Yes, try bleeding the pump
For all intents and purposes your 3500 is the same as a 3000 with the exception of the front axle, steering and hard nose.
Same engine, transmission, rear end, brakes, 3 point, etc. So do yourself a favor and get yourself a repair manual for it. It will explain how to bleed the pump (which is very easy) plus a lot of other stuff.
$30 - Cheap