The gear box is speed increase gear box to increase tractor PTO speed of 540 RPM to 1800rpm or 2000rpm for generator.  Features include industrial qualityt gears and high alloy steel heat treated shafts in a malleable iron housing. Input shaft is a 6-1 3/8'  spline shaft .Output is severai types: 1,38mm round shaft with 12mm  key ;2,42mm round shaft with 12mm key;3, 19 gear spline hole;  4, 1-1 3/8 ' spline shaft. Antifricition bearings and factory lubrication combine to improve the service life of the unit. The ratios of it is 3.375:1 or3.75:1. The weight of it is 17.5kg.
We can also manufature the produt according to buyer's specifaction.