checks after a fluid change helps confirm long-term seal stability.<\/p>\n<h3>Hoses, coatings, and surfaces<\/h3>\n<p>Additive packages and cleaning chemistry should not attack hoses, couplings, and surfaces. Manufacturer information on cleaner concentrations and dwell times helps prevent material damage. Avoid solvents that may induce stress cracking in plastics or soften coatings, and always neutralize or rinse where recommended.<\/p>\n<h2>Practice across application areas<\/h2>\n<h3>Concrete demolition and special deconstruction<\/h3>\n<p>In the context of <a href=\"https:\/\/www.darda.de\/en\/applications\/concrete-demolition-and-special-deconstruction\">concrete demolition and special deconstruction<\/a>, varying temperatures and high load cycles argue for HVLP oils with stable viscosity and consistent fine filtration. Dust exposure makes a tightly scheduled grease maintenance regime on the joints of concrete demolition shears sensible. Shock loads additionally favor oils with strong antiwear reserves and responsive filtration to capture impact-generated fines.<\/p>\n<h3>Strip-out and cutting<\/h3>\n<p>Precise tool guidance requires shear-stable hydraulic oils and cleanly operating valves. Cleaners with good material compatibility keep cutting edges and guides free of build-up. Low hysteresis in actuation and minimal stick-slip deliver straight cuts and reduce rework.<\/p>\n<h3>Rock excavation and tunnel construction<\/h3>\n<p>Cold starts and humidity call for low-temperature-capable oils and good water separation. Corrosion protection on uncoated steel surfaces prevents seizure due to corrosion after standstill. In confined headings, attention to fire-safety characteristics and exhaust-free cleaning chemistry can further mitigate risk.<\/p>\n<h3>Natural stone extraction<\/h3>\n<p>Long cycles with constant loads demand oxidation-stable oils and controlled oil temperatures. High-adhesion greases remain on exposed bearing points. Thermal balance and steady viscosity support consistent splitting forces across extended operating periods.<\/p>\n<h3>Special operations<\/h3>\n<p>Near heat sources or ignitable media, the use of hardly flammable hydraulic fluids can be appropriate; the system\u2019s pressure rating and lubricating performance must be considered. Where permissible, protective covers and thermal shields reduce radiant heat stress on hoses and couplings.<\/p>\n<h2>Change intervals, storage, and handling<\/h2>\n<h3>Change and inspection intervals<\/h3>\n<p>Intervals depend on operating hours, load profile, temperature, and environmental conditions. Condition-based strategies (oil analytics, filter monitoring) improve planning and avoid consequential damage to cylinders and valves. After major repairs, a shortened inspection interval and temporary offline filtration stabilize cleanliness and purge break-in debris.<\/p>\n<h3>Storage conditions and shelf life<\/h3>\n<p>Store containers dry, dust-protected, and temperature-controlled. Use opened containers as soon as possible; consistently avoid ingress of water and dust. <em>First-in, first-out<\/em> preserves product quality. Seal bungs immediately after decanting and avoid partial openings that pull moist air into the headspace.<\/p>\n<h3>Cleaning and filling<\/h3>\n<p>Clean tools and power packs before filling, use suitable fine filters when transferring, keep plug-in couplings clean, and bleed carefully after maintenance. This preserves the control precision of stone and concrete splitters and concrete demolition shears.<\/p>\n<ul>\n<li>Color-code funnels, hoses, and grease guns to one medium each to prevent mix-ups<\/li>\n<li>Wipe ports before connection and cap lines during pauses to block dirt ingress<\/li>\n<li>Prime filters and hoses to minimize aeration on restart<\/li>\n<\/ul>\n<h2>Signs of unsuitable or aged operating supplies<\/h2>\n<ul>\n<li>Sluggish or jerky cylinder motions, imprecise closing of shears<\/li>\n<li>Elevated operating temperatures, rapid oil-aging odor<\/li>\n<li>Foam in the tank, cavitation, unusual pump noises<\/li>\n<li>Increased wear at bearing points, imprints or discoloration on seals<\/li>\n<li>Increasing leakage, decreasing holding force during splitting<\/li>\n<li>Frequent filter clog indicators or rising differential pressure<\/li>\n<li>Sticky valve spools or visible varnish on housings and spools<\/li>\n<li>Milky oil appearance or persistent foam after standstill<\/li>\n<\/ul>\n<h2>Safety and environmental aspects<\/h2>\n<p>Operating supplies must be handled properly, labeled, and stored and disposed of in accordance with applicable regulations. Personal protective equipment, suitable containment systems, and avoiding mix-critical combinations increase occupational safety. Rapidly biodegradable hydraulic media can mitigate environmental impacts but must be carefully evaluated for performance and material compatibility. Spill response kits, trained personnel, and clearly marked storage zones add resilience to daily operations.<\/p>\n<h2>Checklist for selecting operating supplies<\/h2>\n<ol>\n<li>Clarify the application profile: temperature window, pressure level, load cycles, dust and moisture exposure<\/li>\n<li>Define the medium type: HLP\/HVLP, if applicable fire-resistant or bio-based<\/li>\n<li>Select viscosity grade to match start and operating temperatures<\/li>\n<li>Define cleanliness target and filtration, specify filling and transfer technique<\/li>\n<li>Check material compatibility with seals, hoses, and coatings<\/li>\n<li>Set up a maintenance and analytics plan: oil condition, filter changes, lubrication intervals<\/li>\n<li>Consider storage and disposal concept, ensure environmental protection<\/li>\n<li>Establish documentation and labeling: container IDs, batch tracking, and line marking<\/li>\n<li>Qualify responsibilities and training for handling, sampling, and contamination control<\/li>\n<\/ol>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Operating supplies are the functional foundation of hydraulic demolition and cutting technology. From concrete demolition and special deconstruction to strip-out and cutting, all the way to rock excavation, tunnel construction, natural stone extraction, and special operations, the correct selection and care of hydraulic oils, lubricating greases, as well as cleaning <a class=\"moretag\" href=\"https:\/\/www.darda.de\/en\/knowledge\/operating-supplies\">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":""},"class_list":["post-18990","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Operating Supplies for Hydraulics &amp; Cutting<\/title>\n<meta name=\"description\" content=\"Expert guide to operating supplies for hydraulic demolition and cutting tools \u2713 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