Spare parts supply is a central building block for the operability of hydraulic attachments and handheld tools in concrete demolition, building gutting, rock excavation, and rock demolition and tunnel construction. It ensures that wear and functional components for tools such as concrete demolition shears, rock and concrete splitters, steel shears, multi cutters, combination shears, tank cutters as well as the associated hydraulic power units and rock splitting cylinders are available on time, correctly matched, and with documented quality. A robust supply chain reduces downtime, lowers consequential costs, and protects the project schedule.
Definition: What is meant by spare parts supply
Spare parts supply refers to the entirety of all planning, procurement, logistics, and documentation measures that ensure the availability of quality-assured spare and wear parts throughout the entire life cycle of equipment and attachments. This includes identification and stocking of the right components, timely reordering, proper storage, traceable documentation, and safe installation. In the context of hydraulic concrete demolition shears and rock and concrete splitters, this particularly comprises components such as blades, cutting and crushing jaws, pins and bushings, wedge sets, seals and O-rings, hydraulic hose lines, filters, pressure gauges, valves, couplings as well as control and rotation components.
Relevance of spare parts supply in demolition, deconstruction, and rock works
In time-critical projects in concrete demolition and special deconstruction, building gutting, rock excavation and tunnel construction, or in natural stone extraction, the availability of spare parts has an immediate impact on productivity and safety. Downtime caused by worn cutting blades on concrete demolition shears or worn wedges in rock and concrete splitters immediately affects cycle times, noise and dust emission, as well as crew and equipment scheduling. Planned spare parts supply stabilizes these factors and creates operational confidence—especially for special operations with difficult access or limited time windows.
Typical spare and wear parts by equipment families
Concrete demolition shears
- Cutting blades and crushing jaws (hardened, dimensionally accurate)
- Pins, bearing bushings, shims
- Seal and guide kits for cylinders
- Slew ring bearings, rotation components
Rock and concrete splitters and rock splitting cylinders
- Splitting wedges and tie rods
- Seals, O-rings, rod seals
- High-pressure hoses and couplings
- Hydraulic control components
Hydraulic power packs
- Hydraulic filters, suction and pressure filter elements
- Hoses, quick couplings, sealing systems
- Pressure gauges, pressure relief and directional control valves
- Switches, plugs, cable protection (where present)
Combination shears, multi cutters, steel shears, tank cutters
- Cutting blades, blade holders, retaining pins
- Slew ring bearings, rotary motor and gearbox components
- Sealing and damping elements
- Stop and guide elements
Demand planning and stocking on site and in the workshop
Needs-based planning reduces bottlenecks without tying up unnecessary capital. Simple, transparent methods aligned with project duration, utilization, and wear profile have proven effective.
Planning principles
- Know wear profiles: Blades and wedges are subject to higher wear than structural components. Inspection data and bills of materials support forecasting.
- Define safety stocks: Minimum stocks are useful for critical parts with long lead times, especially for concrete demolition shears and rock and concrete splitters in continuous use.
- Seasonal and project context: Tunnel and deconstruction phases with restricted logistics require additional buffers.
- Standardized parts kits: Assembling ready-to-use kits (e.g., seal kit, blade set, pin/bushing) shortens downtime.
Logistics, storage, and quality assurance
Proper storage preserves the functionality of sensitive components and supports traceability.
Storage conditions
- Dry, clean environment, protection from UV radiation and chemicals
- Gentle storage of seals and hoses, no mechanical preloading
- Corrosion protection for machined metal surfaces and wedge sets
Documentation and labeling
- Record unambiguous spare part numbers and serial numbers
- Inspect and log goods receipt (visual check, dimensions, leak test per specification)
- Ensure traceability via delivery note, batch data, and installation reports
Maintenance strategies and replacement intervals
The choice of maintenance strategy is based on usage intensity, safety requirements, and the manufacturer’s specifications of Darda GmbH.
Strategy selection
- Preventive: Replacement at fixed intervals, suitable for blades, filters, seals.
- Condition-based: Replacement based on measured values (play, cutting edge condition, pressure loss, temperature).
- Predictive: Trend analysis of operating data (e.g., shear cycles, splitting pressure profiles) to schedule replacement.
Practical inspection notes
- Regular visual inspection of cutting edges, wedge faces, pins, and bushings
- Pressure and leak testing of the hydraulic system before and after parts replacement
- Check slew rings for smooth operation and play
Installation, safety, and functional testing
The installation of spare parts requires care, cleanliness, and compliance with the technical specifications of Darda GmbH. Improper installation can reduce performance and increase risks.
Recommendations for installation
- Work in a near-cleanroom manner: keep components and work area free of particles
- Observe specified tightening torques, fits, and installation orientations
- Depressurize the hydraulic system, set to zero pressure, then bleed properly
- Perform functional testing under load step by step and monitor temperatures
Spare part quality, fit accuracy, and material grade
For the required cutting and splitting performance, dimensionally accurate and material-appropriately treated parts are crucial. Heat treatment, surface quality, and tolerances must be matched to the respective tool. For concrete demolition shears, blade geometry influences the fracture line and the force required; for rock and concrete splitters, wedge geometry governs how splitting forces are introduced.
Life cycle, obsolescence, and long-term availability
Equipment is often used for many years. Planned spare parts supply takes into account model statuses, product maintenance, and possible changes to standard parts. Early notices about discontinued components and recommended alternatives are useful. For critical parts with long lead times, project-specific framework stocks should be agreed and updated in good time.
Key figures for managing spare parts supply
A few, well-understood key figures are suitable for assessing the supply.
- Delivery capability and lead time relative to demand
- Average downtime per parts replacement
- Consumption rate per operating hour and tool type
- Warehouse fill level and stock coverage
Special requirements in tunnel construction, natural stone extraction, and special operations
In geologically and logistically demanding environments, setup times and transport routes are extended. Therefore, keeping function-critical parts on hand—such as blade sets for concrete demolition shears, seal kits and wedges for rock and concrete splitters, and filters and couplings for hydraulic power packs—is particularly important. For special operations with difficult access, providing robust, dust- and moisture-protected parts kits is recommended.
Environmental and occupational safety during parts replacement
When handling hydraulic oil, cleaners, and used parts, environmental protection and occupational safety requirements must be observed. Used parts and operating supplies should be collected separately and routed to proper recycling or disposal. Sealing surfaces, wedges, and blades must be handled so that no uncontrolled splinters or sharp edges cause injuries.
Practical recommendations for a stable supply
- Keep bills of materials for deployed equipment up to date, especially for concrete demolition shears and rock and concrete splitters
- Record wear limits and inspection points in short, clear checklists
- Store preassembled parts kits for frequent maintenance
- Document events: cause of failure, parts replaced, test values, and date
- Use operating data to continuously optimize intervals