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Hydraulic problem

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DaveU

09-29-2011 20:21:21




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Hello,

I had a lot of good advice recently from you good people on this forum re my Case 410 tractor & plugs misfiring now Im hoping you can help me again.

This is a the first of 2 part question, to do with the hydraulic system, they may be related.

When I first bought this tractor, one of the 1st things I did was to drain the hydraulic fluid and replace the filter and breather. At the time, I noticed that the old fluid was milky and foamy.



Up to the present time, a few years later, the hydraulics seem a bit sluggish. So I uncoupled the rams from the front end loader so I could suck them in all the way, thinking this would get most of the fluid into the reservoir.

I then drained the fluid, and yes, it was milky. I replaced the filter and added new fluid, extended the rams all the way and topped up the reservoir. I raised and lowered the FEL and tipped the bucket a few times, all seemed well. However, I noticed there was leakage around the cover plate I was unable to buy a gasket from the Case dealer, so I had to make my own, unfortunately I used the wrong gasket material.

So I drained the fluid again much to my surprise, it was very milky! Did I not flush out the old fluid correctly, and this is due to leftover residual?

The second part of my question when I raise the FEL, theres a barely percptiple load increase on the engine. However, when I tip the bucket down, then bring it back up, there is a very noticeable load increase on the engine, and a very loud squeal coming from the hydraulic pump area. Any thoughts on this?

Thank you for your patience,

Regards,

Dave

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DaveU

10-11-2011 16:16:58




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 Re: Hydraulic problem in reply to DaveU, 09-29-2011 20:21:21  
Hi Jon,

Quoting Removed, click Modern View to see

I moved the restrictor to the other side, and that seemed to solve the "squealing" problem, also a noticeable reduction in engine load. Thanks very much for that. Haven't got around to flushing the system yet, hope to do that before winter.

regards

Dave



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DaveU

10-01-2011 12:02:03




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 Re: Hydraulic problem in reply to DaveU, 09-29-2011 20:21:21  
Hi Jon,

I was wondering about using diesel fuel for this, I'll certainly give it a try. Thanks a lot.

regards

Dave



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DaveU

09-30-2011 08:39:26




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 Re: Hydraulic problem in reply to DaveU, 09-29-2011 20:21:21  
Hi Jon.

Quoting Removed, click Modern View to see
Ok, that's probably what's happening. This tractor only gets used for occasional jobs around the yard, probably 10 hrs per year max. Can I substitute a cheaper fluid to use for the flushing - using hydraulic fluid for this could get a bit pricey?

Quoting Removed, click Modern View to see
There is a flow restricor in the line (on the return side). I don't get the get squeal when I dump the bucket, but when I bring it back up. Is it possible the restrictor is installed the wrong way around?

Thank you,

regards,

Dave

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jon f mn

09-30-2011 13:05:24




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 Re: Hydraulic problem in reply to DaveU, 09-30-2011 08:39:26  
Yes it sounds like the restrictor is on the wrong side. As far as flushing goes, yes you can use the cheapest oil for that. When I am restoring an old tractor that is real bad I will use a mixture of 75% diesel 25% oil and add a couple of juggs of fuel anti gel, that really absorbs the water well. But you shouldn't run it too long like that. I have never had a problem with doing damage with this system.

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Dennis Zembower

10-11-2011 09:24:36




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 Re: Hydraulic problem in reply to jon f mn, 09-30-2011 13:05:24  
third party image

Jon-Hydraulic fluid on my Case 310 is leaking around the backhoe hydraulic control valve for the boom. Will adding a stop leak to the fluid reservoir "fix" this? The system has not been flushed since I received the Hoe. I am thinking of using White Shepard stop leak, is this advisable? Or should I flush and empty the system first?

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jon f mn

09-30-2011 01:33:23




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 Re: Hydraulic problem in reply to DaveU, 09-29-2011 20:21:21  
It's common to take 2 or 3 flushes to get all the water out of the system if its really milky, plus if you don't use it much and get it hot enough to sweat out the condensation you will get milky oil every couple of years anyway. As far as the load increase for the bucket tilt, there is probly a flow restrictor in the line somewhere to slow the bucket tilt. This is very common on loaders with 1 bucket tilt cylinder or 2 small cylinders so they don't dump to fast and damage the loader or what you are dumping into.

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daveu

09-30-2011 11:45:05




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 Re: Hydraulic problem in reply to jon f mn, 09-30-2011 01:33:23  
Hi Jon,

My last message was meant for you - somehow I ended up replying to myself. Senior moment! Sorry.

Dave



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