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Walker suction problem

Discussion in 'Lawn Mowing' started by bligh61, Nov 8, 2007.

  1. bligh61

    bligh61 LawnSite Member
    Messages: 240

    My 1999 20hp ghs 42" deck walker has not been vacuming leaves like it
    has in the past. It is leaving small amounts of leaves behinb. I have
    replaced the belts and blower housing, and catcher screen and there
    are no clogs. The motor has 1690hrs but seems fine. The deck is
    slightly worn and some of the baffles on it are bent a little. Even
    dropping the deck very low doesnt solve the problem. Also the blades
    are new. Any help would be appreciated.
  2. edward hedrick

    edward hedrick LawnSite Senior Member
    Messages: 871

    Check the screen in the box. I changed mine to the 3/4". no clogs.

    Check the belt that drives blower. Check the transfer chute. I had a stick jam

    had to get down and check chute. Ed
  3. Oldtimer

    Oldtimer LawnSite Bronze Member
    Messages: 1,459

    Check the engine rpms.

    I really don't know how any LCO can get along without a tach to check all his engines. I was a LCO from 1983-1996 and have owned an outdoor power equipment dealership since 1985. During that time I have seen hundreds of cutting issues resolved by just adjusting the engine rpms. It is hard for any operator or technician to really notice a few hundred rpms difference. An engine will slow down just enough to cause minor cutting problems and the operator won't notice any difference in the sound.

    We have a couple of very good tachs in the shop but the most economical tach is a SenDec. We coiled the pick up wire into a tight loop and attached it to the back of the unit with zip ties. This unit has been in service for several years and is very easy to use on any small engine except for the new Stihl saws (MS280) with an electronic carb control.

  4. bligh61

    bligh61 LawnSite Member
    Messages: 240

    how do you hook up the tach? where can i purchase one?
  5. TLS

    TLS LawnSite Fanatic
    Messages: 7,943

    Tiny-Tach's are IMO better than the tiny readouts on the SenDec's.

    You do have to ground the Tiny-Tach's though.

    Every mower should have one. Not just one in the toolbox. But if your going to get one just for a toolbox, yes the SenDec's don't require a ground and are a bit cheaper.

    I would also say that if your deck is worn and bent baffles, that likely your not as perfect with blade condition (not sharpness, but how many times they've been sharpened and what is left of them) and this will cause loss of lift.

    Get NEW blades and get those RPM's up.
  6. bligh61

    bligh61 LawnSite Member
    Messages: 240

    How do I raise the rpms
  7. TLS

    TLS LawnSite Fanatic
    Messages: 7,943

    There are quite a few threads related to this. I'm not familiar with the 20hp horizontal that Walker uses.

    Your dealer can do this for a nominal fee I'm sure.
  8. bligh61

    bligh61 LawnSite Member
    Messages: 240

    The problem was low rpms . thanks for all the great advice.:walking: :cool2: :walking:

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