My JD 310 SE extend a hoe retracts fine but doesn't extend well. Low power and very slow. You can hear hissing from the control valve as if you are slightly moving the control. I checked for proper linkage travel and it is fine. If I hold the lever for the main arm in the lowering position while I extend the hoe it works fine (hoses must be fine). Any one have and insight? Thanks for the help.
Alan
Alan