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Re: A little help with 574 hydraulics

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01-29-2013 13:18:32

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Firstly, hydraulic test at remotes needs to be done at about 1500 engine rpm and should show 2500psi

Secondly on the slow lift, what happens if you pull an auxiliary valve lever onto demand whilst lifting ??

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JTM Nashville

01-29-2013 13:34:21

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 Re: A little help with 574 hydraulics in reply to Cyrush, 01-29-2013 13:18:32  
My test at the remotes was at about 1200 RPM. I'll have to reassemble the unloading/flow control to rerun the test.
Pulling the remote lever up during the slow-lift issue had no effect. I did try that.
And thank you for the questions.

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JTM Nashville

02-01-2013 15:21:02

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 Re: A little help with 574 hydraulics in reply to JTM Nashville, 01-29-2013 13:34:21  
Okay, I have exactly 2500 psi at the remotes both cold and warm. That pressure holds even down to around 1100 RPM. I did not try it at any lower RPM. The pressure does not change when the three point is lifting. Dead heading the remote has no effect on the three point trying to lift. I also removed the filter cover and installed a new gasket. The one that came out looked good, no twists or damage.
After all of this the symptoms remain the same.

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02-02-2013 05:36:08

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 Re: A little help with 574 hydraulics in reply to JTM Nashville, 02-01-2013 15:21:02  
O/k good pressures!!

The thing that afects speed of lift is flow??

You say its o/k with no load on the links but is slow when you try to lift a small load??

Did you have the draft control valve out?? And if so i suspect the adjustments for spool travel may not be correct!!

Also i presume you are lifting using only the position control lever( the inner one ) as when using the draft lever (outer one) the speed of lift is controlled by the raise responce valve setting (rear outer lever)" In position control a sliding link pulls the raise respoce rotary spool to fast when the position lever is raised to full lift!!

To give me an idea of time, how many seconds does it take from fully lowered to fully raised, with no load and with alight load???

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JTM Nashville

02-08-2013 14:36:17

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 Re: A little help with 574 hydraulics in reply to Cyrush, 02-02-2013 05:36:08  
Yes, I am using the position control with the draft all the way down (forward) and the raise response in the fast (all the way up) position. And yes, the position control does force the raise response to the fast position if it is not already there. I ran this by my local Case/IH dealer and the mechanic suggested measuring pressure at the unloading valve pressure input fitting. I did this and was able to read 2500 psi upon closing the restricter valve on my test setup. Also interesting is that while restricted, the three point lifted a 6.5 foot disk with no problem. Not sure if this is telling us anything of value or not.

With all lines connected normally and no three point load it will lift full height in about 3 to 4 seconds. With 200 lbs on the hitch it may not make the lift at all or at best it will take 20 seconds or so. This is with the engine at 1200 rpm.

The dealer mechanic is thinking the problem lies somewhere in the unloading valve assembly. Any thoughts?

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02-10-2013 06:04:40

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 Re: A little help with 574 hydraulics in reply to JTM Nashville, 02-08-2013 14:36:17  
The fault you have is not in the unloader & flow control valve as it is still there when u pull the aux valve lever to dead end the oil supply. At that point oil can only go 2 ways, to hitch cylinder to lift if draft valve is in lift mode , and to blow the main R/v and pass to return.

There is a problem with the linkages in the hydraulic top cover, it may be a circlip off or more likely the sensing beam and spring have become detached from their mounting pegs (hook end of spring may have broken off !! and as such the walking linkage has gone out of balance !!

To check, just rear of unloader &flow assy is a metal plate with the breather on it, remove this and you can see the linkage that operates the draft valve, operate the draft lever from full lower to full raise & back to lower again. (Engine stopped !!) and you should see the spring expand and contract. if it does then its a circlip issue, if it doesn't its a broken or detached spring.

Some skilled mechanics can replace spring through this plate but its very fiddly. Official way is hydraulic top off, replace, bleed brakes etc, allow about 12 hours labour.

I need your e mail so i can send document that shows the linkages!!

Also do you have a service manual ??

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JTM Nashville

02-11-2013 06:57:35

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 Re: A little help with 574 hydraulics in reply to Cvrush, 02-10-2013 06:04:40  
Just sent you my email address through this forum. I am using the I&T Shop Service manual which does show a good breakdown of the control linkages. I'll try the inspection you detailed sometime today.

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02-14-2013 06:10:39

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 Re: A little help with 574 hydraulics in reply to JTM Nashville, 02-11-2013 06:57:35  
Further to my last post !!!

Continue by staring the tractor and lifting 3 point hitch on the position control lever and gauge the amount of spool and lever movement!!

Then add your weight and lift again, comparing spool and lever travel (s) which should be the same!!

Do not!! At this time alter the spool adjustment and do not!! Attempt to adjust the drop check valve!!. The drop check appears to be correctly set !! The info from the I & T manuals on how these adjustments are done, appears strange ??? And not how we did them in the factory !!

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