Gravely 152Z clutch problem

Discussion in 'Mechanic and Repair' started by aroddy, Feb 14, 2013.

  1. aroddy

    aroddy LawnSite Senior Member
    Posts: 301

    I had a gravely 152Z roll into the shop today with a kohler command CV730. when you engaged the PTO clutch, the clutch would cut in and out at all RPMs like it had a loose connection. We replaced the diode in the clutch harness since it tested bad. Now the the clutch won't cut in and out untill 3300 RPM. What gives?!?! any insight would be greatly appreciated
     
  2. aroddy

    aroddy LawnSite Senior Member
    Posts: 301

    BTW all grounds and connections in the harness were cleaned and put back together after we checked all the prongs and made sure they weren't backed out in the plugs bases...
     
  3. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    I'm guessing something made the clutch diode fail...
    Check the voltage at the clutch when it is kicking in and out...
    If the voltage remains steady...the clutch has an internal problem..
    If the voltage cycles with the clutch..it may be a bad Pto switch...
    Just a guess...
     
  4. aroddy

    aroddy LawnSite Senior Member
    Posts: 301

    We checked the PTO switch for continuity and it was good. I know that the diode in the harness is to eliminate voltage spike going back into the machine harness so it doesn't make other stuff fail. Its wild Tho.... still scratching the brain on this one.
    Posted via Mobile Device
     
  5. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    You have to check the system for voltage while it is running to find an intermittent problem..
    Continuity will not tell you if the wiring....switch....or clutch...are failing under load...

    The diode is to prevent the clutch from spiking the electrical system when it is turned off..
     
  6. Landrus2

    Landrus2 LawnSite Platinum Member
    Posts: 4,812

    When the clutch is in fail mode shut engine off and disconnect the clutch wires. Check for 12v across those 2 wires going to the clutch wires before the clutch connector
    Another thing you can try is to not start the engine but have your key in the on position Engage your clutch switch You should hear a click If you do or if you don't move all the wires associated with the clutch. If there is a wire connection problem you will hear your clutch click on and off Then you can locate where exactly in the wiring the problem is:waving:
     
  7. piston slapper

    piston slapper LawnSite Platinum Member
    Posts: 4,240

    Hmmmm....thought this stuff was already posted....Hmmmm....

    I guess you could try Mechanic in a Bottle...
     
  8. Landrus2

    Landrus2 LawnSite Platinum Member
    Posts: 4,812

  9. aroddy

    aroddy LawnSite Senior Member
    Posts: 301

    thanks for the replies- the mechanic in a bottle fixed it ha ha jk. There is two relays on the machine...we disconnected the relay that controlled the main harness and everything worked fine...so naturally we checked all the wiring for bare spots and such and found a bunch of butchered up wiring from the previous owner (Says the current owner) in the harness loom. Cleaned up and tied it all back together correctly and sent it back into the world
     

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