Backhoe Tracked Excavator

By Paolo Caravani

This model was freely inspired by LIEBHERR R91.

MODEL FEATURES:

• One Hercules motor (Maillot), six reversing movements.
• Basement: Plastic tracks with spring tensioning device and articulated idle rollers.
• Jib, digging arm, and bucket: Stand-alone cord pulley system.
• Transmission:
  • Chain-sprockets with tensioning device.
  • Rubber clutch for arm movements and cab rotation.
  • Gear mesh for hoist and tracks.
  • Coaxial system to transmit track motion through the roller bearing.
• Controls:
  • Five push-pull axle rods located on the back of the cab.
  • Cab rotation through "fake" vertical exhaust tube.

All standard Meccano parts except for co-axial transmission system, using 3 parts from EXACTO large axle system.

Top view of transmission mechanism, through open hinged inspection ports

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