The front pump doesn't "draw" oil, it's fed a constant supply of oil by the clutch pump.
The excess flow of oil beyond what is needed to operate the clutch, PTO clutch or brake, and "2-speed" is routed up front to the oil cooler and the main pump along with "function return oil" from SCV's and hitch valve, etc.
If there's little or no demand on the front pump, the oil is cooled and piped back to the rear sump.
You really need to dig into the manual and rent, beg, or borrow a flowmeter, and start by checking the oil flow TO the front pump after it's warmed up.
If there's a leak in the main clutch system, PTO or PTO brake system, or the 2-speed a lot of the oil from the clutch pump that would be sent up front to the main pump is lost to sump as "clutch operating oil flow".
If the flow of oil up to the front pump meets "specs", then it's time to look at the main pump and high pressure hydraulic components.
Note that there's a pump in the rear half of the tractor, behind the transmission, but in this 4WD configuration it's used for lube, NOT for oil supply to the main pump.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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