Jul
11

John Deere 2000 Series Independent Lifts

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John Deere 2520Here is a topic I have seen some complaining about on other sites; MMM (mid mount mower) independent lifts on the 2000 series machines. The complaint is “My deck won’t stay up unless I keep bumping the up lever”.

Let’s explore the reason you would actually need the independent lift option. The original intent of the design is to use the standard “mechanical lift”. This mechanism is power slaved off the 3pt hitch and does exactly the same thing as the independent lift “it raises the deck” so that you can set the proper cutting height or lock it in the full up position. Now, there may be an application where you want use the 3pt hitch function yet control the deck lift separately. I have just the example. In the fall I attach a trailer vacuum to my 2305’s 3pt hitch that is fed directly from the deck. Well I don’t want the blower and trailer hitch going up and down when I raise and lower the deck. So I added an independent lift to the 2305 and now can raise and lower the deck separately while leaving the 3pt in the full up position. It works great.

There are a couple of issues here that need clarifying.

First off, hydraulic cylinders are not designed to hold applying forces for extended periods of time. The piston seals are not capable of not leaking. In a hydraulic cylinder the seal will always have some kind of leakage or seepage. And with use will get worse and eventually get to the point it will need replacing. Just read the numerous threads out there complaining about their loaders leaking down. The MMM lifts are the same way. To expect the cylinder to hold the deck up for extended lengths of time is unreasonable. Now don’t get me wrong, there are things that Deere can design in to make this happen. The problem is it is not cost effective or practical. The point is the cylinder does exactly as designed; it lifts the deck so that it can be set to the proper height.

Secondly, on the 2305 and the 2320 Deere has designed a very nice device right into the platform of the tractor for controlling the deck cutting height and locking it in the full up position. The 2520 and 2720 have add-on options to set cutting height and full up lock out. When used properly the items work flawlessly. So, enjoy your tractor and always think safety.

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