Building Toys – Hydraulic Excavator for Boys Age 8-12, Construction Truck with Bulldozer and Crane Replacement, Science Projects Engineering Vehicle Kits, Kids Gift for Birthday, Christmas

About This Product :

• Are you looking for a new STEM project for your 8-12 yr old kids? This STEM building project can help children stimulate their imagination and creativity, improve collaboration and teamwork skills, and develop logical thinking and problem-solving skills.
• The hydraulic excavator don”t need a battery and motor, just water can drive your robot arm.The pressure of water is converted into power,so that the operating lever can easily control various joint activities of the mechanical arm.
• Hydraulic toy has three replacement parts: excavators, bulldozers, cranes. Give full play to kids imagination and feel the fun brought by the hydraulic construction toys. (The maximum lifting capacity of excavators and bulldozers is 40g. Because the crane is loaded with three gears in the design structure, the friction force is large, and the capacity is only less than 5g.)
• It only takes a cup full of water to complete the build, and you have a huge range of movement in your hydraulic arm. It”s a great way to learn about how to transfer power and use hydraulics to do some quite complex actions. A definite science and engineering win.
• The hydraulic toy consists of 167 components, and a detailed installation manual is provided in the package, and you can scan the QR code on the package to view the electronic version of the manual and installation video. Tips: Remove all air bubbles like when filling water in hydraulic lines.