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
