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 11-26-2002, 22:28 Post: 45431
PeterH



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 Sticky Hydraulics

Hi, I have a 2001 JD 4300 with a FEL and 48 backhoe. The tractor has about 125 hours on it now and if I don't use it each week, the FEL controller is VERY stiff for the first few minutes of use. Is this normal or should I be concerned about it? I've also noticed that the FEL seems to have a dead spot in the hydraulics when I tipping the bucket down. It goes so far then won't go any further until I let up on the control and move it to the left again to continue tipping the bucket. Is this common? Thanks. Peter H. Dallas.






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 11-27-2002, 06:33 Post: 45442
TomG

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Hydraulic oil does thin a bit as it warms during initial operation. However, I haven't noticed the valves themselves being harder to work when the oil is cold. My loader don't have joystick linkage so perhaps a linkage could take some warming up or lighter lubricant.

Many loaders do pause in the middle of dumping heavy loads. After the initial tip, the weight of the load tries to dump the bucket faster than the pump can supply oil to the dump sides of the cylinders. When most of the load is dumped, the bucket sits and waits for the pump to catch up. There's a discussion in the archives that discussed details of how it works such as cylinder oil cavitation.

Loaders with fast-dump features don't have this characteristic pause, but they also don't have much curl down power. For that reason most fast dump features can be turned on or off. Generally fast-dumps are turned on by pushing the curl control into a detend position. The JD loader may well have fast dump that would cure the pause. If not, increasing engine rpm reduces it.






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 11-27-2002, 06:34 Post: 45443
Art White



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 Sticky Hydraulics

Peter, I'm not sure what type of valve they are useing on that unit but I don't believe I'd be satisfied with that on that new of a tractor.






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 11-30-2002, 19:13 Post: 45560
jdfan



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 Sticky Hydraulics

I had a 4310 with 430 loader, when I first got it the loader worked fine, what i did not like was that at around 30hours the joystick felt like it was sticking.Say you were lifting something, let go of the stick but the bucket kept traveling.








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 12-14-2002, 03:30 Post: 46105
kadorken



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 Sticky Hydraulics

I noticed a sticky 430 loader at the local dealer when I was trying out the tractors. I attributed it to the cold weather (-5 C) and the fact the tractor was cold. Didn't run it long enough to warm it completely up.

Does your stickiness persist? Any ideas as to cause? (perhaps moisture in the hydraulic oil?)






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 12-14-2002, 06:32 Post: 46110
TomG

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I don't think -5C should affect most hydraulic oil viscosity enough to 'stick' valves even without warming. True enough that I use multi-season hydraulic oil and I don't have joystick linkage, but at -25C I'd describe my valves as sluggish rather than sticky.

Contaminated oil is a possibility and I did seem to cure occasional oddities (could be called sticking) by changing oil. Most control valves have centering springs that could cause centering problems. Poorly fit or scored valve lands also could cause sticking. Of course, if you're very new to tractors, you might not be aware that some valves have detends on both the lift and bucket valves that are supposed to stick.






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 12-15-2002, 04:27 Post: 46133
harvey



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 Sticky Hydraulics

Morning PeterH: My thoughts: Look under the stick cover, there are some ball joints that may need just a small squirk of pentrating oil to loosen them up. It sounds like they free up after you use them some. (You might wanna check your shift linkages also, mine seem to get or stay stiff also usually dust). It is possible for some environmental things to get to them, dust, mud, rain or even leaves. The dumping hesatation is normal, the dump circuit has a two stage valve just a little to the right and it will dump nice and slow all the way down and all the way to the right is a fast circuit. The hesatation is a point just in between them where the load probably does what Tom said, if you start all the way the the rigth it will not or should not hesitate. It will take some getting used to. I still manage to get some hesatitation. I have moved tons of stuff here, (I haul in stone and fill by the tractor trailer load when I need it).






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 12-20-2002, 17:05 Post: 46358
PeterH



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Harvey and everyone else: thanks for all the thoughts on this. This past weekend I managed to spend 5 solid hours on the tractor using the backhoe and FEL to prepare an area for a steel building I bought to house the tractor. And of course, all sorts of other junk. That sticky FEL lever goes away quickly after I've used the tractor for a bit so I'm thinking that Harvey might be on to something. I'll check under that rubber boot and maybe lube the links up a bit. The tractor only has about 140 hours on it and I've had it almost 2 years now. Seems a waste almost but I REFUSE to part with such a nice machine that is so useful when I have the time to work with it.

Had a real scare the other day with it. I took off the tarp I use to cover it and found all these silver shavings all over they cylinders. After catching by breath, I realized it was just the tarp flaking.

Oh, Harvy, I also appreciate the explanation of the dumping hesitation. It makes perfect sense and I'm sure my tractor is behaving perfectly normal now.
Thanks again. Pete






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