Thats the sign of a weak pump but it usually takes awhile to slowly wear down. Air leaking past the pump shaft seal. May take a speedy sleeve to fix. A lot of times it the seal that goes from the pump to the transission allows air in. Many people run an extra 5 gal. of oil in the tranny to cover the seal. I have to and it doesn't hurt your tractor. Most likely something gumming up and blocking a valve or a popoff maybe has something stuck under the ball.
The settling down could be leaking pistons inside the cylinders maybe the valve spools sticking and not centering like they should. Does the steering work ok? Sometimes it is just a process of elimination and checking pressures and flows. Try some things and let us know. Someone with knowledge will come along and trump my post. good luck.I would rule out everything else before buying a new pump.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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