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8N hydraulics
:

Pressure ?

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Tom_NC

03-09-2002 12:25:42




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I have a 8N and the other day I started to move some round bales with it. Had the MF135 tied up with another piece of equipment. The 8N would lift some of the bales but would not some others. Dug out the manual and after some reading checked the pressure at the external port while trying to lift a bale got about 1200PSI. Opened the inspection plate at dip stick and see no signs of leaks but the pop off is letting off pressure when trying to lift bale, it does not with a lighter load. The book says the system should do about 1500PSI before valve pops so I am thinlking about replaceing the valve. Can this be done through the inspection plate or will I have to drop the pump to do it? Any thoughts or suggestions would be greatly appreciated. Thanks in advance.

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ZANE

03-10-2002 05:28:13




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 Re: 8N hydraulics - Pressure ? in reply to Tom_NC, 03-09-2002 12:25:42  
The way I used to find out what the N was lifting was to put the load on the lift and then raise the lift. If the lift would not lift the load then I would go to the front bumper of the tractor with the lift trying and try to raise the front wheels off the ground myself. If I could raise the front wheels then the lift was doing all it could. If I couldn't raise the front wheels then the lift was not doing all it should.

One thing you need to consider when carrying the large round bales of hay around with the N tractor lift is that if you are moving over uneven ground and the lift is at it's maximum capacity you are taking a real chance of bursting the hydraulic pump housing. The relief valve is designed to prevent the pump from being burst from overload but is will not handle the extra volume and pressure that can be generated when an almost overload is bounced up and down on the lift arms. The reilef valve will only pass a certain amount of volume and anything over will greatly increase the pressure exerted on the aluminum pump housing. Believe me I have seen many pump housing burst from this kind of overload.

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BHFLA

03-09-2002 16:41:42




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 Re: 8N hydraulics - Pressure ? in reply to Tom_NC, 03-09-2002 12:25:42  
I replaced the relief valve on my 8n thru the inspection plate. I tried short wrenches, custom bent wrenches and other means, and never was able to get the valve out. I found the easiest way was to remove the pto shaft. Remove the four bolts holding it in and it comes right out. If your careful you might even salvage the gasket. If you have not changed your hydraulic fluid for some time you might want to follow Dell's advice and pull your pump. You can then clean the hydraulic cavity out. To do that you still have to pull your pto. Hope this helps.

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Dell (WA)

03-09-2002 13:13:23




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 Re: 8N hydraulics - Pressure ? in reply to Tom_NC, 03-09-2002 12:25:42  
Tom..... ..yes, you can replace the 8N's pressure relief valve with a customized and shortened handled and bent 11/16 wrench. (I think thats the size) through the 6" round access ports. But most people are not "that familiar" with the N's hydraulics so feel more comfortable dropping the hydraulic pump so they can see what they're doing.

How often do you go around lifting those big round bales? And how do you keep your front wheels onnna the ground? Most N's can only lift about 750-800 lbs before the front wheels are flappin' innna breeze..... ....Dell

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Tom_NC

03-09-2002 14:23:00




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 Re: Re: 8N hydraulics - Pressure ? in reply to Dell (WA), 03-09-2002 13:13:23  
Dell ..... These are 4 x 5 bales and bone dry, not sure what they actually weigh in at. The ones that it would get off the ground it did fine with, of course this was on level ground in a large storage shed, just shuffling them around to get at them with MF135 loader easier. I do have the front wheels filled with liquid and a heavy front bumper.
Thanks,
Tom



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