overhaul of new holland b 90 (year of manufacture 2013) excavator and purchase of spare parts - gearbox (disassembled and replaced with a new one),control blocks (brain) engine part (dismantling the old and replacing it with a new one),rear wheel 16.9 x 28 (with disc),front wheel 12.15 x 18 (with disc),control blocks fuel pump brain (hand gas) (dismantling the old and replacing it with a new one),hydraulic pump (disassembled and replaced with a new one),cabin windows (rear and front) (disassembled and replaced with new ones),fuel pump (disassembled and replaced with a new one),fuel spark plugs (disassemble the old one and replace it with a new one),replacement of faulty wiring in the electrical system with a new one (complete restoration of electrical wiring) (dismantling the old and replacing it with a new one),fuses (disassembled and replaced with new ones),hose (air tube) (disassembled and replaced with a new one),hose heads (air tube clamps) (disassemble the old one and replace it with a new one), reassembly of the engine (replacement of necessary spare parts),water and oil cooling system (dismantling the old and replacing it with a new one), arrows (front and rear) (motion control springs) (dismantling the old and replacing it with a new one),drilling arm cylinder (disassembled and replaced with a new one),hydraulic distributor of drilling system (demolition and replacement of old one),drilling rig (0.22 m³) (demolition and replacement of the old one with a new one),drilling chisel teeth (removing the old one and replacing it with a new one),loading control system (dismantling the old and replacing it with a new one),loading knives (removing the old one and replacing it with a new one),fairy of the cooling system (dismantling the old and replacing it with a new one),door locks (right and left) (dismantling the old and replacing it with a new one),lamps 24 v,night lights,installation of cabin control system and instruction panel software