JM 284 Tach works, hour meter does not work

Forum Forums Tractor Troubleshooting JM 284 Tach works, hour meter does not work

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    • #30547
      gerry101
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        My 284 now has 299.9 hours showing on the hour meter. It has shown the same reading for at least 6 hrs.

        Can anyone direct me on troubleshooting this problem? Any help would be greatly appreciated.

        This is a 2005 JM 284 with a cluster type instrument panel.

      • #34470
        Affordable
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          If the Tach works, it's something on the circuit board causing the problem and sad to say you wll have to replace the panel, or get you a aftermarket Hour gauge and drill a hole in the dash to install it

           

          Tommy

          Affordable Tractor Sales

          “Your Jinma Parts Superstore”

          http://www.affordabletractorsalesco.com

        • #34473
          gerry101
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            Thanks Tommy

          • #34485
            gerry101
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              Follow up…………

              As I was removing the cluster from the tractor. I heard a rattling on the inside of the cluster. I opened the cluster, removed the tach/hour meter and found the capacitor had broken off and rattling around inside the cluster housing. The wires were too short to re-solder. I have a neighbor who is a retired instrumentation engineer that just happened to have a capacitor with the same markings. We soldered the replacement capacitor in place, reassembled the cluster and waa-laa we now have hour meter readings again. I don't know if anyone else has had this same problem, but if you have, you might try this repair.

              I have been told that one can purchase this capacitor at your local radio shack. Sure hope this helps someone else.
            • #34486
              Affordable
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                Well good for you, glad you got it going, I have heard of that happing but it is something to watch out for

                 

                Tommy

                Affordable Tractor Sales Co.

                “Your Jinma Parts Superstore”

                http://www.affordabletractorsalesco.com

              • #34487
                Little_Grizzly
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                  I might suggest you glue that sucker down to something to prevent re-occurrence.  Hot-melt glue, RTV, caulk, whatever you have handy.  Except for some types of JB weld!  Some have metal powder mixed in and are electrically conductive. 

                • #34494
                  biggerten
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                    I agree that mechanical fastening of some sort is in order. In my 27 years (has it been that long?) in engineering, I have seen many broken solder joints – solder joints are electrical connections, not mechanical, for the reason seen here.

                     

                    As for RTV, many kinds are not suitable for electronic components, the outgassing can corrode things. Some are electronics safe, but it's not really advertised which are and which aren't. I'd go with hot glue.

                  • #34502
                    Bob Rooks
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                      You can use a dielectric epoxy to “pot” the circutry.

                      Potted circutry has been around for a long time and is very effective in harsh environments.

                      Account deleted.

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