Hydraulic powered pump for concrete mixer

[Lowlysubaruguy]

Thought id update where I am. I suffer from in for a penny in for a pound syndrome. I am in that cement mixer enough money to throw more at it. I have been digging for solutions. I found a hydraulic motor made by dalton first there is no perfect GPM to RPM motor theres a couple that were closer than what I ordered but big money. I ordered one thats 880 RPMs at 13 GPM flow and 2300 PSI. Its reversible which isnt a big plus or minus but I found a cheap pump that wasnt quite as close a fit as this for less money but it is one direction and has two weird inlet and outlet fittings. i could see me racking up $100 in fittings to get it to work then screw it up by accidentally hitting the wrong button on my controls. My logic which may prove a failure is the RPMs I will really need will be around 200 to 350 I dont tink I ever ran the engine RPMs over 1600 when i used it last. So maybe I theres enough flow under 2000 RPMs to get me in the range I want and also keep it out of regen this tractor likes to go into regen under 1500 RPMS any way.

That's what i posted earlier in this thread. Which are the specs I just posted above.

given my flow rate at best will only be half what this is rated at 880 RPMs its max RPMs will be around 400 at rated RPMS on the tractor which i will not need. My biggest concern in reality is if it will be able to start up from a stop with a full load of concrete. Not that I plan on needing that but I can foresee it occurring. All the specs in the world wont change that until I have it put together a a load on it. because there really isnt a motor out there thats got the correct flow rate RPMS and torque for the flow rate my tractor peaks at. Unless you figured out a motor that matches my flow rate RPMS and torque ill need ( which the torque this may need from a dead start full really may not be something anyone can actually calculate accurately unless they have done this exact thing). Im open to any suggestions but U have not found what id call the perfect match.

My hope is its got enough to get a full drum started and keep it in motion the drum really doesn't require much speed at all it will just add a little more mixing time.

 

[TheOldHokie]

Thought id update where I am. I suffer from in for a penny in for a pound syndrome. I am in that cement mixer enough money to throw more at it. I have been digging for solutions. I found a hydraulic motor made by dalton first there is no perfect GPM to RPM motor theres a couple that were closer than what I ordered but big money. I ordered one thats 880 RPMs at 13 GPM flow and 2300 PSI. Its reversible which isnt a big plus or minus but I found a cheap pump that wasnt quite as close a fit as this for less money but it is one direction and has two weird inlet and outlet fittings. i could see me racking up $100 in fittings to get it to work then screw it up by accidentally hitting the wrong button on my controls. My logic which may prove a failure is the RPMs I will really need will be around 200 to 350 I dont tink I ever ran the engine RPMs over 1600 when i used it last. So maybe I theres enough flow under 2000 RPMs to get me in the range I want and also keep it out of regen this tractor likes to go into regen under 1500

Thats what i posted earlier in this post. Which are the specs I just posted above.

given my flow rate at best will only be half what this is rated at 880 RPMs its max RPMs will be around 400 at rated RPMS on the tractor which i will not need. My biggest concern in reality is if it will be able to start up from a stop with a full load of concrete. Not that I plan on needing that but I can foresee it occurring. All the specs in the world wont change that until I have it put together a a load on it. because there really isnt a motor out there thats got the correct flow rate RPMS and torque for the flow rate my tractor peaks at. Unless you figured out a motor that matches my flow rate RPMS and torque ill need ( which the torque this may need from a dead start full really may not be something anyone can actually calculate accurately unless they have done this exact thing). Im open to any suggestions but U have not found what id call the perfect match.

My hope is its got enough to get a full drum started and keep it in motion the drum really doesn't require much speed at all it will just add a little more mixing time.

The motor specs are 3.15 CID That is not 880 RPM @ 13 GPM. At 13 GPM speed is 953 RPM.

This motor will give you 565 RPM @ 7.7 GPM = 2600 engine RPM.

At 1800 engine RPM motor speed drops to 390 RPM

At idle RPM motor speed is ~215 RPM.

That is not a hope, Its a reasonsbly accurate engineering calculation

You have told us repeatedly what you want to achieve speed wise Its simple arithmetic if you pick a speed and stick to it.

The only unknown is the input torque needed to spin the mixer. Your 3.15 CID motor makes a biscuit over 100 lb-ft at tractor opersting pressure of 2600 PSI. Thats another engineering calculation. I have know idea if thats enough to spin a loaded mixer. Thats your only hope.

Dan

 

[hagrid]

It takes little effort to operate that mixer through the existing chain drive.

 

[TheOldHokie]

It takes little effort to operate that mixer through the existing chain drive.

Considerably less the 100 lb-ft would be my guess. Thats based solely on time spent hand cranking a 6qt ice cream freezer

Dan

 

[North Idaho Wolfman]

Considerably less the 100 lb-ft would be my guess. Thats based solely on time spent hand cranking a 6qt ice cream freezer

Dan

OH i remember those days... Arms always wanted to fall off.
Then we got a brand spanking new state off the art electric model, that worked but boy o boy was it loud!

 

[TheOldHokie]

OH i remember those days... Arms always wanted to fall off.
Then we got a brand spanking new state off the art electric model, that worked but boy o boy was it loud!

My dad was a scrawny looking guy but deceptively strong from years of manual farm work. He could and did crank those things for hours. My brother and I would give him a few minutes of rest just so we could clsim we helped. Dad could also polish off a freezer without any help

Dan

 

[PoTreeBoy]

That 100 lb-ft is acting through ~6:1 multiplication, so I don't think OP will be short on torque. Looking at it from a hp perspective, some of the cheap mixers run off a 1/2 hp motor. I'm not going to calculate the hydraulic hp, but I'm pretty sure he's got plenty 'nuff.

When you've got fresh ripe peaches, I've got a sherbet recipe that'll knock your socks off.

 

[TheOldHokie]

That 100 lb-ft is acting through ~6:1 multiplication, so I don't think OP will be short on torque. Looking at it from a hp perspective, some of the cheap mixers run off a 1/2 hp motor. I'm not going to calculate the hydraulic hp, but I'm pretty sure he's got plenty 'nuff.

When you've got fresh ripe peaches, I've got a sherbet recipe that'll knock your socks off.

Yep - 600 lb-ft is muscle car territory and more meaningful than HP.

My peach tree died and while it was alive closely watched for fresh fruit by the bears

Dan

 

[Lowlysubaruguy]

My dad was a scrawny looking guy but deceptively strong from years of manual farm work. He could and did crank those things for hours. My brother and I would give him a few minutes of rest just so we could clsim we helped. Dad could also polish off a freezer without any help

Dan

Rural Wyoming farm kid here the whole clan used to bottle root beer real sarsaparilla ( had to google how to spell that ) hundreds of bottles in all six houses closets basements and cellars when they started popping it was time to make fresh ice cream and I dont think there was one piece of equipment that wasnt 40 years old in the 60s and all required a great deal of effort. Ice cream floats went on for days. Makes me think of rhubarb pie as well.

 

[Lowlysubaruguy]

That 100 lb-ft is acting through ~6:1 multiplication, so I don't think OP will be short on torque. Looking at it from a hp perspective, some of the cheap mixers run off a 1/2 hp motor. I'm not going to calculate the hydraulic hp, but I'm pretty sure he's got plenty 'nuff.

When you've got fresh ripe peaches, I've got a sherbet recipe that'll knock your socks off.

Thanks I think your response might have helped me the most mentally. Ive got all these parts ordered but until I see it make enough power to spin on its own im thinking what if. I was really disappointed with this mixer when I first bought it. Probably because it would have been easier to mix it in a wheel barrow then dig it out of that drum at half tilt. Hopefully I find it does everything I expect it to do.

 

[Lowlysubaruguy]

Finally finished this project. Not sure if I went about it the easy way or hard way. No major fabrication going this route. Which was sourcing a hyd motor that had close enough flow and RPMs ranges, I think this one area I could have gone with a motor that had much higher GPM flow because I am now sure it would have been fine. The one I used had specked 8 to 10 GPM for needs. And its plenty fast. They are cheaper and more common.

The coupler and mount became the biggest headache again the larger motors there seemed to be mounts with the right depth and bolt patterns, this required some enlarging and cutting in all areas. I wanted the motor on the mixers input shaft because rigging up a bracket to run a chain coupler instead looked like more work?

I bought a discounted quick hitch at harbor freight it was $80 and a plate for SSQA off amazon i think a 1/4” would have been plenty. These two allowed me to get the motor and lines a little bit forward of the tractors loader bracket, I removed a large part of the center of the SSQA plate and just welded it all together.

Only real fabrication was bushings and spacers to make the lower side mount pins fairly snug on the three point so it wont bounce around a lot. This might not have been a big deal. I did not weld the three point quick hitch to the mixer so it can easily be removed for service work or repairs. Otherwise I think I could have just welded some bracketry directly to the SSQA plate and not used the three point adapter.

If I can figure out how to load videos here, I will add some of it in motion and show its abilty to completely dump the drum. I think the only thing I would have done different would have been to have tilted the drum more upward before I welded it together as its possibly i might be able to get another bag or two of concrete in it. But really its probably just right.

I have a need for a concrete pad on the back side of one of my shops I may see if I convince a couple of my crew to do the heavy lifting I may know how well it works in a week or two. But it does seem like its going to be very functional. Call it luck but it’s balanced out just about right. With the lower brace where it is when I take it off the tractor it sits with most of its weight on the lower brace wont fall back onto the motor and is easy to load. I was concerned about it wanting to tip on the motor but it wont do that nor does it put much weight on the mixer.

Now for the funny part of all of this. Last weekend our local auction house had its summer auction. In that Auction was a high end skid steer mixer brand new. I didnt watch to see what it went for but I bet it sold for less than what im in top this.