The John Deere JS40 walk behind lawnmower is part of the JS range of push lawn mowers that also include the John Deere AS30 as well as the John Deere AS20 push mowers. The engine that powers the JD JS40 is a Briggs and Stratton engine. The max power output from this 4 stroke engine is 7 hp. The engine incorporates a operator presence system which cuts the engine out the moment you let go of the operating handle for safety. This engine powers both the wheels and the mower deck.

The mower deck on the John Deere JS40 has a cutting width of 21 inches which is standard for most residential push lawnmowers. Like on most JD walk behind, self propelled lawnmowers, there is a choice of 3 different options for dealing with the grass clippings after they have been cut on the JD JS40. People who want to leave their lawn looking incredibly neat will tend to use the bagger to collect the clippings and dispose of them away from the lawn. Others will use the optional mulching system to turn the clippings into a mulch that both rots fast and is also highly nutritious. The lazier people will tend to use neither and will simply discharge the clippings out the side of the mower deck.

The rear wheels on the John Deere JS40 are a little bigger, each measuring 9×2 (9 inch diameter, 2 inch width), while the front wheels each measure 8×2 (8 inch diameter, 2 inch width). The cutting height of the mower deck ranges from a high of 4.2 inches above the ground down to a low of 1.2 inches. Adjustments need to be made by the wheels to raise and lower the mower deck.

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