No power under load, but works fine with no load is usually a symptom of a bypassing motor. Easy to check. Pull the case drain( it will be the smallest of the hoses)have your friend hit the tram pedal and see how much oil comes out. A steady drip to a VERY weak stream(its hard to explain) is acceptable. If it pours your motor is bad(bypassing). If the motor doesn't have a case drain, you will have to check for heat. Tram enough to get the system warm. Compare your suspect motor to the good one. If its hot or quite a bit warmer your bypassing. If neither of these get you any where you may want to check pressures(may have compensator, or relief problems for that circuit) and flow. Remember just because you have pressure doesnt mean you have enough flow. If you dont have any gauges the simplest thing would be to swap motors from side to side. If the problem moves its the motor, if it doesnt your obviously looking at something upstream. Hope this helps.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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