8063 Tractor with Trailer is a TECHNICset released in 2009. It contains 1100 pieces to build a large tractor. The tractor was based on a very similar one in 8284 Dune Buggy / Tractor, except with the addition of a few modifications.
This is a description taken from LEGO.com. Do not modify it.
Build a functional tractor with trailer!
This detailed LEGO® Technic model is packed with realistic features and functions! Turn the top gear-wheel to steer the front wheels, then push the tractor forward or backwards to make the pistons in the engine beneath its opening hood move in and out. Turn the back gear to raise or lower the lifting arms, spin the side gear to tip the trailer, and even switch the rotating rear transmission axle on or off!
Tractor features opening hood, turn gear mechanism, moving pistons and more!
Trailer has turn gear tipping function!
Trailer is 15.5" (39cm) long!
Tractor dimensions: 11" (27cm) x 7" (17cm) x 7.5" (19cm)!