John Deere 160 Lawn Tractor

Discussion in 'Mechanic and Repair' started by jon132783, Jul 27, 2011.

  1. jon132783

    jon132783 LawnSite Member
    Posts: 3

    I have a 1990 or 1991 John Deere 160 Lawn Tractor with a 38 in mowing deck. When I go to mow the blades will suddenly disengage. The mower will continue to run, the blades will not cut. I have put on a new pto clutch, pto switch, and safety switch and none of these have worked. I have checked the spindles to see if they heat up, but they do not. Any ideas on what is wrong? Could it be the battery is not giving enough juice because of the new pto clutch?
     
  2. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,024


    Could be the battery not holding enough voltage/amperage to keep the clutch engaged, Or the charging system isn't putting enough voltage/amperage back into the battery.

    Have the battery checked/load tested, Then test voltage across the battery post with the engine running at full throttle clutch off. With a good battery you should see 13.8 to 14.5 volts.....
     
  3. TLS

    TLS LawnSite Fanatic
    Posts: 7,940

    Sounds like a seat safety switch to me?
     
  4. jon132783

    jon132783 LawnSite Member
    Posts: 3

    I put a new seat safety switch on, it did not make a difference
     
  5. TLS

    TLS LawnSite Fanatic
    Posts: 7,940

    But is that what it's emulating? The tractor is shutting the deck off as if you lifted your butt off the seat?

    Or is it mowing fine for hours and randomly disengaging the clutch at random times?

    The voltage (amperage) is definitely something to check, but we need more info to properly diagnose via the fancy thinkin box!
     
  6. jon132783

    jon132783 LawnSite Member
    Posts: 3

    It is similar to when you lift your butt up...but the blades disengage at weird intervals. Sometimes it mows for 5 mins other times it will mow for 45 mins. I was very conscious of the fact it could be the safety switch so I was seated firmly.
     
  7. TLS

    TLS LawnSite Fanatic
    Posts: 7,940

    I would check wire connection to clutch then if the battery load tests fine. Matter of fact I would un-plug and re-plug in every wire connection just to make sure.
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