0t--hyster forklift debacle of 1958
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  1. #1
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    Default 0t--hyster forklift debacle of 1958

    so i swapped a mori seiki sl-1 lathe for a 1958 hyster challenger 50H lift truck--
    it last ran in 1990
    the 50H series were made from 1957 to 1979
    the heat engine in this unit is 162 cu in ford
    lift truck weight 9000 lb

    the nissan shop lift is 5500 lb rated--btw this nissan is superb in every respect

    in order to load the hyster on trailer it was necessary to drop counterweight

    my guestimate was truck subframe would couple rear axle/tires/steering apparatus
    allowing problem free lift off of counterweight

    as i removed the last of 6 ---one inch dia bolts securing counterweight--the forward frame dropped

    so the nissan was employed to lift frame 4 inches for blocking

    with intent to lift counterweight following frame leveling--
    as the truck frame lift progressed--an audible snap followed by heavy thud and 180 degree roll
    of counterweight was witnessed

    analysis of construction anatomy confirmed an unbelievable design error commited by usually
    dependable hyster-- the steering axle was fastened to counterweight---even more troublesome---all weight and
    travel shock force was borne by 6 threaded 1 inch fasterners with no structural element--such as load shelf
    or bracket incorporated into design to serve as primary load bearing feature--with threaded fastener serving as
    securing element with minimal load bearing intent

    i reviewed factory service manual issued 1976---hyster makes no reference to this engineering disaster--
    instructions for counterweight removal on later units clearly reference steering axle attached to truck frame

    pics snapped today
    Attached Thumbnails Attached Thumbnails 100_1976.jpg   100_1980.jpg   100_1982.jpg   100_1984.jpg   100_1985.jpg  


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  3. #2
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    That really is weird, I'll give you that, but it seems like even a cursory inspection prior to the surgery would have instantly revealed how the thing was constructed and what the outcome might be upon dissection of said counterweight and main machine.

    It's easy to be a Monday morning quarterback, so, as they say.."I'm just saying"!

    Stuart

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    I have a 1981 Hyster 50H with a 4 cylinder GM motor.

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    Going by my limited experience of Britih forklifts of the 70's when some pretty wierd things went on, and it seems the US was the same.

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    Post WW2 ,when stuff was impossible to find,forklifts were made with concrete counterweights,and sometimes the whole chassis of the lift was cast into concrete to give it a streamlined shape.......new owners were often surprised when a hard knock resulted in a big chunk out of the edge........Old trucks usually formed the basis of these forklifts.

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    Default hyster taildragger

    hyster built tricycle lift trucks with some success in market acceptance

    today i introduce the next generation--taildragger
    the innovative tail support is hilman skate modified to clamp to suitable load bearing structural member--

    in any event--the 50h hyster rehomes in my shop tomorrow
    Attached Thumbnails Attached Thumbnails 100_1997.jpg   100_1998.jpg   100_2004.jpg   100_2006.jpg   100_2007.jpg  


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  9. #7
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    It looks like the tie rod end on the steering cylinder may have suffered some trauma...half of it seems to have been amputated.

    Stuart

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    [QUOTE=atomarc;3718694]It looks like the tie rod end on the steering cylinder may have suffered some trauma...half of it seems to have been amputated.

    good pickup
    terminal end of steering cylinder ram was coupled to ball joint which activated yoke dedicated to tie rod motion

    it fractured when lift was applied to lift truck frame--then the roll over
    steering cylinder ram fully extended--around 12 inches--at fracture
    no damage to ram or cylinder is noted
    repair will consist of new fabricated clamping bracket
    Attached Thumbnails Attached Thumbnails 100_1987.jpg   100_1991.jpg   100_1992.jpg  


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