O.T.~ Trouble removing hydraulic pump from engine - Page 2
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  1. #21
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    Okay, crisis averted.

    Finally drove a couple of chisels in there and it popped loose.

    The pump side of the coupling half has an O-ring in a slot around it's outer diameter, as you can see in the picture.
    1.jpg 2.jpg 1..jpg


    I'm not familiar with this kind of coupling... what function does the o-ring perform.. does it slide right on in the female half and act as a "anti-fretting" shock absorber?

    I was rushed doing this.. didn't get to closely inspect, but in person and in the picture, the splines on both parts look like there was either rust, or red loctite in the splines... Maybe that was why it was so difficult to get apart.

    I do understand how they put it together.. install the two halves in their respective positions, the insert bolts in the adapter plate and use them to draw the plate to the bellhousing, thus forcing the two coupling halves together!

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    Got it running today. Took a few snorts of ether... took right off...

    YouTube

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    The red powder/goo is actually spline fretting steel powder(oxidized).......to stop spline fretting use a smear of pure moly dag ....a smear can save big maintenance and downtime expenses...The O ring is likely to contain a grease in the splined coupling,to stop fretting....There are many kinds of rubber cushioned couplings available ,a pump drive from a diesel without rubber is likely to be very noisy due to cyclic variation in a small diesel.

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    John is right. The O ring is to keep in the grease you did not have. That is pretty much half of a gear tooth coupling. The best grease for that would be the stuff Falk supplies for their grid segment couplings. They recommend service yearly with normal lubricating greases. With their coupling grease the interval is 3 years. It's thick, sticky, black, and almost permanent on you. I would recommend it.

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    Before you re-assemble it drill and tap some holes in the adapter plate for some jack screws.

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    Quote Originally Posted by Illinoyance View Post
    Before you re-assemble it drill and tap some holes in the adapter plate for some jack screws.
    It isn't necessary to remove the adapter plate. The coupling attached to the pump will fit thorough the hole machined in the plate. Simply remove the pump with the coupling half attached. Now that you know how it is assembled, you can confidently disassemble it.

    Stuart

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  9. #27
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    Quote Originally Posted by atomarc View Post
    It isn't necessary to remove the adapter plate. The coupling attached to the pump will fit thorough the hole machined in the plate. Simply remove the pump with the coupling half attached. Now that you know how it is assembled, you can confidently disassemble it.

    Stuart
    IF you grease it.

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