core/tasks/bc_backhoe_loader/task.json

{
 "task_id": "bc_backhoe_loader",
 "set": "core",
 "object": {
  "name": "backhoe loader",
  "aliases": [],
  "wikidata": "Q913743",
  "wikidata_url": "https://www.wikidata.org/wiki/Q913743",
  "wordnet": null,
  "family": "E"
 },
 "prompts": {
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  "functional": "Build a backhoe loader. Use a tractor unit for the base chassis, engine, and mobility. Attach a front loader bucket to move bulk materials at the front. Install a backhoe arm for digging at the rear, a backhoe bucket to hold earth, a boom to connect the arm to the vehicle, and a dipper stick to control digging depth. Include a hydraulic pump for power, an engine for mechanical energy, wheels for travel, outriggers for stability, and a control panel for operation. This machine is used for construction, digging holes, landscaping, and light transportation. It is designed for urban engineering and small construction projects. Ensure stability during digging using outriggers and by lowering the front bucket. Construct the machine using structural components like frame members and fasteners. Create a backhoe digging mechanism where the boom connects to the dipper stick, which connects to the backhoe bucket. Build a front loader mechanism using loader arms and the front loader bucket. Implement a hydraulic power system using the engine, hydraulic pump, cylinders, and lines. Set up a stabilization system where outriggers and the loader bucket carry loads to the ground. Build a propulsion system where the clutch connects to the transmission, engine, and wheels. Ensure the boom swings 180 to 200 degrees relative to the king-post and tilts relative to the king-post. Make the dipper stick tilt relative to the boom. Allow outriggers to slide relative to the tractor unit. Ensure wheels rotate relative to the axle.",
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  },
  "check_problems": []
 },
 "images": {
  "in_the_wild": [
   {
    "id": "W1",
    "path": "benchmark/tasks/bc_backhoe_loader/images/wild_01.png",
    "scene": "on a wooden desk by a window, soft daylight",
    "seed": 101,
    "seconds": 80.4,
    "generator": {
     "model": "Qwen/Qwen-Image-Edit-2511",
     "lora": null,
     "steps": 40,
     "true_cfg_scale": 4.0,
     "prompt": "Turn this 3D render into a realistic photograph of the same LEGO brick model of a backhoe loader, on a wooden desk by a window, soft daylight. Keep the object's exact shape, proportions, number of parts and how the parts are arranged; do not add, remove or reposition any part of the object. Photorealistic materials and natural lighting, sharp focus, the whole object in view.",
     "negative_prompt": "cartoon, 3d render, cgi, illustration, extra parts, missing parts, deformed, cropped object, text, watermark",
     "input": "benchmark/tasks/bc_backhoe_loader/reference_renders/bc_backhoe_loader_az035.png"
    },
    "fidelity": {
     "dino_similarity": 0.87,
     "vlm": {
      "category_match": true,
      "same_structure": true,
      "visible_parts": [
       "tractor unit",
       "front loader bucket",
       "backhoe arm",
       "backhoe bucket",
       "boom",
       "dipper stick",
       "wheels"
      ],
      "reason": "The photograph faithfully reproduces the LEGO backhoe loader from the reference render with identical structure and parts.",
      "model": "gemma-4-31b"
     },
     "passed": true
    }
   },
   {
    "id": "W2",
    "path": "benchmark/tasks/bc_backhoe_loader/images/wild_02.png",
    "scene": "resting on a dusty shelf, warm afternoon sun",
    "seed": 102,
    "seconds": 80.4,
    "generator": {
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     "negative_prompt": "cartoon, 3d render, cgi, illustration, extra parts, missing parts, deformed, cropped object, text, watermark",
     "input": "benchmark/tasks/bc_backhoe_loader/reference_renders/bc_backhoe_loader_az035.png"
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   "text": "Build a backhoe loader."
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   "text": "According to image W1, build a backhoe loader."
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   "text": "Build a backhoe loader. Use a tractor unit for the base chassis, engine, and mobility. Attach a front loader bucket to move bulk materials at the front. Install a backhoe arm for digging at the rear, a backhoe bucket to hold earth, a boom to connect the arm to the vehicle, and a dipper stick to control digging depth. Include a hydraulic pump for power, an engine for mechanical energy, wheels for travel, outriggers for stability, and a control panel for operation. This machine is used for construction, digging holes, landscaping, and light transportation. It is designed for urban engineering and small construction projects. Ensure stability during digging using outriggers and by lowering the front bucket. Construct the machine using structural components like frame members and fasteners."
  },
  {
   "condition_id": "attributes+image",
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   "image": "W1",
   "text": "According to image W1, build a backhoe loader. Use a tractor unit for the base chassis, engine, and mobility. Attach a front loader bucket to move bulk materials at the front. Install a backhoe arm for digging at the rear, a backhoe bucket to hold earth, a boom to connect the arm to the vehicle, and a dipper stick to control digging depth. Include a hydraulic pump for power, an engine for mechanical energy, wheels for travel, outriggers for stability, and a control panel for operation. This machine is used for construction, digging holes, landscaping, and light transportation. It is designed for urban engineering and small construction projects. Ensure stability during digging using outriggers and by lowering the front bucket. Construct the machine using structural components like frame members and fasteners."
  },
  {
   "condition_id": "functional",
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   "text": "Build a backhoe loader. Use a tractor unit for the base chassis, engine, and mobility. Attach a front loader bucket to move bulk materials at the front. Install a backhoe arm for digging at the rear, a backhoe bucket to hold earth, a boom to connect the arm to the vehicle, and a dipper stick to control digging depth. Include a hydraulic pump for power, an engine for mechanical energy, wheels for travel, outriggers for stability, and a control panel for operation. This machine is used for construction, digging holes, landscaping, and light transportation. It is designed for urban engineering and small construction projects. Ensure stability during digging using outriggers and by lowering the front bucket. Construct the machine using structural components like frame members and fasteners. Create a backhoe digging mechanism where the boom connects to the dipper stick, which connects to the backhoe bucket. Build a front loader mechanism using loader arms and the front loader bucket. Implement a hydraulic power system using the engine, hydraulic pump, cylinders, and lines. Set up a stabilization system where outriggers and the loader bucket carry loads to the ground. Build a propulsion system where the clutch connects to the transmission, engine, and wheels. Ensure the boom swings 180 to 200 degrees relative to the king-post and tilts relative to the king-post. Make the dipper stick tilt relative to the boom. Allow outriggers to slide relative to the tractor unit. Ensure wheels rotate relative to the axle."
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   "condition_id": "functional+image",
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   "text": "According to image W1, build a backhoe loader. Use a tractor unit for the base chassis, engine, and mobility. Attach a front loader bucket to move bulk materials at the front. Install a backhoe arm for digging at the rear, a backhoe bucket to hold earth, a boom to connect the arm to the vehicle, and a dipper stick to control digging depth. Include a hydraulic pump for power, an engine for mechanical energy, wheels for travel, outriggers for stability, and a control panel for operation. This machine is used for construction, digging holes, landscaping, and light transportation. It is designed for urban engineering and small construction projects. Ensure stability during digging using outriggers and by lowering the front bucket. Construct the machine using structural components like frame members and fasteners. Create a backhoe digging mechanism where the boom connects to the dipper stick, which connects to the backhoe bucket. Build a front loader mechanism using loader arms and the front loader bucket. Implement a hydraulic power system using the engine, hydraulic pump, cylinders, and lines. Set up a stabilization system where outriggers and the loader bucket carry loads to the ground. Build a propulsion system where the clutch connects to the transmission, engine, and wheels. Ensure the boom swings 180 to 200 degrees relative to the king-post and tilts relative to the king-post. Make the dipper stick tilt relative to the boom. Allow outriggers to slide relative to the tractor unit. Ensure wheels rotate relative to the axle."
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 "required_parts": [
  {
   "id": "P1",
   "part": "tractor unit",
   "why": "provides the base chassis, engine, and mobility for the machine",
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    {
     "kind": "wikipedia",
     "page": "Backhoe loader",
     "revision": 1341942271,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe_loader&oldid=1341942271",
     "quote": "A backhoe loader... is a heavy equipment vehicle that consists of a tractor-like unit fitted with a loader-style shovel/bucket on the front and a backhoe on the back."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states it consists of a tractor-like unit.",
    "regrounded": false
   }
  },
  {
   "id": "P2",
   "part": "front loader bucket",
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   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe loader",
     "revision": 1341942271,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe_loader&oldid=1341942271",
     "quote": "A backhoe loader... consists of a tractor-like unit fitted with a loader-style shovel/bucket on the front."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states it is fitted with a loader-style shovel/bucket on the front.",
    "regrounded": false
   }
  },
  {
   "id": "P3",
   "part": "backhoe arm",
   "why": "provides the articulated digging mechanism at the rear",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe",
     "revision": 1349545623,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe&oldid=1349545623",
     "quote": "A backhoe is a type of excavating equipment... consisting of a digging bucket on the end of a two-part articulated arm."
    },
    {
     "kind": "wikipedia",
     "page": "Backhoe loader",
     "revision": 1341942271,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe_loader&oldid=1341942271",
     "quote": "A backhoe loader... consists of a tractor-like unit fitted with... a backhoe on the back."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states it has a backhoe, which consists of an articulated arm.",
    "regrounded": false
   }
  },
  {
   "id": "P4",
   "part": "backhoe bucket",
   "why": "digs and holds earth at the end of the backhoe arm",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe",
     "revision": 1349545623,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe&oldid=1349545623",
     "quote": "A backhoe is a type of excavating equipment... consisting of a digging bucket on the end of a two-part articulated arm."
    },
    {
     "kind": "wikidata",
     "item": "Q182661",
     "item_label": "excavator",
     "property": "P527",
     "property_label": "has part",
     "value": "Q1812627",
     "value_label": "bucket",
     "statement": "Q182661$84cb28dd-478a-0fad-af0b-6d84b0d1ed99",
     "url": "https://www.wikidata.org/wiki/Q182661#P527"
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   ],
   "support": "both",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states a backhoe consists of a digging bucket.",
    "regrounded": false
   }
  },
  {
   "id": "P5",
   "part": "boom",
   "why": "connects the backhoe arm to the vehicle and allows pivoting and lifting",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe",
     "revision": 1349545623,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe&oldid=1349545623",
     "quote": "The section of the arm closest to the vehicle is known as the boom... It allows the arm to pivot left and right... and also enables lifting and lowering movements."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states the section of the arm closest to the vehicle is the boom.",
    "regrounded": false
   }
  },
  {
   "id": "P6",
   "part": "dipper stick",
   "why": "connects the bucket to the boom and controls digging depth",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe",
     "revision": 1349545623,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe&oldid=1349545623",
     "quote": "The section that carries the bucket is known as the dipper (or dipper-stick)..."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states the section that carries the bucket is the dipper-stick.",
    "regrounded": false
   }
  },
  {
   "id": "P7",
   "part": "hydraulic pump",
   "why": "generates hydraulic power to operate the loader and backhoe arms",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Hydraulic pump",
     "revision": 1367723699,
     "url": "https://en.wikipedia.org/w/index.php?title=Hydraulic_pump&oldid=1367723699",
     "quote": "A hydraulic pump is a mechanical source of power that converts mechanical power into hydraulic energy..."
    },
    {
     "kind": "wikidata",
     "item": "Q182661",
     "item_label": "excavator",
     "property": "P527",
     "property_label": "has part",
     "value": "Q1640143",
     "value_label": "hydraulic pump",
     "statement": "Q182661$bada74ad-4889-f09c-d573-ee3980c871fd",
     "url": "https://www.wikidata.org/wiki/Q182661#P527"
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   ],
   "support": "both",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Wikidata states an excavator (class of backhoe) has a hydraulic pump.",
    "regrounded": false
   }
  },
  {
   "id": "P8",
   "part": "engine",
   "why": "provides the mechanical energy to drive the vehicle and hydraulic systems",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Engine",
     "revision": 1373928937,
     "url": "https://en.wikipedia.org/w/index.php?title=Engine&oldid=1373928937",
     "quote": "An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy."
    },
    {
     "kind": "wikidata",
     "item": "Q182661",
     "item_label": "excavator",
     "property": "P527",
     "property_label": "has part",
     "value": "Q44167",
     "value_label": "engine",
     "statement": "Q182661$4d211713-493c-7be9-5f7c-ce8f91951fce",
     "url": "https://www.wikidata.org/wiki/Q182661#P527"
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   ],
   "support": "both",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Wikidata states an excavator (class of backhoe) has an engine.",
    "regrounded": false
   }
  },
  {
   "id": "P9",
   "part": "wheels",
   "why": "enable the vehicle to travel over land",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Wheel",
     "revision": 1372796054,
     "url": "https://en.wikipedia.org/w/index.php?title=Wheel&oldid=1372796054",
     "quote": "A wheel is a rotating component... intended to turn on an axle bearing... Wheels... allow heavy objects to be moved easily..."
    },
    {
     "kind": "wikidata",
     "item": "Q1301433",
     "item_label": "land vehicle",
     "property": "P527",
     "property_label": "has part",
     "value": "Q446",
     "value_label": "wheel",
     "statement": "Q1301433$50069ba7-43ad-e343-3992-4fda37bda007",
     "url": "https://www.wikidata.org/wiki/Q1301433#P527"
    }
   ],
   "support": "both",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Wikidata states a land vehicle (class of backhoe) has wheels.",
    "regrounded": false
   }
  },
  {
   "id": "P10",
   "part": "outriggers",
   "why": "stabilize the machine during digging to prevent tipping",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe loader",
     "revision": 1341942271,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe_loader&oldid=1341942271",
     "quote": "Most backhoe loaders use hydraulic outriggers or stabilizers at the rear when digging and lower the loader bucket for additional stability."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states most backhoe loaders use hydraulic outriggers.",
    "regrounded": false
   }
  },
  {
   "id": "P11",
   "part": "control panel",
   "why": "allows the operator to control the machine's functions",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Control panel (engineering)",
     "revision": 1333516759,
     "url": "https://en.wikipedia.org/w/index.php?title=Control_panel_%28engineering%29&oldid=1333516759",
     "quote": "A control panel is a flat, often vertical, area where control or monitoring instruments are displayed..."
    },
    {
     "kind": "wikidata",
     "item": "Q1882685",
     "item_label": "mechanical device",
     "property": "P527",
     "property_label": "has part",
     "value": "Q239001",
     "value_label": "control panel",
     "statement": "Q1882685$AF55468A-7D40-470F-A181-5001F7FDC064",
     "url": "https://www.wikidata.org/wiki/Q1882685#P527"
    }
   ],
   "support": "both",
   "verification": {
    "depth": "computed",
    "check": "a part declared with this role exists and is connected to the assembly",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Wikidata states a mechanical device (class of backhoe) has a control panel.",
    "regrounded": false
   }
  }
 ],
 "required_attributes": [
  {
   "id": "A1",
   "kind": "use",
   "statement": "Backhoe loaders are used for construction, digging holes, landscaping, and light transportation of building materials.",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe loader",
     "revision": 1341942271,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe_loader&oldid=1341942271",
     "quote": "Backhoe loaders are very common and can be used for a wide variety of tasks: construction, small demolitions, light transportation of building materials... digging holes/excavation, landscaping..."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "adjudicated",
    "check": "judged against the design's declared parts, materials and renders",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence explicitly lists these uses.",
    "regrounded": false
   }
  },
  {
   "id": "A2",
   "kind": "operating_environment",
   "statement": "They are commonly used in urban engineering and small construction projects due to their small size and versatility.",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe loader",
     "revision": 1341942271,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe_loader&oldid=1341942271",
     "quote": "Due to its (relatively) small size and versatility, backhoe loaders are very common in urban engineering and small construction projects..."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "adjudicated",
    "check": "judged against the design's declared parts, materials and renders",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence explicitly states this.",
    "regrounded": false
   }
  },
  {
   "id": "A3",
   "kind": "property",
   "statement": "The machine is designed to be stable during digging by using outriggers and lowering the front bucket.",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe loader",
     "revision": 1341942271,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe_loader&oldid=1341942271",
     "quote": "Because digging while on tires intrinsically causes the machine to rock... most backhoe loaders use hydraulic outriggers or stabilizers at the rear when digging and lower the loader bucket for additional stability."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "adjudicated",
    "check": "judged against the design's declared parts, materials and renders",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states outriggers and lowering the bucket provide additional stability.",
    "regrounded": false
   }
  },
  {
   "id": "A4",
   "kind": "material",
   "statement": "The machine consists of structural components such as frame members and fasteners.",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Machine element",
     "revision": 1353184220,
     "url": "https://en.wikipedia.org/w/index.php?title=Machine_element&oldid=1353184220",
     "quote": "Machine element... refers to an elementary component of a machine. These elements consist of three basic types: structural components such as frame members... fasteners..."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "adjudicated",
    "check": "material declared per part, checked against the claim and the renders",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states machine elements consist of structural components and fasteners.",
    "regrounded": false
   }
  }
 ],
 "functional_subsystems": [
  {
   "id": "F1",
   "subsystem": "Backhoe digging mechanism",
   "parts": [
    "boom",
    "dipper stick",
    "backhoe bucket",
    "king-post",
    "hydraulic cylinders"
   ],
   "function": "Excavates earth by articulating the arm and bucket at the rear of the vehicle.",
   "connections": [
    {
     "from": "boom",
     "to": "dipper stick",
     "carries": "motion"
    },
    {
     "from": "dipper stick",
     "to": "backhoe bucket",
     "carries": "motion"
    }
   ],
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe",
     "revision": 1349545623,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe&oldid=1349545623",
     "quote": "The section of the arm closest to the vehicle is known as the boom... while the section that carries the bucket is known as the dipper..."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "presence, placement and connection of the named parts on the part graph; internal working is declared",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states backhoe is excavating equipment with an articulated arm and bucket.",
    "regrounded": false,
    "removed_details": [
     "In a backhoe loader, the king-post connects to the boom and passes motion."
    ],
    "detail_support": {
     "connections[0]": false,
     "connections[1]": true,
     "connections[2]": true
    }
   }
  },
  {
   "id": "F2",
   "subsystem": "Front loader mechanism",
   "parts": [
    "loader arms",
    "front loader bucket",
    "hydraulic cylinders"
   ],
   "function": "Lifts and moves bulk materials at the front of the vehicle.",
   "connections": [],
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe loader",
     "revision": 1341942271,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe_loader&oldid=1341942271",
     "quote": "A backhoe loader... consists of a tractor-like unit fitted with a loader-style shovel/bucket on the front."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "presence, placement and connection of the named parts on the part graph; internal working is declared",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states it has a loader-style shovel/bucket on the front.",
    "regrounded": false,
    "removed_details": [
     "In a backhoe loader, the loader arms connects to the front loader bucket and passes motion."
    ],
    "detail_support": {
     "connections[0]": false
    }
   }
  },
  {
   "id": "F3",
   "subsystem": "Hydraulic power system",
   "parts": [
    "hydraulic pump",
    "hydraulic cylinders",
    "hydraulic lines",
    "engine"
   ],
   "function": "Converts engine mechanical power into hydraulic energy to move the loader and backhoe arms.",
   "connections": [],
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Hydraulic pump",
     "revision": 1367723699,
     "url": "https://en.wikipedia.org/w/index.php?title=Hydraulic_pump&oldid=1367723699",
     "quote": "A hydraulic pump is a mechanical source of power that converts mechanical power into hydraulic energy..."
    },
    {
     "kind": "wikipedia",
     "page": "Hydraulic pump",
     "revision": 1367723699,
     "url": "https://en.wikipedia.org/w/index.php?title=Hydraulic_pump&oldid=1367723699",
     "quote": "When a hydraulic pump operates, it creates a vacuum at the pump inlet... and by mechanical action delivers this liquid to the pump outlet and forces it into the hydraulic system."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "presence, placement and connection of the named parts on the part graph; internal working is declared",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states pumps convert mechanical power to hydraulic energy for the system.",
    "regrounded": false,
    "removed_details": [
     "In a backhoe loader, the engine connects to the hydraulic pump and passes power.",
     "In a backhoe loader, the hydraulic pump connects to the hydraulic cylinders and passes fluid."
    ],
    "detail_support": {
     "connections[0]": false,
     "connections[1]": false
    }
   }
  },
  {
   "id": "F4",
   "subsystem": "Stabilization system",
   "parts": [
    "outriggers",
    "loader bucket"
   ],
   "function": "Prevents the vehicle from tipping during digging operations.",
   "connections": [
    {
     "from": "outriggers",
     "to": "ground",
     "carries": "load"
    },
    {
     "from": "loader bucket",
     "to": "ground",
     "carries": "load"
    }
   ],
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe loader",
     "revision": 1341942271,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe_loader&oldid=1341942271",
     "quote": "Most backhoe loaders use hydraulic outriggers or stabilizers at the rear when digging and lower the loader bucket for additional stability."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "presence, placement and connection of the named parts on the part graph; internal working is declared",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states outriggers and loader bucket are used for stability when digging.",
    "regrounded": false,
    "detail_support": {
     "connections[0]": true,
     "connections[1]": true
    }
   }
  },
  {
   "id": "F5",
   "subsystem": "Propulsion system",
   "parts": [
    "engine",
    "wheels",
    "transmission",
    "clutch"
   ],
   "function": "Moves the vehicle from one location to another.",
   "connections": [
    {
     "from": "clutch",
     "to": "transmission",
     "carries": "motion"
    }
   ],
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Propulsion",
     "revision": 1362484300,
     "url": "https://en.wikipedia.org/w/index.php?title=Propulsion&oldid=1362484300",
     "quote": "A propulsion system is a machine system consisting of at least two core elements: the powerplant... and the propulsor..."
    },
    {
     "kind": "wikipedia",
     "page": "Clutch",
     "revision": 1339925193,
     "url": "https://en.wikipedia.org/w/index.php?title=Clutch&oldid=1339925193",
     "quote": "In a motor vehicle, the clutch acts as a mechanical linkage between the engine and transmission."
    },
    {
     "kind": "wikidata",
     "item": "Q1301433",
     "item_label": "land vehicle",
     "property": "P527",
     "property_label": "has part",
     "value": "Q446",
     "value_label": "wheel",
     "statement": "Q1301433$50069ba7-43ad-e343-3992-4fda37bda007",
     "url": "https://www.wikidata.org/wiki/Q1301433#P527"
    }
   ],
   "support": "both",
   "verification": {
    "depth": "computed",
    "check": "presence, placement and connection of the named parts on the part graph; internal working is declared",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence links engine, clutch, transmission, and wheels to propulsion of a motor vehicle.",
    "regrounded": false,
    "removed_details": [
     "In a backhoe loader, the engine connects to the wheels and passes power."
    ],
    "detail_support": {
     "connections[0]": false,
     "connections[1]": true
    }
   }
  }
 ],
 "required_kinematics": [
  {
   "id": "K1",
   "moving_part": "boom",
   "relative_to": "king-post",
   "motion": "swings",
   "joint_type": "revolute",
   "axis": null,
   "range": "180 to 200 degrees",
   "actuation": null,
   "coupled_with": "dipper stick and bucket",
   "scope": "general",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe",
     "revision": 1349545623,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe&oldid=1349545623",
     "quote": "The boom... allows the arm to pivot left and right, typically through a range of 180 to 200 degrees..."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "joint matching on moving part, type and axis, then a collision-checked sweep",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states the boom allows the arm to pivot left and right.",
    "regrounded": false,
    "declared_details": [
     "relative_to: king-post"
    ],
    "removed_details": [
     "axis: vertical axis at the king-post",
     "actuation: motor"
    ],
    "detail_support": {
     "relative_to": false,
     "axis": false,
     "range": true,
     "actuation": false,
     "coupled_with": true
    }
   }
  },
  {
   "id": "K2",
   "moving_part": "boom",
   "relative_to": "king-post",
   "motion": "tilts",
   "joint_type": "revolute",
   "axis": null,
   "range": "null",
   "actuation": null,
   "coupled_with": "dipper stick and bucket",
   "scope": "general",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe",
     "revision": 1349545623,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe&oldid=1349545623",
     "quote": "The boom... enables lifting and lowering movements."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "joint matching on moving part, type and axis, then a collision-checked sweep",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Evidence states the boom enables lifting and lowering movements.",
    "regrounded": false,
    "declared_details": [
     "relative_to: king-post"
    ],
    "removed_details": [
     "axis: horizontal axis at the king-post",
     "actuation: motor"
    ],
    "detail_support": {
     "relative_to": false,
     "axis": false,
     "actuation": false,
     "coupled_with": true
    }
   }
  },
  {
   "id": "K3",
   "moving_part": "dipper stick",
   "relative_to": "boom",
   "motion": "tilts",
   "joint_type": "revolute",
   "axis": null,
   "range": "null",
   "actuation": null,
   "coupled_with": "backhoe bucket",
   "scope": "general",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe",
     "revision": 1349545623,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe&oldid=1349545623",
     "quote": "A backhoe is a type of excavating equipment... consisting of a digging bucket on the end of a two-part articulated arm."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "joint matching on moving part, type and axis, then a collision-checked sweep",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "An articulated arm entails tilting/pivoting movements.",
    "regrounded": false,
    "removed_details": [
     "axis: horizontal axis at the boom tip",
     "actuation: motor"
    ],
    "detail_support": {
     "relative_to": true,
     "axis": false,
     "actuation": false,
     "coupled_with": true
    }
   }
  },
  {
   "id": "K4",
   "moving_part": "outriggers",
   "relative_to": "tractor unit",
   "motion": "slides",
   "joint_type": "prismatic",
   "axis": null,
   "range": "null",
   "actuation": "motor",
   "coupled_with": "null",
   "scope": "general",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Backhoe loader",
     "revision": 1341942271,
     "url": "https://en.wikipedia.org/w/index.php?title=Backhoe_loader&oldid=1341942271",
     "quote": "Most backhoe loaders use hydraulic outriggers or stabilizers at the rear when digging..."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "joint matching on moving part, type and axis, then a collision-checked sweep",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Hydraulic outriggers imply sliding/extending motion.",
    "regrounded": false,
    "removed_details": [
     "axis: vertical axis"
    ],
    "detail_support": {
     "relative_to": true,
     "axis": false,
     "actuation": true
    }
   }
  },
  {
   "id": "K5",
   "moving_part": "wheels",
   "relative_to": "axle",
   "motion": "rotates",
   "joint_type": "revolute",
   "axis": "axle axis",
   "range": null,
   "actuation": null,
   "coupled_with": null,
   "scope": "general",
   "sources": [
    {
     "kind": "wikipedia",
     "page": "Wheel",
     "revision": 1372796054,
     "url": "https://en.wikipedia.org/w/index.php?title=Wheel&oldid=1372796054",
     "quote": "A wheel is a rotating component... intended to turn on an axle bearing."
    }
   ],
   "support": "text-quoted",
   "verification": {
    "depth": "computed",
    "check": "joint matching on moving part, type and axis, then a collision-checked sweep",
    "model": "gemma-4-31b",
    "supported": true,
    "general": true,
    "reason": "Wheels are defined as rotating components.",
    "regrounded": false,
    "removed_details": [
     "range: continuous",
     "actuation: motor",
     "coupled_with: engine"
    ],
    "detail_support": {
     "relative_to": true,
     "axis": true,
     "range": false,
     "actuation": false,
     "coupled_with": false
    }
   }
  }
 ],
 "optional_kinematics": [],
 "reference": {
  "object_id": "brickcomposer-23936",
  "dataset": "BrickComposer collection (BrickLink Studio models)",
  "record": "23936_backhoe.io",
  "license": "per-model terms of the original Studio model; not established here",
  "part_count": 115,
  "cad_files": [
   {
    "role": "complete assembly",
    "format": "LDR",
    "path": "benchmark/tasks/bc_backhoe_loader/reference/brickcomposer-23936.ldr"
   }
  ],
  "reference_glb": null,
  "alternates": [],
  "realizes": {
   "method": "lexical overlap between claim part names and reference part roles; LEGO joints are not annotated",
   "parts": {
    "P1": [],
    "P2": [
     "excavator bucket 8x4 with click hinge 2-finger"
    ],
    "P3": [
     "hinge arm locking with single finger and friction pin",
     "minifig arm left",
     "minifig arm right",
     "plate 2x2 with wishbone suspension arms and pins"
    ],
    "P4": [
     "excavator bucket 8x4 with click hinge 2-finger"
    ],
    "P5": [],
    "P6": [
     "hinge control stick",
     "hinge control stick base"
    ],
    "P7": [],
    "P8": [],
    "P9": [
     "wheel rim 14x18 with holes on both sides needs work"
    ],
    "P10": [],
    "P11": [
     "hinge control stick",
     "hinge control stick base",
     "panel 1x2x1 with square corners"
    ]
   },
   "kinematics": {
    "K1": [],
    "K2": [],
    "K3": [],
    "K4": [],
    "K5": []
   },
   "realized_claims": [
    "P11",
    "P2",
    "P3",
    "P4",
    "P6",
    "P9"
   ],
   "unrealized_claims": [
    "K1",
    "K2",
    "K3",
    "K4",
    "K5",
    "P1",
    "P10",
    "P5",
    "P7",
    "P8"
   ]
  },
  "articulation": {
   "frame": "LDraw, LDU",
   "node_count": 115,
   "origin_scale": 1.0,
   "root_node": null,
   "joints": [
    {
     "id": "L1",
     "label": "hinge locking, groove",
     "type": "revolute",
     "motion": "rotate",
     "axis": [
      -1.0,
      0.0,
      -0.0
     ],
     "origin": [
      16.731,
      -180.509,
      -326.707
     ],
     "range": [
      -0.0,
      2.094395
     ],
     "range_note": "range from a collision sweep of the bricks",
     "exaggerated": false,
     "child_nodes": [
      96,
      97
     ],
     "moves_nodes": [
      96,
      97,
      98,
      99,
      100,
      101,
      102,
      103,
      104
     ],
     "claims": [],
     "depth": 3,
     "connections": [
      "hinge 2/2"
     ],
     "parent_label": "hinge locking, groove",
     "joint_source": "derived from connectors"
    },
    {
     "id": "L7",
     "label": "excavator bucket",
     "type": "revolute",
     "motion": "rotate",
     "axis": [
      1.0,
      0.0,
      -1e-06
     ],
     "origin": [
      16.732,
      -25.616,
      100.461
     ],
     "range": [
      -2.268928,
      0.698132
     ],
     "range_note": "range from a collision sweep of the bricks",
     "exaggerated": false,
     "child_nodes": [
      85
     ],
     "moves_nodes": [
      85
     ],
     "claims": [],
     "depth": 4,
     "connections": [
      "hinge 2/2"
     ],
     "parent_label": "hinge locking",
     "joint_source": "derived from connectors"
    },
    {
     "id": "L8",
     "label": "hinge arm",
     "type": "revolute",
     "motion": "rotate",
     "axis": [
      0.0,
      -1.0,
      -0.0
     ],
     "origin": [
      16.732,
      -76.507,
      -229.22
     ],
     "range": [
      -1.22173,
      1.22173
     ],
     "range_note": "range from a collision sweep of the bricks",
     "exaggerated": false,
     "child_nodes": [
      91
     ],
     "moves_nodes": [
      91,
      92,
      93,
      94,
      95,
      96,
      97,
      98,
      99,
      100,
      101,
      102,
      103,
      104
     ],
     "claims": [],
     "depth": 0,
     "connections": [
      "axle socket/pin"
     ],
     "parent_label": "slope curved, corner",
     "joint_source": "derived from connectors"
    },
    {
     "id": "L9",
     "label": "link bent",
     "type": "revolute",
     "motion": "rotate",
     "axis": [
      -1.0,
      -0.0,
      1e-06
     ],
     "origin": [
      -13.268,
      -82.998,
      -59.21
     ],
     "range": [
      -1.570796,
      0.0
     ],
     "range_note": "range from a collision sweep of the bricks",
     "exaggerated": false,
     "child_nodes": [
      87
     ],
     "moves_nodes": [
      83,
      84,
      85,
      86,
      87
     ],
     "claims": [],
     "depth": 1,
     "connections": [
      "axle socket/pin"
     ],
     "parent_label": "pin friction",
     "joint_source": "derived from connectors"
    },
    {
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