MF 135 knocking sound under seat

[coppertop]

I'm not sure what the noise could be, when I press the clutch pedal down the noise stops.
Any help would be great.

Thanks.
Tim

 

[Brakeman]

It could be the relief valve on the hydraulic pump releasing the pressure. There are a few posts recently added that gives replies to this.
What is the position control lever position? Is it in the constant pumping position? Does your tractor have a diverter valve under the seat?

 

[murphy1244]

don't bring position control handle all the way back.

 

[murphy1244]

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