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JD4310 - Losing Hydraulic Power

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MacDaddy
Join Date: May 2004
Posts: 95 Western NY
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2006-05-07          129037


I have a JD 4310 that is about a year old (100hrs). I was using the FEL today to move some dirt and noticed that it was really struggling with the weight, and lifting very slowly. I had it fully serviced at about 60hrs. The hydraulic fluid level is also good. Any ideas as to what might be wrong?

Andy

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JD4310 - Losing Hydraulic Power

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Art White
Join Date: Jan 2000
Posts: 6898 Waterville New York
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2006-05-07          129040


Start with a new filter. ....

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JD4310 - Losing Hydraulic Power

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earthwrks
Join Date: Dec 2003
Posts: 3853 Home Office in Flat Rock, Michigan
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2006-05-07          129054


Is the loader operation jerky or erratic, or is it smooth but slow? After you run it for awhile and run the loader up and down under load, take a look at the hydraulic fluid and see if it is clear or has small air bubbles in it. Then report back with your findings. ....

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JD4310 - Losing Hydraulic Power

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Chief
Join Date: Jul 2003
Posts: 4289 Southwest MiddleTennessee
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2006-05-07          129055


I have heard of some dealers skipping over pulling, inspecting, and cleaning the hyd. suction screen. If clogged, it could cause similar problems to a clogged hyd. suction filter. Be sure none of the SCV's are sticking in the open position. This should be very unlikely as you would here the squealing of the bypassing hyd. fluid all the time and the hyd. oil would get hot. ....

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JD4310 - Losing Hydraulic Power

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harvey
Join Date: Sep 2000
Posts: 1544 Moravia, NY
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2006-05-08          129062


What kind of weight? Heavy wet soil? Front tires squat any more than normal? Rear end light? ....

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JD4310 - Losing Hydraulic Power

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MacDaddy
Join Date: May 2004
Posts: 95 Western NY
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2006-05-08          129064


The load was normal. About a half-bucket of very dry soil. Its not jerky... just smooth and slow. I will check the suction screen/filter. How would I inspect for bubbles in the hyd-fluid? ....

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JD4310 - Losing Hydraulic Power

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earthwrks
Join Date: Dec 2003
Posts: 3853 Home Office in Flat Rock, Michigan
TractorPoint Premium Member -- 5 Tractors = Very Frequent Poster  View my Photos  Pics

2006-05-08          129065


There's different ways to check for bubbles: pull the dip stick and inspect the oil on the stick; remove the hyd. filler cap and using a flashlight peer into the tank/reservoir if possible; or with loader full down so you don't get hurt, crack-open one or both lift cylinders and look for aerated oil.

What's the chance you were low on fluid to begin with and operated the loader at a steep angle? If yes, then I feel you starved the pump and permanently damaged it. But this should be easy to check by performimg a pressure test. I wouldn't necessarily take the word from a technician who said he checked it. ....

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