Go BottomB7100 Loader Pump Specificatios
 | rjnel_1
Join Date: Dec 2009 Posts: 6 MA 
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2010-01-01 167841
Does anyone know how many gpm and psi rating for an early B7100 external front mounted loader pump ?
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada 
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2010-01-02 167848
Before weget to the 'specs' you need to know that almost without exception every set of data you will see is nearly useless since it's lab results from a test bench and it 'real world' figures.
As an example, the hydraulics specs you are looking for will be the results of a pump (undoubtedly tested as a perfect example) with exactly your tractors theoretical maximum horsepower applied to it and measured without any extra plumbing in the circuit. This can never be reproduced in a tractor running in the real world.
Now having said that, 'Bota don't give the breakdown, but your tractor shows as having a dual pump and a total COMBINED output of 8 GPM. I'd say the loader side of it might make 3 or 4 GPM on a good day.
It sounds like you were hoping to use the output for some other use. If so there's other options. Give us some more info, maybe we can help.
Best of luck. ....
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| rjnel_1
Join Date: Dec 2009 Posts: 6 MA
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2010-01-02 167851
No I'm using the on board (motor mounted) pump now and it's slow reacting also my 3 point lift stopped working when I tapped into the hydraulics. I have a Johnson loader on it that was from a Yanmer roughly the same size as the Kubota version would have been back then 1977 so I never had the front mount pump setup and would like to add one. ....
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| Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2010-01-03 167870
I think the problem you have is pretty simple. The loader you have is plumbed wrong. The Yanmar likely had "closed center" hydraulics, Kubota uses "open center" hydraulics. The two, as the names sugggest, are not compatible.
If this is the case just swapping the loader control valve will fix both the speed and 3pth issues. Not expensive nor complicated to do.
Best of luck. ....
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| rjnel_1
Join Date: Dec 2009 Posts: 6 MA
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2010-01-03 167871
I'm familiar with the open vs closed center concept but I thought the flow/pressure restriction of the closed center would not work at all or break the pump ? Closed center stops the flow completely with the control levers in the neutral position correct ? Open center has a constant flow at all times correct ? Were all/most Yanmars closed center ? I did notice that the loader will drop faster in the float position than in the down position which is not normal the pressure should force it down faster correct ?
Thanks your help has been great.
Randy ....
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| Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2010-01-03 167872
Randy, you are correct, in the closed system the pressure side is dead-headed unless you move the valve. However there is a pressure relief valve that will allow flow once the set point is reached.
Your point about the loader not going down well is very telling though. It is possible that the problem is not the open/closed issue. It could justbe misplumbed. The down circuit problem tells me you have pressure on both sides of the cylinder.
You needto retrace all the plumbing between the tractor and the loadr, both pressure and return. Also the 'power beyond' if so equipped.
I still think it's just an incompatible valve though.
Best of luck. ....
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| rjnel_1
Join Date: Dec 2009 Posts: 6 MA
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2010-01-03 167875
I think you may be right but there is one other thing I'd like to run by you. I pulled the return from the top of the transaxle coming from the out side of the valve with the tractor running and the valve levers in neutral position and I'm getting very little flow but here is the puzzling part when I move the levers I would think the return flow would increase or you would get a burst but it doesn't ? I have an inline spin on automotive type filter that came from a garden way loader so I know it was designed for hydraulics. Could a return restriction cause the same problem ? And if so I would think it would try to blow the seal on the filter. ....
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| Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2010-01-03 167884
No, that pretty much cinches it. If you do not have proper flow on the return line then definitely you have a wrong valve or a plumbing issue.
The reduced flow on the return line is IMHO a symptom of pressure on both sides of the cylinder at the same time. If that is the case, then the small flow you are getting is either the difference between the rod and non-rod side of the piston, or the leakage past the seals of the valve, cylinder, or both.
Best of luck
....
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