Agrotrend manual chute conversion

[3400 kubota]

I have a 05 Agrotrend S72 blower with manual chute rotation. I'd like to convert it to hydraulic if I can. It is the cable type rotation w/o a sprocket. I'm thinking of a hydraulic motor connected via lovejoy coupler to the existing crank shaft ( albeit shortened ). What size of pump should I be looking at ? 44 hp at PTO, 8gpm flow . WOuld like to stay away from electric.

Any assistance would be appreciated.

J

 

[TheOldHokie]

I have a 05 Agrotrend S72 blower with manual chute rotation. I'd like to convert it to hydraulic if I can. It is the cable type rotation w/o a sprocket. I'm thinking of a hydraulic motor connected via lovejoy coupler to the existing crank shaft ( albeit shortened ). What size of pump should I be looking at ? 44 hp at PTO, 8gpm flow . WOuld like to stay away from electric.

Any assistance would be appreciated.

J

The simple answer to the motor size question is actually a different question. How much torque does it take to turn the crank?

I see no need for a Lovejoy coupler. Solid sleeve coupler should work fine

Dan

 

[3400 kubota]

The simple answer to the motor size question is actually a different question. How much torque does it take to turn the crank?

I see no need for a Lovejoy coupler. Solid sleeve coupler should work fine

Dan

Was thinking lovejoy as the diameters / alignment may be slightly off. But Thanks for the response I'll check into it.

Any thought on the motor?

 

[TheOldHokie]

Was thinking lovejoy as the diameters / alignment may be slightly off. But Thanks for the response I'll check into it.

Any thought on the motor?

Alignment is a non-issue. Its low RPM and does not need to be rigid.

Tell me how much torque to turn the crank and I will point to a motor..

Dan

 

[ctfjr]

fwiw here is what I did to motorize my chute rotation. The motor was picked up on ebay. iirc it drew <2 amps under load. You can scroll down that thread to see the finished project. Later I added a linear actuator for the discharge chute deflector and a joystick to control everything. Has been working fine. The motor was way overkill for the application. Its been done a lot of different ways. Good luck, fun project.

 

[3400 kubota]

Alignment is a non-issue. Its low RPM and does not need to be rigid.

Tell me how much torque to turn the crank and I will point to a motor..

Dan

I honestly have no idea! I reread my post and I should have said hydraulic pump.
How would I measure hand cranking?

 

[3400 kubota]

fwiw here is what I did to motorize my chute rotation. The motor was picked up on ebay. iirc it drew <2 amps under load. You can scroll down that thread to see the finished project. Later I added a linear actuator for the discharge chute deflector and a joystick to control everything. Has been working fine. The motor was way overkill for the application. Its been done a lot of different ways. Good luck, fun project.

Hi Thanks,
I'm looking for hydraulic not electric.

J

 

[TheOldHokie]

I honestly have no idea! I reread my post and I should have said hydraulic pump.
How would I measure hand cranking?

Measure the force required to turn the crank. You could use a spring scale attached to the handle or hang a bucket from the handle and see how much weight you need to put in the bucket to cause thd handle to turn. We aint building a Mars lander - all we need is a ballpark figure.

Dan

 

[mikester]

I have a 05 Agrotrend S72 blower with manual chute rotation. I'd like to convert it to hydraulic if I can. It is the cable type rotation w/o a sprocket. I'm thinking of a hydraulic motor connected via lovejoy coupler to the existing crank shaft ( albeit shortened ). What size of pump should I be looking at ? 44 hp at PTO, 8gpm flow . WOuld like to stay away from electric.

Any assistance would be appreciated.

J

I just used a shortened shaft on the turner mechanism and a lovejoy coupler on a small hydraulic motor. If you don't have a motor you can size it based on your tractor flow rate and desired motor shaft rpm.

I'm not sure what you mean by "size of pump" your tractor probably has a port for adding remotes. Cheaper than adding a PTO pump.

 

[3400 kubota]

I just used a shortened shaft on the turner mechanism and a lovejoy coupler on a small hydraulic motor. If you don't have a motor you can size it based on your tractor flow rate and desired motor shaft rpm.

I'm not sure what you mean by "size of pump" your tractor probably has a port for adding remotes. Cheaper than adding a PTO pump.

Yes, wrong choice of words. I have 2 rear remotes, 1 detente for the backhoe and one spring center I believe . 7.66 gpm for implements.

 

[GreensvilleJay]

You've got 2 unknowns
1) force need to turn the chute,probably not much
2) speed to turn the chute,gotta be SLOW !

probably 'any' motor will have the torque (force) to turn the chute but you'll need 'flow restrictors' to slooow down the rotation

yes, it can be calculated, some online apps, but you'll need to know what GPM and PSI you can supply to figure out motor specs....

the 'cheat.....' ,find out what motor others use....

 

[3400 kubota]

You've got 2 unknowns
1) force need to turn the chute,probably not much
2) speed to turn the chute,gotta be SLOW !

probably 'any' motor will have the torque (force) to turn the chute but you'll need 'flow restrictors' to slooow down the rotation

yes, it can be calculated, some online apps, but you'll need to know what GPM and PSI you can supply to figure out motor specs....

the 'cheat.....' ,find out what motor others use....

From what I can get it's 7.66 gpm and relief valve set at 2489 psi.

I did try to measure the force required to move the chute manually. It was very little as its lubed pretty well. Not much more than a few pounds .

 

[TheOldHokie]

From what I can get it's 7.66 gpm and relief valve set at 2489 psi.

I did try to measure the force required to move the chute manually. It was very little as its lubed pretty well. Not much more than a few pounds .

There was never a question of having enough hydrsulics to run the motor and a few lb-ft of torque is nothing.

Just about any motor is going to turn the crank. Your issue is going to be speed and matching the shaft diameters. It needs to run as slow as possible so bigger is better. Another option is to put a flow restrictor in the line to slow things down.

Dan