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Thread: rebuilding a delaval 76 vac pump

  1. #1
    Join Date
    Feb 2009
    Location
    northern,ny
    Posts
    400

    Default rebuilding a delaval 76 vac pump

    has anybody ever rebuilt a delaval 76 vacuume pump?? i have one i bought at a farm auction.i,ve seen alot of pumps at auctions really cheap and i,am thinking about picking them up if the price is right and the case seems to be ok..no cracks,ect..ofcourse i won,t know what they look like on the inside until i pull them apart.
    i see parts online sells rebuilt pumps and they talk about what they do to them..ofcourse new bearings,a seal and vanes and they machine the inside.

    delbert

  2. #2
    Join Date
    Apr 2008
    Location
    Jacksonport Wisc
    Posts
    4,377

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    TwoBears I have taken them apart. But they looked good so back they went. I find that if you spin them by hand they will make noticeable vacuum. If the vanes are fine and it had oil in it I would think its good. I was at a dairy supply and repair place and they had a pallet full of vacuum pumps of all types and they said that they all go in and get rebuilt come back as new specs. New bearings, gaskets, vanes, seals, machining and paint.
    1100 on vacuum 3X10 Waterloo Small oil fired with pre heater. 24X36" gas fired finishing pans
    10X16 Evaporator room 16X24 kitchen+bottling room.
    vacuum pump called the BEAST new Gast vac pump
    2 Bernard double extractors
    7" filter press Allis Chalmers B
    Alot of family and friends to help
    Old yellow lab called Maple
    photobucket http://s853.photobucket.com/albums/ab91/cethaynes1noz/

  3. #3
    Join Date
    Sep 2003
    Location
    Whately, Ma.
    Posts
    2,847

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    I have taken apart vane style vac. pumps many times and have cleaned the vanes. many times they can get gummed up and stick. So when it is turned on either you get no vac. or it sounds like a engine running with one less cylinder. I have also taken the bearings and seals to a local automotive store and gotten them replaced.
    Good luck
    Keith

  4. #4
    Join Date
    Jan 2009
    Location
    Altmar, NY
    Posts
    3,495

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    Never done a delaval pump but I do gast vane pumps monthly. A couple things I can recomend. Do it right once and i will last you many years. Get a cylinder honing tool from an auto store that goes on your drill. Hone out the cylindre wall lightly to get the glazing of the walls. If you see any mild scoring on the cylinder hone it till its gone. This will help make for better vac transfer and aid in the longevity of your vanes. Flush the cylinder out well to get her clean and all particles out of the system. I would also replace your bearings regardless if they feel good or not. You have it apart now why go back after one season and do it then when they fail. Inspect the vanes and if there is mild scoring on them a fine peice of sand paper on a flat surface and lightly smooth them out. If they are pretty worn down or have excessive grooving from the contact of the slot they fit in replace them. They are not cheap. Slap it all together and let her run for an hour under no load to let the vanes settle back in nicely. Give her a nice shiny new paint job and enjoy your pump.
    2X6 deluxe Phanuef
    Adding 200 more every year
    27 years left of building a Hobby into a retirement time burner.

  5. #5
    Join Date
    Dec 2010
    Location
    Ellenburg Depot NY
    Posts
    10

    Default rebuilding deleval 76

    I rebuilt a deleval 78 last season... Not so good of results but maybe someone can shed some light on this.. I replaced all the vanes, seals and bearings, used some very fine emery to get the gummed up stuff out. Checked all oil lines and they all worked fine. Pulled 28 inches of vac the first six hours and then went down from there. I was so upset I quit sugaring about three days early. The repair parts were about $250.00 and I was on a budget for the season. I have since bought another repair kit and plan on rebuilding this beast again but need some advice. Where did I go wrong.. HELP PLEASE ... Thanks Bill

  6. #6
    Join Date
    Jan 2006
    Location
    A, A shrewsbury vt
    Posts
    994

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    were you reclaiming the oil? those pumps are not made to pull 28 inches of vac!! you will do 22 inches on a cool day but as the season goes on and it gets warmer the pump is hard to cool. more like 18 to 20 inches. an oil reclaimer is a must! a auto transmission cooler between the reclaimer and the pump will help cool the oil. a 5/16 line of water running onto pump head will cool it. but heat is your killer. running diesel fuel thru it will clean the gum off the vanes.
    10,000 taps and adding on vac.4 liquid ring pumps, lapierre 5x14 thunderbolt, 1800 R/O

    http://s213.photobucket.com/albums/cc279/mapletime/

  7. #7
    Join Date
    Apr 2008
    Location
    Jacksonport Wisc
    Posts
    4,377

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    I run my Masport all day long with oil flood and I dont use a vacuum regulator for cool air into the pump. Have you ever seen a VW engine blown and injected so Yea you can get a dairy pump up to 26 all day long even with end of season temps.
    1100 on vacuum 3X10 Waterloo Small oil fired with pre heater. 24X36" gas fired finishing pans
    10X16 Evaporator room 16X24 kitchen+bottling room.
    vacuum pump called the BEAST new Gast vac pump
    2 Bernard double extractors
    7" filter press Allis Chalmers B
    Alot of family and friends to help
    Old yellow lab called Maple
    photobucket http://s853.photobucket.com/albums/ab91/cethaynes1noz/

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