1. Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

Cat D8H help with parts breakdown for blade hydraulics

Discussion in 'Dozers' started by Liebherrman, Jan 13, 2020.

  1. Liebherrman

    Liebherrman Member

    Joined:
    Nov 23, 2015
    Messages:
    21
    Location:
    Pa..
    I don't know why my Caterpillar dealership sent me three different parts breakdown for the hydraulic tilt cylinder supply lines, and no other options for my 1969 D8H 46A dozer... my lines run up through the blade frame they could not find this parts breakdown Arrangement anywhere., does anybody have the parts breakdown? that would be great, I'm trying to get correct replaceable lines
     

    Attached Files:

  2. Nige

    Nige Senior Member

    Joined:
    Jun 22, 2011
    Messages:
    12,958
    Location:
    G..G..G..Granville...........!!
    Give the guys a fighting chance - Try quoting the tractor Serial Number and the S/N for the hydraulic control. The latter will be on a plate on the hydraulic tank.
     
  3. Welder Dave

    Welder Dave Senior Member

    Joined:
    Oct 12, 2014
    Messages:
    2,861
    Location:
    Canada
    Are they just hoses on your machine or steel lines as well?
     
  4. Liebherrman

    Liebherrman Member

    Joined:
    Nov 23, 2015
    Messages:
    21
    Location:
    Pa..
    I did give them both numbers.
     
  5. Liebherrman

    Liebherrman Member

    Joined:
    Nov 23, 2015
    Messages:
    21
    Location:
    Pa..
    It looks like there are steel lines that run up through the blade arm , but I didn't get in there yet, but there are rubber lines that connect that you can see in the picture, that snake around under the machine and up towards the control valve
     
  6. Bluox

    Bluox Senior Member

    Joined:
    Jun 20, 2010
    Messages:
    681
    Location:
    WA state
    they should be hoses.
    You need to give them your blade serial number.
    Bob
     
  7. Welder Dave

    Welder Dave Senior Member

    Joined:
    Oct 12, 2014
    Messages:
    2,861
    Location:
    Canada
    If you just need the hoses take 1 or both of them off and have new ones made.
     
  8. bccat

    bccat Well-Known Member

    Joined:
    Jun 12, 2010
    Messages:
    105
    Location:
    Squamish BC
    Can you get the serial # off the blade?, also the blade tilt cyl is an attachment, it is important to get the proper length of hose, it is listed in the parts break down. I wonder if the hoses are original could be.Cat used metal straps with the part # on it wrapped around the hose.when I changed hoses I would put the strap on the new hoses. Yrs ago I got a call about low hydraulic oil on a D8K, couldn’t find any leak, added 5 gal, still no visible leak, but the level went, finally found a small leak at the tilt cyl hose mounting bracket on the blade arm, the blade arm was completely full of hyd oil. Come to find out the hoses were over half as long as they needed to be & were rubbing on the arm, was a mess. Learned something that day. Check the hoses for that metal strap
     
  9. Metalman 55

    Metalman 55 Senior Member

    Joined:
    Feb 7, 2013
    Messages:
    1,128
    Location:
    Ontario
    Diddo here...We had the same thing happen many years ago......hyd oil level dropping & no apparent leak on the D8K, add oil, no external oil leaking, but level dropping, add more oil, no leak.....must have added 20 gallons & still no leak...…….we thought we were loosing our minds, then suddenly the leak started coming out the RH arm & the puzzle pieces fell into place!! If I remember correctly, it was rubber hoses only, no steel lines in there......almost 40 yrs ago, so the memory tends to fog a bit. Will never forget that incident though!!
     
    mikebramel and John C. like this.
  10. Jonas302

    Jonas302 Senior Member

    Joined:
    Jan 4, 2015
    Messages:
    580
    Location:
    mn
    I tie a rope on the hose before I pull it though from the control valve or blade arm
     
    56wrench likes this.
  11. excavator

    excavator Senior Member

    Joined:
    Oct 16, 2006
    Messages:
    884
    Location:
    Pacific North West
    I think maybe Nige is referring to us. Please post the serial numbers for us.
     
    Nige likes this.
  12. Old Magnet

    Old Magnet Senior Member

    Joined:
    May 11, 2010
    Messages:
    1,461
    Location:
    Corralitos, California
    Cat did right, there are three different hose connection lengths depending on blade s/n and tilt cylinder part number and tractor s/n. Choices are 48.40 ", 37.80" and 38.47"
     
  13. Liebherrman

    Liebherrman Member

    Joined:
    Nov 23, 2015
    Messages:
    21
    Location:
    Pa..
    Great info!.. I was wondering what would happen if one of the lines burst inside the beam! Haha.. unfortunately the serial tag is not on the blade anymore I see a lot of the Elite Series H's and K's had the same arrangement, someone already replace these lines and are way too long and hodgepodge and mounting bracket missing I want to get it back to correct specs, so I'm going to insist my Cat Dealer parts man keep on digging. If he can't I guess the next step is to find a serial number from the same blade elsewhere
    Is there anybody out there that has the same Blade with a serial number that they could let me borrow? Here's another picture
     

    Attached Files:

  14. Liebherrman

    Liebherrman Member

    Joined:
    Nov 23, 2015
    Messages:
    21
    Location:
    Pa..
    Great advise!..thank you
     
  15. Liebherrman

    Liebherrman Member

    Joined:
    Nov 23, 2015
    Messages:
    21
    Location:
    Pa..
    I have the machine serial number and the hydraulic tank serial number is that enough? Because I don't have the blade serial number
     
  16. Liebherrman

    Liebherrman Member

    Joined:
    Nov 23, 2015
    Messages:
    21
    Location:
    Pa..
    Wow good info., I need to keep digging
     
  17. Nige

    Nige Senior Member

    Joined:
    Jun 22, 2011
    Messages:
    12,958
    Location:
    G..G..G..Granville...........!!
    Based on the info supplied by other posters it appears as though the blade S/N appears to be the key factor in determining what is the correct P/N & length for these particular hoses. My first thought was that the hose Part Numbers could be traced via the S/N of the hydraulic control but obviously I was not correct in that assumption.
    Maybe I was a bit cryptic in my first post but yes I was asking you to post the S/N's here so that people like OM who have lots of Cat Parts information from that era could chime in.
     
  18. Bluox

    Bluox Senior Member

    Joined:
    Jun 20, 2010
    Messages:
    681
    Location:
    WA state
    The easiest would pull the old hose out and have 2 new ones made ,I don't think Cat even make the old style anymore.
    If your just looking for the hose inside the push arm it should be a dash 8 , 12 feet long with 8 jic swivel on both ends.
    Have Cat try a 44K or 45K blade for a parts list.
    Good luck
    Bob
     
  19. Old Magnet

    Old Magnet Senior Member

    Joined:
    May 11, 2010
    Messages:
    1,461
    Location:
    Corralitos, California
    Scratch around in the paint where the blade s/n tag would be . Good chance the s/n is stamped there. At least get us the tractor s/n
     
  20. gary808

    gary808 Well-Known Member

    Joined:
    Oct 8, 2009
    Messages:
    215
    Occupation:
    operator,maintanence ,fabricator
    Location:
    hawaii
    If it’s just hoses take them out and find a hose shop and have new ones made up. Or you can measure them and get hose assembly’s from surplus center for cheap.
    Look like jic10 1/2 hose.