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John Deere Tractors Discussion Forum
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Hydraulic question

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9nrider

12-07-2004 18:43:34




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Looked at a 1983 2440 tonight with a bucket loader. Tractor has 4700 hrs and appeared to be in great shape. Seemed to be a problem with the hydraulics though. The bucket and the 3 point both "chattered" when raised, the bucket would go up fairly smooth at idle but when the revs were raised the bucket raised very slowly, we checked the fluid and added almost 2 gallons of 720 but it did not help. Any thoughts on this, I didn't buy the tractor because I am not that familiar with the hydraulic system. I may go back tomorrow. Any suggestions would be appreciated.

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buickanddeere

12-08-2004 12:45:33




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 Re: Hydraulic question in reply to 9nrider, 12-07-2004 18:43:34  
Try the brakes and see if they grab any. And look for friction material or metal in the trans oil and in the filter. Besides owner/operators never changing the antifreeze and pin holing the sleeves or block. The common way to wreck a tractor is to have somebody who has never read the operators manual. And they have added gear oil to the transmission instead of trans/hydraulic oil. The gear oil softens the pto,brakes and high/low friction material and it flakes/tears off.

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david val

12-08-2004 10:30:07




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 Re: Hydraulic question in reply to 9nrider, 12-07-2004 18:43:34  
usually it's vice versa, chatter at low rpm and no/less chatter at high rpm. cases of the problem you describe were from plenty of impurities (usually brake material) at the transmission bottom. as soon as you raise rpm's, the suction is high around the screen and the screen gets clogged.
david



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cannonball

12-08-2004 06:41:10




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 Re: Hydraulic question in reply to 9nrider, 12-07-2004 18:43:34  
first i think the last year on 2440 was 1982...ok as said below screen, filter, bad transmission pump, power steering leaking, or front pump bad..but make sure that loader return line goes in filter cup..if you work at idle and then race engine up yon may have used up the fluid in small reservior ..a transmission pump pumps about 11 to 13 gals in good condition..your 2440 can have a pump (large pmup) that pumps way more than transmission pump..or can have a smaller pump which pumps about 13 gpm..this is reason that the return line from loader needs to go in filter return..ok one thing i forgot is does it have a high low..you can have leakage there..also the pto brake may be leaking ..if front pump cannot get it..it can't pump it...have nice day may god bless

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Pete/ME

12-08-2004 03:25:17




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 Re: Hydraulic question in reply to 9nrider, 12-07-2004 18:43:34  
Worst case: $500 for a rebuilt hyd. pump. I expect to fix something on a used tractor. All depends on the asking price compared to a new machine of equal size. Had a 2440/145, great machine.



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Jim Presley

12-07-2004 20:29:59




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 Re: Hydraulic question in reply to 9nrider, 12-07-2004 18:43:34  
Loosen one of the hoses to one of the cylinders (don't remove, just loosen). Then put pressure to it. Look for fliud escaping that is white and/or foamy. Water in the lines will do exactly what you describe (chatter/slow movement) and will cause the fluid to be white, and air in the lines will also cause slow movement.

Jim P



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Jim Presley

12-07-2004 23:27:45




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 Re: Hydraulic question in reply to Jim Presley, 12-07-2004 20:29:59  
I should have also said that while water can indeed cause some long term problems, it alone does not mean that the tractor should be a no-go. Any tractor that has sat outside through a winter will accumulate water. I just aquired one that had sat for 6 years, and had a great deal of water in the hydraulic system. Drain it, fill it, run it, then do it again. If the fluid is indeed white, you have water. That should play into the price, and play into how you evaluate the tractor as a whole. If the rest of it is clean, runs OK etc., then you need to make a decision on how much the hydraulic impairment has an impact on the purchase price. Since the hydraulics appear to at least work, that's good. Are the seals on the levers leaking too? If it is just water, and hoses look ok and are not leaking, dry, and cracking, it probably is one to keep (for the right price). It really is up to how you feel about it. If not comfortable, don't do it. If you can get a good price and either are willing to have some work done, or do it yourself, then it's ok too. Very objective, and hard to do with out someone who really knows the equipment. Take your time and buy what you feel good about. Try and find someone who knows that piece as well.

Let us know how you do.

Jim P'

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Spoker

12-07-2004 19:52:31




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 Re: Hydraulic question in reply to 9nrider, 12-07-2004 18:43:34  
Check to see if one of the selective control valves are not in the float postion. This can cause a low hyd. oil pressure It could have dirty filters, a dirty sump screem, or the relief valve might be lifting enough to drop the hyd. pressure. Maybe the pump is week. You really need the pressures checked out on the pump outlet. Of course it has been 25 or so years since I worked on the 40 series tractors.

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