31.88 Cubic Inch Motor

According to: https://www.surpluscenter.com/item.asp?item=9-7469&catname=

the working pressure is around 1,100 PSI.

Comment from MJ: When I bought this motor, years ago, I recall the rated pressure was around 3000 PSI. That is what I have at OSTrac. What is the discrepancy? Is that the reason for the Failing Wheel Couplers?