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    Bobcat 863 - Electrical issues preventing aux usage

    Myself and another EE friend took a weekend to play with this. Most shops wouldn't have the tools necessary to do this kind of work, unfortunately. What we found... - With the solenoids disconnected, we could put an oscilloscope on the output from the PWM controller and see that it's sending...
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    Bobcat 863 - Electrical issues preventing aux usage

    I'm looking at the PWM module section now. I suppose I can use a normal multimeter and the PWM output into the solenoids should get averaged out, so I should see the output changing with the position of the thumb switch. I found the PWM controller today, it's tucked under the left fender in a...
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    Bobcat 863 - Electrical issues preventing aux usage

    Awesome, thanks. I'm understanding a bit more now. Last few days have been a huge learning opportunity. Turns out the "valve" assembly that the solenoid operates is more complex than I thought. I was kind of hoping the entire core of the solenoid moved, and I could just attach a cable to the...
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    Bobcat 863 - Electrical issues preventing aux usage

    willie59 - can you confirm the impression I've gotten from reading everything I can find about the aux system in the service manual? Here's the page from the manual that details removing the coil and valve, with some surprisingly good pictures compared to the rest of the manual...
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    Bobcat 863 - Electrical issues preventing aux usage

    Thanks Lowe.Buuck. How would I check whether the spools are stuck? Don't see anything in the service manual for it. Just unscrew the bolt at the top, remove the solenoid body, and check if the inner rod moves freely? If this ends up being the PWM controller, I'd rather not replace it right now...
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    Cracked hydraulic pump on an 863 - how to avoid a repeat?

    Thank you all for your help. I installed the new pump last night, and everything seems great. No leaks so far. That pump is an enormous pain to install, but we got it on! Drive/lift/tilt all okay, relief valve working as expected. Ya'll saved me a great deal of trouble trying to confirm the...
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    Bobcat 863 - Electrical issues preventing aux usage

    Hi folks! Hoping you can help me with one (last?) problem on my 863 C-Series: When I engage the aux system, it doesn't work and the light flashes. This is the exact sequence I'm seeing: Machine on (engine running or not; doesn't appear to matter). BICS enabled (whether through sitting in the...
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    Cracked hydraulic pump on an 863 - how to avoid a repeat?

    I'll discard that post as noise, then. Really appreciate you lending your experience to help me here. So the procedure for the pressure/relief test is to use a tee to get a pressure gauge inline with one of the tilt cylinder lines, then move the bucket around such that I slowly add load &...
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    Cracked hydraulic pump on an 863 - how to avoid a repeat?

    Thank you so much John. Regular end-of-life behavior is exactly what I hoped to hear. I have the full service manual. It specifies two ways to check the pressure. One is to attach a Bobcat tool to the two aux quick couplers, and then restrict the flow using a valve to slowly raise the pressure...
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    Cracked hydraulic pump on an 863 - how to avoid a repeat?

    I should add - this is the post (on another forum) that has me scared: http://www.skidsteerforum.com/DesktopDefault.aspx?tabid=54&frmView=ShowPost&PostID=86010 It's a horror story of replacing a pump and then immediately blowing up the new one, but there was never really a resolution posted...
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    Cracked hydraulic pump on an 863 - how to avoid a repeat?

    Thanks John! Here are some answers to some of your questions, in no particular order. I appreciate your help so much! The service manual specifies 3000 PSI for the relief valve adjustment Total hours are ~6100 right now. I believe the pump was original; the manufacturing date on it was 1997 -...
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    Cracked hydraulic pump on an 863 - how to avoid a repeat?

    I have a 1997 Bobcat 863 which cracked the hydraulic gear pump. I found that and have a new pump on order, arriving in a couple days. Now I'm trying to figure out what could have caused this issue in the first place. The crack goes directly through one of the bolt holes holding the pump onto...
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    • Thread
    • bobcat bobcat 863 hydraulic relief valve
    • Replies: 11
    • Forum: Skid Steers
  13. L

    Bobcat 863: Help a noob locate / fix a leak near the hydrostatic pump

    The pump itself was cracked: I'll replace it.
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    Bobcat 863: Help a noob locate / fix a leak near the hydrostatic pump

    Hi folks! Hoping you can help me with an 863, for which I've suddenly inherited care-and-feeding responsibility. Here's what I know: It's been leaking small amounts of hydraulic oil out of the back of the oil pan for a while, with no apparent operational issues (other than, ya know, leaking oil...
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