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Hypro D403 Oil reservoir

Discussion in 'Pesticide & Herbicide Application' started by sciturfman, Feb 4, 2009.

  1. sciturfman

    sciturfman LawnSite Member
    from Zone 9
    Messages: 13

    We had the oil disappear in the reservoir yesterday even though we never lost pressure. Is this a bad diaphragm(s) or is it bigger trouble? The bowl is dry of oil, not milky like when a diaphragm goes bad. Anybody have this happen before on a Lesco Spacesaver? Thanks.
  2. treegal1

    treegal1 LawnSite Gold Member
    Messages: 3,911

    yep its the rubber gone bad! look in the tank for oil!!!

    some one from here save my second set of knuckles and told me to take 3 of the 4 motor bolts out and swing the motor away from the reel, thanks again you know who:waving:

    rittenhouse has them real cheap. and can get them to you fast!!!

  3. RigglePLC

    RigglePLC LawnSite Fanatic
    Messages: 13,724

    Thanks, Treegal. You are so right. However, there is a chance you will get lucky, Sciturf.
    Often there will be an air bubble in the oil reservoir, especially after the oil is first changed. When the air gradually finds its way out--the oil level goes down. Try adding more oil. Run the pump. Repeat as needed. It may take several times until all the air is out. If the oil does not turn milky due to water in the oil--you are OK. I am sure you installed new oil and diaphragms during the winter layover in Zone 9 right? LOL!
  4. treegal1

    treegal1 LawnSite Gold Member
    Messages: 3,911

    take a flex soda straw and poke it into the reservoir and add the oil slowly and the air will come out of the straw!!! also heat the oil up some. like 100 deg. and it will go faster.....
  5. Ric

    Ric LawnSite Fanatic
    Messages: 11,969


    I never had a model D 403 Hypro but I have had the oil seal between the gear reducer and the pump go bad on a D 30 causing the same problem. However topping off the oil can only hide the problem of gear oil and 30 weight mixing. I find it is not the cost of the parts but the PITA of tearing the pump down completely to replace that seal. In my case it was storing the D 30 pump for 5 years and then putting it back in service.
  6. grassman177

    grassman177 LawnSite Fanatic
    Messages: 9,795

    sounds like the seal/diapphram to me. had this happen before . we replace them every spring as habbit and usually dont have problems other than that.
  7. sciturfman

    sciturfman LawnSite Member
    from Zone 9
    Messages: 13

    Well, it wasn't the diaphragms! The connecting rod on the piston was broken! I never thought about " slingin a rod " in a Lesco sprayer!! Oh well, just another day in the life of a spray dude.
  8. treegal1

    treegal1 LawnSite Gold Member
    Messages: 3,911

    OMG, THAT SUCKS!!!!!! my most sincere condolences. another day right..............
  9. whoopassonthebluegrass

    whoopassonthebluegrass LawnSite Platinum Member
    Messages: 4,305

    I've had it happen multiple times. ALWAYS been a bad diaphragm for me.

    The D403 is a total piece of $hit. Possibly my most lamentable equipment purchase...
  10. Ric

    Ric LawnSite Fanatic
    Messages: 11,969

    Years ago I had to replace connecting rods on a D 19 Hypro and it is still running today. I forget why they went bad, but the D 19 was suppose to be a bad model any way. I have two D 19 skid sprayers and the newer one puts out big time while the older one I replaced rods on has never been all that great. I am not sure I have one great one and one normal one, or one normal and one lousy one. Given the age and wear I think I might have a very tired one.

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