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2008 CAT 262C Alarms in Reverse/parking brake on

Discussion in 'Skid Steers' started by Kevin Finley, Jul 11, 2022.

  1. Kevin Finley

    Kevin Finley Member

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    Location:
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    Hello and thanks for having me.
    This machine is new to me. After heavy rains last Tuesday the machine started alarming out in reverse. By this I mean that when the joystick was pulled back, the parking brake would engage, the yellow Hazard light would flash, and the engine light would flash yellow. The only way to operate again was to shut off and restart the machine.

    note- I could turn left and right, telling me that at least mechanically, both drives work in reverse.

    Suspecting a speed sensor wire or something had rubbed through, I inspected all visible wiring and connections under the cab today and cleaned out quite a few. For the most part everything appears to be in good clean shape. I left for a few hours and came back to try again.

    Now, the parking brake will not disengage. The switch will disengage hydraulic lockout but not the brake. Interestingly, even with the machine not running (key on) but still in park, if I pull the left joystick back, the instrument panel still lights up as before. However, now I have zero travel functionality and just an expensive paperweight.

    Before I start throwing parts at it I ordered a scan tool that will hopefully be here this week and will hopefully pull CAT codes. Hoping someone more familiar with this electrical system can point me in the right direction!

    Thanks for any and all help!
     
  2. Nige

    Nige Senior Member

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    Until you have access to obtain Diagnostic Codes it’s difficult to even speculate. When you get the Codes post a Serial Number as well, it makes finding information easier.
     
    mg2361 likes this.
  3. Kevin Finley

    Kevin Finley Member

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    Hopefully the tool works as stated. Will be delivered tomorrow.

    Serial: MST01245
     
  4. Nige

    Nige Senior Member

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    Good-oh. Let us know as soon as you get some Codes.
    You will probably also need an electrical schematic to help while you are doing diagnostic procedures.
    I'll pull a copy of the correct one for your Serial Number and send it to you. Keep an eye on your messages.
     
    512high likes this.
  5. Kevin Finley

    Kevin Finley Member

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    I’ve attached an image with the codes that I pulled. Hard to even google what these numbers even mean
     

    Attached Files:

  6. Nige

    Nige Senior Member

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    Does whoever you bought the scanner from supply a user manual for it.?
    I have absolutely no idea what the information on that screen means. Maybe someone else who might have used this type of scanner before can help.?
    The image says "Active DTC", is their a way of looking at Logged DTC.?
     
  7. Chrisso

    Chrisso Well-Known Member

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    Occupation:
    Diesel Mechanic
    Location:
    Australia
    Got nothing here either on any of those numbers..

    We want to see something along the lines of 2474-08 or 2474-04 or similar... 2474 being the component (LH joystick forw/rev axis) and 04 or 08 being the failure mode (ie voltage below normal or abnormal data, etc)
     
  8. Kevin Finley

    Kevin Finley Member

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    The manual with the reader is pretty useless, here are a few other functions I toyed with that offered data. One is the logged DTCs
     
  9. Kevin Finley

    Kevin Finley Member

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    Sorry posted before upload was complete
     

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  10. Chrisso

    Chrisso Well-Known Member

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    Left joystick left/right position sensor, voltage above normal equates to a 2476-03 code. It seems to be active from the pictures you posted... that'll most likely be what's causing your fault.

    There's a troubleshooting procedure out there for that code but I'd start by having a good look over your wiring to the LH joystick.
     
  11. Nige

    Nige Senior Member

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    Here it is..........
    If you need an electrical schematic to help you with your troubleshooting then please ask.
     

    Attached Files:

  12. Nige

    Nige Senior Member

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    After a bit more digging I'm thinking that you might be better re-selling that scan tool and buy a RH instrument panel for your machine. If you buy a 364-6336 (illustrated below) plus a few other bits listed in the attachment it is plug & play and will read Events, Diagnostic Codes, and sensor outputs amongst other things.

    upload_2022-7-16_13-31-8.png
     

    Attached Files:

    Chrisso likes this.
  13. Mobiltech

    Mobiltech Senior Member

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    Sounds like a bad joystick sensor. I think you have to replace complete joystick.
     
  14. Kevin Finley

    Kevin Finley Member

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    I pulled off the joystick assembly and the connectors and wires were ziptied extremely tight. both bundles of wires had worn through the outer sheath and a few wires were nicked.

    The joystick under the boot is also just filthy. I'm going to tear the entire thing down and rebuild it/clean it before going through the full diagnostics.

    Thanks everyone
     
  15. Cat299C

    Cat299C Member

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    FYI - I'm dealing with similar issues on a 299C at the moment. Took the base out, cleaned it up (wasn't that bad as I have a cab machine) and it did not fix the issue. Hope you have better luck!
    I have ordered a new left joystick base and will see if that fixes my issue. I highly recommend the right side display mentioned above as it will provide diagnostic codes as well as multiple other features for both operating and servicing the machine. The more I researched my issue, the more I concluded these joystick bases seem prone to failure.
     
  16. Kevin Finley

    Kevin Finley Member

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    Well I’d guess I found my problem. Broken Zip tie in the joystick. It marred up the yellow sensor pad itself hopefully not too bad but it may be shot
     

    Attached Files:

  17. Kevin Finley

    Kevin Finley Member

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    Still broken. Diagnostics checked out. Joystick ordered.
    @Cat299C After exhaustively searching and calling reman and parts houses as well as scrap yards nationwide, the fact that these are nearly impossible to find lends itself to your theory that they are a common issue. You'd think otherwise, somewhere, somehow there would be wrecked skids out there with solid joysticks
     
  18. Cat299C

    Cat299C Member

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    Kevin - FYI, I installed a new joystick base today and the machine is now working. Hope it solves your issue as well.
     
  19. Kevin Finley

    Kevin Finley Member

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    Did you have it recalibrated?
     
  20. Nige

    Nige Senior Member

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    It's not the joystick that requires recalibration if the base is replaced, it's the proportional solenoid valves that the signals from the joystick sensors control. See attachment.

    In the strictest sense of the word all the relevant functions controlled by a particular joystick (LH or RH) should be recalibrated after replacing a joystick base. The sensors in the base give a signal on both X and Y-Axis from 0% in neutral to 100% in one direction and to -100% in the other. That signal should not change if the base is replaced by another. In a dealer shop it would be SOP to do the calibration because all the electronic diagnostic tools (ET & Comm Adapter) would be on hand and it would take maybe 5 minutes to do. Doing the job on site without access to the diagnostic tooling I would think 99% of the time after testing the machine response to the newly-installed joystick base a re-cal would not be necessary.

    Now if it was a proportional solenoid valve that had been replaced it would be a different story altogether.
     

    Attached Files:

    BigWrench55 likes this.