Backhoe BH92 Backhoe on my L4240

[shucksters]

Hello Gentlemen- it's been awhile since I posted but this is still my GO TO forum for my 'Botas. I am making my last payment March 1st on the L4240 and my last payment in May on the BX2370..... WOOOHOOO! :cool2:

With that being said, my wife and I have some projects we want to do with frost free horse waterers, stump clearing etc. so I went to my dealer and worked out a deal for a BH92 backhoe with a quick attach 16" bucket today for my L4240 (cab version) with a 9' dig rating. He took good care of me - I got several prices and he was the best at $8800 installed. He also agreed to do my 400 hour service (including the transmission with fluid) for the cost of the parts with no labor charges. Now I have to sit and wait for it to come in at the end of February (patience is not my strong point). It's obviously too late to ask if I got a good deal ;-) but I wanted to see if anyone who has experience with the backhoe has any tips that will save me from feeling sheepish....thanks in advance! Pics to come next month.. Sam

 

[FatTire]

I have the BH92, originally on an MX5100 and now the L5740 cab. Having it around is very useful, and once you learn how it is easy to take on and off. Also I sometimes use it as ballast when I need to lift something near the FEL's capacity. It works much better for that than my 750 lb ballast box.

One tip is that you should not use the tractor's rear remotes while the BH is connected to the Power Beyond port in order to avoid damage to the BH's valve stack. (This might come into play if you use a rear remote to power something up front, like a snow blade, grapple, or auger.) There is a single sentence about this in the BH92 Op Manual, but I didn't see it and learned my lesson the hard way.

 

[shucksters]

I have the BH92, originally on an MX5100 and now the L5740 cab. Having it around is very useful, and once you learn how it is easy to take on and off. Also I sometimes use it as ballast when I need to lift something near the FEL's capacity. It works much better for that than my 750 lb ballast box.

One tip is that you should not use the tractor's rear remotes while the BH is connected to the Power Beyond port in order to avoid damage to the BH's valve stack. (This might come into play if you use a rear remote to power something up front, like a snow blade, grapple, or auger.) There is a single sentence about this in the BH92 Op Manual, but I didn't see it and learned my lesson the hard way.

Thanks for the tip...I will also have to remove the 3 pt hitch when I use it, correct?

 

[dfkrug]

One tip is that you should not use the tractor's rear remotes while the BH is connected to the Power Beyond port in order to avoid damage to the BH's valve stack. (This might come into play if you use a rear remote to power something up front, like a snow blade, grapple, or auger.) There is a single sentence about this in the BH92 Op Manual, but I didn't see it and learned my lesson the hard way.

Hmm. That implies that the OEM PB connection to the hoe is after the FEL valve, and before the IN of the AUX
valve. And the OUT of the hoe valve would be the new IN for the AUX valve. That is not a good setup, due to
the possible back-pressure on the hoe's OUT connection when the AUX valve is used.

Is that what they did?

A safer way for Kubota to use that PB setup would be to bypass the AUX valve and send the hoe OUT to the
tank. It is also easily avoided if the hoe valves had PB, but none seem to have that. Interesting.

 

[FatTire]

Hmm. That implies that the OEM PB connection to the hoe is after the FEL valve, and before the IN of the AUX
valve. And the OUT of the hoe valve would be the new IN for the AUX valve. That is not a good setup, due to
the possible back-pressure on the hoe's OUT connection when the AUX valve is used.

Is that what they did?

A safer way for Kubota to use that PB setup would be to bypass the AUX valve and send the hoe OUT to the
tank. It is also easily avoided if the hoe valves had PB, but none seem to have that. Interesting.

Correct. The BH is connected between the PB outlet on the FEL valve block and the "delivery" port of the tractor's rear hydraulic block. I don't know why they call it the "delivery" port because it is an input. Delivery sounds like output to me. (Someone correct me if I am wrong about this.)

But in any case, this port goes to the Aux Valve block. I never thought about this until I blew out a couple of o-rings in my BH valve block. And sure enough there is a little note about it in the Manual but I'd never noticed it. Nobody seems to know about it, two dealers I talked to didn't seem to recognize the problem until I described it. Likely most people wouldn't be using a rear remote with BH connected but one summer I drilled a bunch of holes with hydraulic auger powered by rear remote while BH was mounted.

 

[FatTire]

Thanks for the tip...I will also have to remove the 3 pt hitch when I use it, correct?

That's correct. You will need 14mm and 17mm wrench/sockets. You will likely get real fast at this too.

 

[dfkrug]

Likely most people wouldn't be using a rear remote with BH connected but one summer
I drilled a bunch of holes with hydraulic auger powered by rear remote while BH was mounted.

Using the AUX valves with hoe attached is common. I use it for running my FEL-mounted mixer, for example,
as well as a hydraulic chainsaw. My PHD, I robbed flow from my bkt curl function. FEL grapples often make
use of the AUX valve, too.

Your's is not a good setup. It is more common for the hoe to be plumbed AFTER the AUX, and before the last
valve in the PB series, the 3-point. This means that you could also blow out your hoe's OUT side
by using the 3-point, but that is hard to do, esp if you are forced to remove the hitch arms.

 

[shucksters]

So as long as I don't power anything other than my FEL while using the hoe, I'm OK...is that the simple answer?

 

[mikester]

Pics please!

 

[dfkrug]

So as long as I don't power anything other than my FEL while using the hoe, I'm
OK...is that the simple answer?

For the most part, yes. If you do decide to put a grapple or 4-in-1 on your FEL, then use a solenoid
diverter, or install a manual spool valve with PB in the series of valves.

 

[shucksters]

For the most part, yes. If you do decide to put a grapple or 4-in-1 on your FEL, then use a solenoid
diverter, or install a manual spool valve with PB in the series of valves.

Got it- that makes sense. Thanks guys! Now I've just got to wait for it to come in....probably end of February...sigh

 

[David_Kb7uns]

The way My GL3130 is done, you unhook the power beyond hose coming from the loader hook up to backhoe and then backhoe dumps into the tank and the rear remotes and three point are unhooked and dead.

Put a WR Long 3rd function solenoid valve on the loader for the grapples.

David

 

[bdhsfz6]

I have the BH92, originally on an MX5100 and now the L5740 cab. Having it around is very useful, and once you learn how it is easy to take on and off. Also I sometimes use it as ballast when I need to lift something near the FEL's capacity. It works much better for that than my 750 lb ballast box.

One tip is that you should not use the tractor's rear remotes while the BH is connected to the Power Beyond port in order to avoid damage to the BH's valve stack. (This might come into play if you use a rear remote to power something up front, like a snow blade, grapple, or auger.) There is a single sentence about this in the BH92 Op Manual, but I didn't see it and learned my lesson the hard way.

Thanks for pointing this out!

The manual for my BH 92 states:

"It is necessary to have the backhoe detached when using rear remotes, the 3 point hitch or any other valves that are downstream of the backhoe valve. Failure to do this may cause the exceeding allowable back pressure to break the seal or case of the backhoe valve."

It seems to me to be a rather poor design when doing something as simple as hitting the 3pt hitch lever by accident can cause damage to the BH valve! It appears even checking the system hydraulic pressure with a gauge from a rear remote with the BH on could cause a problem.

I was planning on converting the mechanical thumb on my BH92 to hydraulic using a rear remote. I guess I'll have to rethink this. I have seen posts here though of others who have done this with no reported problems.

I leave my BH92 on my MX5800 most of the time as ballast when using the FEL bucket or grapple to move heavy material. I assume the 3rd function valve is plumbed ahead of the BH in the hydraulic circuit or I would have broken something by now.

I occasionally use a rear remote to power a tool now and then with the BH installed. So far, I haven't had an issue. It seems to me an easy way to avoid damage when doing this would be to disconnect the BH hydraulic feed hose and reconnect it to the tractor. I don't see why you would have to physically remove the BH from the tractor.

In any case, this is excellent information and thanks for posting!

 

[FatTire]

Thanks for pointing this out!

The manual for my BH 92 states:

"It is necessary to have the backhoe detached when using rear remotes, the 3 point hitch or any other valves that are downstream of the backhoe valve. Failure to do this may cause the exceeding allowable back pressure to break the seal or case of the backhoe valve."

It seems to me to be a rather poor design when doing something as simple as hitting the 3pt hitch lever by accident can cause damage to the BH valve! It appears even checking the system hydraulic pressure with a gauge from a rear remote with the BH on could cause a problem.

I was planning on converting the mechanical thumb on my BH92 to hydraulic using a rear remote. I guess I'll have to rethink this. I have seen posts here though of others who have done this with no reported problems.

I leave my BH92 on my MX5800 most of the time as ballast when using the FEL bucket or grapple to move heavy material. I assume the 3rd function valve is plumbed ahead of the BH in the hydraulic circuit or I would have broken something by now.

I occasionally use a rear remote to power a tool now and then with the BH installed. So far, I haven't had an issue. It seems to me an easy way to avoid damage when doing this would be to disconnect the BH hydraulic feed hose and reconnect it to the tractor. I don't see why you would have to physically remove the BH from the tractor.

In any case, this is excellent information and thanks for posting!

Interesting, the statement in your BH manual provides a quite a bit more detail than mine. Mine was from 2011. When did you buy your backhoe? Yes, now I disconnect the PB from my backhoe when I want to leave it on but won't be using it.

 

[bdhsfz6]

Interesting, the statement in your BH manual provides a quite a bit more detail than mine. Mine was from 2011. When did you buy your backhoe? Yes, now I disconnect the PB from my backhoe when I want to leave it on but won't be using it.

I traded in my BH90 for the BH92 in 2016. The manual is dated 2009 though with code # 7K505-7991-4

For some reason, the serial number written on the manual by the dealer does not match the number on the hoe. It is possible they lost the one for my hoe and gave me this one instead.

 

[FatTire]

I traded in my BH90 for the BH92 in 2016. The manual is dated 2009 though with code # 7K505-7991-4

For some reason, the serial number written on the manual by the dealer does not match the number on the hoe. It is possible they lost the one for my hoe and gave me this one instead.

Then it is the other way, they took info out of the manual. That doesn't seem right, but I'll take a look in my BH manual.

 

[dfkrug]

The way My GL3130 is done, you unhook the power beyond hose coming
from the loader hook up to backhoe and then backhoe dumps into the tank and the rear remotes and three
point are unhooked and dead.

Yeah, that is the way it is usually done to avoid inserting the hoe valve before the AUX valve. I connected
my old L2550 exactly that way. Kubota's industrial machines (like my B21) use a manual diverter valve when
the hoe is connected. Other CUT makers push the hoe user to actually use the AUX valve work ports to
power the hoe, locking the valve on when in use. Not ideal there, either.

IMO, Kubota has screwed up on their newer Grand Ls by not putting the hoe connection after the AUX, or
connecting it one of those other ways above. I will bring it up if I see a factory technical person at next
month's World AG Expo.

 

[shucksters]

Well- talk about under promising and over delivering....my backhoe showed up today at the dealer.. I am taking my tractor in Monday to have it installed.

I'll send a progress report and pics after it's done. Thanks everyone for your advice! I will have an in depth conversation with service about it Monday just to clarify... Sam

 

[shucksters]

Well- here it is in the crate- dropped off the tractor today so will have it back Tuesday or Wednesday....very excited!!!

 

[FatTire]

Well- here it is in the crate- dropped off the tractor today so will have it back Tuesday or Wednesday....very excited!!!

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Looking forward to your report.