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jdemaris
11-25-2005 06:13:46
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Re: JD 2440 Cold Starting Provisions in reply to Carl Ernst, 11-25-2005 05:09:11
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The hydraulic systems is the number one issue on Deere tractors when it comes to cold-weather starting. With your tractor, I don't know which pump you have. 2440s have a serial number break where things change. Most 2440s before #340999 use a full size 2.4 cubic inch pump (as do 2030s, 2630s, 300Bs, 2440s, and 2640s). But a few have the little German pumps. I think the later 2440s also use the full-size pump and it's just the drive parts that change. Some early 2440s share parts with the 1020,1520, etc. and have a totally different pump. So, if you have the full size U.S. built pump - i.e. 2.4 cubic inch - it will take the destroker. This sort of pump has a splined driveshaft -and a control housing in front held on by four large bolts (1/2" bolts with a 3/4" wrench head) and its appearance is unmistakeable from the other pumps. If you have the little German pump that comes as a four or eight piston it has a plain round driveshaft with a keyway - and will NOT take a destroker and has a cover held by a bunch of small bolts (metric but close of a 5/16" or 3/8"). Early 2440s share this pump with 1020s, 1520s, etc. Besides having a keyed driveshaft, is also has a large screwdriver slot for an adjustment screw instead of an allen drive. I'm probably making this sound confusing, Anybody that knows Deere equipment could take once glance and know exactly what you have. So, now assuming you've got the full-size pump. These normally destroke themselves when everything is perfect. But, as soon as the tractor has a little wear, they will NOT destroke - and as a result the tractor labors when cranking resulting in poor starting and burnt up starter motors. Deere had/has two fixes. One is an automatic electric destroker and the other manual. The automatic is very exspensive whereas the manual is cheap. It goes like this. The automatic requires a control housing that has a port designed to accept the electric destroking solenoid. Early pumps do NOT have the port and require a kit that includes an entire new housing. Back in the 1980s these kits were $300 and required pump removal to install. At some point in time, Deere started making pumps with the port included - with a plug installed. With these pumps, all you need is the electric solenoid, which can be installed in ten minutes. But, even the solenoid is probably close to a $100 now. This setup hooks to your starter-motor solenoid and engages whenever the starter is cranking. Now - with the manual destroker. During the 1980s, they cost three dollars. You simply remove a little plug from the top of the pump, and put the manual destroker assembly in to replace it. It's a five minute job. Then, whenever you think you need to use it - like in very cold weather, you turn the T-handle in, then start the tractor, then once running, you turn the handle back out so the hydraulics will work. It is a very simple device and can be easily made if necessary.
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