John Deere’s new 9R/9RT Series Tractors feature more horsepower across all models and industry-leading hydraulic capacity in durable, articulated four-wheel-drive and track tractor platforms. These machines were designed for large arable farms with tough field conditions and hillside terrain.

The 9R/9RT Series features five models with wheels (9R) and three tracked models (9RT) to meet any farming need (the last three digits of the model number indicates horsepower): 9420R, 9470R, 9520R, 9570R, 9620R and 9470RT, 9520RT and 9570RT.

The advanced John Deere PowerTech™ PSS 13.5L engines and the 15L Cummins QSX15 engines are all Tier 4 Final/Stage 4 compliant and deliver the reliable horsepower and torque required for increased machine performance. All three engines share a common technology approach to meet the near-zero emissions regulations.
The new and improved e18 PowerShift transmission with Efficiency Manager has been designed to increase machine fluid efficiency and operator productivity. In addition, hydraulic flow has been increased to 435L/min, giving these tractors plenty of capacity to handle large implements with ease.
An industry exclusive feature is the HydraCushionSuspension System on the 9520R, 9570R and 9620R models. Located on the front axle, HydraCushion Suspension mitigates power hop and road lope to ensure operators get all of the horsepower to the ground.
The CommandView™ III Cab provides increased operator comfort and ease of operation with a redesigned CommandARM featuring a John Deere 4600 CommandCenter display for convenient control of tractor functions and settings. This puts everything needed to do the job at the operator's fingertips while sitting in a seat that swivels 40 degrees to reduce strain when viewing rear implements.
The new 9R/9RT Series comes with a new premium LED lighting package for unmatched nighttime work illumination. Optional Active Command Steering, another industry exclusive for four-wheel-drive tractors, provides improved line hold and steering feel at high transportation speeds and reduces steering effort in the field.
Factory integration of the 9R/9RT Series Tractors with the latest technology solutions, along with dealer value-added services and support, is all part of the suite of John Deere FarmSight solutions for customers. It includes AutoTrac, JDLink, iTech, and ISOBUS.
Source: https://www.deere.com/en_INT/our_company/news_and_media/press_releases/2014/oct/jd_new_9r_9rt_tractors_2015.page