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JD2755 Hydraulic Problem.

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Jim Burns

04-24-2006 15:02:17




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Any help is appreciated in figuring out why and how to fix the front-end loader, JD146, when you want to dump the bucket very slowly, it gets to jerking and jumping rather than a slow, smooth, action. I need to fix this as I use a hay grapple and it needs to be a smooth operation to load hay on the trailer. I've changed the spin-on filter, and the transmission element filter, but no change. The man I bought the tractor from said he had connected the hoses reversed which caused the joystick to be reversed in the load and dump functions, I changed the hoses and the joystick is correct now, but the jerking is still there when I try to dump slow and smooth. The other functions are smooth and not jerky, but I have noticed the power steering not wanting to turn to the right at all at times.
Thanks again.
Jim

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LarrySTN

04-27-2006 20:57:06




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 Re: JD2755 Hydraulic Problem. in reply to Jim Burns, 04-24-2006 15:02:17  
Hey, if the loader lifts smoothly and the roll back is smooth the problem is NOT the oil pick up screen. The problem is mostly likely in the loader control valve.



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Jim Burns

04-28-2006 03:16:09




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 Re: JD2755 Hydraulic Problem. in reply to LarrySTN, 04-27-2006 20:57:06  
Yep.....I guess I'll take it off and get it rebuilt. Thanks!



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HTR

04-25-2006 21:40:12




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 Re: JD2755 Hydraulic Problem. in reply to Jim Burns, 04-24-2006 15:02:17  
I have seen this problem with some loaders. This was where the weight in the bucket would free fall/dump, and then the hydraulics would catch up, and then repeat the action. At any rate the answer was a restrictor orifice, in one or both of the lines to the cylinder/cylinders. I think some of the 146 loaders had a single cylinder in the center of the bucket, that was worse about the problem. If somebody, or dealer digs back far enough, I think there was a service bulletin about this.

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Jim Burns

04-26-2006 04:21:29




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 Re: JD2755 Hydraulic Problem. in reply to HTR, 04-25-2006 21:40:12  
Ok HTR, thanks for the info. That does make sense. Thanks again.
Jim



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daryl kennedy

04-25-2006 20:43:25




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 Re: JD2755 Hydraulic Problem. in reply to Jim Burns, 04-24-2006 15:02:17  
in reading and having pondered this i would say that the problem is in the ram cylinder on the bucket not the tractor

if the tractor was the problem the you should be having the same problem lower the main loader as well



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Jim Burns

04-26-2006 04:24:21




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 Re: JD2755 Hydraulic Problem. in reply to daryl kennedy, 04-25-2006 20:43:25  
Yep....I think so too....HTR refers to an orfice or restrictor valve in the dump line.
Thanks!
Jim



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buickanddeere

04-25-2006 05:32:27




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 Re: JD2755 Hydraulic Problem. in reply to Jim Burns, 04-24-2006 15:02:17  
Is the joystick set for a closed center hydraulic system? The joystick internals may have slop/play or wear which makes metering low flow difficuilt.



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Jim Burns

04-25-2006 17:27:03




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 Re: JD2755 Hydraulic Problem. in reply to buickanddeere, 04-25-2006 05:32:27  
I do not know about the joystick setting, it is a JD 146 Loader and all factory parts, it does well with lift, down, and tilt up only tilt down is jerky. I switched the hoses going from the joystick to the cylinders to make pushing left tilt up and pushing right tilt down and the trouble followed, meaning tilt down is still jerky, making me think the joystick valve probably isn't the problem.



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Tx Jim

04-25-2006 04:07:30




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 Re: JD2755 Hydraulic Problem. in reply to Jim Burns, 04-24-2006 15:02:17  
Jim,does the return oil dump to hyd. oil filter as this will help problem. Have you checked stand-by pressure,it should be 2250 psi but raising to 2400 psi can aid loader functions and won't harm seals. Have you checked sump screen in bottom of tranny? Tx Jim



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Jim Burns

04-25-2006 04:27:49




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 Re: JD2755 Hydraulic Problem. in reply to Tx Jim, 04-25-2006 04:07:30  
Its two hoses go under the tractor and have quick connect couplers on them. I don't know which is return, but one goes into the bottom of the trans. oil filter housing, and the other goes right there by it but not into the filter housing. I haven't checked any pressures, don't have the necessary gauges. I haven't checked the screen, didn't know it had one. I'll find it and check that out. Thanks!

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Tx Jim

04-25-2006 04:45:41




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 Re: JD2755 Hydraulic Problem. in reply to Jim Burns, 04-25-2006 04:27:49  
Jim,the place that JD recomended to get pressure from a utility tractor such as yours is at back of pressure control valve on RH side under platform. To check sump screen you need to drain tranny. Tx Jim



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Jim Burns

04-25-2006 04:51:34




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 Re: JD2755 Hydraulic Problem. in reply to Tx Jim, 04-25-2006 04:45:41  
Ok, thanks. I"ll check that screen, I see it now in the book. You mentioned increasing the pressure. Where is the adjustment screw for that? If the screen cleaning don"t help, I"ll get a gauge set-up and check the pressure. Thanks again!
Jim



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Tx Jim

04-25-2006 04:57:29




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 Re: JD2755 Hydraulic Problem. in reply to Jim Burns, 04-25-2006 04:51:34  
Jim,pressure is controlled by stroke control valve, It is located on bottom of main hyd. pump at front of tractor. Don't attempt to adjust without a gauge. Tx Jim



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Jim Burns

04-25-2006 05:03:12




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 Re: JD2755 Hydraulic Problem. in reply to Tx Jim, 04-25-2006 04:57:29  
Ok, I'll only attempt adjustment if I get appropriate gauge and only as last resort. Thanks!
Jim



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daryl kennedy

04-24-2006 15:10:22




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 Re: JD2755 Hydraulic Problem. in reply to Jim Burns, 04-24-2006 15:02:17  
do you mean that the lifting portion is not jerky?

and you did chk the amount of hydralic fluid is right up there



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Jim Burns

04-24-2006 15:29:52




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 Re: JD2755 Hydraulic Problem. in reply to daryl kennedy, 04-24-2006 15:10:22  
Yep.....the lifting, the lowering, and the tilt up is all smooth and can be operated very slow and smooth, but the tilt down or dump bucket operation is jerky and really dangerously uncontrollable. It will drop completely if you don't get off the stick in time.
Any ideas?
Thanks!
Jim



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Jim Burns

04-24-2006 15:28:31




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 Re: JD2755 Hydraulic Problem. in reply to daryl kennedy, 04-24-2006 15:10:22  
Yep.....the lifting, the lowering, and the tilt up is all smooth and can be operated very slow and smooth, but the tilt down or dump bucket operation is jerky and really dangerously uncontrollable. It will dropp completly if you don't get off the stick in time.
Any ideas?
Thanks!
Jim



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buickanddeere

04-25-2006 19:16:17




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 Re: JD2755 Hydraulic Problem. in reply to Jim Burns, 04-24-2006 15:28:31  
Can you remove the return line from the trans filter. Plug the trans filter port. And return the hydraulic oil back into the trans through the filler hole? Is there a 3rd line which is much smaller, also connected to the control valves? It's a long shot but I've seen cylinder seals on an air operated ram that would seal tight in one direction but pass in the other direction.



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Jim Burns

04-26-2006 04:32:43




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 Re: JD2755 Hydraulic Problem. in reply to buickanddeere, 04-25-2006 19:16:17  
I'll try that. I don't see a third line, only two that go under the tractor, then four that go to the front cylinders, all the same size. I wont have time to work on it again for a day or two, I'll post back with what I find. Thanks all for all the good information. I'm sure I'll find it out with all these good pointers.
Thanks again,
Jim



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cannonball

04-25-2006 05:50:21




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 Re: JD2755 Hydraulic Problem. in reply to Jim Burns, 04-24-2006 15:28:31  
i think you will need a 3/4 allen wrench for pulling the screen on that tractor...and you will loose all the fluid, be sure to check what is on filter you might be having brake problems.. have nice day may god bless



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