Randy,

 

My pump just started doing the same thing.  I capped off the pump to check if the issue was inside the pump or switch (teh switch is new and verified with gauges).  I found the O rings inside the adapter were hard and seemed worn.  I suspect fluid  is leaking across these O rings.  I decided to replace the entire adapter section and upgrade the pump section and sump at the same time

 

The reference below is from somebody else's post that I dug up on the internet a little while ago

 

Thanks

 

Tom

 

 

UPDATE 3-12-2008: I've now performed my 4th "Frankenpump" surgery on a Velocity this week. It seems this problem is becoming more common as these parts wear. I've also learned how to save a significant amount of money and still get the job completed. The trick is to order JUST the center "adapter" section of the pump. It's the casting and components that is in-between the electric motor and the sump, where the pressure lines attach. You can get them from just about any Parker dealer, but these guys usually have them in stock - Western Fluid Power, 2759 South 300 West, Suite H, Salt Lake City, Utah 84115. Talk to Boyd Ottenstein at 801-486-6500. You will need to order Part number 642283, listed as "Adapter", and it cost about $75. The VERY important part is that it have the "LB Circuit"! This is the type of internal shuttle that allows return fluid to be routed back to the sump - without it, your system will not work. It's also worth spending $20 more bucks and getting a new "Sump Kit" at the same time. That kit comes with new sump O-rings, pickup filters, sump return tube, new anti-seep filler cap, and the sump now mounts with screws from the top for a more positive (no leak) attachment. Once you have all the stuff, just take your pump apart and transfer the motor, pressure valves, impellor pump (needs a Torx socket), and new sump over to the new center section. That's it...put her back in, bleed the system, and all things should be right with the world again. Good luck!