SnowRidge
Elite Member
MossRoad said:Excellent job!
Yes, it has that Wow factor. Really nice.
Rip - Your Chipper
- Thread starter woodlandfarms
- Start date
- Views: 6660
Yes, it has that Wow factor. Really nice.
MossRoad
Super Moderator
- Joined
- Aug 31, 2001
- Messages
- 58,084
- Location
- South Bend, Indiana (near)
- Tractor
- Power Trac PT425 2001 Model Year
I've often wondered what size chipper a PT425 could run with its 8GPM@2500PSI rating. I think it works out to something like 11HP.
Rip
Platinum Member
Yeah....this particular model is probably a bit too much for the Green machines. But BearCat also sells the same chipper head with a 13 HP Honda, so not too far off. The next step down from BearCat and others may be just about right.
This model was right at the cross-over point between the manual-feed and power-feed series, and in fact this head is also available with power feed (wish at times I had gotten it).
Most of the PTO shaft-driven chippers are likely to be in this size catagory or above (except perhaps DR). Still, many suitable units around I would guess. Also many self-powered units sitting around with a bad engine. Think eBay, Craigs List, yard sales, etc!
Get some advice from a hydraulic pro regarding the motor.....there are many that will work fine if sized right, but some will be better than others.
Good Luck
This model was right at the cross-over point between the manual-feed and power-feed series, and in fact this head is also available with power feed (wish at times I had gotten it).
Most of the PTO shaft-driven chippers are likely to be in this size catagory or above (except perhaps DR). Still, many suitable units around I would guess. Also many self-powered units sitting around with a bad engine. Think eBay, Craigs List, yard sales, etc!
Get some advice from a hydraulic pro regarding the motor.....there are many that will work fine if sized right, but some will be better than others.
Good Luck
OP
woodlandfarms
Super Member
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- Jul 31, 2006
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- 6,137
- Location
- Los Angeles / SW Washington
- Tractor
- PowerTrac 1850, Kubota RTV x900
Well, the wife is in LA dealing with our kitchen disaster... I sent her a funny conversation in this forum on how to lie to a wife about equipment. Then I dropped her a line on buying a BETST Chipper (they are down the street and claim they upgrade their Jinmas... ) And they have their 6" chipper for $300 less than usual. Funny, she said follow the 3 day rule (If it is the garage unnoticed for three days it is "that old thing and something I bought a long time ago")
Well, you can imagine my excitement. And then the ugly realization that I am going to have to adapt the PT to this device.
Rip, your notes have been fantastic. I wanted to get from the group a couple of things.
I like the idea of direct connecting like RIP did. There seems to be a design issue in the Jinmas on how the system powers from the PTO to the system.
But, I have also pondered the ease of just creating a system that hooks up onto the PTO shaft.
So, first, anyone want to weigh in on this issue?
Also, in Rips desing he put in a bypass valve. As he said his mower does not have one. Do you think I would need to build one?
Carl
Well, you can imagine my excitement. And then the ugly realization that I am going to have to adapt the PT to this device.
Rip, your notes have been fantastic. I wanted to get from the group a couple of things.
I like the idea of direct connecting like RIP did. There seems to be a design issue in the Jinmas on how the system powers from the PTO to the system.
But, I have also pondered the ease of just creating a system that hooks up onto the PTO shaft.
So, first, anyone want to weigh in on this issue?
Also, in Rips desing he put in a bypass valve. As he said his mower does not have one. Do you think I would need to build one?
Carl
OP
woodlandfarms
Super Member
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- Jul 31, 2006
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- 6,137
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- Los Angeles / SW Washington
- Tractor
- PowerTrac 1850, Kubota RTV x900
So, it is 2 AM and I was just sitting around looking at Surplus Center website and I finally figured out what JJ was yacking about with the Tech Support page.
So looking into a 540 RPM moter and a 2000 RPM Motor...
According to the charts. I need a 7.7 CU Inch motor for 540 RPM but it give me 3800 lbs of torque. If I go with the 2" motor for 2000 RPM I get only 1000 lbs of torque. Seems like it is a no brainer that I should stick with a 540RPM.. But there are all the step up belts and such... And loss of energy through that as well...
Anyone want to weigh on the physics of all of this...
So looking into a 540 RPM moter and a 2000 RPM Motor...
According to the charts. I need a 7.7 CU Inch motor for 540 RPM but it give me 3800 lbs of torque. If I go with the 2" motor for 2000 RPM I get only 1000 lbs of torque. Seems like it is a no brainer that I should stick with a 540RPM.. But there are all the step up belts and such... And loss of energy through that as well...
Anyone want to weigh on the physics of all of this...
sawdust_maker
Bronze Member
woodlandfarms said:
Its 20 years since grad school for me, but...
If you then step up this motor using belts to get a delivered 2000 RPM, the torque will drop by a factor of roughly 4. Except, as you point out yourself, for the losses due to the belts and pulleys. There is no free lunch here. So you will end up with less than that. The direct drive motor would be the best option for maximum delivered power, and it already delivers reasonable RPMs, unless you wanted the shock absorbing abilities of a belt drive.
John
J_J
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- Sep 6, 2003
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- JACKSONVILLE, FL
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woodlandfarms said:
Carl,
Why not put this on the PTO shaft and you have another hydraulic source for the chipper.
Surplus Center Item Detail
I didn't understand the 2" motor thing.
OP
woodlandfarms
Super Member
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- Los Angeles / SW Washington
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- PowerTrac 1850, Kubota RTV x900
J_J said:
First, I should have put 2 Cubic Inches..
Second, this is exactly what I was looking for. This said, its specs out a bit low for my appliccation. I have 3100 PSI at 18GPM. Or is that not really a factor in this application. Sorry for the ignorance, just learning...
Carl
Rip
Platinum Member
Carl, Considering the chipper disc itself, you are going to be much more efficient driving it directly rather than through any part of the PTO belt system. The power losses through the additional belts, pulleys and shafts will be significant.
The tractor hydraulic PTO output of nominal 3000 PSI @ 18 GPM is the input you have to work with in sizing the chipper drive motor. You also have a case drain available in the event the selected motor uses one.
I do not have any mower for my PT, but I think the larger ones use a case drain (third hose). I do not know if they use an external bypass valve to allow it to "free-wheel" when the PTO is switch off. On the one hand it may not need it since the mower blades have much lower inertia than the heavy chipper disc, or the PTO valve on the tractor may already take this into account. You could check with Terry. I put it in just-in-case and knew it would not hurt.
I immagine the Jinmas has hydraulic power feed (sort of wish mine did). This can probably be modified to tap off of the main PTO flow, or perhaps use the third aux hydraulic cylinder circuit. With the machine in front of him, a knowledgable hydraulic tech should be able to figure the best solution in 10 minuites. On-line and from a distance, it may be more difficult.
You could ask the folks at the dealer you would be buying the chipper from if they have done similar hyd conversions in the past. There is nothing unique about the PT in this regard.
Or best yet, perhaps they already have a SkidSteer version, which may just need a PT mounting plate instead of the SS type and mating hyd fittings.
The PTO hydraulic pump JJ linked to from Surplus Center is intended to provide an auxilliary hydraulic power source from a tractor PTO shaft when the tractor otherwise does not have an available hyd source. It would not be appropriate for this application.
The tractor hydraulic PTO output of nominal 3000 PSI @ 18 GPM is the input you have to work with in sizing the chipper drive motor. You also have a case drain available in the event the selected motor uses one.
I do not have any mower for my PT, but I think the larger ones use a case drain (third hose). I do not know if they use an external bypass valve to allow it to "free-wheel" when the PTO is switch off. On the one hand it may not need it since the mower blades have much lower inertia than the heavy chipper disc, or the PTO valve on the tractor may already take this into account. You could check with Terry. I put it in just-in-case and knew it would not hurt.
I immagine the Jinmas has hydraulic power feed (sort of wish mine did). This can probably be modified to tap off of the main PTO flow, or perhaps use the third aux hydraulic cylinder circuit. With the machine in front of him, a knowledgable hydraulic tech should be able to figure the best solution in 10 minuites. On-line and from a distance, it may be more difficult.
You could ask the folks at the dealer you would be buying the chipper from if they have done similar hyd conversions in the past. There is nothing unique about the PT in this regard.
Or best yet, perhaps they already have a SkidSteer version, which may just need a PT mounting plate instead of the SS type and mating hyd fittings.
The PTO hydraulic pump JJ linked to from Surplus Center is intended to provide an auxilliary hydraulic power source from a tractor PTO shaft when the tractor otherwise does not have an available hyd source. It would not be appropriate for this application.
Bob999
Platinum Member
I have a 72 inch mower for my 1845. It has a case drain but no external bypass valve.Rip said:
