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Thread: JCB 801.4 Rotary Joint

  1. #1

    JCB 801.4 Rotary Joint

    Hi this is my first post, I have done some searching and have drawn a blank so sorry if this had already been covered. I have a 1996 JCB 801.4 which I owned for a few months for a renovation, the last owner had it for 12 years but only did 25 hours in that time, it currently has 3400 hours.

    Last week I was digging a soakaway and lifted the blade to move and it slowly dropped again. It would lower fine and lift the machine but not stay up. I then noticed a hefty leak from the undercarriage but didnít have time to look further. A few days later I started her up and the blade worked fine but the dripping leak was still there but not as bad. All the hoses looked fine and although difficult to see I narrowed it down to hydraulic oil seeping from the top seal of the Rotary Joint. Although I have no plant experience I consider myself reasonably handy. Can anyone tell me how easy they are to remove and do you need any specialist tools? There is little space around the rotary joint and it looks a pain to access. I am hoping a good clean and a new seal kit might do the trick, either that or just keep topping up the oil until it gets too bad. Once refitted will it need bleeding? If anyone can point me towards a maintenance manual that would be great.

    On another note I get a grinding noise coming to a stop having been using the slew in either direction, I guess something to do with the slew brake? All the bearings are well greased, apart from that it does everything it should, thoughts?

  2. #2
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    Quote Originally Posted by Bradders8014 View Post
    Hi this is my first post, I have done some searching and have drawn a blank so sorry if this had already been covered. I have a 1996 JCB 801.4 which I owned for a few months for a renovation, the last owner had it for 12 years but only did 25 hours in that time, it currently has 3400 hours.

    Last week I was digging a soakaway and lifted the blade to move and it slowly dropped again. It would lower fine and lift the machine but not stay up. I then noticed a hefty leak from the undercarriage but didnít have time to look further. A few days later I started her up and the blade worked fine but the dripping leak was still there but not as bad. All the hoses looked fine and although difficult to see I narrowed it down to hydraulic oil seeping from the top seal of the Rotary Joint. Although I have no plant experience I consider myself reasonably handy. Can anyone tell me how easy they are to remove and do you need any specialist tools? There is little space around the rotary joint and it looks a pain to access. I am hoping a good clean and a new seal kit might do the trick, either that or just keep topping up the oil until it gets too bad. Once refitted will it need bleeding? If anyone can point me towards a maintenance manual that would be great.

    On another note I get a grinding noise coming to a stop having been using the slew in either direction, I guess something to do with the slew brake? All the bearings are well greased, apart from that it does everything it should, thoughts?
    Hi Bradders welcome. The rotary joint is simple enough. But be certain it is that thats at fault first, and that the oil isnt coming from somewhere higher up. Manys a job has been a red herring until you are certain where the leak is .. Sounds like you are fairly certain, but just double check. Theres quite a few seals and rings in there, just be methodical in your strip, and above all colour code using coloured bag ties or similar EVERY hose you take off from the joint input on the top, to all the ones down the side, they are very easy to mix up and could take a while to sort back out
    Please don't PM me for plant advice.. thanks .. Post in the forum where I will gladly help, as will many of our contributors.. as the info and responses will help everyone else, which is why we exist

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