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  1. #1
    Veteran Member gordon21's Avatar
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    Feb 2006
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    1,005
    Location
    Lake Lure NC
    Tractor
    JD 790

    Default Changing hyd fluid--what about the fluid in the FEL?

    How do you handle a hydraulic fluid change when there is still several gallons in the cylinders of the FEL, log splitter, backhoe, etc? There will still be trapped old fluid in all these cylinders. I just filled the cylinders in my new log splitter and it took over 2 gallons for just that one cylinder. Therefore I assume there is another 8-10 gallons in the FEL and backhoe. That could mean 12 gallons of fluid that will not get changed. Seeing since the tranny itself only holds 4 gallons, that means I am replacing only 33% of the fluid. this does not sound right.
    Lewis Gordon

    JD 790, 300 FEL, 5' KK rotary mower, 5' boxscraper, Huskee 3PT logsplitter, JD#39N sickle mower and a Jinma 6" chipper in JD colors.

    My XUV gas Gator wants a brother !!!!!!!! (the diesel kind)

  2. #2
    Elite Member
    Join Date
    Mar 2006
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    3,059
    Location
    Wisconsin
    Tractor
    2003 NH TN70A

    Default Re: Changing hyd fluid--what about the fluid in the FEL?

    Quote Originally Posted by gordon21
    Therefore I assume there is another 8-10 gallons in the FEL and backhoe. That could mean 12 gallons of fluid that will not get changed. Seeing since the tranny itself only holds 4 gallons, that means I am replacing only 33% of the fluid. this does not sound right.
    I doubt my FEL has gallons in it. Maybe?
    Bob
    PS I chnaged 13 gallons of hydro fluid on my TN70A. Dilution is the solution!

  3. #3
    Silver Member
    Join Date
    Jun 2006
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    175

    Default Re: Changing hyd fluid--what about the fluid in the FEL?

    I understand your concern and do believe a significant volume of fluid is retained in the hoses, pump and cylinders. However, I would not be overly concerned unless there is contamination. Car automatic transmissions hold only about 4 quarts of fluid in the pan and filter with the other approximate 8 quarts in the rest of the system. I would flush the system in a smiliar way I flush automatic transmissions without expensive machinery. First drain and fill the sump. Then fabricate a hydraulic hose with only one fitting on the end to couple with the return line from the loader, backhoe ect. cylinders. Make the hose long enough to reach a bucket. Start with the cylinders retracted then extend the cylinders. Check the bucket and if you pump out a gallon, add a gallon to the sump. Reconnect the hoses then go to the next set of cylinders. Just be careful and not run the system dry.

  4. #4
    Gold Member
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    Jul 2005
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    313
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    pa
    Tractor
    Kubota L48 Kobelco sk100 Kobelco sko35 case 450 Mack R600

    Default Re: Changing hyd fluid--what about the fluid in the FEL?

    Don't be concerned with the little bit what is in the rest of the system even in the large dozers loaders and excavators we sell and service the only time we are concerned is if you have a major blow up in the system and have not had one come back with trouble in the last 33 years I have been a mechanic there

  5. #5
    Elite Member RalphVa's Avatar
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    Dec 2003
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    3,758
    Location
    Charlottesville, VA, USA
    Tractor
    JD 1025, previously Gravely 5650 & JD 4010

    Default Re: Changing hyd fluid--what about the fluid in the FEL?

    I think the main reason for a fluid change, particularly the one at 50 hours, is to drain off any fluid that has tiny bits of metal in it that didn't get filtered out and to also replace the filter that would have stopped bigger metal particles. I've "changed" fluid in my power steering on my car by just sucking out the old fluid and putting in new. All fluid in the lower system areas and hoses stayed there. Changing stopped seal oil fling. This is the major reason for the fluid change at 200 hours, just to get enough new stuff in there to replace the additives that have gone zonk to help keep the seals swelled and to remove oxidized oil.

    Ralph
    The natural gardener
    God's original intent

  6. #6
    Epic Contributor Soundguy's Avatar
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    Mar 2002
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    46,366
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    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Changing hyd fluid--what about the fluid in the FEL?

    Quote Originally Posted by gordon21
    How do you handle a hydraulic fluid change when there is still several gallons in the cylinders of the FEL, log splitter, backhoe, etc? There will still be trapped old fluid in all these cylinders. I just filled the cylinders in my new log splitter and it took over 2 gallons for just that one cylinder. Therefore I assume there is another 8-10 gallons in the FEL and backhoe. That could mean 12 gallons of fluid that will not get changed. Seeing since the tranny itself only holds 4 gallons, that means I am replacing only 33% of the fluid. this does not sound right.
    If you are real concerned about it.. get a cheapy 20$ bucket of utf from walmart.. change it with that.. cycle thru it for 20 minutes.. then change again with whatever oil you like.. only adds 20$ to the cost.. and you have diluted the 'old' oil down in the system by a huge factor..

    Soundguy

  7. #7
    Veteran Member daTeacha's Avatar
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    Oct 2005
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    2,352
    Location
    Funk, Ohio

    Default Re: Changing hyd fluid--what about the fluid in the FEL?

    But then your working oil is partially cheapy stuff that may or may not meet specs for your machine.
    Rich
    300 hours on the DX29, 850 on the JD 240 and too many to count on the Cadet
    Funk, Ohio

  8. #8
    Epic Contributor Soundguy's Avatar
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    Mar 2002
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    46,366
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: Changing hyd fluid--what about the fluid in the FEL?

    Obviously he needs to check his hyd specs before randomly dumping oil into it....If his tractor calls for UTF.. then he obviously needs to check the specs on the conatainer for what he adds.. if it calls for udt.. he's stuck.. I havn't found any cheap udt...

    I'd rather have inexpensive but properly spec'ed clean oil in my hyds than old, dirty, wet name brand oil in my hyds -ANY- day of the week.

    Soundguy

  9. #9
    Elite Member
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    Mar 2006
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    Location
    Wisconsin
    Tractor
    2003 NH TN70A

    Default Re: Changing hyd fluid--what about the fluid in the FEL?

    Quote Originally Posted by Soundguy
    Obviously he needs to check his hyd specs before randomly dumping oil into it....If his tractor calls for UTF.. then he obviously needs to check the specs on the conatainer for what he adds.. if it calls for udt.. he's stuck.. I havn't found any cheap udt...

    I'd rather have inexpensive but properly spec'ed clean oil in my hyds than old, dirty, wet name brand oil in my hyds -ANY- day of the week.

    Soundguy
    Ditto
    Bob

  10. #10
    Elite Member CurlyDave's Avatar
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    Dec 2005
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    4,081
    Location
    Grants Pass, OR
    Tractor
    JD TLB 110

    Default Re: Changing hyd fluid--what about the fluid in the FEL?

    I was about to post a similar question when I found this thread.

    There is a significant amount of oil in your attachments. I got a rock bucket with 2 grapple cylinders and a thumb with one cylinder a couple of weeks ago and was astonished to discover that my hydraulic fluid was 2 gallons low after installing them, with a nominal system capacity of 9.7 gallons.

    Somehow it seems to me that changing fluid in all the implements I have is going to be a PITA when change time comes, and I am wondering about a different strategy.

    What if I just drain the reservoir and fill it with inexpensive UTF, and keep doing this at about 1/3 the recommended interval. Sure, it is all going to get mixed up in the system, and I will never have 100% new oil, but I will have relatively fresh oil all the time.

    And, the cost is going to be about the same as for using name brand oil with a much more thorough drain & implement flush on a less frequent schedule.

    The way I have always understood oils is that the expensive synthetics can go longer between changes than dino oil, but wear is just about the same if I change the dino more frequently than the recommended interval.

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