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1994 cat 928f rear end leaking?

Discussion in 'Wheel Loaders' started by brendin, Aug 17, 2019.

  1. Nige

    Nige Senior Member

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    By not going through the procedure I suggested above you did not remove any residual pressure in the brake system between the cab and the axle, so there is no way of telling how much pressure you had in the system that could cause oil to leak into the rear axle. Just saying.
     
  2. Nige

    Nige Senior Member

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    Axle oil cooling is optional on some Cat loaders but not on this particular model.
    No differential lock fitted.

    The cutout pressure for the brake accumulator charging valve is 2100+/-50psi. Pressure testing with a Portapower to anywhere over 500psi and watching the pressure decay IMO would indicate whether the brake piston seals were leaking big time or not.
     
    Last edited: Sep 10, 2019 at 12:22 PM
  3. brendin

    brendin Active Member

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    I didn’t have time to do all that when I was there. I’m going to try today. But if there was no leak wouldn’t there always be pressure from the cab to the axel? So by pressing the pedal till the pressure is gone am I not just pushing all that fluid into the axel from the brakes?
     
  4. kshansen

    kshansen Senior Member

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    I was thinking about that too! Pump up to even 300 psi and see if it drops off. With the reported leaking I'm thinking just trying to build any pressure will not be easy!
     
  5. Nige

    Nige Senior Member

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    The idea is to release pressure from the brake hydraulic system accumulator THEN drain the axle oil to the correct level and monitor the level for a couple of days.
    And my apologies - I got the sequence the wrong way round (I set to set the axle oil level then release brake pressure) when I told you the first time.
     
  6. brendin

    brendin Active Member

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    No worries. I’m going to run it for a bit in the next couple days then I’ll pump the brakes till there feels like there is no pressure then I’ll set the oil. Now if it is still leaking oil into the axel is there anything else that could be the problem or is it my brake seals and I just need them fixed.
     
  7. brendin

    brendin Active Member

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    Ok guys so Ive decided to just re build the brake seals and see if anything else needs and work in the axle. im going to be keeping this loader for a few years to come so the investment is worth it to me. now i need some help with a service manual. Or if you guys could give me some guidance on how to get the rear axle removed. Serial number for my machine is 2xl00721. 1994 Cat 928F. I have lots of big lifts and equipment to move everything around and lots of blocking to safely get the machine up. Any help would be awesome. Thanks.
     
  8. kshansen

    kshansen Senior Member

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    Guess my question would be are you just wanting to get the axle out or do you plan on attacking the problem yourself? If just needing to drop axle start a conversation with me and I'll see how big a file that would be.

    If you are planning on keeping this machine for a "few years" it may be to your advantage to invest in a service manual for it.

    You can go to "https://www.servicemanualpro.com/" and do a search under your serial number and down load a manual for $410.00. or order a paper version for $672.00. I believe there is someplace in that process where it will ask you to"Log on" but there should be an option to "Continue As Guest".

    I think the $410.00 will seam cheep compared to what the dealer will be asking just to disassemble and reseal that axle and even if you do still let them do that work I would guess that over the next several years the book will pay for its self.
     
  9. brendin

    brendin Active Member

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    for now im just planning on getting the axle dropped out of the machine. A friend of my dad works at cat here and is going to give me a great deal on rebuilding it depending on what is all wrong. I will be purchasing that service manual asap. there a huge help. how do i start a conversation with you? im pretty new on here not sure how it all works. thanks.