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  1. #1
    NHscrapman started this thread.
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    How to breakdown 3/4 hp airless sprayer

    Here is a paint gun ready for scrapping.Wagner 3/4 hp piston motor with all the accessories.


    Step 1 remove hoses and handle. I would be done scrapping here usually, 20 lb motor and a lb of light steel and 2 minutes of work.
    [/URL][/IMG]

    WARNING
    Continuing the breakdown you will need to drain the oil. I like to remove all but one screw from the head, the last screw gets backed out half way then place the unit over your drain bucket/pan and tap the cover to break the seal. Leaving the last screw in keeps you from digging the cover out of the oil bucket.


    While your waiting for it to drain pull off the pump head and gasket underneath.
    [IMG][/IMG]

    Cleaning the pumphead I just pull the brass straight out


    Now its time to get into this baby. fan cover and fan come off. cover was 2 screws and I hammer the fan off instead of prying. Watch those flying bits.
    This exposes the four long bolts that hold the cap to the unit.



    Now tap off the cover to expose the motor and wiring remove wiring and associated pieces as they tend to get in the way sliding the core out.


    clean the cover plate
    There ain't nothing wrong with an honest days work. Anyone who says otherwise is a fool.- Old Man

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  3. #2
    NHscrapman started this thread.
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    Please add thanks to first post
    The bits of copper and brass from the switches and a couple of contacts.
    [IMG][/IMG]
    Now pull the rotor out, some tapping with a hammer to get it started. Clean the stator however you do it
    [IMG][/IMG]

    to separate the rotor from the Al Remove the C clip
    [IMG][/IMG]

    Pry off the bearing and the spring assembly will fall out. There will be a bearing in the cast a few hits of a hammer takes it right out. The last piece on the cast Al was a GPM control which had a hex screw holding on the knob and then simply unscrew the brass adjuster the smaller brass pin is underneath.


    cut or unhook the springs on the rotor to get the two last pieces of cast AL. A hammer works well if they resist.


    leaving you with


    [IMG][/IMG]
    Edit: Not in pic Power cord, brass prongs pulled weights the same

    Totals were
    1/4 lb AL winding
    5 oz copper
    9.1 oz of yellow brass (with wire ends)
    2 lbs light steel
    11 lbs prepared
    2.4 oz insulated wire
    4.5 lbs cast Al

    Selling as a motor I would have made $2.15 in a couple minutes of work current prices
    It took 30 min to tear down the motor and another 10 to get the windings out (which were half Al). After breakdown I would make $5.55 current prices.
    The gun hoses and fittings are all in good shape and will be resold.

    Tools
    Drill, (standard, phillips, 3/8 bit )Pliers, hex wrench, prybar, cutters, oil bucket, hammer, chisel.

    Any questions feel free to ask.
    Last edited by NHscrapman; 01-08-2015 at 11:25 AM.

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  5. #3
    Abuilder's Avatar
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    Only 5 OZ of copper? OUCH
    Did you strip all of the wire out of the field windings?

  6. #4
    NHscrapman started this thread.
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    Great question
    No, the wires went into insulated wire category.

  7. #5
    NHscrapman started this thread.
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    Update
    sold the hoses, gun, and bearings for a total of $75.
    better than a whole truckload of light steel


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