Guides

Which guides are there?

• Engine power and power at the PTO are not the same number

  Makers quote engine power; work is done at the shaft. The gap is real, it is not a constant, and on one machine in five it runs the other way.

• A tractor has two weights, and they are thousands of kilos apart

  Unladen mass is what the tractor weighs empty. Permissible maximum is what it may weigh loaded. Mixing them up is how a machine ends up over its own limit.

• Which serial number do I need?

  Tractor, engine, transmission or axle: which serial number answers which question, why the year is not enough, and when a serial gives the year.