Case 1370 clutch adjustment

Henrik Jansson · Apr 26, 2016

I have two Case 1370. Today I checked the linkage adjustment for the clutch pedal.
My shop manual says that the inching spool should bottom in the control valve.
On one of my tractors it did not bottomed all the way down. Can this make the clutches dont get enough hydraulic pressure so the clutch discs will wear out?

mEl · Apr 26, 2016

(reply to post at 11:56:08 04/26/16)

Henrik, The spool travel is critical as it controls both C2 and C4 clutches, with the pedal up the spool should be adjusted so the spool completely bottoms in the valve, on the other hand it should travel all the way out when the pedal is depressed, when so depressed C4 is engaged, ( The surge you hear when pushing the pedal clear down), if that is not happening the 4 speed transmission will be almost impossible to engage without grinding gears.

Check the pedal for stop bolts up under the dash, the one will limit the downward motion and should be adjusted so it stops the pedal just as the spool comes out against the valve body and stops. Early in the 70 series production many out stop screws were removed and left out so the spool could travel clear in by pedal return spring pressure. If the spool does not go clear into the body upon pedal release C2 clutch pressure can be affected and possible C2 slippage and damage could result.

Henrik Jansson · Apr 26, 2016

There is no problem to engage the C4. And the clutch pedal adjustment is as it should be, I think. But it seems to be some spring inside the big valve-box because if I press the inching spool down by hand to the bottom, it goes up alittle by it self, and that is not caused by the linkage, I know that because I removed a pin in the linkage.
The shop manual says that it should be no pressure on this pin, but it is, when the clutch pedal is up. So the linkage should be pressing the spool all the way down, but if I press on the spool it will go down 1-2 mm more, and when I stop pressing it goes upp 1-2 mm by it self.
Maybe the last "bellcrank" is not moving as easy as it should on its bolt.

If any cluthes are bad, should I find evidence for that in the filters?

Is there any way to know the status of the clutches without splitting the tractor?

Brokengun · Apr 26, 2016

you can determine the condition of the system by doing a pressure check.

Henrik Jansson · Apr 27, 2016

As I know a pressure check only shows the condition of the hydraulic system in the powershift, it can not show the condition of the clutch discs.

mEl · Apr 27, 2016

Henrik,

There is a modulating point and a pair of springs in the end of the spool causing up pressure that you describe, find out what is causing the slack that allows spool movement and adjust it so there is none.

Check if there is an upper stop bolt in the pedal adjust accordingly. the manual should not say the pin should be loose as the clutch return spring provides the force to keep the spool bottomed. If there is no upper stop bolt, adjust the linkage to get the spool bottomed then readjust the lower stop bolt at the pedal to get complete spool movement out when the clutch pedal is pressed.

It should not be to complicated to sort out after you look at it, whatever it takes to increase the amount of linkage travel then touching up the pedal stop bolt should do you. You seem to have a good grasp on things so good luck.

Henrik Jansson · Apr 27, 2016

Ok, thanks!
Should the spool be completely bottomed? If so, why is there a spring that press the spool up a little bit?
Now I have adjusted the linkage, so the spool is completely bottomed without slack. I hope that is right.

mEl · Apr 28, 2016

(quoted from post at 18:30:43 04/27/16) Ok, thanks!
Should the spool be completely bottomed? If so, why is there a spring that press the spool up a little bit?
Now I have adjusted the linkage, so the spool is completely bottomed without slack. I hope that is right.

The spring tension you feel pushing the spool back up is the modulation section of the C2 circuit, when the pedal is pushed down the spool is pulled out and there is no tension on the internal modulation circuit, as the spool moves in during clutch pedal action to start to move, the spool moves in and the modulating point with spring tension behind it serves as a variable rate relief valve to allow C2 pressure to rise gradually to apply C2 smoothly as a main clutch till at full spool travel the modulating portion of spool travel is taken out of the circuit.

The spring feel you had is normal but should be adjusted so it is no longer able to be felt, bottomed is the correct position for the clutch(inching )spool. Spool bottoming assures that full flow divider pressure--180-210 PSI is sent directly to the clutch VIA its pilot plunger.

Case 1370 clutch adjustment

Henrik Jansson

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mEl

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Henrik Jansson

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Brokengun

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Henrik Jansson

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mEl

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Henrik Jansson

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mEl

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