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  1. #1

    Default Hydraulic Tip

    Cylinders are less complicated than most other types of
    hydraulic components and are therefore relatively easy
    to repair. As a result, many hydraulic equipment owners
    carry out these repairs themselves.

    An important step in the repair process that is often skipped
    by DIY repairers, is the checking of rod straightness. Bent
    rods cause distortion, and ultimatley premature failure, of
    the rod seal(s).

    Rod straightness should always be checked when a cylinder is
    being re-sealed or repaired. This is done by placing the rod on
    rollers and measuring the run-out with a dial gauge. The rod
    should be as straight as possible, but a run-out of 0.5
    millimeters per linear meter of rod is generally considered
    acceptable.

  2. #2

    Join Date
    Jul 2001
    Posts
    1,806
    Location
    Houston, TX.
    Tractor
    2001 TN65, 1951 8N Ford

    Default Re: Hydraulic Tip

    The less sophisticated among us can use a flat table top. Lay the rod on it and roll it. You can easily see whether it's straight or if it wobbles. I kept a flat side window out of a van around for stuff like this and for checking cylinder head flatness and sanding flanges flat.

  3. #3

    Join Date
    Dec 2001
    Posts
    121
    Location
    So. N.H
    Tractor
    long 300dtc

    Default Re: Hydraulic Tip

    Hi Hydraulicman i bent my cylinder on my back hoe last year
    replaced it with a new one my question is can i have the bent one straighten to with in 0.5 mill. from a machine shop and use for temp until new one is picked up
    thanks EDT

  4. #4

    Default Re: Hydraulic Tip

    In most cases bent rods can be straightened in press - although rechroming will usually be required afterwards.

    If the rod has an "s" bend in it, then its harder to straighten
    and may need to be scrapped.

  5. #5
    Platinum Member
    Join Date
    Mar 2002
    Posts
    572
    Location
    Jackson County, Michigan
    Tractor
    Bolens HT-20

    Default Re: Hydraulic Tip

    For 'a' reason, the swing cylinder shaft got bent on the bh. I turned it 180* on it's pin and swung the bh 'till it straightened out. The second step was to put a stop in place to prevent the overswing. That's been about 2 years ago and much use. I think I got lucky.

  6. #6

    Join Date
    Dec 2001
    Posts
    121
    Location
    So. N.H
    Tractor
    long 300dtc

    Default Re: Hydraulic Tip

    Thanks hydraulicman i think i will have it straightened and see how it looks
    Thank EDT

  7. #7
    Platinum Member dourobob's Avatar
    Join Date
    Mar 2002
    Posts
    670
    Location
    Just West of Buckhorn, Ontario, Canada
    Tractor
    Wheel Horse 522xi

    Default Re: Hydraulic Tip

    Hi mrcaptianbob
    How far was the swing on your cadplan digger. I remember you wanted to get it up to about 180 degrees - a little more than the plans called for. Is that what caused the problem or was this before you made any adaptations. My buddy and I are just beginning to assemble the pieces of an 821 digger we have been working on over the winter and I am wondering if we should consider a 'stop' on th swing cylinder.

    Douro Bob

  8. #8
    Platinum Member
    Join Date
    Mar 2002
    Posts
    572
    Location
    Jackson County, Michigan
    Tractor
    Bolens HT-20

    Default Re: Hydraulic Tip

    Unfortunately, I haven't done the 'remodel' yet. We're now in the throws of lookin' for another dwelling, so many of my projects are on hold. I did, however put a stop in place to keep it from bending the shaft again. It happened only when swinging to the right and hitting the center post before the shaft wasw fully extended. Swingin' left is no problem. I lost maybe five degrees.

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