Scag Hydro Filter Changed Now No Power From Wheels

Discussion in 'Lawn Mowing' started by CNYFarmboy, Apr 27, 2005.

  1. CNYFarmboy

    CNYFarmboy LawnSite Member
    Posts: 9

    I just changed the filter and I dont seem to be able to get the air out, Is there any tricks to this. The mower is a 61" hydro WB. Thanks

    Joe
     
  2. TURF DOCTOR

    TURF DOCTOR LawnSite Silver Member
    Posts: 2,138

    The air should rise in a few we change them at night by the morning they are fine
     
  3. grassmanvt

    grassmanvt LawnSite Senior Member
    Posts: 906

    on the ztrs usually if you lift them off the ground and spin the work the contols it will work its way out. My buntons have a little bypass valve that you open up, work the levers, and this works well too. Not sure if the same applies on a walk behind but I imagine the hydro systems are similar.
     
  4. captken

    captken LawnSite Bronze Member
    Posts: 1,707

    I have heard of two ways.

    After changing the fluid and filter. Fill the new filter completly up with fresh oil before installing it!

    Then:

    1. lift unit rear wheels off the ground, operate machine in reverse for 20-30 mins. leaving bypass valves closed.

    2. lift unit rear wheels off the ground, operate machine alternating forward then reverse [holding in each direction for a while] with the bypass valve opened one turn.
    Repeat many many times. Close valves, lower then test machine.

    I used number 2 last time I changed the fluid. After working the machine over 3 weeks, I find I need to bleed them again [small air bubbles suspended in the oil] unresponsive right side at startup.

    I am going to try number 1 this time, as was suggested by a friend.

    He also suggested I check the drive belt for the pumps again. This was replaced when I changed the fluid. He said that the pump drive belt can cause problems if it has any defects at all.

    hope this helps

    good luck.
     

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