Nope, it won't hurt anything, except maybe the paint job when it overflows. You can have the reservoir full right to the brim if you want, just remember oil expands as it heats, and when it comes back in under pressure, it can splash.
What will hurt the pump is running the reservoir dry.
Loaders from the era have very long one-way cylinders that take more than 6 quarts too. The tops of the cylinders are used as supplemental reservoirs so when the loader goes up, they push more oil into the belly pump, and when the loader goes down, the full reservoir pushes oil back into the cylinders.
I thought the belly reservoir was pretty well full when the dipstick said full... Looks like a gallon tank would be more than enough as a catch tank, and would be very easy to hide under the gas tank.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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