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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But it seems to work fine. Pneumatic Jib The jib has two sections, a fixed section and a movable section. Pneumatic Claw A grasping claw legk the end of the jib is driven by one of the new miniature pneumatic actuators. A weighted 2×6 brick is located at the back of the crane to act as a counterweight so that the turntable is reasonably balanced.

While tandem rear wheels would have been nice, there is no way they would have fit into the width of this model. This allows them to be clipped to hooks which makes certain that the hoses move with the boom and jib and do not become tangled. This can be seen clearly in the animation. The color coded computer image shows the way the dual pneumatic cylinders are cross connected. Steering, V-6 engine, dual differentials, pneumatic compressor, slewing cab, luffing boom and jib, grasping claw.

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 color coded computer images can be used to decipher the routing of the hoses in this system, which can then be used to derive the logic of this mechanical computer.

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.

LEGO Technic Air Tech Claw Rig () | eBay

The two cylinder banks have a standard V angle of 90 degrees. The overhead control drives an axle connected to a pair of 14 tooth bevel gears. Because the crank pins are each offset degrees, the forward and back cylinders are synchronized.


A combination of an 8, kego, and another 8 tooth gear pass the torque up without changing the gear ratio or direction. The claws are supported by 3 arms which are free to pivot at the ends. Many of ,ego hoses lsgo pass aft through another beam and up through the center of the turntable for the loader. The actuator attaches almost half way along the length of the boom. Because there is continuous supply of pressure, this model operates very smoothly and multiple functions can even be run concurrently.

Technic “triangles” are used as lugs to attach to the rod end of the actuator. Click for an animation of the boom in motion. The angle of the first section with respect to the boom is about degrees and is locked by triangles and lift arms. For the first time, a 9V battery box was actually integrated into the body of a model instead of being remote. While this allows them to rotate at the same rate, it could make one differential rotate backwards.

Instructions For LEGO 8868 Air Tech Claw Rig

This way, pressure causes one to extend and one to retract simultaneously. Click for an animation of the differentials in motion. It is important to get the two actuators even and centered when rigging the legl to make sure that it can rotate 90 degrees in either direction.

The steering arms may seem small for a model of this size, especially since the weight ,ego the model is cantilevered out the wheels via only a single hole as a support couple. There’s a 9V motor legk under the battery box which drives a large pulley through a belt.

Pneumatic Boom The main boom can be luffed via a single pneumatic cylinder working in compression. A single compressor is integrated into the body. Each pair of pistons shares a common crank pin. Extra length is required when at the centered position. A vertical axle which connects to the 16 tooth gear drives a horizontal axle which passes through the holes in the upper turntable. Why they never used this legl is one of the great mysteries and tragedies of our time.


This serves to make this model pretty heavy. Torque from the differentials passes through lefo long drive shaft to a point under the front of the engine. There are five pneumatic actuators which have ports at the head and rod ends to accept input from the switches.

The second section is movable and is lifted by a single pneumatic actuator driving another pair of triangles.

Reciprocation on this crank gives the compressor cylinder a stroke of 1 stud. The second axle drives a pair of 16 tooth spur gears and then the steering rack via an 8 tooth pinion gear.

The actuators are designed to work in compression during their power stroke. A real hydraulic actuator has significantly less output force in tension than in compression due to the fact that the annular area of the rod end of the cylinder is less than the full bore area of the head end.

Engine The rear wheels are used to drive a V-6 engine. To solve this, the ring gear of the second differential is located on the opposite side. One is on each axle, and one planet gear in the middle allows the axles to turn at different rates. Because all of the other pneumatic hoses have to pass through the center of the turntable along with the driving axle, the crane can only turn so far before the hoses snag.

LEGO Technic Air Tech Claw Rig (8868)

Click for an animation of the steering in motion. 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.

This allows the claw to remain perpendicular to the ground no matter what the jib angle is.