Posted by YesterdayRick on October 22, 2011 at 12:08:40 from (173.210.135.12):
I have an early 60s JD 4020. I recently changed out the hydraulic pump (driven off of front of motor; bought rebuilt pump with warranty $1200!!) and everything worked just fine last weekend. Today, pump sounds like it may be cavitating a bit when under load (i.e. makes a grattling sound when under load). I can raise the front end loader but it goes up really slow, seems the pump isn't pressuring up enough. Hydraulic oil level is topped right up and brakes, transmission, steering etc. work fine, changed hydraulic oil filters (2 filters as its a power shift transmission) prior to starting up after changing out pump, no leaks to speak of; basically everything works good except the pump makes a noise when under load that I don't recall hearing last weekend and front end loader doesn't work properly (neither smooth nor quick) both raising and tilting the bucket. Thought perhaps it may be sucking air? There is a cooler which I believe ties into the suction side of the pump via a ~1.25" rubber hose, tightened clamps up and doesn't appear to be leaking however may be very slight leak on cooler itself but its been there every since I bought the tractor. Any other ideas?
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