John Deere 9770 STS Bullet Rotor combine harvester, Kirovohrad region.

Description of the modelJohn Deere combine harvester 9770STS
The John Deere 9770 STS combine harvester is part of the 9570 STS, 9670 STS, 9770 STS and 9870 STS model series.

Threshing and separation system
This model range of rotary grain harvesting equipment has a unique design feature as the use of a Bullet Rotor type threshing and separation system. Bullet Rotor is literally translated as a bullet rotor. The rotor got this name due to its similarity in shape to a ball, due to the fact that its front part is made in the form of a cone.

This design feature made it possible to reduce the power consumption of the rotor drive by 20% without losing performance. The cone and spiral-shaped plates of the casing evenly distribute the bread mass, which prevents it from clogging even in conditions of crop harvesting with increased humidity. This feature is very important when harvesting corn.(//tractor-service.com)

Threaded rotor blades made of durable materials minimize grain crushing, which in turn increases the quality of harvesting.

It should also be noted that the Bullet Rotor threshing and separation system has reduced the rotor noise level by 20%.

Engine hours:
Engine - 3160 m/h
Separator - 2089 m/h