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Implement Alley Discussion Forum

Hydraulics - Loader

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Boyde from Bram

05-08-2007 07:08:21




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I posted this message over on the Ferguson board, thought I would try here as well.

I have a Shawnee loader on my tractor.

I blew a hydraulic line. I replaced the hose. I drained the hydraulic oil and replaced it with Hydraulic Fluid, an off the shelf brand.

I cycled the loader a few times.

Since the replacement of the hydraulic oil I have less power.

Symptons:

Lift is weak and slow,
Down pressure is weak, use to be able to lift the tractor off the ground, now cannot,
With bucket in up position and I enage the down pressure the bucket drops quickly,
Before with a heavy load the tractor engine would bear down, now the engine stays pretty much the same and the lift just slows down further.

Do I have the wrong fluid? It feels like the pump is pumping water.

The little manual that I have describing how to install the loader, suggests to use only Shawnee Hydraulic Oil.

Any help will be greatly appreciated.

Boyde

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Boyde from Brampton

05-09-2007 05:50:22




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 Re: Hydraulics - Loader in reply to Boyde from Brampton, 05-08-2007 07:08:21  
Thanks for the advice.

Here is what I am going to do this weekend, I 'll report back with any results.

After studing the few pages of a manual that I have, in the trouble shooting page there is a mention of a "strainer". I will examine this rig again and see if I can identify where it might be, if I find one I shall clean it.

The relief valve is a ball, setting in a seat. I shall adjust the adjusting screw in and out and make sure I put it back to the exact location. If the spring is stuck, maybe this will free it up.

I shall replace the blown hose. Fill the resovior with a Hydraulic Oil ISO 32.

I shall loosen each coupling one at a time at the cylinder after applying pressure to that hose to expell any air.

I shall tighen everything down (double check), then cycle the cylinders, fully 6 times.

Then we shall see what I have.

Did I miss anything?

Regards
Boyde

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plowboy1

05-09-2007 19:04:46




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 Re: Hydraulics - Loader in reply to Boyde from Brampton, 05-09-2007 05:50:22  
Sounds like a plan Boyde! However, if you do all these at once, will you know which one solved the problem?



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Boyde from Brampton

05-10-2007 07:34:10




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 Re: Hydraulics - Loader in reply to plowboy1, 05-09-2007 19:04:46  
You are right I will not know which activity fixed the problem, but as long as the problem gets fixed. I will know for the future to perform all this procedure when I replace oil. Once I know the pattern, I can follow it in the future.

Boyde



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plowboy1

05-08-2007 19:04:54




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 Re: Hydraulics - Loader in reply to Boyde from Brampton, 05-08-2007 07:08:21  
Does the pump sound different? Maybe you got air in the system that hasn't worked it's way out yet.



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Boyde from Brampton

05-08-2007 14:58:16




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 Re: Hydraulics - Loader in reply to Boyde from Brampton, 05-08-2007 07:08:21  
Thanks for the questions.

The replaced hose and fittings are the same as the one removed.

I did not run it while the reservar was empty.

I put in a standard type of hydraulic fluid. The little manual did suggest hydraulic oil. I have since found out that hydraulic oil is thicher than hydraulic fluid.

Someone suggested the relief valve. Any idea how to check that?

At the moment I am planning to try a Hydraulic oil ISO 32, unless I get different advice. At least the can says hydraulic oil.

This is part of the fun with these old machines, figuring out how to keep them running and exchanging ideas with you folk.

Boyde

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old

05-08-2007 15:13:37




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 Re: Hydraulics - Loader in reply to Boyde from Brampton, 05-08-2007 14:58:16  
It easy to check the relief valve if you have a gaige hooked up to the system but with out it pretty much can't be done. The thicker oil will most likely help it out if not then its time to get a gauge and hook it up and see what type of pressure you have in the system



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Boyde from Brampton

05-10-2007 07:36:15




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 Re: Hydraulics - Loader in reply to old, 05-08-2007 15:13:37  
I just ordered a Hydraulic gauge off of ebay.

Where in the system would I plumb this gauge?

Boyde



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old

05-10-2007 08:11:21




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 Re: Hydraulics - Loader in reply to Boyde from Brampton, 05-10-2007 07:36:15  
The wya I did it on my Ford 841 with loader was to put a pipe T in the line just before the valve body. We put that gauge in the T and that way any time you pull one of the control levers you see what pressure you have going to the cylinders. Thne when the cylinder reaches the end of its throw you will get max pressure reading. That reading will tell you what the relief valve is working at. On my 841 it reads around 2000psi

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old

05-08-2007 08:34:42




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 Re: Hydraulics - Loader in reply to Boyde from Brampton, 05-08-2007 07:08:21  
First off did you by chance run the pump dry on fluid when the hose broke?? If you did even for 5 minutes or less you may have damaged the pump. Also if you got the run of the mill universal hyd oil its thinner then a good number of oils. You may need to try some hy-tran type oil which is thicker since its made to work in both hyd systems and trannys/rear ends. A simple way to check out for sure where the problem is, is to buy a hyd gauge and plumb it into the system. That will tell you real fast if its the pump and or even the releif valve which could also be sticking

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jr150hp

05-08-2007 07:57:41




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 Re: Hydraulics - Loader in reply to Boyde from Brampton, 05-08-2007 07:08:21  
i've heard that at sometime they would put a 30 wt oil in them if that what was in it before you could have really thinned it out. But lets start with the replaced hose! same size same fittings . a smaller fitting or different fitting could cause this also. JR.



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BCnT

05-08-2007 07:41:25




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 Re: Hydraulics - Loader in reply to Boyde from Brampton, 05-08-2007 07:08:21  
could be your pump is worn and oil you had in system was a heavier weight.



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