4x4sche
Member
Mine does the same. It is the check valves. If you move it more quickly it won't do this, you can't feather pilot operated valves when there is a lot of load (weight) on the cylinder.
John
John
Hyd. Toplink chattering?
- Thread starter Bob_Young
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N80
Super Member
Jerry, I think he is talking about a Bush Hog brand box blade. But I'm not sure which straps he's referring to either. I have the SBX 720. The mast posts are pretty wide and triangle shaped. They might be stronger if they were gussetted but I don't think these flex. They might, but I haven't seen it. There is a T-shaped 'strap' that comes down from the top of the mast to the back edge of the blade. There are two L-shaped straps at the base of the mast that come back from the front edge of the box to the rear.
3RRL
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N80,
</font><font color="blue" class="small">( They might be stronger if they were gussetted but I don't think these flex. They might, but I haven't seen it.)</font>
Yeah, I know mine dont flex at all. This Howse is completely rigid in it's fabrication.
</font><font color="blue" class="small">( They might be stronger if they were gussetted but I don't think these flex. They might, but I haven't seen it.)</font>
Yeah, I know mine dont flex at all. This Howse is completely rigid in it's fabrication.
greg_g
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My mistake. He was talking boxblade, I was thinking rotary cutter. My BB is rigid as well - just like your photos show. My rotary cutter on the other hand, has long steel straps that flex to compensate for the changing geometry between the toplink and the lift arms.
//greg//
//greg//
N80
Super Member
Wow, I've never seen a BB with hydraulic ripper adjustment. That's almost decadent. /forums/images/graemlins/grin.gif
Is that a full TNT or just a hydraulic top link?
Back to the OP, have you tried changing the top link attachment point on the tractor to see if changing the geometry eliminates the chattering?
Is that a full TNT or just a hydraulic top link?
Back to the OP, have you tried changing the top link attachment point on the tractor to see if changing the geometry eliminates the chattering?
OP
Bob_Young
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Not yet, George; been off the tractor for a couple of days. Might get a chance tomorrow evening. I'll report the results.
Bob
Bob
3RRL
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Not sure that it matters much, but I was taught to use the lower attachment hole on the tractor for ground engaging inplements. I have no quams about trying another location like Greg mentioned (the middle or top hole for me) . As I said above, the groan doesn't concern me enough but I'd like to try the other holes just to eliminate the groan.
N80,
</font><font color="blue" class="small">( Is that a full TNT or just a hydraulic top link?)</font>
I wish...No it's only the top link. I really want to get the tilt cylinder(s) but I've been told they are back ordered to forever?? I thought about buying my own but I want the check valves on the cylinder.
N80,
</font><font color="blue" class="small">( Is that a full TNT or just a hydraulic top link?)</font>
I wish...No it's only the top link. I really want to get the tilt cylinder(s) but I've been told they are back ordered to forever?? I thought about buying my own but I want the check valves on the cylinder.
OP
Bob_Young
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Follow up on the chattering toplink:
Today I moved the hyd. toplink down to the middle set of holes from the top set. I also put the left side 3pt. hitch stabilizer in a 'float' setting to eliminate any chance of binding. After these changes, I still got the 'Groan' noise when the toplink was extended with the BB off the ground.
It did seem, however, that the noise was slightly less and I noticed that if the toplink was extended very slowly, the sound was much 'softer' and not objectionable. On the other hand, extending the link rapidly was almost like blowing a horn. Improvement, if there was any, was small. With BB on the ground, extension & retraction were completely silent as before.
Was going to try the link in the bottom set of holes, but found that the PTO guard interfered with it and so left it in the middle set. Took a look at the Pat's EZ change and couldn't see where there was any binding....the hook's are fairly well aligned with the pins. Might hit 'em with some LPS3 though.
Looks like it's something I'll have to live with. Anyone know whether this will damage the cylinder over time?
Bob
Today I moved the hyd. toplink down to the middle set of holes from the top set. I also put the left side 3pt. hitch stabilizer in a 'float' setting to eliminate any chance of binding. After these changes, I still got the 'Groan' noise when the toplink was extended with the BB off the ground.
It did seem, however, that the noise was slightly less and I noticed that if the toplink was extended very slowly, the sound was much 'softer' and not objectionable. On the other hand, extending the link rapidly was almost like blowing a horn. Improvement, if there was any, was small. With BB on the ground, extension & retraction were completely silent as before.
Was going to try the link in the bottom set of holes, but found that the PTO guard interfered with it and so left it in the middle set. Took a look at the Pat's EZ change and couldn't see where there was any binding....the hook's are fairly well aligned with the pins. Might hit 'em with some LPS3 though.
Looks like it's something I'll have to live with. Anyone know whether this will damage the cylinder over time?
Bob
greg_g
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I assumed - maybe incorrectly - that the outside lever was draft control, the inside lever position control. If that's the case with your tractor, bottoming the inside lever means you're raising/lowering the TPH with the draft control lever. Don't know if that's contributing to the "groan", but it might not hurt to verify which lever is which.Bob_Young said:
Also, I thought the word used before was "chatter ", and chatter is reported as not uncommon if heard coming from the pilot/check valve. But when I hear the words hydraulic and cylinder and groan in the same sentence, bent rod comes to mind. Can you extend the cylinder to the max, and put a straight edge on the rod?
//greg//
4x4sche
Member
The opening pressure of a pilot operated checkvalve depends on the pressure (applied by the load) behind the valve. This is why I said that you can't feather the control when under load without getting a rapid oscillation of the check valve.
