Bradco 715 front blade attachment
- Thread starter Joekelsch
- Start date
TheOldHokie
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Equipment
L3901/LA525, B7200DT/B1630, G2160/RCK60, G2460/RCK60
You are more than welcome. It was a fun puzzle.
BTW - I think you will find the inlet relief on your valve is set lower than the main relief on the tractor. Thats going to reduce your 3pt lit capacity. I would suggest bumping the valve up to somethung greater than the tractor.
Dan
Russell King
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Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
@TheOldHokie
I couldn’t keep up with the routing of the hoses and what he tested or changed. I also don’t understand what rear remotes were on the tractor.
Would you please sketch what you understand he had hooked up to begin with and then what he ended up with (which I think is just the front blade valve being correctly connected).
What is inlet A on the tractor? What is outlet B on the tractor? Those terms are a bit strange and I just want to be sure I understand what they are correctly.
What is “out” on the valve? Again I “think“ I know but just want to make sure.
I guess a secret decoder list of terms that mean the same things would be good to post as a sticky thread if you think it would be beneficial to many.
I couldn’t keep up with the routing of the hoses and what he tested or changed. I also don’t understand what rear remotes were on the tractor.
Would you please sketch what you understand he had hooked up to begin with and then what he ended up with (which I think is just the front blade valve being correctly connected).
What is inlet A on the tractor? What is outlet B on the tractor? Those terms are a bit strange and I just want to be sure I understand what they are correctly.
What is “out” on the valve? Again I “think“ I know but just want to make sure.
I guess a secret decoder list of terms that mean the same things would be good to post as a sticky thread if you think it would be beneficial to many.
TheOldHokie
Well-known member
Lifetime Member
Equipment
L3901/LA525, B7200DT/B1630, G2160/RCK60, G2460/RCK60
The main problem was lack of documentation for both the valve abd outlet block.
Kubota has historicaly done a poor job with terminology. In this case inlet A is power beyond from the implement and outlet B is pump pressure to implement.
His (and my) first mistake was getting A and B reversed. That was immediatly resolved when he posted a picture of the instruction decal
The OUT on the valve plus rhe two rear couplers was always suspicious. OUT turned out to be tank return and the underside port is power beyond.
Power beyond was going to a rear outlet and deadheaded.
OUT was showing flow because the inlet relief in the valve is set lower than the tractor relief and the deadheaded inlet was unloading to tank (OUT). I knew that was a possubilty when he ran the test but he reported no pump or relief noise so...
As soon as the power beyond was moved to IN on the hydraulic block all was well
Dan
You think this would be worthwhile? Its PoTreeBoy's inside joke. The cover page is all there is right now
Russell King
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Lifetime Member
Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
Yes anything that explains the different ways Kubota has done with hydraulics would be good. I get caught up in thinking they would have done consistent things but they see to change methods over years and in larger tractors.
I think the larger tractors have much more internal piping than the smaller tractors, but that may be an old versus new thing also.
The different terms used are also confusing and I have never found anything that lists the different terms.
I have seen many people hook up the hydraulics incorrectly so a diagram showing the proper flow (in general) would be easy to direct people to instead of having to try and explain it in words.
But I understand that it is difficult to get things into postings and not have an error or confusion.
Thank you for your explanation above, very helpful.
I think the larger tractors have much more internal piping than the smaller tractors, but that may be an old versus new thing also.
The different terms used are also confusing and I have never found anything that lists the different terms.
I have seen many people hook up the hydraulics incorrectly so a diagram showing the proper flow (in general) would be easy to direct people to instead of having to try and explain it in words.
But I understand that it is difficult to get things into postings and not have an error or confusion.
Thank you for your explanation above, very helpful.
There's a knob under the seat. Does that adjust the 3 point lift capacity?
Attachments
There's another decal in the pic. I notice it standing there, but how I angled the phone it came up in the pic.
Attachments
Russell King
Well-known member
Lifetime Member
Equipment
L185F, Modern Ag Competitor 4’ shredder, Rhino tiller, rear dirt scoop
The orange thing is not a knob as far as I can tell. That looks like a fill or a vent.
The label shows what the lowering speed knob looks like and what it does.
It implies that it is only a half turn knob, but that is (probably) not the case. It is like a faucet knob that will take several turns to go from locked stop to fully fast stop.
If it hasn’t been used lately it might be stuck so spray the shaft out of the back with a good penetrating oil if it is stuck. Don’t try to force it too hard, it has a small stem and you can break it off. It may be against the full open stop and you know it is not locked if you can lower the three point arms at a reasonable speed, so turn towards lock first to make sure it moves. Then you can move it both directions to see how many turns are involved.
The label shows what the lowering speed knob looks like and what it does.
It implies that it is only a half turn knob, but that is (probably) not the case. It is like a faucet knob that will take several turns to go from locked stop to fully fast stop.
If it hasn’t been used lately it might be stuck so spray the shaft out of the back with a good penetrating oil if it is stuck. Don’t try to force it too hard, it has a small stem and you can break it off. It may be against the full open stop and you know it is not locked if you can lower the three point arms at a reasonable speed, so turn towards lock first to make sure it moves. Then you can move it both directions to see how many turns are involved.
TheOldHokie
Well-known member
Lifetime Member
Equipment
L3901/LA525, B7200DT/B1630, G2160/RCK60, G2460/RCK60
The knob adjusts the speed at which the lift drops when you move the 3pt control lever to the lower position. It has no effect on lift capacity.
Lift capacity is determined by maximum pump pressure which is set by the relief valve(s). The system relief valve is inside the outlet block and sets the maximum pressure at the outlet (B) port.
Your valve has another relief valve in the valve inlet port that sets the maximum pressure for the valve and it appears to be set lower than the tractor outlet port. That has the effect of lowering the return pressure at the blocke return port (A) and reduces the 3pt lift capacity. You want the valve inlet relief setting to be higher than the tractor outlet setting.
Dan