Released in , set has the first and only motorized pneumatic find on any LEGO® model, and in fact this is the only set with a motorized compressor. Find great deals for LEGO Technic Air Tech Claw Rig (). Shop with confidence on eBay!. Shop LEGO Technic Air Tech Claw Rig. Free delivery and returns on eligible orders of £20 or more.

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Torque from the differentials passes through a long drive shaft to a point under the front of the engine. To solve this, the ring gear of the second differential is located on the opposite side. The color coded computer image shows the way the dual pneumatic cylinders are cross connected. This allows the claw to remain perpendicular to the ground no matter what the jib angle is. Many of these hoses then pass aft through another beam and up through the center of the turntable for 8688 loader.

There’s a 9V motor mounted under the leyo box which drives a large pulley through a belt.

LEGO Technic Air Tech Claw Rig (8868)

Click for an animation of the jib in motion. Lsgo belt then actually drives the crankshaft of the engine via a pair of pulleys which increase the rotation about 3 times. While tandem rear wheels would have been nice, there is no way they would have fit into the width of this model. Click for an animation of the steering in motion. There is an integral relief valve which prevents the pressure from building above a safe level, although the torque required to drive the compressor to relief pressure slows the motor considerably.


The claws are supported by 3 arms which are free to pivot at the ends.

Air Tech Claw Rig | Brickset: LEGO set guide and database

Differentials The dual rear axles are both “live” and use a pair of differential gears which incorporate a built in 28 tooth ring gear which can work either as a bevel or a spur, similar to the 24 tooth crown gear. The front of the crankshaft uses a 3 blade rotor as a fan. Levo there lrgo continuous supply of pressure, this model operates very smoothly and multiple functions can even be run elgo.

A look at this computer image and those in the above sections will demonstrate that the hose’s path to this actuator is pretty circuitous. Pneumatic Slew By this time, there had been quite a few cranes which featured a slewing turntable, but this is the first time it was controlled pneumatically and it only happened one more time many years later.

A combination of an 8, 24, and another 8 tooth gear pass the torque up without changing the gear ratio or direction.

The steering arms may seem small for legi model of this size, especially since the weight of the model is cantilevered out the wheels via only a single hole as a support couple. Click for an animation of the engine in motion.

A vertical axle which connects to the 16 tooth gear drives a horizontal axle which passes through the holes in the upper turntable. The angle of the first section with respect to the boom is about degrees and is locked by triangles and lift arms. With a compressor, 4 switch valves, 4 large actuators, one small actuator, and four rigid tubes, there are a ldgo of 23 flexible pneumatic hoses to route through this behemoth.


The pressure is split and fed to the inlets of four selector valves switches with two 886 each.

There are five pneumatic actuators which have ports at the head and rod ends to accept input from the switches. Because of the very small area, this actuator has a small output force and the grip of the claw is not very strong, but it does the job.

The second axle drives a pair of 16 tooth spur gears and then the steering rack via an 8 tooth pinion gear. But it seems to work fine.

A pair of rack gears are connected to the actuators and are used to turn a 16 tooth spur gear.


The compressor cylinder itself looks like a small actuator but has a port only at the head end. Steering, V-6 engine, dual differentials, pneumatic compressor, slewing cab, luffing boom and jib, grasping claw.

Click for an animation of the compressor in motion. When driven to retract, it forces air out through the leggo. Click for an animation of the boom in motion. A single compressor is integrated into the body. The smaller arm allows a greater range of motion; in this case almost 90 degrees. The two cylinder banks have a standard V angle of 90 degrees.