How to rebuild a Tractor Pulling 4.5ton Sportstractor

That's "the Making off..." our John Deere 4430 from 1972.
We bought that Tractor in France and rebuild it. We tuned him up a bit too for Tractor Pulling. He competes in the 4.5ton Sportscategory.
Specifications original:
6,6l 6 Cylinder Turbocharged engine
125hp
Weight: over 5 tons

The Changes we have done 2007:
Decreased the compression to 14,5:1
Put a Holset HX 50 Turbo on
Flowed Cylinder head
Bigger inlet-valves and stronger springs
Injection:13mm elements in a Bosch A Pump
Combined the pto and drive clutch by welding the two shafts together
Taking all the pto-stuff out wich is not used anymore

Estimated Power: 350hp

Setup 2008:
Rebuilding Clutch
Rebuilding Camshaft
Gearboxwork

Power 2008: 450hp ???

More News: www.tractorpullingzimmerwald.ch

Thanks for your comments...
If there are questions... just ask.

Видео How to rebuild a Tractor Pulling 4.5ton Sportstractor канала Samswiss