Backhoe questions.

PhatBoy · May 7, 2004

The BH90 looks like a real worker.
I'm concerned the L3430 is not enough for it.

The implement pump is 8.3gpm for the L3130/L3830, 9.4 for the L4330, and 9.8 for the L4630/L5030. The BH90 specs in the brochure are for the L5030.

So do I need a L4630/L5030 to really work it or would another work as well?

Also, the subframe is incompatiable with the midmount mower?

Thank You

5030 · May 7, 2004

If you get a 5030, don't get the cab model. Unless Lubota has changed it mounts, the BH90 won't fit the cab model like I have.

Bradco makes a hoe with just about identical specs to the BH90 the WILL fit the cab model 5030. Actually, I prefer the Bradco over the BH90 /forums/images/graemlins/smile.gif

LarryRB · May 7, 2004

A Kubota delaer near me is mounting Bradco 511, 11 ft hoes, on the 4630/5030 with cabs. If you put the hoe seat back to farthest mounting hole, the top rear of the seat can run against the cab. Nothing significant., but it is that close.

PhatBoy · May 7, 2004

A Bradco 511 would be great.

Question - the spec sheets for the 509 and 511 indicate that 9-12 gpm is optimal. So they work well on the 'botas?

LarryRB · May 7, 2004

I have a Bradco 511 on a Mahindra. I had to go to a PTO 14GPM pump and it has a 15 gallon tank tucked under the rails.Befire the PTO system, it ws next to useless, Mahindras have only a 7.8 GPM main pump. The hoe barely moeved never mind do anything with it.

5030 · May 8, 2004

Larry and other posters:

Ron Kimmer, who is the Bradco rep. Called me about 3 weeks ago and told me that Bradco (ATI) has developed a mounting kit the will space the Bradco hoe AWAY from the rear of the cab on the L series cab models. There are specific part numbers that Bradco will supply to your dealer to accomplish this.

uhmgawa · May 8, 2004

( The BH90 looks like a real worker.
I'm concerned the L3430 is not enough for it. )

I was rather under whelmed by the BH90 as it was in nearly all
aspects a lighter duty backhoe compared to the L4560 which it
reportedly replaced. The current model being sold seems to be
the BH90B. Though it has been a while I recall the original BH90
did not have it's own hydraulic system and ran off the tractor's
hydraulics.

PhatBoy · May 8, 2004

RE: Cab and backhoe

Looking at previous posts I found...

Woods 9000 series works with L5030 cab using mounting kit 1007366

BH90 works with the Curtis Cab

PhatBoy · May 8, 2004

The differences between the BH90 and 509 seem significant as to bucket digging force.

Digging Force - Bucket (lbs) 3871 vs. 5676
Digging Force - Dipper (lbs) 2593 vs. 2754

The reach/depth is about 7" more for the 509 vs the BH90.

Does this difference in bucket force have to do with the flow differences spec'd (9.8 gpm for BH90 on a 5030, 9-12 gpm optimal for 509)?

With either of these can a PTO pump be added later if I am unhappy with the performance and wish for more flow?

uhmgawa · May 9, 2004

( Does this difference in bucket force have to do with the flow differences spec'd (9.8 gpm for BH90 on a 5030, 9-12 gpm optimal for 509)?)

Digging force is a function of system pressure only. The speed at which
you can articulate the backhoe is a function of pump displacement (ie:
GPM). Also digging force increases and cylinder velocity decreases as
cylinder size (cross sectional area) increases.

( With either of these can a PTO pump be added later if I am unhappy with the performance and wish for more flow? )

To my knowledge the BH90B operates via a PTO driven pump.

And yes technically it is quite possible to drive a backhoe originally
intended to operate from tractor hydraulics, via a PTO driven pump.
However in doing so you are creating a separate, self contained hydraulic
system and will need to add a tank, strainer, suction filter, system
relief valve, etc..

Kytractor · May 9, 2004

I have the 509 bradco on my L3830 and it works great. No problems so far after one year.

txdon · May 9, 2004

Phatboy, The BH90 works too well on the 5030. I cannot use it at the rated RPM and have to throttle down my RPM because it moves so quickly, so I think the lower GPM pump would do just fine. The BH90 can lift and pull the 5030 around. The BH90 frame goes along the sides and connects to the FEL and is not compatible with mid mount mowers.

PhatBoy · May 9, 2004

( Digging force is a function of system pressure only. The speed at which you can articulate the backhoe is a function of pump displacement (ie: GPM). Also digging force increases and cylinder velocity decreases as cylinder size (cross sectional area) increases. )

So for a Bradco 509 vs a BH90 on a L5030, the 509 will have 45% more digging force with the bucket (5676 vs. 3871 lbs.)? That is significant.

Implement pump pressure is not listed for the various L30s. I am assuming that it increases as one moves up the model line, but I don't know. I am still uncomfortable with how much harder a subframe mounted BH works on anything over say a L3830. Faster, yes. But more digging force?

( To my knowledge the BH90B operates via a PTO driven pump. )

According to the brochure, the BL4690B 7.5' uses a PTO pump. The BH90 9.0' is operated by the tractor hydraulics. The BH90 I looked at was going into the hydraulics.

Thanks for all the feedback /forums/images/graemlins/smile.gif

PS. LarryRB, if you're still reading this, I understand you are selling your Mahindra with the Bradco 511. Are you replacing it with a Kubota?

uhmgawa · May 9, 2004

( So for a Bradco 509 vs a BH90 on a L5030, the 509 will have 45% more digging force with the bucket (5676 vs. 3871 lbs.)? That is significant.)

The other issue is to determine if there are multiple pin locations
for the bucket linkage . Some mechanisms have a 'power' pin location
which yields increased digging force at the expense of bucket rotation.
If either backhoe has multiple pin locations you may want to
ascertain what 'digging force' is given in which configuration.

( Implement pump pressure is not listed for the various L30s. I am assuming that it increases as one moves up the model line, but I don't know.)

It varies somewhat. However there are practical limitations of using
standardized hydraulic components which have roughly equivalent
working pressures. Most system pressures are in the 2500PSI +/-
ballpark. What you typically find as you compare to larger machines is
a significant increase in pump displacement (GPM).

( According to the brochure, the BL4690B 7.5' uses a PTO pump. The BH90 9.0' is operated by the tractor hydraulics. The BH90 I looked at was going into the hydraulics.)

So it would appear the BH90B [B-version] adds the PTO pump.
Guess it was added for a reason. Both the BL4690A and unfortunately
defunct BL4560 were PTO pump driven.

txdon · May 9, 2004

So for a Bradco 509 vs a BH90 on a L5030, the 509 will have 45% more digging force with the bucket (5676 vs. 3871 lbs.)? That is significant.


That is significant. For every force there is a opposite force and as long as that force can be directed to the ground as in the curl of the bucket under a stump instead of to the tractor, where it would only move the tractor around, it would be useful. /forums/images/graemlins/cool.gif

RayH · May 10, 2004

Ahhh, Someone please tell me that Kubota isnt offering a BH90 with its own hydraulics yet. I juast got a BL4690 for my L3130 because of the self contained hydraulics. I was affraid the GPMs werent enough from the L3130 to operate the BH90 smoothly without running at red line all day.
When I got the BL4690 a few months ago, my dealer said Kubota was looking at adding a pump to the BH90 but it wouldnt be til next year.

Edit: I paniced and had to check Kubotas site real quick. It says the BH90B uses tractor Hydraulics. I think someones got bad info.

uhmgawa · May 10, 2004

( Edit: I paniced and had to check Kubotas site real quick. It says the BH90B uses tractor Hydraulics. I think someones got bad info. )

Sorry to panic you -- my mistake. I just rechecked the page I originally
misread and indeed the BH90B is still driven via tractor hydraulics.

The thing which irked me about the L4650 dying off and the BH90
taking it's place is the sticker price was about the same. Delete the
PTO pump and self-contained hydraulic system and Kubota pockets
the difference. Then again trying to get accurate pricing information
from local dealers is about as effective as using a ouija board to do the
same.

LarryRB · May 10, 2004

Phatboy
I sent you some PM's,, did they go through?

AndyR · May 15, 2004

Daryl - chek out the BH mount pictures I just posted in the "Cabalicious L5030" thread. I don't know what the differences are between the BH90 and the Woods 9000 but the basic idea looks like it would work with minor modifications.