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  1. #1
    Silver Member
    Join Date
    Jul 2004
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    135
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    Lady Lake, Fl.
    Tractor
    Jinma 284

    Default Frontend Loader Problem

    I repaired the hydraulic unit that operates the curl on the left side of my Koyker 160 frontend loader. Replaced a bent chrome rod and all the seals. Put it back together, topped off the oil and had no leaks. Used it for about an hour to move some large chunks of tree trunks. Again no problems. Two weeks later I had the loader about 4 foot off the ground while I used the bush hog to mow. After about 30 minutes the bucket started to tilt down. The curl unit was not holding. I had to constantly, about every 15 seconds, return the bucket to the up position. Anyone able to help with suggestions about how to look for what is wrong and how to fix it. Thanks, Pat

  2. #2
    Advertiser
    Platinum Member

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    Mar 2004
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    1,348
    Location
    Texas

    Default Re: Frontend Loader Problem

    Sounds like you have some more seals failing, we keep the cylinder rebuild kits.You can plug of 1- cylinder at a time to determine which one is leaking by

    You need to know the cylinder size 1-3/4" or 2"

    Tommy
    Affordable Tractor Sales
    "Your Jinma Parts Superstore"
    Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

  3. #3
    Silver Member
    Join Date
    Jul 2004
    Posts
    135
    Location
    Lady Lake, Fl.
    Tractor
    Jinma 284

    Default Re: Frontend Loader Problem

    By "plug off one cylinder at a time" do you mean take off each of the two flexable hoses that go into the hydraulic unit and plug the ends on them? Pat

  4. #4
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
    Posts
    17,342
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Frontend Loader Problem

    The spring center on that spool might be weak, or worn spool.

    When you remove the cyl hose, and cap them, be sure to remove the cyl clevis and pin from the loader, so only the one cyl is doing all the work. Check both cyl .
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  5. #5
    Silver Member
    Join Date
    Jul 2004
    Posts
    135
    Location
    Lady Lake, Fl.
    Tractor
    Jinma 284

    Default Re: Frontend Loader Problem

    Thanks, I'll try it tomorrow. Pat

  6. #6
    Silver Member
    Join Date
    Jul 2004
    Posts
    135
    Location
    Lady Lake, Fl.
    Tractor
    Jinma 284

    Default Re: Frontend Loader Problem

    Got me two 5/8th's bolts and started to plug the lines, threads on the bolts are too wide. Where can I get bolts with narrower thread. I'v tried Home Depot, Lowes, Ace Hardware and Tractor Supply. Pat

  7. #7
    Veteran Member Bob Rooks's Avatar
    Join Date
    Feb 2007
    Posts
    2,276
    Location
    Bothell & Silverdale, WA
    Tractor
    Yuchai Bulldozer

    Default Re: Frontend Loader Problem

    Quote Originally Posted by Jinma284 View Post
    Got me two 5/8th's bolts and started to plug the lines, threads on the bolts are too wide. Where can I get bolts with narrower thread. I'v tried Home Depot, Lowes, Ace Hardware and Tractor Supply. Pat
    Try metric bolts.
    Yuchai 306R dozer, Mustang 2040 skid steer, Mitsubishi MS035 Mini-Ex with four buckets and a rake, Trimble equipped 7' Dual Dozer with twin GCR-2 laser receivers, and a LiTW BH7600 back hoe (sold).

  8. #8
    Platinum Member
    Join Date
    Dec 2006
    Posts
    709
    Location
    Coastal Rhode Island
    Tractor
    Jinma 354, purchased 2007

    Default Re: Frontend Loader Problem

    Quote Originally Posted by Jinma284 View Post
    Got me two 5/8th's bolts and started to plug the lines, threads on the bolts are too wide. Where can I get bolts with narrower thread. I'v tried Home Depot, Lowes, Ace Hardware and Tractor Supply. Pat
    Usually the fittings are metric and are an even number of millimeters, so I would guess 16mm x1.5mm pitch if a 5/8" bolt looks close. The fittings tend to be the face seal type, where there is an o-ring in the face (i.e. the tip) of the male fitting that provides the seal. I think you'd have to put an o-ring in there too to get it to seal.

  9. #9
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    Mar 2004
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    Texas

    Default Re: Frontend Loader Problem

    Koyker used JIC fittings, you should be able to get a JIC cap, its either 6 JIC or 8 JIC,you leave the fitting in the loader, just take the hose loose

    Tommy
    Affordable Tractor Sales
    "Your Jinma Parts Superstore"
    Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

  10. #10
    Super Star Member Diamondpilot's Avatar
    Join Date
    Jan 2007
    Posts
    14,621
    Location
    Daleville, IN
    Tractor
    Jinma 254/284 Ford 861 Powermaster at work

    Default Re: Frontend Loader Problem

    Yep, Koyker loaders are JIC. I think its 3/8" hose and a # 6 fitting. If its 1/2" hose it should be a #8 fitting.

    Chris

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