Charge pressure warning

Is ir normal when operating my 543B at quarter throttle around the yard pushing dirt or rocks for the charge pressure light to flicker momentarily when switching from foward to reverse or when moving foward and pushing into something solid were it slows the progress of the machine momentarily but doesnt stall the engine only bogs it down slightly or is my charge pressure on the low side possibly triggering the warning for a brief second. Or am I incorrectly operating the machine not having the rpms in the upper range.

You need to run the engine at the least 3/4 throttle. You may damage to the hydrostatic pumps running them too slow. If the governor on the engine is set correctly running at full throttle won't hurt anything.