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things that make you scratch your head.....

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steve19438

06-05-2018 09:55:06




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bought this 56 35 in 2014. in 2015 my SIL and me removed the hyd pump and rebuilt the oscillator assembly. yesterday I was poking around and noticed this crack. Never saw it before. did it happen on my watch? I used a torque wrench to tighten the top cover bolts.




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John Deere D

06-05-2018 23:39:11




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 Re: things that make you scratch your head..... in reply to steve19438, 06-05-2018 09:55:06  

Pictures from "YT" archives..........Tractor had not ran for several years.......:

Owner fired it up with little concern or knowledge of the Hydraulic lift.....

Could happen to any of us.............

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John Deere D

06-05-2018 19:47:22




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 Re: things that make you scratch your head..... in reply to steve19438, 06-05-2018 09:55:06  

I always install a gauge as per picture:
Ensure side inspection plate is removed:
With fuel OFF, Ignition OFF, Transmission in Neutral, wheels blocked...
View HYD. PUMP control with inspection plate is removed:

Hyd. Control in UP / Lift position:
Crank Engine on Starter:

Watch GAUGE for any signs of Relief Valve reliving, OR NOT relieving:
If Gauge indicates a SHARP SPIKE in PSI( STOP CRANKING ENGINE), starter starts to pull down....you have a PROBLEM:

Bob...MF FE 35 X...TEA-20 Ferguson...

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Dan S (NY)

06-05-2018 10:16:55




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 Re: things that make you scratch your head..... in reply to steve19438, 06-05-2018 09:55:06  
When the 3pt arms are all the way up, do they still have a bit of free play or are they going all the way up and the relief valve is blowing off all the time? That can create a lot of stress on the top cover.



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steve19438

06-05-2018 11:48:31




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 Re: things that make you scratch your head..... in reply to Dan S (NY), 06-05-2018 10:16:55  
will have to check that next time I have it running. I do know that I moved the quadrant lever stop down a bit when I got it home.



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Steve@Advance

06-05-2018 16:05:49




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 Re: things that make you scratch your head..... in reply to steve19438, 06-05-2018 11:48:31  
Dan S is right, that is caused from the hyd controls not being adjusted properly.

Once the arms are near the top, the control should stop the pressure to the cylinder. There is a procedure in the shop manual, too difficult to describe without pictures.

There are also 2 different relief valves. Prior to 168853 uses a 2000 PSI, after uses a 2500.

As long as nothing is leaking, and the hydraulics are adjusted, the crack probably won't get worse unless you do a lot of heavy and bouncing lifting.

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William Fissell

06-07-2018 10:10:44




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 Re: things that make you scratch your head..... in reply to Steve@Advance, 06-05-2018 16:05:49  
My to-30 has the same crack but the hyds have never been actuated and may not even be in there as there is a backhoe secure to the rockshaft. pretty sure came form factory w hoe installed.



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