801 hydr problem-while cutting implement raised full height

Last month I was cutting some fields when all of a sudden the cutter raised full height and the blade was still engaged. No adjustment had been made when this happened and I had been cutting for about 2 hours with no problems. The touch control lever was pushed down with no success. Clutch in, PTO disengaged, control lever moved back and forth resulted in no movement of cutter. After what seems like minutes it finally slowly fell to the ground. This happened once more the same day. Anyone have any idea the reason for this and the cure?[/b]
 
(quoted from post at 14:12:35 07/28/15) Last month I was cutting some fields when all of a sudden the cutter raised full height and the blade was still engaged. No adjustment had been made when this happened and I had been cutting for about 2 hours with no problems. The touch control lever was pushed down with no success. Clutch in, PTO disengaged, control lever moved back and forth resulted in no movement of cutter. After what seems like minutes it finally slowly fell to the ground. This happened once more the same day. Anyone have any idea the reason for this and the cure?[/b]
ny possibility that your top link could have been in compression?
 
The top link used on the cutter is the one I only use for the cutter. Generally I don't have to adjust it at all or if any just a turn or two. Since I don't know what top link compression is, I can't fully answer your question. Please explain.
 
If you look there is a big spring that is hooked to the top link and the lift cover. That spring can cause funny things to happen if it get compressed. Also is the draft/position lever in the position setting?? Could also be a sticking control valve if you have lifted it up and down a couple time and it then stays up
 
(quoted from post at 14:56:13 07/28/15) The top link used on the cutter is the one I only use for the cutter. Generally I don't have to adjust it at all or if any just a turn or two. Since I don't know what top link compression is, I can't fully answer your question. Please explain.
ompression? If you took the cutter end of the top link lose and pulled on it as if trying to stretch it, that would be the opposite of compression, which would be if you pushed on it as if trying to "compress" it & make it shorter.
 
who was in office the last time the hyd oil was changed?

could be hung unloader, that eventually resolved.
 

Yes, the top link spring. The spring is adjusted so that I can turn it with my hand. I believe that is the procedure according to the manual. I just checked it a few minutes ago. I can easily turn it with my hand with friction. The draft/position lever is in the horizontal position. I check that at the site when this occurred in the field.
 
Hydraulic fluid was changed approximately 3 months prior to this happening. The fluid is changed at least once a year. It is checked each time the tractor is used along with all the other fluids except the diff. Trans, maybe twice to 3 times per year.
 
(quoted from post at 15:39:16 07/28/15)
No, that was checked at the time.
ven set to position control, the draft input can still result in lift & that is why I asked you if the cutter/tractor combo could have in any way resulted in putting the top link into compression.......for which I never saw an answer. A second question: is the cutter top link attachment point rigid to cutter or free to move relative to cutter housing?
 
(quoted from post at 20:52:38 07/28/15)
(quoted from post at 15:39:16 07/28/15)
No, that was checked at the time.
ven set to position control, the draft input can still result in lift & that is why I asked you if the cutter/tractor combo could have in any way resulted in putting the top link into compression.......for which I never saw an answer. A second question: is the cutter top link attachment point rigid to cutter or free to move relative to cutter housing?
JMOR
Sorry for not answering. Was trying to answer others question and must have missed that one. If I understand the purpose of the top link spring, it is to dampen out the up/down movement of the implement. The field I was cutting is relatively flat. I don't remember anything that would cause an abrupt upward movement of the cutter and thus compressing the spring. In looking at my shop manual it does look like the main control spring is connected to the draft/position control linkage. I do remember when the cutter was in the up position and I was moving the touch control lever up and down, I did try to move the Draft/Position lever, it was horizontal and would not move easily. (this is the way it always is) The answer to the 2nd question is: it is free. The cutter has a point where the three bars come up from the deck. There are two plates each with two holes. The plates are secured with pins, one at the top of the bars and the other end to the adjustable top link.
 
Sounds like a potential cause of the uncalled for lift is probably ruled out. If enough forward force is applied to the big spring to compress it sufficiently, the linkage connected to it can operate the control valve and result in lifting. I does not appear that this should have happened in your case. As for the POSN/DRAFT small lever being hard to move from position to draft, that is normal, as you are compressing a stiff spring. It will flip back from draft to position mode rather easily & quickly as the same spring is being released.
 
(quoted from post at 22:06:11 07/28/15) Sounds like a potential cause of the uncalled for lift is probably ruled out. If enough forward force is applied to the big spring to compress it sufficiently, the linkage connected to it can operate the control valve and result in lifting. I does not appear that this should have happened in your case. As for the POSN/DRAFT small lever being hard to move from position to draft, that is normal, as you are compressing a stiff spring. It will flip back from draft to position mode rather easily & quickly as the same spring is being released.
Never us the draft position. The P/D lever is hard to move with your hand, but can be done. I have only moved into draft position 5-6 times. After the first couple with my hand, then I used the heel of my boot. Moving it back to position is fairly easy.
So if it did compress the spring and moved the control valve; would that require an adjustment to the Position and Draft linkage?
 
"So if it did compress the spring and moved the control valve; would that require an adjustment to the Position and Draft linkage?" Not unless some part of the linkage was bent. Possible but not likely. It takes a very large top link forward force to be enough to bend something. I expect a sticking valve due to trash/rust/etc. is much more likely. May have cleared itself. Use it & see if you have a repeat.
 
at this point looking at your responses to questions I'm going with a hung valve that cleared.

I'd ditto Jmor. use it and report back.
 
(quoted from post at 13:52:59 07/29/15) at this point looking at your responses to questions I'm going with a hung valve that cleared.

I'd ditto Jmor. use it and report back.

Thank you, I will. I am using it at this time but with a box blade and disk. Have not used the cutter in the last month. That will have to change due to the summer rain and vegetation growth. However, it is still a very unnerving feeling for a implement to all of a sudden rise 4 feet off the ground with a 5 foot blade spinning around. :shock:
 
agreed.

When you hook the cutter up just make sure that the toplink has play, and is not rigid.

if it doesn't repeat, chalk it up to a bit of crud or something hanging the valve .

if it repeats, we can dig back into it.
 

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