change the barrels and the plungers, recalibrate the pump and you'll want a differently profiled torque cam if you want to make the nicest use of the delivery.
if you can get the numbers off of the pump frame that has the plungers you want give raoul at HIM in campbellfield vic a call.
but the pump from a 4be1-t or 4bg1-t would be a good start and probably easier to get than just the plungers,
the 4bg1-t series is fitted to the yy04 sk135 (and other models of similar size/era) and later kobelco excavators, the hitachi 130x and a couple of others as well as some mediumly large forklifts.
ring a plant wreckers.
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