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Message: <blockquote data-quote="Tazza" data-source="post: 15870" data-attributes="member: 82">From that they believe the problem is your drive motor?Your control block is also leaking?Pulling the motor isn't that hard, it is fiddly but can be done. I was lucky and the seals were shredded but the backup rings were in good shape. $11 worth of seals either side fixed my problems.If it drives in one direction properly it really doesn't seem like a motor, if you look inside a motor you would understand. The mack section has your 2 high pressure inlets, these are separated by O tings and backup rings. If you blow a seal the high pressure will flow back to the low pressure side without doing any work. No matter if it is forward or reverse it will do the same.I would swap the hoses at the pump, top to bottom, bottom to top on the problem side see if the problem reverses its self. If it does, you have confirmed its in the pump, most probably the relief valve.</blockquote>