I have a 18 month old B2620 which I love, I have put just over 60 hours on it so far. I have a 54" mid mount mower and today while mowing I noticed a problem, no matter what height position I set the deck to when I lower it the deck always goes to the 2 3/4 setting. If I put it at 4 ....lower the deck the knob will turn to the 2 3/4 mark, set it to 3 1/4 same thing the knob turns to the 2 3/4 mark. Has anyone else experienced this problem or have any idea what is going on. Any help or advice anyone can offer will be very much appreciated. Thanks
Mid Mount Mower Problem
- Thread starter Phila
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Mine stays set and works perfectly.
Just started the last two mowing. Was fine before
I have posted about this before. The design of the height adjustment cam is not great. So when you lower it down it can cause the cam to keep spinning or slipping. There is a thread on how to repair this but I never actually tried that fix. I was having the same problem and my mowing deck would actually drop all the way to the ground while mowing. I replaced the height adjustment assembly and haven't had much slippage since then. But I still do the following to prevent the mowing deck from dropping down while mowing and
First with my left hand on the height adjustment dial I slowly lower the deck until I feel pressure on it. You can prevent it from spinning with your left hand by applying pressure on the height adjustment dial. I then will raise the deck up slightly to take the pressure off the cam and prevent it from lowering while mowing. Last I close the speed adjustment dial so that I'm not even able to lower the mowing deck.
Another thing to mention is that the height adjustment isn't even necessary to mow. You could take it completely off and still be able to mow. You would just have to eyeball the height or actually get off the mower and measure the blade height to know what you are mowing at.
First with my left hand on the height adjustment dial I slowly lower the deck until I feel pressure on it. You can prevent it from spinning with your left hand by applying pressure on the height adjustment dial. I then will raise the deck up slightly to take the pressure off the cam and prevent it from lowering while mowing. Last I close the speed adjustment dial so that I'm not even able to lower the mowing deck.
Another thing to mention is that the height adjustment isn't even necessary to mow. You could take it completely off and still be able to mow. You would just have to eyeball the height or actually get off the mower and measure the blade height to know what you are mowing at.
I am pretty sure that this has just started, I havent noticed before. I did what you said I hold the height adjustment knob while lowering the deck.....sometimes it holds other times it will slip down while mowing. I am sure I could do as you say and eye ball the height of the cut but I feel that as the machine is only eighteen months old and for the amount that the tractor and deck cost it should work properly.
You also have to raise the deck up slightly to take the pressure off. If you slightly open up the speed adjustment knob this will allow it to move up slowly. It shouldn't slip if you do that. I also then close off the speed adjustment knob for added piece of mind.
I found the fix that another person had posted for this. Google the search terms "B2620 MMM height adjustment" Then once in that thread, which is on the tractorbynet forum, under the eighth post there is a link to a PDF of the fix. Hope this helps.
dieseleric
Member
I have the same problem with my B2920 and my 60"mmm. Mine is at the dealer right now for this. Should be interesting what they do to fix the issue. Mine has done this from day one and has 80hrs on it now.
Thank you to everyone for their help with this problem. It certainly sounds as though this is a pretty common problem, Kubota should certainly come up with a TSB to fix this problem. Not the sort of problem I would expect from Kubota based on their overall reputation.
dieseleric
Member
I got mine fixed at the dealer last saturday. The tractor never came with the spring piece of steel with the carrage bolt that goes up against the back side of the cam gear. They put one on it and bam! Instant mower deck fix!!!!
BlueBerryFarmer
Member
My BX2370 wit a 60" mid-mount is doing similar things and the height adjustment hardware is generally hard to use to begin with (poor design that constantly "binds up" / difficult to adjust).......
.........overall, the tractor is very good, but I sure wish they'd have independent hydraulics for the mid-mount and the rear lift arms...........
.........overall, the tractor is very good, but I sure wish they'd have independent hydraulics for the mid-mount and the rear lift arms...........
I saw a very small silver metal piece next to the cam I was wondering if that is what stops it from turning.....it doesn't look very heavy duty. How much did they charge for the fix? Probably the pick up and delivery of the tractor will cost more than the repair.
Thanks
Thanks
dieseleric
Member
They fixed mine for free because it was under warranty
That isn't what keeps it from turning when the weight of the deck is on the Cam. It is the part that allows for the turning of the Cam to the next height setting. Otherwise the Cam would just turn freely without the noticeable clicking you feel/hear between height adjustments.
Just thought I'd share my experience with attempting this fix and see if anyone has any other input about it.
The first part of adding 1/4 inch washer to the base of the CAM I was able to do. I had to widen the hole of a washer I had lying around by boring it on a lathe but simply adding this made the height adjustment shaft and the CAM much more stable.
The second part of using a grinding tool to increase the valleys of the CAM I skipped.
The third part of replacing the flange nut with a lock nut I was unable to do as I am unable to find a proper size lock nut to replace the flange nut .
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Was able to replace the flange nut with a metric hex nut from advanced auto parts which is M10 1.25 and 14mm in width. So I pretty much got the third part of this fix done I just used a lock washer and hex nut rather than the lock nut. If you replace that flange nut it has to be 15mm or less in width or it won't fit up the CAM hole.
If you do decide to fix this yourself it is much easier to work on with the MMM off.
If you do decide to fix this yourself it is much easier to work on with the MMM off.
