Currently have a 2012 Bobcat E26 where the hydraulics stopped operating. Some of the Trouble shooting that has already been done is as follows. Checked powers and grounds. Inspected wiring harness and no breaks in the wiring. Magnetic switch is operating correctly with supplied 8v and power returns to the control board. The control Board however will not energize the pilot solenoid. Currently have the service/shop manual for the machine however it does not go thru the steps that are required in the control board that will allow the function of the pilot solenoid. Unfortunately the machine does not have the control board screen to allow any code checks. Wondering if anyone else out there has ran into any of these issues and could point me in a good directions it would be greatly appreciated.
Have you tried energizing the pilot solenoid with remote power. Not sure what it gets in terms of voltage to that solenoid. How did you check the grounds out of curiosity. Not there so just asking in case I think of something missed. Maybe post a picture of the Pilot solenoid. Is the safety circuit working properly. Simon C
Yes, when energizing the pilot solenoid with remote power the unit comes up and works. However the auto throttle will not function and the unit will not throttle up for more than a few moments. For the Ground checking we preformed a voltage drop test which was around .2 volts on the ground side and power side. To me it seems like it could be another pressure switch or sensor that could possibly be bad which is keeping the control board from activating the pilots solenoid. I appreciate the input and with everything things can easily be missed or over looked without a few extra eyes sometimes. Pulled the Control board apart to check for anything obvious as far as a burnt driver but without a detailed schematic its sometimes hard to diagnose. From what I am noticing Bobcats service manuals seems to be a bit less than helpful on the electronic side so far.
Absolutely correct about less than adequate info from them. You seem to have checked the grounds and powers correctly. How did you test the safety circuit with the safety arm on left side of seat. Could that be your problem, since the pilot solenoid worked with direct power. Just trying to think of simple things. A schematic would be very helpful. Simon C
Forgot to mention, did you check all the fuses with a test light as your Fluke can show power when it will only display on a multimeter but not light a test light. Simon C
Even took a thermal camera over most of the wiring harness to look for signs of high resistance in the wiring. Relays have been swapped out with new ones incase of a bad contact. This one has me scratching my head, but wanted to rule out things missed or someone that would possibly have some good experience in the bobcat world to know if the control boards are normal to fail. The unit has about 4K hours on it currently. Simon, I appreciate your comments
Have the wires going in and out of the arm switch been tested with a bulb to see if the path is too weak. Simon C
I'll give this a try and see what happens. If you think of anything else in the mean time keep me posted.
Even with the plugs taken apart, an ohm meter test will only tell you you are on the correct path, won't tell you how good the wires are in terms of having the ability to carry current plus you can test the switch at the same time. Simon C
We done a voltage drop test on the mag switch on the arm and there wasn't any drop so that negates this one out as well.
While digging deeper the ground on the Mag switch was not making good enough connection when it was in the machine. After taking the switch out and wiggling the wires it became clear it was a simple problem. Simon C thank you for your inputs they are appreciated.
I was going to ask exactly how the magnetic switch was tested. I have tested for voltage drop before but did not realize that there was not a complete circuit, thus no voltage drop on the part I was testing. Voltage drop testing always requires a flow of current to be accurate. The higher the current in comparison to what the running current is the closer the test will be in accuracy. So it is moving now and the hydraulics are okay? Glad to help. Simon C
Yes, its back up and operating just fine.
Glad the simple tests revealed the real cause. Its called diagnostic based repairs, better than firing a cannon of parts. Simon C
Did you solve the issues?
Check post number 11 for what was the solution, The magnetic safety switch. Simon C
Ok,
Actually the issue was not the magnetic switch but the switch connector going into the wiring harness.
For which machine
For the Bobcat E26
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