What's that screeching noise?

Discussion in 'Mechanic and Repair' started by bugspit, Jul 10, 2006.

  1. bugspit

    bugspit LawnSite Senior Member
    Messages: 767

    Sometimes while cutting on a unlevel surfaces and turning, I'll hear a screeching noise that I think is coming from the Hydraulic units. It sounds as if they are low on oil but they are not, actually I overfilled the tank to see If it makes a difference, just to have it come out the vent.

    I guess it could be the trans belt or clutch, not sure, anyone else experience this?

    I'll assume it's not good to cause it but, what can I do except get straight and level asap. :confused:

    Less than 400hrs on a Scag Tiger Cub 48".
  2. grass_cuttin_fool

    grass_cuttin_fool LawnSite Gold Member
    Messages: 3,526

    at about that amount of hours my hydro belt was really bad, it had chunks missing from it and at times under a hard pull it would slip and my hydros made some weird noises and had a bad vibration at times, I replaced the belt and no other problems

  3. fixer67

    fixer67 LawnSite Silver Member
    Messages: 2,098

    If you put a Hydro unit under a heavy load and the by-pass valves are not fully closed the pump will make funny noises. Make sure your by-pass vlaves are fully closed
  4. MowerMedic77

    MowerMedic77 LawnSite Bronze Member
    Messages: 1,164

    I agree with GCF on the belt also check the tensioner idler with the tension off make sure its spins free and smooth.:)
  5. bugspit

    bugspit LawnSite Senior Member
    Messages: 767

    Thanks, :waving:

    Time for a lube job tomorrow so I'll check those items out.
  6. dcondon

    dcondon LawnSite Silver Member
    Messages: 2,246

    don't overfill it because that can cause more damage they not having enough in there!!!!!:hammerhead:
  7. bugspit

    bugspit LawnSite Senior Member
    Messages: 767

    The manual says fill to 3.25" below the filler (it normally stays at 4") , I had it at 3" and it spews out the vent hole, at least on hilly properties.

    But, even at 4" on a slope there's is plenty in the tank so it not likely to run low to cause the noise. That's what I was thinking, the pump ran short on oil on the slope and meeting the demand of turning, but I don't see how that could be. The above suggestions sound more logical.

    Plus the oil change for the Hydro is like 500hrs, should be able to handle anything during that time I would think.

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