Hydraulic problem on MMM: Cub Cadet  -- Other Tractor Brands Discussion Forum and Review Hydraulic problem on MMM: Cub Cadet -- Other Tractor Brands Discussion Forum

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 02-21-2002, 16:51 Post: 35783
sbruse
2002-02-21 00:00:00
Post: 35783
 Hydraulic problem on MMM

Hi all. I recently purchased a Cub Cadet 7275 (1995) with FEL and 72 in. MMM. The tractor has about 590 hrs. on it and is in reasonably good condition. I am having a problem with the MMM though. If I raise it up to full height, it drops back down in about 15 minutes to its lowest point. Also, the relief valve (I think) screams the whole time I'm raising it. Problem is, the screaming seems to come from the loader joystick area, and the service manual doesn't say anything about a relief valve here. The front end loader and 3pt stay up fine, and don't cause a screaming relief valve. Any thoughts before I attempt to fix the problem. Thanks in advance!!






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 02-21-2002, 19:08 Post: 35787
Steve in Buffalo NY



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 Hydraulic problem on MMM

My loader valve makes a lot of noise on my 7265 when I use the 3 pt hitch. On those occasions where I have removed the loader and looped the loader hose back to the bypass block the 3 pt is quiet as a mouse. I have the cub 476 loader (which I suspect is really a woods). I had been meaning to ask my dealer about it but keep forgetting....






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 02-21-2002, 21:21 Post: 35788
Roger L.



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 Hydraulic problem on MMM

I don't know about that joystick, but lots of control valves have relief valves built into them. Not uncommon at all. It sounds like your MMM lift mechanism is binding.






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 02-22-2002, 06:13 Post: 35794
TomG

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 Hydraulic problem on MMM

I wonder how the MMM is hooked into the hydraulics. I don't know much about them, but I believe that some use the 3ph for lifting. It sounds like this one has it's own hydraulics, and it would be good to know how it's taped into the system. For example, does it have it's own SCV that runs off a loader SCV power beyond? Is the loader SCV a power beyond type, which would have one inlet and two return lines?

There are a number of possibilities, but more information would be good to help sort it out.






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 02-22-2002, 08:06 Post: 35795
Murf

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 Hydraulic problem on MMM

The screaming you refer to is actually the relief valve opening and closing at an exteremly high rate of speed, something it is NOT designed to do very often, or for very long. If it does this (or has done this) for long the valve will develop (or already has) an internal leak, since you say the MMM will not stay up I suspect this is the case. The diagnosis is a quick easy one, put a pressure gauge in the lift side of the system and lift the MMM to it's maximum hieght and try to keep going, if the gauge doesn't reach at least 1500 psi, or jumps erratically the valve is bad. The culprit is likely just a broken $0.05 spring. Unfortunately the valve needs to be overhauled now, which will cost a little more than $0.05, but not a lot, any hydraulic shop will do it for you. Best of luck.






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 02-22-2002, 08:53 Post: 35799
sbruse
2002-02-22 00:00:00
Post: 35799
 Hydraulic problem on MMM

Thanks for your prompt replies guys. Unfortunately it will be about a week before I have a chance to work on it. I haven't looked at how it is tied in to the hydraulics, but it does run off of its own aux. hydraulics. I don't know much about hydraulics, though I'm sure I'll learn now. Murf, when you say the valve needs to be reconditioned, you mean the relief valve I assume. Is this a relief valve that is added when the aux. hydraulics were added, or does it come with the tractor hydraulic system? Basically, where is it and what does it look like? Thanks again for your help. I'll try to get out soon to look at the tractor and provide more detailed info, but the relief valve sure sounds like the place to start.






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 02-22-2002, 09:08 Post: 35800
Ted @ Abbeywoods Landscape Design
2002-02-22 00:00:00
Post: 35800
 Hydraulic problem on MMM

The FEL on your tractor is in fact made by Woods, that is a good thing. The loader control valve is made for Woods by Danfoss Hydraulics and is not re-buildable, it has an integral pressure relief vale. These valves have been a plague on an otherwise excellent tractor. If you remove the control lever knob, boot, and the sheet metal housing on the side closest to the hood, you'll find the adjuster for the relief valve. Remove the adjustment cap nut, look inside, you'll see an Allen hex head screw. Turn clockwise to increse relief pressure, counter-clockwise to reduce pressure. YOU MUST FOLLOW THE MANUFACTURER"S TEST PROCEDURE TO AVOID INJURY! I don't think this is the full fix, as was previously mentioned, you may also have a binding condition in the rock shaft assembly that lifts the mower, check for this before making any hydraulic adjustments. You will also find a pressure relief valve in the single lever valve that controls the mower lift cylinder. This valve is a royal pain to access without removing the inner fender and seat well sheet metal. Adjustment for this valve is the same as above, as it is for all of the Wood's implements sold for the CC line. For best results, use the pressure test valve as Murph described, your pressure should be 2100 psi, +/- 5 % at normal operating conditions with RPM at 2500. This test valve MUST BE connected on the line that flows from the main hydraulic block to the loader "in" port. Also reference your owner's manual to ensure that the hydraulic block diverter lever is in the proper position, locked with the cap screw, and not just loosely set in place. The cost for a new loader control valve is around $375.00. This job should take an experienced mechanic about three to four hours. Good luck.






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 02-22-2002, 16:20 Post: 35807
MarkS



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 Hydraulic problem on MMM

My experience with the CUbs 72" MMM was a very painful one. I didn't have the Aux hydraulics, mine was raised by the 3pt., but I do know the majority of the mechanisms are the same. If you plan on mowing aneven terrain much plan on purchasing tons of replacemt parts. The linkages were simply underdesigned. From doing some basic strass calculations it appeared to me CUB was only looking at Static loading on the linkage and not Dynamic. my 2c worth. I know it doesn't answer your hydraulic problem though.






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 02-22-2002, 16:47 Post: 35808
Murf

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 Hydraulic problem on MMM

I hate to contradict anyone, especially someone so obviously familiar with this product as Ted is, but, I have had many "Non-rebuildable" items rebuilt, and usually quite succesfully and affordably. That's why I suggested a good hydraulic shop. As an Engineer I can tell you ahydraulic valve is NOT complicated, it is a series of 'O' ringed pistons sliding in chambers which in turns routes fluid into different passages. The usual culprits in the case of failure are 'O' rings and springs. Neither are hard to get, expensive parts. Best of luck.






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 02-22-2002, 16:48 Post: 35809
Murf

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 Hydraulic problem on MMM

Oh, and I forgot, if the MMM is lowering it self the adjustment of the valve will do nothing to cure this problem.






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Discussion Boards > Active Subjects > Messages as Posted > Cub Cadet Forum

Thread 35783 Filter by Poster:
MarkS 1 | Murf 5 | nimscharrer 3 | PJDrew 1 | Roger L. 1 | sbruse 6 | section8 1 | Steve in Buffalo NY 1 | Ted @ Abbeywoods Landscape Design 1 | Ted @ Abbeywoods Landscaping 1 | Ted@Abbeywoods Landscaping 1 | TomG 10 |




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