If the low side of the TA (mechanical sprag) is good the tractor should move with a good main clutch. The high side (clutch pack)can slip due to low pressure from a weak pump or a leak. The only simple solution would be if the dump valve or its linkage is binding. The dump valve is the one connected to the clutch linkage with the 1/4" x long rod. Unfortunately when what you"ve described happens it is due to leakage inside the TA unit. If your power steering is working OK then you probably need a TA replacement. Many times guys don"t realize their TA is "OUT" on the low side because they will move a light load but not a heavy one.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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