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Message: <blockquote data-quote="Earthwerks Unlimited" data-source="post: 26505" data-attributes="member: 1300">The side plates in the pump are what keeps pressure in the pump--pressure from the fluid presses against the gears as they rotate. If the pressure or sealing ability is lost as in this case due to catastrophic wear to the plastic plates due to sucking air (normally they're aluminum or thin steel) and what will happen is any fluid in the gear cavities will just be regurgitated--just like putting your head back and gargling. Until you swallow no pressure (to your stomach) is developed--but it makes a lot of noise.My concern is part number 12---that is "internally splined" ("slotted" is not the proper terminology---just edumacating ya when you call for parts ). Vibration from the engine combined or opposed to the vibration in pump system will destroy the splines---my former L555 with a Perkins did just that. I think it was an $85 part to replace it. Luckily the pump female splines weren't damaged. And my backhoe's spline did the same thing. It's an easy fix--it cost $175 for a hydraulics shop to remove the old spline and insert a new one. Also the rubber grommets at the flywheel (near no. 12) also wear out and increase vibration as there will be metal-against-metal tansferring the energy.</blockquote>