Ads Professional construction machinery - excavators, loaders, bulldozers from Staszów

Verified Construction Equipment - Used Machines from Global Leaders

We offer a comprehensive portfolio of used construction machines: crawler and wheeled excavators from 1.5 to 90 tons, wheeled loaders from 1 to 7m³, bulldozers, graders, road rollers, and specialized equipment. We collaborate with brands such as Caterpillar, Komatsu, Volvo, Hitachi, JCB, Liebherr, and Doosan. Each machine undergoes a 165-point technical inspection, including engine diagnostics, hydraulic system tests, undercarriage wear measurement, and ultrasonic inspection of welded structures. The savings when purchasing used equipment range from 40-60% while retaining 60-80% of the original operational resource.

Key Parameters Verified Before Sale

We conduct an analysis of hydraulic and engine oil (Fe<100ppm, Si<15ppm indicates proper filtration), cylinder compression tests (difference <10% between cylinders), measurement of pin and bushing thickness (acceptable wear <15%), hydraulic pump performance tests (minimum 90% of nominal flow), ECM computer diagnostics with a complete history of error codes, and thermal imaging of components under working load.

Main Categories of Construction Machines:

Crawler Excavators: CAT 320-390, Komatsu PC200-800, Volvo EC220-750. 2D/3D Grade Control systems, hydraulic quick couplers, demolition hammers. Stage V/Tier 4 Final engines.

Wheeled Loaders: CAT 950-990, Volvo L90-350, Komatsu WA380-600. Weighing systems, quick couplers, various bucket configurations. Z-bar or parallel kinematics.

Road Rollers: Bomag, Hamm, Dynapac from 1.5 to 25 tons. Intelligent compaction, GPS mapping, dual amplitude/frequency of vibrations.

Bulldozers: CAT D6-D10, Komatsu D65-475. GPS/laser control systems for blades, rippers, various blade widths.

Advanced FAQ - Technical Diagnostics and Condition Assessment

How to Conduct a Comprehensive Inspection of a CAT 336D2 L Excavator (36 tons) with Remaining Resource Assessment?

Engine diagnostics C9.3 ACERT: Download history from ECM: last 100h error codes, load histograms, idle time <30% is a good indicator. Cold engine compression test: 380-420 psi, difference between cylinders <10%. Cylinder cut-off test: single injector shut-off, RPM drop <15% per cylinder. Oil analysis: Fe<80ppm, Cr<15ppm (bushings), Si<15ppm (dust), viscosity in SAE class. Blow-by: <150 l/min at 1800 RPM indicates good condition. Boost pressure: 35-40 psi under full load, intercooler ΔT>40°C. Common rail fuel system: pressure 1800 bar ±100, balanced return flow. DPF/SCR filter: if Stage IV, back pressure <5 kPa, regeneration interval >50h. Hydraulic system (336 l/min @ 350 bar): Main pump flow test: minimum 95% of nominal flow for each pump. Internal leakage: cylinder drift test <30mm/10min under load. Cycle times at 1800 RPM: arm lift 5.3s, bucket close 3.5s, arm extend 2.8s. Relief valves: main 370 bar, overload 410 bar ±10 bar. Pilot pressure: 40 bar ±2, joystick response <100ms. Oil temperature: <80°C continuous operation, viscosity indicator >140. Cleanliness: ISO 18/16/13 or better, water content <0.05%. Swing motor: holds brake when off, smooth acceleration. Travel: straight tracking ±50mm/10m, two-speed operation. Undercarriage (acceptable wear ~50%): Tracks: pitch 190mm new, 195mm = 50% wear, >200mm replacement. Plate width: 600mm standard, spur height >25mm. Pins/bushings: side play <5mm, no frozen joints. Drive wheels: tooth wear <30%, no hook profile. Tensioning wheels: maximum diameter reduction 10mm, free rotation. Track tension: 320-380mm sag in the middle (CAT specification). Rollers: no flat spots, oil leaks, all rotating. Chain guides: present, <50% wear thickness. Structure and equipment: Boom/arm: ultrasonic 5 critical points, no cracks >2mm. Pin connections: play <2mm, measured with a dial gauge. Bucket: edge wear <50%, teeth present, no cracks. Quick coupler: lock verification, safety valve operation. Cylinder rods: no scratches >0.5mm deep, chrome intact. Swing bearing: play <8mm, uniform around the circumference. Counterweight: secure, no damage (affects stability). Cabin: valid ROPS/FOPS certification, unbroken glass, door seals OK. Electronics and monitoring: Display: all pixels working, menu navigation OK. Grade Control readiness: wiring, brackets, sensors present. Product Link: data transmission, authentic hours. Cameras: if installed, clear image, no damage. Air conditioning: cooling ΔT>15°C, compressor clutch operation. Work lights: preferably LED, all operational. Remaining resource assessment: At current 8000h: Undercarriage 50% = 4000h remaining. Engine overhaul: typically 12000-15000h = 4000-7000h remaining. Hydraulic pumps: average 10000h = 2000h to regeneration. Main components: 60% life remains. Expected costs for the next 2000h: ~15-20k EUR maintenance. ROI: at 1500h/year = 3-4 years of solid work.

How to Optimize the Performance of a Volvo L220H Loader in Loading Cycles?

Test machine parameters: D13J Tier 4 Final engine: 371 HP at 1400-1800 RPM. Bucket: 5.5m³ straight edge, nominal load capacity 9500kg. Operating weight: 32500kg, tipping load 22470kg. Hydraulics: 2×260 l/min with load sensing, pressure 25 MPa. OptiShift: transmission lock, RBB reverse braking. Cycle V test (truck loading): Setup: material pile height 3m, truck distance 10m. Material: gravel density 1.7 t/m³, moisture 5-8%. Goal: 30t truck, loading in 3-4 cycles. Cycle breakdown: Drive to pile: 4-5s @ 6 km/h 1st gear. Bucket penetration: 2-3s, parallel deviation. Lifting while reversing: 3-4s @ 8 km/h, arm up. Driving with load: 5-6s, stable approach to truck. Dumping: 2-3s, height 3.5m, full emptying. Return: 5-6s @ 12 km/h, arm lowered float. Total: 22-27s optimum, <30s acceptable. Performance measurements: Fuel consumption: 24-28 l/h during cycles. Hydraulic temperature: <75°C continuous operation. Tire slip: <10% during penetration. Bucket fill: 90-95% consistently (visually). Material residue: <5% after dumping. Cycles/hour: 120-140 realistically continuous. Load accuracy: ±3% with Load Assist weighing system.