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I was cutting the grass today and I noticed that when I raised the mower deck to the transport position using the SCV, in a short time it would just return to the lowest position. At first I thought i might have jostled the control and I went so far to even lock the SCV valve in place and it still falls. Will drop from the transport position to the set cutting height (I have it set at about 3 inches ) in less than 30 seconds. Any ideas?

I noticed as I hadn't cut the grass in a while (lots of rain) so I wanted to cut it high and then redo it in a couple of days
 

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Unfortunately, its quite normal. The lift cylinder bleeds off quickly so you must use the dial set to the lockup position to hold the deck from falling.
 

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Unfortunately, its quite normal. The lift cylinder bleeds off quickly so you must use the dial set to the lockup position to hold the deck from falling.
Kenny if that's the case can you tell me what's wrong with mine as it never falls. I've left it in the up position for days and it stays right there. So in my case it wouldn't be normal. Is it supposed to bleed off and if so is there something wrong with mine? :confused:
 

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AirCav has hyd lift ,,, guessing you have mechanical lift
 

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AirCav has hyd lift ,,, guessing you have mechanical lift
You're absolutely right etcallhome. So that makes a difference?! Good to know.
 

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You're absolutely right etcallhome. So that makes a difference?! Good to know.
Yes, that's the difference. The SA (single acting) cylinder use to lift the deck in the hydraulic set leaks down badly, not sure why Deere continues them-there are certainly better SA cylinders out there that don't drift like those do.
 

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Hydraulic cylinders aren't Deere's strong point... We had a field cultivar where one side would seep down, especially when it was folded up. All newer ones will seem down over night when left unfolded.

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Yes, that's the difference. The SA (single acting) cylinder use to lift the deck in the hydraulic set leaks down badly, not sure why Deere continues them-there are certainly better SA cylinders out there that don't drift like those do.
I thought that leak down was due to the SCV and not the cylinder itself?


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I thought that leak down was due to the SCV and not the cylinder itself?
Probably a little of both, but in this case since they bleed off so fast I'd say mostly the cylinder is at fault.
 

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Probably a little of both, but in this case since they bleed off so fast I'd say mostly the cylinder is at fault.
Ok. I was just going by what Brian told me when I was asking about top link bleed down (speaking of that I should post a review and video of my top link from him). I am not a hydraulics expert but I try to understand what's happening.


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Deere published this in 2013...


Complaint or Symptom :
Customer complains that the mower deck will not stay in the raised position while transporting from one area to another.

Problem or Situation :
The customer is not using the height of cut knob to set the height of the mower deck, instead they are raising the deck with the hydraulic cylinder and using it to hold the deck in the desired position. The small size of the independent lift cylinder allows the deck to settle faster than the customer expects due to the amount of acceptable leakage in the SCV valve.

Solution :
The independent lift cylinder is not intended to maintain the deck height. Instruct the customer to use the height of cut knob to the select the desired height. This will allow the deck to be maintained at the desired height even when the pressure in the cylinder leaks off.
 
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