455 no hydraulics
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    455 no hydraulics

    Fired up the 455 today to mow, backed it out of the shed then tried to move forward and nothing... no movement, no hydraulics for raise/lower deck or power steering. It made no sound or gave any clues. No leaks and I am pretty sure its fluid level is ok. Fluid is JD Hygard and JD filters with maybe 150 hrs since last change.

    Any ideas where to look first?

    Thanks!

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    bloodrunsgreen's Avatar
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    Check fluid level?

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    Quote Originally Posted by bloodrunsgreen View Post
    Check fluid level?
    Yup, it's good and looks/smells like its ok. It was moving fine initially then stopped.

    Thanks!

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    Did you make sure the drive shaft is connected to hydro? It sounds like the pump is not turning.
    3025e, D160 loader, Artillian Grapple, Forks, Hoe Bucket, Frontier Land Plane, Rotomec PDH300, Redline Systems 54 inch rock bucket, Heavy Hitch
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    Quote Originally Posted by 69project View Post
    Did you make sure the drive shaft is connected to hydro? It sounds like the pump is not turning.

    Have not checked it yet but that is one of the first things I was going to look at. The engine runs fine and has no load on it, seems like it could be the shaft/pump. I have not had it stripped down in a couple of years. Isnt there a soft coupling at one end? Cannot remember how it's assembled.

    At work now and hoping to jump into it when I get back home.

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    Allrighty.... turns out the engine to hydro drive shaft is NOT turning when the engine runs therefore no hydraulics. Looks like the pulley on the crankshaft is loose, the alt/water pump belt is not moving either.

    Any ideas what would cause this? Not sure how the lower crankshaft pulley is affixed to the crank.

    Thanks!
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    bloodrunsgreen's Avatar
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    Look at the drive shaft adapter/isolator that bolts it to the pulley, is it all together? (bolts there, broken off, or missing). There is one central bolt/washer that hold pulley onto crank/flywheel.

    look at the JD parts site, you will need to look at various sections to piece it together in your mind and printouts for your notes to help you figure out what is broken and needs fixing. Plus the parts if needed.
    Last edited by bloodrunsgreen; 08-13-2019 at 06:05 PM. Reason: added info, checked for typos
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    Quote Originally Posted by bloodrunsgreen View Post
    Look at the drive shaft adapter/isolator that bolts it to the pulley, is it all together? (bolts there, broken off, or missing). There is one central bolt/washer that hold pulley onto crank/flywheel.

    look at the JD parts site, you will need to look at various sections to piece it together in your mind and printouts for your notes to help you figure out what is broken and needs fixing. Plus the parts if needed.

    Yeah the driveshaft adaptor/isolator is intact and connected. Its definitely the pulley itself. Looks like I need to pull the seat pan off and check it out.

    Thanks!
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    George of Buford's Avatar
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    I had the same problem with one of my 455s. The pulley is a tapered fit to the driveshaft. There is no keyway or spline. The bolt got loose and the pulley would just spin. You just need to disconnect the driveshaft from the isolator. Then remove the isolator and tighten the bolt. Really tighten it good!

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    Tq spec for the crankshaft bolt is 85 lb-ft and the 3 driveshaft bolts are 30 lb-ft.

    Make sure the tapered mating surfaces are not damaged from slipping.
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