Hydraulic leak in JCB 3C mk II

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Robertt
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Hydraulic leak in JCB 3C mk II

Post #1 by Robertt » Sat Jun 30, 2012 8:14 pm

Help please
My 1975 3C11 is leaking a lot of hydraulic oil from the overflow(?)pipe on the bottom of the king post, it usedto be the occasional drip now its almost a stream, I added a gallon of oil this morning, and it now needs another gallon, how do I fix it?
Also the steering seems to have taken a holiday, sometimes it work, others its very stiff, and others the steering wheel is for decoration only


Jeremy Rowland
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Re: Hydraulic leak in JCB 3C mk II

Post #2 by Jeremy Rowland » Sat Jun 30, 2012 8:56 pm

Hi Robert and welcome to the site :wave: is there any chance that you could post a photo of the actual pipe that is leaking and its exact location as this helps forum members to give advice?

Jeremy


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Re: Hydraulic leak in JCB 3C mk II

Post #3 by philwheelton » Sat Jun 30, 2012 9:20 pm

I would say it's the over flow pipe from the slew gearbox and the slew seals are leaking, is it a plate with 4 bolts round it? If so new slew seals are needed,there should be gear oil in the base of the king post the bolt in the pipe is also a dip stick, as for the steering if the hyd oil is low the steering will stop working first.

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TullyveeryClassicJCB
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Re: Hydraulic leak in JCB 3C mk II

Post #4 by TullyveeryClassicJCB » Sat Jun 30, 2012 9:25 pm

Thats not hydraulic oil. Thats lubrication oil for the actuator (slew). Mine usually only overflows when it gets full of water or I over fill it with oil.

Your steering pump isn't getting enough hydraulic oil. Clean out the steering pump strainer. Its inside a cuboid shaped filter housing in front of the radiator. Its metal in material so no need to replace it just clean it and your steering should be fine.
William

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Topic author
Robertt
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Re: Hydraulic leak in JCB 3C mk II

Post #5 by Robertt » Sat Jun 30, 2012 9:40 pm

As requested I have attached a photo of the offending bit,
I suspect Phil is right, as when i took one of the ram covers off I got a bucket full of mainly hydraulic oil
Also Tully - Thanks it has been steering erratically,sometimes easy sometimes stiff (or maybe I forgot the weetabix), sounds like a dirty filter so will try that.
To say its nearly 40 years old it has performed brilliantly, apart from the above, I bought it to dig a 60 x 40 foot hole upto 7 feet deep at one end for a big shed,after I was quoted 5k, so saved money and had a great time, Now, if I can just get the last 10% dug, I can get the sehd built, then Have somewhere dry to work on it properly
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philwheelton
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Re: Hydraulic leak in JCB 3C mk II

Post #6 by philwheelton » Sat Jun 30, 2012 10:17 pm

you need to remove the slew pots and replace the seals don't forget to fill the slew box back up with HD90 gear oil when you put it back together!


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Re: Hydraulic leak in JCB 3C mk II

Post #7 by svkenn » Mon Jul 02, 2012 10:53 am

hi all, i have the same problem with a mk11. but not able to track down any seal kits, tryed digger parts and a few places on ebay but no luck. easy job to do. so anybody knows where they can be located? cheers


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Robertt
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Re: Hydraulic leak in JCB 3C mk II

Post #8 by Robertt » Mon Jul 02, 2012 6:43 pm

I've also found the same problem, no one seems to think they stock the seals Does anyone have a proper part number as I suspect there will be a new equivalent available if it can be traced

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Re: Hydraulic leak in JCB 3C mk II

Post #9 by Mark.Rive » Wed Jul 04, 2012 9:46 pm

I've uploaded this before, but here you go. All you will ever need to know about JCB MKII & III ram seal part numbers. Good hunting Mark :thumbup:
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Topic author
Robertt
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Re: Hydraulic leak in JCB 3C mk II

Post #10 by Robertt » Wed Jul 04, 2012 10:10 pm

Jakespare Codecote has got some, I've ordered a pair for about £36 including postage, will update when they arrive. All he needed to know was whether it was a 4.5 inch or 5 inch ram - apparently size does matter!


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