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John Deere S series: combines, power and what to check when buying used
John Deere S series — grain combines with straw walkers for medium and large farms, produced since 2011. We look at the main versions, threshing system and what's important to check when buying a used combine.
S series in brief
John Deere S series — conventional combines with straw walkers, designed for harvesting grains, rapeseed, corn (with the appropriate header) and other crops. Model names are indicated by numbers, for example, S650, S670, S680 or S690i.
The higher the number, the higher the class — more powerful engine, larger tank and productivity. Various year models are popular in the used market, so it's crucial to focus on the condition of the specific example.
Which version to choose
Smaller S series combines are suitable for medium-sized farms, while larger ones (S680, S690) are designed for large areas and service providers. Some models are also offered as HillMaster — a version adapted for slopes.
In the case of used combines, engine and threshing drum hours, as well as previous owners' maintenance, are more important than class. Newer models have more advanced automatic matching modes and a more modern cab.
Engines and threshing system
Combines are powered by John Deere PowerTech six-cylinder diesel engines with SCR system and AdBlue. The exact power is indicated by the model class and documentation.
The threshing system consists of a threshing cylinder, concave, and straw walkers. Grain is cleaned with sieves and a fan. Newer models feature automatic combining modes (e.g., Combine Advisor), which help maintain crop quality as conditions change.
What to check when buying a used S series
Ask for the engine and threshing cylinder hour meters. They should match the overall condition of the combine and its service history. Inspect the threshing cylinder and concave: wear should be even.
Check the sieves, fan, grain pan, and belt and chain tension. Ensure the grain tank and unloading auger don’t leak grain.
Test the hydraulics, wheel drives, and cab equipment. Inspect the header (if purchased together) for knife, belt, and conveyor wear.
Versions and series
Names and equipment vary by market and year; we provide a general overview by class.
S650 / S660
First-generation modelsSmaller class combines for medium-sized farms.
- Smaller grain tank
- Often — narrower header
- Lower price
S670 / S680
Mid-range classPopular choice for large and medium-sized farms.
- Greater efficiency
- Often — a wider track
- Often — automatic transmission modes
S690i
A larger classLarge class combis for big farms and service providers.
- Maximum efficiency
- More advanced control system
- More expensive maintenance
S serija HillMaster
By modelA version tailored for slopes with a leveling body.
- Works on slopes
- A more complex construction
- More expensive maintenance
Comparison of S series classes
| S650 / S660 | S670 / S680 | S690i | |
|---|---|---|---|
| Who it's for | For medium-sized farms | For large farms | For large estates and service providers |
| Refinement | Mid-range | More spacious | Most spacious |
| Fuel tank | Smaller | Mid-range | Most spacious |
| Control | Simpler | Extended | Most advanced |
| Price in the used market (relatively) | Mid-range | Top-end | Top-end |
For mid-sized estates, consider the S650 or S660, while for larger plots, opt for the S680 or S690i if the budget allows.
Pros
- High output and good threshing quality
- Advanced automatic combining modes
- Wide availability of parts and services
- Holds its value well
Cons
- High price and expensive maintenance
- Complex electronics in newer models
- Large-class combines need powerful transport equipment
Frequently asked questions
What kind of threshing system does the S series have?
The S series has a traditional threshing system with a threshing cylinder, concave, and straw walkers. It's a simpler and more widely used system, suitable for most crops.
Is the S series suitable for threshing rapeseed?
Yes, the S series is used for both grains and rapeseed, but the header needs to be tailored to the crop. Before buying, check which headers are available.
What is HillMaster?
HillMaster is a version designed for slopes, keeping the cab level while driving uphill. It's useful in hilly regions, but the design is more complex.
Updated 2026-10-21 · Trim levels and equipment vary by market and model year — check the equipment of the specific car. · Translated automatically
