JD2640 Hydraulics question

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JD2640 Hydraulics question

Dennis Nebgen	Brush Hogging today, I noticed my three point lifting real slow and some vibration when lifting. Also it appears to vibrate while in the up position while tractor is idling. Not a constant vibration, it vibrates then stops, then vibrates again. I changed the tranny filter and checked the screen underneath (which was clean). I am now looking in the manual but thought someone here would have some experience and have some ideas as to what to check. Thanks.
Dale G. Basgall	Dennis: Slow hydraulics in comparison to what they would normally run or, slow cycle times can be directly attributed to lack of fluid flow. On the other hand chattering is usually cause by air entering the inlet system of the hydraulic pump. The hydraulic pump on those is a pressure compensated variable displacement radial piston pump and bolted on that pump is a stroke control valve. In cold environments an electric solenoid is used in the stroke control valve so the deisel engine can be rotated with the starter and it de-strokes the pump itself. That o-ring should be replaced and it's easy to do. I would check that out first. The next thing is the noise in the pump at an idle with no functions being used and normaly those pumps clatter when idling and the hydraulic system is operating fine. If it doesn't make the clattering noise it means the pump has not reache system standby and I believe it was 1800psi for those, but look it up, anyway if the pump is not making the noise you probably have a blown o-ring in the control valve to the three point cylinder under the seat. Does the steering get hard to steer when you try to lift up the three point ? Dale G. Basgall
hugo	looks like you have a leak in the hitch cilider
Todd Morawietz	I have the same problem. Im my case the tractor sat for 12 years with the steering shaft cover off and the rain blowing in. After changing the hydraulic oil five times along with cleaning the screen and replacing the filter it will work fine for a while and then the 3-point will start to chatter and then quit. The steering will also come and go. Finally the pto is slipping terribly and that is actually why I am on here looking for an answer.

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