Hamm 3410 roller need help with oil pressure warning light

[omega 1]

I have a Hamm roller tier 2 deutz 2012 motor it keeps sounding the oil pressure alarm on start up i have checked all sensor but still sounding alarm.
Has anybody had this problem.......

 

[orkrule1]

I'd check the oil pump, and make sure there's plenty of oil in the tank.
if that doesn't work maybe try a different viscosity of oil?