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..