Knocking noise from 3pt hydraulic lift pump

My newly acquired MF 135 has just gone through the haying season. It performed very well at mowing and raking. The only problem I noticed was that when I mounted the rake to the 3pt hitch, initially it had trouble raising it up to transport position. When it finally did lift it there was a noticeable knock coming from the hydraulic lift pump.

The knock only seems to be noticeable when the inner quadrant lever is in the transport position. The Draft Control lever was in the fully raised position as suggested in the owner's manual.

Is there a maximum weight that the lift pump can handle on the 3pt hitch?

Does the knocking noise signify a potential problem with the hydraulic lift pump? What would account for the knocking noise?

Thanks,
Richard

If your hyd system is "presssure control" type
and the inner lever is at constant pumping position the releif valve will open and close rapidly.

The pressure control hyd system controls operates diffently than the conventional. You may check in your operator manual.

My 2�

Joe Ferguson

With regard to ther pump knocking,make sure you have the right oil so that it's not foaming and make sure that the quadrant is adjusted properly to make sure that the pump isn't starving for oil. If you have an old type cam pump, the cams maybe worn.

I actually have an original operator's manual for the MF 135 (UK version), but it doesn't mention anything abut the maximum weight for the 3pt hitch.

How would I make sure that the quadrant is adjusted properly?

Thanks,
Richard