IIRC, there were two companies that made pumps for these, Thompson was one, don't recall the other.
The plate you reference was called a "front plate" by Cessna/Eaton (where I worked for 38 years), but don't know what the IH pump manufacturers called them. Generally what goes wrong is the seal is bad in the front plate and a groove gets worn in the shaft. A new seal and "speedy sleeve" from most industrial supply places, like IBT, will fix that problem. If the bushing is worn in the front plate, you may need to take it to a hydraulic repair shop and have them replace the bushing. If the gear pocket is worn or grooved, it depends on how bad it is. Bad enough and you will be better off trying to find a better used pump either for use as it is or for rebuilding.
BTW, I'm beginning to think mine is bad in my 240U also... if it is, I'll take it off and take it to B&B Hydraulics locally where there are some old Cessna/Eaton hands working.
This post was edited by IH fan at 13:41:09 01/31/15.
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