Hi Guys, I'm a newbie here from the other side of the World but I'm having an issue that needs some outside expertise. I have a 277C with only 200 hours on it, but it is three or four years old. Last week it started showing a yellow exclamation warning on the left side top panel. I don't have the top right panel so no way to read codes. If the yellow light was on it would steer slightly to the left in the straight ahead position and you have to keep pushing it back. Really annoying.
In desperation I purchased a CAT ET system and it has a code E568 and says left drive motor speed sensor #1: Erratic, Intermittent or Incorrect Then another one that says Left Drive Speed Sensor #1: Abnormal Frequency, Pulse Width or Period?
Any clues as to what this could be?
I've followed the wiring where it exits the lower side of the cabin and attaches to the hydraulic lines. There is a plug there and I removed and cleaned that but it was clean as can be inside. Very well sealed. There isn't any physical damage to the wiring that I can see. You can trace with your fingers and a mirror and see that the wires go into the back of a silver steel housing which is probably the speed sensor itself.
Could loose tracks make one side go faster than the other and upset the ECM? I've only recently purchased the machine and done less than 20 hrs on it but I don't think it's even had it's first service let alone had the tracks adjusted ever.
At first the light and beeper came up and stayed on until forward motion stopped and hand was off joystick. Then after a while it actually stopped the machine, no forward or backward motion just the bucket still operating fine. Turn off the machine and do a full restart and it came back again.
Back to the shed with it, checked filters, air intakes, levels etc, topped up the hydraulics which were 8 liters down and cleaned the pre air filter which was nearly clogged with fine dust and I was sure that this would fix it but the next time it went out it repeated the same fault.
Here's a picture of the screen dump created by the CAT ET.
In desperation I purchased a CAT ET system and it has a code E568 and says left drive motor speed sensor #1: Erratic, Intermittent or Incorrect Then another one that says Left Drive Speed Sensor #1: Abnormal Frequency, Pulse Width or Period?
Any clues as to what this could be?
I've followed the wiring where it exits the lower side of the cabin and attaches to the hydraulic lines. There is a plug there and I removed and cleaned that but it was clean as can be inside. Very well sealed. There isn't any physical damage to the wiring that I can see. You can trace with your fingers and a mirror and see that the wires go into the back of a silver steel housing which is probably the speed sensor itself.
Could loose tracks make one side go faster than the other and upset the ECM? I've only recently purchased the machine and done less than 20 hrs on it but I don't think it's even had it's first service let alone had the tracks adjusted ever.
At first the light and beeper came up and stayed on until forward motion stopped and hand was off joystick. Then after a while it actually stopped the machine, no forward or backward motion just the bucket still operating fine. Turn off the machine and do a full restart and it came back again.
Back to the shed with it, checked filters, air intakes, levels etc, topped up the hydraulics which were 8 liters down and cleaned the pre air filter which was nearly clogged with fine dust and I was sure that this would fix it but the next time it went out it repeated the same fault.
Here's a picture of the screen dump created by the CAT ET.
Cat 277C yellow exclamation warning and beeper.
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