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Thread: refurb the pump

  1. #1
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    refurb the pump

    Hi guys

    how big a job is it to refurb the hydraulic pump on my machine? (jcb 8014) pics on previous thread.

    I am looking to go through the machine with a fine tooth comb and put all the little niggles right like a dipping bucket.

    Where's the best place to get a service manual? anyone got one on PDF?
    Last edited by Rob-b; 06-06-2012 at 09:30 AM.

  2. #2
    Admin Muz's Avatar
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    Pumps surprisingly arent that expensive to buy, this is a good company here based on Port Glasgow Ive had several units from them over the years. However the originals can run satisfactorily for many years, you should have it tested to see what pressure it puts out, and that will tell you if its down on pressure, and needing replaced but you'll need a machine shop that carries the correct guages to test it. The procedure for changing is very simple, its just a bolt on unit.

    Ive only ever had to do 3 in 20 years from hundreds of diggers if thats any guage of failure for you. As for service manuals you'll just need to keep hunting, dunno if anyone here has any for that machine?, its probably the only digger I dont have one for ! There will be sites offering them ok but most will be pay services I expect
    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

  3. #3
    Quantity Surveyor on the up ianoz's Avatar
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    Myself , I would be doing a pressure test ,See what it is putting out .If you are only using it as a round the yard machine ,not putting it on hire work .A bit lower than spec should not be much of a problem .
    My old boss had Mustang 440 skidsteer loaders ..He had a set of pumps rebuilt ,and the rebuilder said they tested at 85% once rebuilt . Boss said that is good enough , Reason being the rest of the machine , Had wear / age to it , so less chance of something failing .

  4. #4
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    Been on it today and the reason I say the pump is I've noticed that when I steer it with say more power to one of the tracks it dies a wee bit, but that may be me not having enough revs on, I work it at around 1/4 revs? don't get me wrong it goes ok and when I equalise the track ie both full on it travels no problem.

    I may be a bit picky here to think it is going to operate like a new machine and even the dipping bucket isn't that big a deal, so yes it just for around the garden and if I refurb the pump it maybe to strong for other components, if it's not broke eh?

  5. #5
    Admin Muz's Avatar
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    Bung the revs up to full makes it run faster but thats the way they are supposed to operate. No bodys saying you cant run it slower, just that they are designed to run at full revs, you feather the controls for less speed with the machine, but it only gives full operating power at that speed.

    Now the tracks might have another problem, if it tracks off to one side, when you try to go straight or one has less power, it could be 3 things, the first might be the pump as you suspect, but you need to check, it will be a gear pump, and if its just a single section pump, this wont be the problem, because there will only be one feed into the valve block,but if its a double or triple section gear pump, one of the banks could be down in pressure, giving two or three different pressures into the valve block. Secondly it could also be a spool thats not allowing full pressure, but more commonly a relief valve blowing off too soon, and not allowing full pressure in that circuit. The 3rd and most sinister reason is the rotary distributer valve allowing oil to bypass some seals in the valve. This is the unit right in the centre of the machine that allows atleast 6 oil lines to deliver oil to the tracks and dozer blade whilst the machine rotates in any 360 direction. Theres a bundle of nylon rings and 'o' rings in this unit that wear and eventually leak and allow oil to by pass to a return line. If it operates half decent, I'd leave well alone cos its a bit of a pig to get that out, split it and reseal it, will be about 30 seals in it, depending who made it thats not to say it cant be done, but its a bit of a fight
    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

  6. #6
    This isn't a huge job at all. You could look here http://www.pdfbookmanual.net for the 8014 manual? Otherwise I can only echo what's been said above - and refurbing the pump shouldn't affect the rest of the components. There's a decent excavator maintenance place here if you don't manage to sort this yourself.

    Let us know how you get on Rob.

  7. #7
    Admin Muz's Avatar
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    Quote Originally Posted by joe_g_ View Post
    look here http://www.pdfbookmanual.net for the 8014 manual?
    Hi Joe, welcome to the forum

    That link above looks like its just a sales brochure, or have I not looked properly, is there a workshop manual on there ?
    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

  8. #8
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    Quote Originally Posted by Muz View Post
    Bung the revs up to full makes it run faster but thats the way they are supposed to operate. No bodys saying you cant run it slower, just that they are designed to run at full revs, you feather the controls for less speed with the machine, but it only gives full operating power at that speed.

    Now the tracks might have another problem, if it tracks off to one side, when you try to go straight or one has less power, it could be 3 things, the first might be the pump as you suspect, but you need to check, it will be a gear pump, and if its just a single section pump, this wont be the problem, because there will only be one feed into the valve block,but if its a double or triple section gear pump, one of the banks could be down in pressure, giving two or three different pressures into the valve block. Secondly it could also be a spool thats not allowing full pressure, but more commonly a relief valve blowing off too soon, and not allowing full pressure in that circuit. The 3rd and most sinister reason is the rotary distributer valve allowing oil to bypass some seals in the valve. This is the unit right in the centre of the machine that allows atleast 6 oil lines to deliver oil to the tracks and dozer blade whilst the machine rotates in any 360 direction. Theres a bundle of nylon rings and 'o' rings in this unit that wear and eventually leak and allow oil to by pass to a return line. If it operates half decent, I'd leave well alone cos its a bit of a pig to get that out, split it and reseal it, will be about 30 seals in it, depending who made it thats not to say it cant be done, but its a bit of a fight


    Thanks Muz, appreciate that, I have noticed since that the whols boom sinks over night if left up so something is leaking, but it operates fine. I think I will leave it for now and do my work and when I go into the refurb mode look closer then.

  9. #9
    Admin Muz's Avatar
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    Quote Originally Posted by Rob-b View Post
    I have noticed since that the whols boom sinks over night if left up so something is leaking,
    TBH Ive had diggers do that after they are only three years old ...its not something I panick about unless the boom hits the deck in 10 minutes,say, then it becomes a safety issue, and something is seriously wrong, and I will pull it apart then
    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

  10. #10
    Site Agent Wee Jim's Avatar
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    I always park witht he boom on the ground, i do this with every machine as i feel it puts un needed stress on parts.

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