Scag SWZ hydro Fluid

Discussion in 'Lawn Mowing' started by onelegjohn, Jun 19, 2002.

  1. onelegjohn

    onelegjohn LawnSite Member
    Messages: 77

    I just bought a used scag 52" SWZ - I need to know what kind of Hydro fluid to put in the reserve. I went to Tractor Supply and bought universal hydraulic fluid (tractor transmission) 10W-20. They had Hydraulic Oil, but I didn't know what to get. I don't want to damage my pumps by getting too thin or too thick viscosity oil. The "Oil" was 20 weight. I am a chemist and this is a mystery to me....Can some one point me in the right direction.

  2. LawnSmith

    LawnSmith LawnSite Senior Member
    Messages: 389

    the SWZ is a walk behind right? if so, my 1998 scag hydro walk behind uses 10w30 motor oil. but my TT's use the 20-50.
  3. onelegjohn

    onelegjohn LawnSite Member
    Messages: 77

    Can you check your manual to see the specs on the hydro trans I don't have a manual. I have ordered one but I need to know before I add the oil. Thanks for the response.

  4. onelegjohn

    onelegjohn LawnSite Member
    Messages: 77

    I am assuming the early 90's WB's used 10w-30 in their hydro trannies then. I am pretty sure I will be safe with the 10w-30 -

    - Does anyone know if hydraulic oil is ok to use? -
  5. SJR Lawncare

    SJR Lawncare LawnSite Senior Member
    Messages: 250

    I have a 2001 Scag swz52 & the manual calls for 4 qts. of
    SAE 20W50.

    Good luck, Steve
  6. Mark

    Mark LawnSite Senior Member
    Messages: 723

    I have a 2002 SWZU 52' hydro, Steve is correct SAE 20-50 for your Hydro mine also takes 4qts,,,,, Marks Mowing Service
  7. gaunlet13

    gaunlet13 LawnSite Member
    Messages: 10

    Mobil 1 15w50 is what I put in my 2000 mdl STT.
    Talked w/Scag about it and they said it is an over kill but ok.
    I figured less friction gives less heat (good thing). I'm hoping that it will help the pumps last longer.
  8. lawnkid

    lawnkid LawnSite Senior Member
    Messages: 935

    I use fully synthetic Mobil 1 20W50 for my 1996 52" SWZ and it works great but it is kinda expensive cause it's a racing oil. Oh well,
  9. Jimbo

    Jimbo LawnSite Bronze Member
    Messages: 1,093

    My Scag 52" Tiger Cub calls for 20W-50 for the Hydro oil, and straight 30W or 40W for the Engine oil depending on Temperature. I use 40W since I dont mow below 40F.

    This info is straight form the manual!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

    Good Luck

    P.S. Buy the manual it's cheap.
  10. onelegjohn

    onelegjohn LawnSite Member
    Messages: 77

    FYI - The oil has two numbers the first being the viscosity or thickness when warm - the second is the thickness when cold. So - really you could be making your pumps work harder using 20 weight intead of 10weight. The 20 is thicker and harder to push.


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