Backhoe BX24 Backhoe and MMM
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DiezNutz
Veteran Member
I can't imagine mowing with the extra weight and bulk of a backhoe hanging out the rear. Can't be as good for the lawn and sure to make trimming inside corners a bear.
Volfandt
Veteran Member
lp333 is correct. The platform of the BH will not allow the 3PH is fully rise and lower which directly effects the MMM. The additonal weight skewers the MMM's optimum cutting level which should have the leading edge just slightly lower than the trailing edge.
There is no disclaimer for this on the BX23 or BX22 btw....
That said, I don't know why one would want the additional 1000 lbs of weight and limited manuverability of mowing with the BH & FEL on. Especially since they are so easy to R&R. Course I'm a firm believer in do'n your own thang and if'n it works for you than mo-pw'r to ya
There is no disclaimer for this on the BX23 or BX22 btw....
That said, I don't know why one would want the additional 1000 lbs of weight and limited manuverability of mowing with the BH & FEL on. Especially since they are so easy to R&R. Course I'm a firm believer in do'n your own thang and if'n it works for you than mo-pw'r to ya
DiezNutz
Veteran Member
Don'tcha mean MOW Power to ya?Volfandt said:...mo-pw'r to ya
On my "big" B it's the situation you describe, where the lift arms will hit under the BH platform. I thought on some of the smaller B/BX models you actually had to remove lift arms to install the BH - no?
Harry c
Gold Member
I've mowed a small area with the BH installed on my BX 24. There was no interference and the mower worked fine. The manual says the BH hydraulic valve can be damaged. My guess is that in some circumstances the use of the 3pt control valve may create a high pressure situation in the return-to-tank line. Most hydraulic valves have a pressure rating for the "P" or pressure port of say 2500 psi and a pressure rating for the "T" or return to tank line of only 500 psi or so. A high pressure spike on this line could conceivably damage the valve. The 3pt system and the BH may share some of the return to tank hydraulic circuit.
With the BH installed you can't use anything else on the 3 pt so it probably is only a concern with the mmm.
Mechanically, I don't see any problem if the hydraulic lines were unhooked from the BH. It is clumsy to mow with the thing on though.
With the BH installed you can't use anything else on the 3 pt so it probably is only a concern with the mmm.
Mechanically, I don't see any problem if the hydraulic lines were unhooked from the BH. It is clumsy to mow with the thing on though.
Volfandt
Veteran Member
You do have to remove the lower lift arms & links. But thats a tool less procedure and very easy. On the BX23 the upper lift arms will hit the BH platform when the 3PH is lowered to it's lowest position but the MMM is probably at the 2" mark when it happens so it's not an issue, unless of course one mows at 2" or less.
There must be a huge difference in the BH spool valve between the earlier BX TLB's and the BX24 in that it needs to be bypassed inorder to run the mid pto. (presumably).
Since the pto(s) are hydraulically accuated the valve may cause too much of a restriction. Just guessing.
Actually, the 3PH, pto, FEL & BH are all on one series circuit. So pressure must flow through all the spools. That is why the BH connections have to be looped back inorder to "close" the circuit when the BH is dismounted. The FEL spool does this automatically. There is a priority valve that splits the hydraulic pressure for the PS circuit which kinda makes it a series/parallel circuit w/the rest of the hydraulic system. Kubota would rather the implement controls fail than the steering
DiezNutz
Veteran Member
Granted it's easy but I thought by doing so you'd have nothing left to lift the MMM either - no? At least that's how it is on the bigger fellas...Volfandt said:
You are correct, Sir. I can't imagine why the BH spools would interfere with the PTO either... who knows...Volfandt said:
What gets stressed if the arms interfere with the BH, is every mechanical component from the 3PH piston to the arms themselves. Basically the same as trying to move an implement that overloads the 3PH; the relief should open. Still alot of stress on the components though, especially if allowed to remain in that state of deadlock.
Volfandt
Veteran Member
On the BX's the MMM's lift arms are connected to the right hand upper 3PH lift arm via an adjustable lift link. Unlike the big fella's, all the linkages for the MMM lift stays put when the MMM is dismounted and doesn't interfere with the 3PH's operation. The MMM's lift links can be locked in the up position and this doesn't interfere w/the 3PH operation either.
I was alittle off on my hydraulic system description, the attachment is the WSM's explaination.
