MF 135 hydraulics noise

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MF 135 hydraulics noise

Tim I have a 1965 MF 135. When ever I load the link arms, a knocking / rattle develops from the transmission case. At low weights it's quiet. The noise starts at about 600kg load (at the arm ends), well under the rated maximum. Does anyone have any ideas what this might be before I start dismantling things.
Geoff Hi Tim,..this is quite a common noise from MF hydraulics...9 times out of 10 there is nothing to worry about as it is caused by the drive gears to the hydraulic pump working under pressure when the hydraulic pump is under's known as Henderson Knock....occasionally a bush in the endplate of the hydraulic pump comes adrift or a pump support pin breaks...the choice is yours as to what path you want to take...if you need any more info you can contact me and I will see what I can do to help.....Regards....Geoff
Tim Thanks Geoff. That sounds like it. Can the support pins be checked without removing the pump, or will the pump drop slightly, making relocation of the pins difficult.
Geoff Hi Tim,....yes the pins can be checked one at a time....the pump is also supported by the PTO shaft front and behind the pump....remove the pins separately and check them then refit may find when you try to get them back in again things are a bit tight....loosen the PTO shaft a bit and you will have a bit of play......Regards..Geoff
Tim Geoff,
Thanks for your help.

Doon Hi, i have the same problem on my 35 but then all of a sudden something let go and now there is a very loud knock with the clutch out, but quiet when depressed. any ideas? Cheers.

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