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  1. #1
    Elite Member dfkrug's Avatar
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    Default converting a 3-pt concrete mixer from PTO to hydraulic drive

    Over the next few days, I will be posting the process I went through to
    convert my Mixer80 3-pt concrete mixer from PTO drive to hydraulic drive.
    I am posting this in the Hydraulics forum because it illustrates what's
    involved in the conversion of potentially ANY PTO-driven implement.

    First question: why make this conversion? Several reasons:

    > hydraulic drive is reversible. This is particularly valuable with post hole
    diggers, but also gives advantages to mixers. If you can reverse the
    direction of a mixer, you can use the rotation (in combo with the right kinds
    of flutes) to unload the drum. This is how commercial readimix trucks work.

    > hydraulic drive allows you to put implements requiring rotational power
    on the front of your tractor. This is obviously better for a brush or snow
    blower, but it also means you can dedicate the rear of your tractor to an
    implement you do not want to remove. For me, it is my backhoe, which
    is tedious to remove and provides ideal ballast.

    > there are other more minor advantages like safety...no open spinning
    driveshafts

    ***

    Anyway, the first 4 photos show my mixer as it is originally configured.
    There is a tiny drive sprocket (2nd photo) and 40 guage chain, which drives
    a gigantic sprocket with 114 teeth (4th photo). I used my FEL to pull this
    thing apart. I have mixed scores of yards of concrete and stucco over the
    past 10 years, and I always lube the chain with m/c aerosol chain lube.
    Despite that, the drive spocket was pretty badly worn. :-(
    Attached Thumbnails Attached Thumbnails converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_1.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_2.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_3.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_4.jpg  
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  2. #2
    Elite Member dfkrug's Avatar
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    Default Re: converting a 3-pt concrete mixer from PTO to hydraulic drive

    OK, now I need to get a hydraulic motor.

    To choose a motor, you need to decide what volume and torque you need.
    My operating conditions will be a final drum RPM of about 30 for the slowest
    speed. At idle, my tractor will be putting out about 2GPM, and my torque
    requirements should be quite low, well below any motor I see commonly
    available. (This is primarily due to the multiplication of torque I get with
    my chain drive.) I do not expect to need the full 2500 psi of my implement
    pump.

    So, I decided to buy a motor that was between 7 and 12 cubic inches/rev.
    I could just go to SurplusCenter and pay $150, but I know there are hundreds
    of new motors on eBay for far less. The problem with eBay listings is that
    the seller usually has no idea what he has....displacement, torque, shaft
    size, etc. So you try to find his motor in a manufacturer catalog, based on
    a part #, or serial number. I figured that if I was patient, I would find a
    new motor that met my needs for less than $100. I would then choose my
    drive sprocket and shaft adapter based on what I could buy. After a few
    months of looking I landed a 7 GPM White roller-stator motor for about $65,
    and it had a straight 1" shaft (first photo). That allows me to use 1" DOM
    tubing instead of buying spline adapters or woodruff key adapters. Cool!

    I next bought a drive sprocket from SS...a very nice one that is twice as
    thick as the worn out one the mixer came with. The hole in the sprocket is
    about 1.75", so I will have do some creative welding (2nd photo).

    Ever wonder what it looks like inside these motors? See the 3rd photo.
    Attached Thumbnails Attached Thumbnails converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_5.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_7.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_6.jpg  
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  3. #3
    bjr
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    Default Re: converting a 3-pt concrete mixer from PTO to hydraulic drive

    I studied doing that. I just can't play with the big kids on that (too much money). The valves , motor type valve vs cylinder valves, some kind of flow divider, hoses, fittings, and possibly a oil cooler. Then build mounts and accurate bolts hole pattern for the flanges. I'll be watching for the results. I'm not a critic, but just a guy that knows his limits on money and time and I do wish you luck. Are you going to mount the mixer unit on the front of the Tractor? I see you wrote you did not like removing the backhoe. I wound up rebuliding a old stationary type 6 cu ft unit to mount 3 pt on the back of my tractor with a home built PTO shaft and belt pulley reduction. I've not actually mixed cement with it yet, just some rocks and dirt mud to see if it wood spin and then dump okay and it looks like it might work, we'll see. bjr

  4. #4
    Elite Member dfkrug's Avatar
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    Default Re: converting a 3-pt concrete mixer from PTO to hydraulic drive

    Quote Originally Posted by bjr View Post
    The valves , motor type valve vs cylinder valves, some kind of flow divider, hoses, fittings, and possibly a oil cooler.
    Well, BJR, I am jumping the gun, but here is my Bill of Materials:

    > White Hydraulic Motor, 6.7 ci, 2000psi, $75 shipped
    > drive sprocket, < $10
    > two 15' hoses w/ JIC ends, 1/4", $65
    > hydraulic adapters and QDs, $40
    > 1/4" steel plate (scrap)
    > 2" of 1" ID DOM tubing (about $1/inch in 12" quantities)
    > #40 chain master links, $3
    > misc bolts/nuts (stock)

    I used my existing rear AUX spool valve on the tractor. You do not need
    any special valve or diverter. My tractor is HST, so it has an oil cooler
    already.

    With respect to motor control valves, you don't really need those unless the
    object you are turning with your motor had a lot of momentum. This will
    cause a lot of back pressure when a conventional spool valve is suddenly
    closed, as when hyd motors are used as vehicle drive motors. This is not an
    issue for my mixer or for hyd post hole diggers.
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  5. #5
    Elite Member dfkrug's Avatar
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    05 Kioti CK30HST w/ Prairie Dog backhoe

    Default Re: converting a 3-pt concrete mixer from PTO to hydraulic drive

    Now I need to get my sprocket centered on my DOM tubing. This does
    not have to be perfect, since this is a very low speed chain drive.

    First, I welded some nubs onto the tubing (photo #1), then I cut them
    down a bit on the lathe (#2) to achieve a snug fit on the sprocket (#3).
    I had to open up the bore a few thousanths so it would fit on the 1.000"
    shaft. Now I am ready for welding the sprocket on.
    Attached Thumbnails Attached Thumbnails converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_8.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_9.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_10.jpg  
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  6. #6
    Elite Member dfkrug's Avatar
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    Default Re: converting a 3-pt concrete mixer from PTO to hydraulic drive

    Before I weld up the sprocket, I need to make sure that it will be in the
    same plane as the driven sprocket. So next, I will mount the motor.

    I grabbed some 1/4" plate from the scrap pile (I have lots of scrap) and
    cut out a central hole with my plasma cutter. My hole cutter guide allows
    me to cut a hole that is almost exactly the right size, and it only takes
    a minute or 2 (photo #1). I cleaned that up with the carbide air grinder
    and drilled 4 mounting holes (#2).

    Next, I had to prep the mixer for welding. That included trimming back some
    of the steel to clear the motor bolts, as well as removing paint (#3). Those
    free-hand cuts are ooogly.

    Photo #4 is the result. Now I can mount the motor.
    Attached Thumbnails Attached Thumbnails converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_11.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_12.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_13.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_14.jpg  
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  7. #7
    Elite Member dfkrug's Avatar
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    Default Re: converting a 3-pt concrete mixer from PTO to hydraulic drive

    Now the motor is mounted, and the sprocket is welded up (#1 and #2).

    Everything is put back together with a slightly lengthened chain, and I
    am good to go (#3, and #4).

    I chose to use 15-ft long 1/4" hoses after determining that my fluid
    velocity would be about 13fps for 2GPM flow rate. This is a little high,
    and will cause some fluid heating, but it is acceptable. I do not run the
    mixer for extended periods, or I would have gone with 3/8" hose. I am
    fortunate that my Kioti tractor's OEM AUX valve is detented. Buying
    pre-made hoses of this length saves tons of money over having them
    custom made at a hydraulics shop.
    Attached Thumbnails Attached Thumbnails converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_15.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_16.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_17.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_18.jpg  
    See my TBN projects at:
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  8. #8
    Elite Member dfkrug's Avatar
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    Default Re: converting a 3-pt concrete mixer from PTO to hydraulic drive

    This is how I operate my mixer. I made a 3-pt hitch for my pallet fork
    frame. I could also use this on the rear 3-pt hitch. I have just poured
    some piers for a new carport structure I am making and it works well.

    I chose to make a hitch for my fork frame because that is the implement
    I most often use. I have tried my rock rake with it and it works great.
    One could also adapt one of those 3-pt quick hitch adapters to the FEL
    mounts.
    Attached Thumbnails Attached Thumbnails converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_19.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_20a.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_21.jpg   converting a 3-pt concrete mixer from PTO to hydraulic drive-mxr_22.jpg  
    See my TBN projects at:
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  9. #9
    bjr
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    Default Re: converting a 3-pt concrete mixer from PTO to hydraulic drive

    Looks good!! Well done. bjr

  10. #10
    J_J
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    Super Star Member J_J's Avatar
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    Default Re: converting a 3-pt concrete mixer from PTO to hydraulic drive

    Nice job. Was there some reason you took the hyd motor apart?
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

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