how to make hydraulic dump truck working model using syringes

Creating a hydraulic dump truck working model using syringes is a great way to demonstrate the principles of hydraulics and mechanical advantage.

Here’s a step-by-step guide:

Materials Needed:

  1. Cardboard or sturdy base
  2. Small cardboard box (to represent the dump truck body)
  3. Wooden sticks or dowels
  4. Large syringes (at least 3)
  5. Plastic tubing
  6. Hot glue gun or strong adhesive
  7. Utility knife or scissors
  8. Marker
  9. Small plastic container or cup
  10. Optional: Small toy trucks or models for decoration

Steps by Steps Video Instructions:

hydraulic dump truck working model

1. Prepare the Base:

  • Start by creating a sturdy base using cardboard or any other suitable material.
  • This will serve as the foundation for your dump truck model.

2. Build the Dump Truck Body:

  • Construct a simple box shape using cardboard to represent the dump truck body.
  • Cut out the top and front of the box to create an opening for dumping materials.

3. Create the Hydraulic System:

  • Cut two small holes in the bottom of the dump truck body, towards the back.
  • Insert the nozzles of two syringes into these holes, pointing towards the ground. These syringes will act as the hydraulic pistons for lifting the dump truck bed.
  • Attach plastic tubing to the syringes to create a closed hydraulic system.
  • Connect the tubing from one syringe to the other, creating a loop.

4. Attach the Control Syringe:

  • Cut another hole in the side of the dump truck body.
  • Insert the nozzle of the third syringe into this hole. This syringe will serve as the control mechanism for raising and lowering the dump truck bed.

5. Connect the Control Syringe:

  • Attach plastic tubing to the control syringe.
  • Connect the tubing from the control syringe to the tubing loop between the two lifting syringes.

6. Assemble and Test:

  • Secure all syringes and tubing in place using hot glue or strong adhesive.
  • Decorate the dump truck body as desired.
  • To operate the dump truck, pull the plunger of the control syringe to pump fluid into the lifting syringes, raising the dump truck bed. Push the plunger to lower the bed.


  • When the plunger of the control syringe is pulled, fluid (water or air) is forced into the lifting syringes, causing their pistons to extend.
  • This extends the pistons attached to the dump truck bed, lifting it up and tipping the contents out of the truck, simulating a dump truck in action.

By following these steps, you can create a simple yet effective hydraulic dump truck working model using syringes for a science exhibition. It’s a great way to demonstrate the power of hydraulics in action!

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