Backhoe major jerky: Back Hoe  -- Tractor Attachments Implements 3ph Discussion Forum and Review Backhoe major jerky: Back Hoe -- Tractor Attachments Implements 3ph Discussion Forum

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 03-09-2005, 14:09 Post: 107664
rpuffd



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 Backhoe major jerky

I have a backhoe that for the most part, works very well. But no matter what speed the engine is running at, the up/down on the boom is always very jerky and fast. Is there any way to adjust this ?, or is there some part that has worn out and needs replacing ? All other movements, left/right, bucket, and the bucket arm work very smooth with no jerky action. It is just the up/down on the main boom. Any advise is welcome and thanks in advance.






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 03-09-2005, 16:08 Post: 107676
Art White



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 Backhoe major jerky

Look for loose lines that might be leaking! If oil can get out it also can let air in! It could be anywhere on the main hydraulic system so don't rule anything out.






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 03-09-2005, 16:43 Post: 107679
rpuffd



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 Backhoe major jerky

Art, I did find a bit of leakage yesterday, but not much. Had to tighten down what appeared to be some kind of adjustmenet on the main valve body. But, it was for the left/right movement which is smooth, and not for the up/down. Tried up/down after tightening anyway and still the same jerky action. I will have a look for other leaks but the valvle body is clean as a whistle. Thanks for the advice.






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 03-09-2005, 22:31 Post: 107698
DRankin



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 Backhoe major jerky

My BX22 spoiled me. My JD 46 hoe is not the same quality.

It does just what you describe, and I have narrowed the problem down to sloppy fitting joints.






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 03-10-2005, 06:59 Post: 107711
rpuffd



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 Backhoe major jerky

This BH is certainly not what I would call a quality unit. I compared it to the BH on my neighbors Kubota and there is no comparison, the Kubota BH is clearly the winner. I will have a look at the joints and replace the bushings if necessary. Thanks for the input.






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 03-10-2005, 19:55 Post: 107748
earthwrks

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 Backhoe major jerky

Have you checked the reservoir fuild level? I have a medium-size dedicated TLB and when (shame on me for not checking) it get's low on fluid that's what is does--it sucks air and the pump cavitates. My hoe's "stick" cylinders are relativley large compared to its other system cylinders and require much more fluid and therefore suck the (unchecked) reservoir clean. My bad. Note to self: Fix leaks in morning.






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 03-10-2005, 21:31 Post: 107762
rpuffd



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 Backhoe major jerky

I did check the resivour fluid level and it was right up there on full and clean as a whistle. I think at this point,I will just have to live with it the way it is. I may be shoping for a better BH soon ! It is very hard to work with in this "jerky" condition. Thanks for the input.






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 03-11-2005, 07:47 Post: 107774
rpuffd



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 Backhoe major jerky

I have remembered one other clue that may be part of the problem. If you park the BH all the way up and dont latch the safety, the main arm(up/down) sinks to the ground by the morning. Would this have anything to do with it being jerky ?, and if so, how does one fix this ? Thanks again.






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 03-11-2005, 07:58 Post: 107775
beagle

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 Backhoe major jerky

Don't know how many hours you have on the BH, but you may have a worn spool in the control valve. This cetainly would explain the drift down, although some of that is normal, but could also expalin the lack of control you have while operating. Pulling the spool isn't a real big job, but does require care. If you aren't confortable with it, take the valve to a hydraulic shop and have them do it.

If you don't have any kinks in the line, faulty quick connects, or leaks, your problem is probably in the valve. If your work ports have load checks, you could also have a bad load check that is sticking and causing the jerky motion, or a worn spool like I mentioned earlier. With the other functions operating fine, I would have the valve section checked. There is an outside chance that the seals in the cylinder are worn, but with the drift down, I would check the valve first. Sounds like a valve problem.






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 03-11-2005, 10:10 Post: 107779
earthwrks

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 Backhoe major jerky

I'm still fuzzy on the term "jerky". A siezed up pivot joint would give that effect if it overcomes being stuck and suddenly releases. My front loader bucket started doing that one day and all of a sudden I went to curl the bucket and the piston rod snapped in two. Siezed pivot.

Also the wrong kind of hydraulic oil will allow the oil to become filled tiny airbubbles (aeration) which causes a loss of pressure and volume in the cylinder not only at the cylinder but at the pump (cavitation). And if you combine that with sticking pivots and seals that are possibly stiff or sticking, all that adds up to pent-up added friction.






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Discussion Boards > Active Subjects > Messages as Posted > Back Hoe Forum

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