That very small line in you picture goes to the left side cover and has a tap for a gauge connection. Oil pressure should be around 125-150 psi with the lever in the forward position. The pump is driven full time by a shaft from the spline in the clutch pressure plate. "New Pump" you say, I ran mine with the lift cover off (at idle) to observe the operation of the IPTO clutch and brake. The brake will NOT stop the PTO with a load IE; Brush Cutter. It is just to hold the shaft from turning in the off position.
As to the main pump hydraulics, I notice you have a valve mounted on the lift cover (forward, right side). Could it possibly be shifted into the diverted position to supply oil to aux equipment? If so, the lift arms will not work in that position. In the picture I posted, mine has a simple diverter valve supplying oil to the four way valve. Yours looks to be all in one valve.
There are many folks here that have more knowledge than I. I do hope they chime in.
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